The Doctor is the protagonist of the long-running BBC science fiction television series Doctor Who . An extraterrestrial Time Lord , the Doctor travels the universe in a time travelling spaceship called the TARDIS , often with companions . Since the show's inception in 1963, the character has been portrayed by fourteen lead actors . The transition to each succeeding actor is explained within the show's narrative through the plot device of regeneration , a biological function of Time Lords that allows a change of cellular structure and appearance with recovery following a mortal injury.
207-722: Madame Vastra , Jenny Flint , and Strax (informally known as the Paternoster Gang , together with the Doctor ) are a trio of recurring fictional characters in the British science fiction television series Doctor Who , created by Steven Moffat and portrayed, respectively, by Neve McIntosh , Catrin Stewart , and Dan Starkey . The three characters first appear in the sixth series episode " A Good Man Goes to War ." Madame Vastra (a Silurian ) and Jenny Flint (a human) are
414-586: A married couple . In later stories, they are depicted living on Paternoster Row in London during the Victorian era . Strax, a Sontaran , is seen in his first appearance to be acting as a nurse , caring for wounded soldiers on another planet as penance for a failure. They are all recruited by the Eleventh Doctor to help him rescue Amy Pond . Despite the success of the effort, Strax apparently dies in
621-586: A scientist or an engineer . However, he does occasionally show medical knowledge and has stated on separate occasions that he studied under Joseph Lister and Joseph Bell . In The Moonbase (1967), the Second Doctor mentions that he studied for a medical degree in Glasgow during the 19th century. The Fourth Doctor was awarded an honorary degree from St. Cedd's College, Cambridge, in 1960. He has been mocked by his fellow Time Lords for adhering to such
828-420: A statistical law, so decreasing entropy and non-increasing entropy are not impossible, just improbable. Additionally, entropy statistically increases in systems which are isolated, so non-isolated systems, such as an object, that interact with the outside world, can become less worn and decrease in entropy, and it's possible for an object whose world-line forms a closed loop to be always in the same condition in
1035-608: A "doctor of time travel". The revived programme establishes that Time Lords invent their own names. In " The Sound of Drums " (2007), the Tenth Doctor remarks to the Master that they both chose their names, with the Master calling him sanctimonious for identifying himself as "the man who makes people better". The Eleventh Doctor , in " The Name of the Doctor ", elaborates that the name is a promise to be: "Never cruel or cowardly. Never giving up and never giving in." This statement
1242-631: A "lowly" title as "Doctor", although in The Armageddon Factor (1979), Drax congratulates him on achieving his doctorate, indicating it was at least a somewhat respectable title. In " The Girl in the Fireplace " (2006), he draws an analogy between the title and Madame de Pompadour 's. In The Mutants (1972), an official asks the Third Doctor if he is, in fact, a doctor, to which the Doctor replies "I am, yes"; when asked what he
1449-682: A "time splinter" of future companion Clara Oswald using the name Oswin wipes all knowledge of the Doctor from the Daleks' collective memory. This knowledge is regained when the Daleks conquer the Church of the Silence in " The Time of the Doctor " (2013). The Doctor is not present on Solomon's database in " Dinosaurs on a Spaceship " and holds a conversation about his newfound anonymity in " The Angels Take Manhattan " with River Song. In " Nightmare in Silver ",
1656-471: A PhD in cheesemaking (" The God Complex "). In the first episode, the Doctor's granddaughter Susan goes by the surname "Foreman", and the junkyard in which Barbara and Ian find him bears the sign "I.M. Foreman". When addressed by Ian with this name, the Doctor responds, "Eh? Doctor who? What's he talking about?" Ian realises that "Foreman" is not the Doctor's name, when Barbara addresses the Doctor as "Doctor Foreman"; Ian asks Barbara, "That's not his name. Who
1863-670: A Time ", it is revealed that the Doctor also left to investigate the mystery of why good prevails in a universe where evil would seem to have so many advantages. It would be after his encounter with the Twelfth Doctor that the First Doctor realised that his actions made the difference in the balance between good and evil, with the Twelfth Doctor stating "The universe generally fails to be a fairy tale, but that's where we come in." In other media, more has been revealed of
2070-541: A Time Lord lady named Patience who was the widow of Omega , one of the founding-fathers of Gallifreyan society who fell into an anti-matter universe. Patience later met and married the Doctor and together they had thirteen children. Once their first-born son announced the arrival of a baby, the family was targeted by the Lord President, as the child was to be conceived naturally and only the Loom-born could inherit
2277-571: A brother in " Smith and Jones ", and sisters in " Arachnids in the UK ". In " It Takes You Away ", the Thirteenth Doctor claims that she had seven grandmothers. Later in the same scene, she mentions that her favourite grandmother, Granny 5, alleged Granny 2 was "a secret agent for the Zygons ". Throughout the revival, the Doctor routinely attempts to change the topic when questioned about being
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#17327838363682484-530: A character skipping forward in time. In Hindu mythology, the Vishnu Purana mentions the story of King Raivata Kakudmi , who travels to heaven to meet the creator Brahma and is surprised to learn when he returns to Earth that many ages have passed. The Buddhist Pāli Canon mentions the relativity of time. The Payasi Sutta tells of one of the Buddha 's chief disciples, Kumara Kassapa , who explains to
2691-644: A cylinder is infinitely long and spins fast enough about its long axis, then a spaceship flying around the cylinder on a spiral path could travel back in time (or forward, depending on the direction of its spiral). However, the density and speed required is so great that ordinary matter is not strong enough to construct it. Physicist Ronald Mallett is attempting to recreate the conditions of a rotating black hole with ring lasers, in order to bend spacetime and allow for time travel. A more fundamental objection to time travel schemes based on rotating cylinders or cosmic strings has been put forward by Stephen Hawking, who proved
2898-471: A definitive judgment on the issue without a theory of quantum gravity to join quantum mechanics and general relativity into a completely unified theory. The theory of general relativity describes the universe under a system of field equations that determine the metric , or distance function, of spacetime. There exist exact solutions to these equations that include closed time-like curves , which are world lines that intersect themselves; some point in
3105-431: A demon in the 13th century, the residents of a convent called the Doctor the "sainted physician". This was proposed by Moffat on Usenet 16 years before "A Good Man Goes to War": Here's a particularly stupid theory. If we take "The Doctor" to be the Doctor's name — even if it is in the form of a title no doubt meaning something deep and Gallifreyan — perhaps our earthly use of the word "doctor" meaning healer or wise man
3312-501: A different universe than the one they came from; it's been argued that since the traveler arrives in a different universe's history and not their own history, this is not "genuine" time travel. The accepted many-worlds interpretation suggests that all possible quantum events can occur in mutually exclusive histories. However, some variations allow different universes to interact. This concept is most often used in science-fiction, but some physicists such as David Deutsch have suggested that
3519-608: A dissident Time Lady, who opposed the Time Lord High Council's plan to escape the Time War. When she reveals her face to the Doctor, his reaction indicates that he recognises her. Julie Gardner, in the episode's commentary, states that while some have speculated that the Time Lady is the Doctor's mother, neither she nor Russell T. Davies is willing to comment on her identity. When later asked by Wilfred who she was,
3726-620: A female Silurian warrior from Mesozoic Earth who was awakened from hibernation in the Victorian era when her lair was disturbed during the construction of the London Underground . Initially enraged, she attempted to avenge her sisters on perfectly innocent tunnel diggers before being pacified by the Doctor . She eventually overcomes her race's general prejudice of humans and joins London society. She becomes private detective , consulting to Scotland Yard , and likely inspiring
3933-420: A few milliseconds compared to another body is not feasible with current technology. As for backward time travel, it is possible to find solutions in general relativity that allow for it, such as a rotating black hole . Traveling to an arbitrary point in spacetime has very limited support in theoretical physics , and is usually connected only with quantum mechanics or wormholes . Some ancient myths depict
4140-452: A finite cylinder might produce closed timelike curves if the rotation rate were fast enough, he did not prove this. But Hawking points out that because of his theorem, "it can't be done with positive energy density everywhere! I can prove that to build a finite time machine, you need negative energy." This result comes from Hawking's 1992 paper on the chronology protection conjecture , which Hawking states as "The laws of physics do not allow
4347-465: A fixed number of twelve regenerations, meaning that every Time Lord had a total of thirteen incarnations including the original. The plot of " The Time of the Doctor " involves the Doctor receiving a new cycle of regenerations from the Time Lords before his expected demise, triggering the regeneration into the Twelfth Doctor , played by Peter Capaldi . The origins of the programme were explored in
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#17327838363684554-579: A former classmate of his named Drax. Drax calls the Doctor "Theta Sigma", or "Thete" for short, an alias which is clarified as being the Doctor's nickname at the Prydon Academy on Gallifrey in The Happiness Patrol and is mentioned again in the 2010 episode " The Pandorica Opens ". In the 2015 episode " The Zygon Inversion ", The Doctor tells Osgood that his first name is "Basil". Doctor Who spin-off media have suggested that
4761-406: A glance into the eyes to put the subject under a trance. The Doctor can read an entire book cover to cover in a second by thumb-flipping the pages before his eyes ( City of Death , " Rose ", " The Time of Angels "). Though medical skills he shows early in the programme are rudimentary, by Remembrance of the Daleks he can perform sophisticated medical diagnoses merely by touching someone's ear. He
4968-481: A good thing to have on screens at tea time." The Doctor (Doctor Who) A number of other actors have played the character in stage and audio plays, as well as in various film and television productions. The Doctor has also been featured in films and a vast range of spin-off novels, audio dramas and comic strips. Ncuti Gatwa has portrayed the Fifteenth Doctor since " The Giggle " (2023). Within
5175-468: A joke. Due to the retroactive creation of a numberless War Doctor and the Tenth Doctor's aborted regeneration in " The Stolen Earth "/" Journey's End ", the Eleventh Doctor was the final incarnation in his natural cycle. The Time Lords used a crack in the universe to give him a new cycle consisting of an unknown number of regenerations in " The Time of the Doctor ", triggering the regeneration into
5382-438: A large gravity well such as a black hole . A time machine that utilizes this principle might be, for instance, a spherical shell with a diameter of five meters and the mass of Jupiter . A person at its center will travel forward in time at a rate four times slower than that of distant observers. Squeezing the mass of a large planet into such a small structure is not expected to be within humanity's technological capabilities in
5589-522: A last resort. According to the alien villain Chedaki in the episode The Android Invasion , "his entire history is one of opposition to conquest". As a time traveller, the Doctor has been present at, or directly involved in, countless major historical events on the planet Earth and elsewhere – sometimes more than once. In the 2005 series premiere, " Rose ", it is revealed that the Ninth Doctor
5796-554: A man picking fruit from a fully mature carob tree. Asked whether he had planted it, the man replied that he had not, but that his grandfather had planted it for him. In Christian tradition, there is a similar, story of "the Seven Sleepers of Ephesus ", which recounts a group of early Christians who hid in a cave circa 250 AD, to escape the persecution of Christians during the reign of the Roman emperor Decius . They fell into
6003-441: A miracle-working sage of the 1st century BC, who was a historical character to whom various myths were attached. While traveling one day, Honi saw a man planting a carob tree and asked him about it. The man explained that the tree would take 70 years to bear fruit, and that he was planting it not for himself but for the generations to follow him. Later that day, Honi sat down to rest but fell asleep for 70 years; when he awoke, he saw
6210-414: A mole between his shoulders and was older than he was. Time travel themes in science fiction and the media can be grouped into three categories: immutable timeline; mutable timeline; and alternate histories, as in the interacting- many-worlds interpretation . The non-scientific term 'timeline' is often used to refer to all physical events in history, so that where events are changed, the time traveler
6417-505: A new body. It is stated in The Deadly Assassin that Time Lords can only regenerate a total of twelve times, giving a theoretical final total of thirteen incarnations. However, The Doctor has a natural ability to regenerate an infinite number of times. It is possible to exceed this limit: in "The Five Doctors" the Time Lords offer the Master, who is inhabiting a Trakenite body after exhausting his original twelve regenerations,
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6624-484: A new direction for the series. Cartmel wished to restore the character's "awe, mystery and strength" and make him "once again more than a mere chump of a Time Lord" – an idea the media dubbed the " Cartmel Masterplan ". Under Cartmel, the show foreshadowed this concept; however, its 1989 cancellation meant that it was never realised onscreen. The proposed backstory was fully explored in Platt's 1997 novel Lungbarrow , where
6831-481: A new regeneration cycle as a reward for his help and cooperation, and at some point, during the Time War they resurrected him, with his new body having at least one regeneration of its own. Regeneration is apparently optional, as in " Last of the Time Lords " the Master refuses to regenerate despite the Tenth Doctor's pleading. In addition, there are ways of killing a Time Lord that do not permit regeneration; for example, more than once it has been implied that stopping both
7038-415: A pair of prisms that had been moved up to 3 ft (0.91 m) apart, using a phenomenon known as quantum tunneling . Nimtz told New Scientist magazine: "For the time being, this is the only violation of special relativity that I know of." However, other physicists say that this phenomenon does not allow information to be transmitted faster than light. Aephraim M. Steinberg , a quantum optics expert at
7245-408: A parent or his family life, as in " Fear Her ", " The Beast Below " and " A Good Man Goes to War ". In " The Empty Child ", a hospital doctor named Dr. Constantine says to him, "Before this war began, I was a father and a grandfather. Now I'm neither. But I'm still a doctor." The Ninth Doctor 's reply is, "Yeah. I know the feeling." In " The Doctor's Daughter ", when discussing the topic of parenthood,
7452-559: A police box. The details of their life were also redacted from the Matrix – only snippets remaining, masked as the story of the Irish Garda Brendan. The true origins of the Time Lords remained hidden from themselves and from the Doctor. The First Doctor's subsequent childhood on Gallifrey has been little described in the series. In " Hell Bent " the Doctor recalled his origins as a high-born Gallifreyan. In The Time Monster ,
7659-459: A region of spacetime that is warped a certain way, and hence time travelers would not be able to travel back to earlier regions in spacetime, before this region existed. Stephen Hawking stated that this would explain why the world has not already been overrun by "tourists from the future". Several experiments have been carried out to try to entice future humans, who might invent time travel technology, to come back and demonstrate it to people of
7866-510: A repair shop on Gallifrey. In later episodes, the Doctor mentions that he once took a driving test to pilot a TARDIS and failed, and that he threw the instruction manual in a supernova because he disagreed with it. In " The Doctor's Wife ", Idris (the TARDIS's living soul in a human body) mentions that the Doctor had been travelling with her for 700 years, which indicates that he would have been 200 years old when he first borrowed her. In " Twice Upon
8073-454: A scientific basis for the possibility of backward time travel in certain unusual scenarios, although arguments from semiclassical gravity suggest that when quantum effects are incorporated into general relativity, these loopholes may be closed. These semiclassical arguments led Stephen Hawking to formulate the chronology protection conjecture , suggesting that the fundamental laws of nature prevent time travel, but physicists cannot come to
8280-403: A signal, some form of classical communication must also be used. The no-communication theorem also gives a general proof that quantum entanglement cannot be used to transmit information faster than classical signals. A variation of Hugh Everett 's many-worlds interpretation (MWI) of quantum mechanics provides a resolution to the grandfather paradox that involves the time traveler arriving in
8487-554: A sleep and woke some 200 years later during the reign of Theodosius II , to discover that the Empire had become Christian. This Christian story is recounted by Islam and appears in a Sura of the Quran , Sura Al-Kahf . The version recalls a group of young monotheists escaping from persecution within a cave and emerging hundreds of years later. This narrative describes divine protection and time suspension. Another similar story in
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8694-410: A small amount of proper time passes for them, while a large amount of proper time passes elsewhere. This can be achieved by traveling at relativistic speeds or through the effects of gravity . For two identical clocks moving relative to each other without accelerating, each clock measures the other to be ticking slower. This is possible due to the relativity of simultaneity . However, the symmetry
8901-540: A spy named Vansell, Millennia, Rallon and Jelpax. With this group, he learns about the Celestial Toymaker and travels to his realm in a type 18 TARDIS with Deca members Rallon and Millennia, who are killed. This leads to the Doctor's expulsion from the academy, condemned to five hundred years in Records and Traffic Control. In The Quantum Archangel , it is revealed the Doctor studied cosmic science alongside
9108-545: A strange old man and hear Susan's voice coming from inside what appears to be a police box. Pushing their way inside, the two find that the exterior is camouflage for the dimensionally transcendental interior of the TARDIS . The old man, whom Susan calls "Grandfather", kidnaps Barbara and Ian to prevent them from telling anyone about the existence of the TARDIS, taking them on an adventure in time and space. The first Doctor, says cultural scholar John Paul Green, "explicitly positioned
9315-490: A super-human level of stamina and the ability to absorb, withstand and expel large amounts of certain types of radiation (the Tenth Doctor stated they used to play with Röntgen bricks in the nursery, after absorbing the radiation from an x-ray of significantly magnified power). This ability would seem to have limitations which have yet to be fully explained, as the Doctor is harmed by radiation in The Daleks , Planet of
9522-464: A suspect community called Sweetville, led by Mrs Gillyflower. She finds the Eleventh Doctor, kept prisoner in Sweetville, and the trio reunites to help him defeat Mrs Gillyflower, by sabotaging the rocket she was planning to use to poison the skies. They discover that Clara appears to be alive (the Doctor's companion being another version of the one seen in "The Snowmen", coming from another era), but
9729-499: A symmetric polygon could still act as a time machine, although he concludes that this is more likely a flaw in classical quantum gravity theory rather than proof that causality violation is possible. Another approach involves a dense spinning cylinder usually referred to as a Tipler cylinder , a GR solution discovered by Willem Jacob van Stockum in 1936 and Kornel Lanczos in 1924, but not recognized as allowing closed timelike curves until an analysis by Frank Tipler in 1974. If
9936-565: A temporary member of the Paternoster Gang, working with them in an effort to locate the Doctor and investigate the dinosaur's death. Together, they find a message in a newspaper directed at Clara, leading to her reunion with the Doctor. The Doctor and Clara go searching for the culprit; when they are about to be killed by robots, the Paternoster Gang rescue them, fighting along with Clara until the Doctor defeats their leader, leading all robots to be deactivated and saving his friends. After
10143-470: A theorem showing that according to general relativity it is impossible to build a time machine of a special type (a "time machine with the compactly generated Cauchy horizon") in a region where the weak energy condition is satisfied, meaning that the region contains no matter with negative energy density ( exotic matter ). Solutions such as Tipler's assume cylinders of infinite length, which are easier to analyze mathematically, and although Tipler suggested that
10350-557: A time traveler should end up in a different history than the one he started from. On the other hand, Stephen Hawking has argued that even if the MWI is correct, we should expect each time traveler to experience a single self-consistent history, so that time travelers remain within their own world rather than traveling to a different one. The physicist Allen Everett argued that Deutsch's approach "involves modifying fundamental principles of quantum mechanics; it certainly goes beyond simply adopting
10557-427: A traversable wormhole would require the existence of a substance with negative energy , often referred to as " exotic matter ". More technically, the wormhole spacetime requires a distribution of energy that violates various energy conditions , such as the null energy condition along with the weak, strong, and dominant energy conditions. However, it is known that quantum effects can lead to small measurable violations of
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#173278383636810764-416: A vacuum. His experiment involved slow light as well as passing light through a vacuum. He generated two single photons , passing one through rubidium atoms that had been cooled with a laser (thus slowing the light) and passing one through a vacuum. Both times, apparently, the precursors preceded the photons' main bodies, and the precursor traveled at c in a vacuum. According to Du, this implies that there
10971-503: A weapon at him and it glows, but Strax disappears suddenly, leaving Vastra bewildered and calling his name. After Clara enters the timestream to save the Doctor and undo the Great Intelligence's changes to history, Jenny and Strax are restored. In " Deep Breath ", the first episode of the eighth series , Vastra, Jenny, and Strax arrive in central London to witness a dinosaur marching through the city and proceeding to cough up
11178-499: A webcast set two days after the events of "A Good Man Goes to War", Strax is awakened by Vastra and Jenny, after they heal his wounds, and accepts their proposition to join them in London in 1888. He subsequently becomes their butler. They then appear in " The Snowmen " (2012), trying to convince the Eleventh Doctor to come out of retirement (into which he has retreated after losing Amy and Rory in " The Angels Take Manhattan "). They help
11385-478: A wormhole with such an induced clock difference could not be brought together without inducing quantum field and gravitational effects that would either make the wormhole collapse or the two mouths repel each other. Because of this, the two mouths could not be brought close enough for causality violation to take place. However, in a 1997 paper, Visser hypothesized that a complex " Roman ring " (named after Tom Roman) configuration of an N number of wormholes arranged in
11592-410: Is an excellent cricket player ( Black Orchid ) and in " The Lodger " he proves to be a prodigiously talented footballer despite unfamiliarity with some of the game's basic rules. Though reluctant to engage in combat against living opponents, this is not for lack of skill; the Doctor is conversant with both real and fictitious styles of unarmed combat (most obviously the "Venusian Aikido" practised by
11799-452: Is broken if one clock accelerates, allowing for less proper time to pass for one clock than the other. The twin paradox describes this: one twin remains on Earth, while the other undergoes acceleration to relativistic speed as they travel into space, turn around, and travel back to Earth; the traveling twin ages less than the twin who stayed on Earth, because of the time dilation experienced during their acceleration. General relativity treats
12006-449: Is described as creating a new timeline. Early science fiction stories feature characters who sleep for years and awaken in a changed society, or are transported to the past through supernatural means. Among them L'An 2440, rêve s'il en fût jamais ( The Year 2440: A Dream If Ever There Was One , 1770) by Louis-Sébastien Mercier , Rip Van Winkle (1819) by Washington Irving , Looking Backward (1888) by Edward Bellamy , and When
12213-404: Is direct result of the Doctor's multiple interventions in our history as a healer and wise man. In other words, we got it from him. This is a very silly idea and I'm consequently rather proud of it. The anonymity of the Doctor is the theme of series 7 of the revived programme. After faking his death, the Doctor erases himself from the various databases of the universe. In " Asylum of the Daleks ",
12420-657: Is disintegrated and later woven into the Doctor. The Timeless Child reveal partly took inspiration from this. The Doctor's adoptive mother Tecteun was a native to Gallifrey and an explorer of the Shobogans. She adopted the Doctor when she was the timeless child. She led the Division ;after the destruction of Gallifrey by the Spy Master. She was involved in the creation of the Flux ;and
12627-454: Is disputed. Presentism is a school of philosophy that holds that the future and the past exist only as changes that occurred or will occur to the present, and they have no real existence of their own. In this view, time travel is impossible because there is no future or past to travel to. Keller and Nelson have argued that even if past and future objects do not exist, there can still be definite truths about past and future events, and thus it
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#173278383636812834-444: Is he? Doctor who?" In an ultimately unused idea from documents written at the programme's inception, Barbara and Ian would have subsequently referred to the Doctor as "Doctor Who", given their not knowing his name. Throughout both the classic and revived programme, a running joke is that when the Doctor is introduced as just the Doctor, characters reply "Doctor who?" Another variation is "Doctor what?" The story arc running throughout
13041-501: Is highly unlikely to be possible. Any theory that would allow time travel would introduce potential problems of causality . The classic example of a problem involving causality is the " grandfather paradox ," which postulates travelling to the past and intervening in the conception of one's ancestors (causing the death of an ancestor before conception being frequently cited). Some physicists, such as Novikov and Deutsch, suggested that these sorts of temporal paradoxes can be avoided through
13248-447: Is impossible for the time traveler to "change" history in any way. The time traveler's actions may be the cause of events in their own past though, which leads to the potential for circular causation , sometimes called a predestination paradox, ontological paradox, or bootstrap paradox. The term bootstrap paradox was popularized by Robert A. Heinlein 's story " By His Bootstraps ". The Novikov self-consistency principle proposes that
13455-457: Is known of the Doctor: not even his name, the actual form of which remains a mystery. In the first serial, An Unearthly Child , two teachers from Coal Hill School in London, Barbara Wright and Ian Chesterton , become intrigued by one of their pupils, Susan Foreman , who exhibits high intelligence and unusually advanced knowledge. Trailing her to a junkyard at 76 Totter's Lane, they encounter
13662-453: Is nearly 12, suggesting that this is quite old for a Sontaran. Running jokes include Strax's inability to tell the difference between genders and his obsession with using violent tactics. In their first appearance in "A Good Man Goes to War", the three, along with others who owe him favours, are chosen by the Eleventh Doctor to help him save Amy Pond from Madame Kovarian and the Order of
13869-521: Is no longer [the Virgin Queen]...". The joke continues in " The Beast Below ", featuring future British monarch Queen Elizabeth X or Liz Ten, and the marriage is finally shown in "The Day of the Doctor" during an adventure with Zygons . In the 2010 Christmas special, " A Christmas Carol ", the Eleventh Doctor accidentally marries Marilyn Monroe but later questions the authenticity of the chapel in which they were married. Steven Moffat did not consider
14076-516: Is no possibility of light traveling faster than c and, thus, no possibility of violating causality. Many have argued that the absence of time travelers from the future demonstrates that such technology will never be developed, suggesting that it is impossible. This is analogous to the Fermi paradox related to the absence of evidence of extraterrestrial life. As the absence of extraterrestrial visitors does not categorically prove they do not exist, so
14283-429: Is observed when one correlates measurements of idler photons to the corresponding signal photons. However, since interference can be observed only after the idler photons are measured and they are correlated with the signal photons, there is no way for experimenters to tell what choice will be made in advance just by looking at the signal photons, only by gathering classical information from the entire system; thus causality
14490-435: Is only honorary; the Tenth Doctor, however, considers the name to be his legitimate academic rank in " The Waters of Mars " (2009), describing his "name, rank and intention" as "The Doctor; doctor; fun." In an interview with The Age in 2003, Tom Baker mentioned that the Doctor is called so because he is "a doctor of time and relative dimension in space". Apart from being called a doctor of the TARDIS, he has been described as
14697-434: Is possible that a future truth about a time traveler deciding to travel back to the present date could explain the time traveler's actual appearance in the present; these views are contested by some authors. A common objection to the idea of traveling back in time is put forth in the grandfather paradox or the argument of auto-infanticide. If one were able to go back in time, inconsistencies and contradictions would ensue if
14904-488: Is preserved. The experiment of Lijun Wang might also show causality violation since it made it possible to send packages of waves through a bulb of caesium gas in such a way that the package appeared to exit the bulb 62 nanoseconds before its entry, but a wave package is not a single well-defined object but rather a sum of multiple waves of different frequencies (see Fourier analysis ), and the package can appear to move faster than light or even backward in time even if none of
15111-545: Is qualified in, the Doctor replies, "Practically everything." The Fourth Doctor states that his companion, Harry Sullivan , is a doctor of medicine, while he is "a doctor of many things" ( Revenge of the Cybermen , 1975). The Fifth Doctor claims to be a doctor "of everything" in Four to Doomsday (1982), and a message to the same effect is related from the Tenth Doctor in " Utopia " (2007). In " The Tsuranga Conundrum " (2018),
15318-524: Is received before it is sent, in all reference frames. The signal could be said to have moved backward in time. This hypothetical scenario is sometimes referred to as a tachyonic antitelephone . Quantum-mechanical phenomena such as quantum teleportation , the EPR paradox , or quantum entanglement might appear to create a mechanism that allows for faster-than-light (FTL) communication or time travel, and in fact some interpretations of quantum mechanics such as
15525-625: Is repeated in the next episode, " The Day of the Doctor ", by the War Doctor , the Tenth Doctor and the Eleventh Doctor collectively. By contrast, the Eleventh Doctor had earlier spoke of the War Doctor as being the man who broke that promise, being the one to fight in the Time War before learning the actual fate of the Time Lords. Since contradicted by the television series, the 2003 Telos novella Frayed by Tara Samms , set prior to
15732-473: Is still being researched. Wormholes are a hypothetical warped spacetime permitted by the Einstein field equations of general relativity. A proposed time-travel machine using a traversable wormhole would hypothetically work in the following way: One end of the wormhole is accelerated to some significant fraction of the speed of light, perhaps with some advanced propulsion system , and then brought back to
15939-408: Is uncertain whether time travel to the past would be physically possible. Such travel, if at all feasible, may give rise to questions of causality . Forward time travel, outside the usual sense of the perception of time , is an extensively observed phenomenon and is well understood within the framework of special relativity and general relativity . However, making one body advance or delay more than
16146-504: Is used in the title of the serial Doctor Who and the Silurians , but this was a captioning error rather than an in-story mention. The only other time this occurs is in the title of episode five of The Chase , which is titled "The Death of Doctor Who". In " World Enough and Time " (2017), the Doctor's old friend and archenemy the Master (as Missy ) insists that the Doctor's real name is in fact Doctor Who and that he chose it himself;
16353-554: The Doctor Who Magazine issue dated April 2015, Steven Moffat said that the BBC suggested a spin-off series about the characters, but he rejected the idea due to his other commitments. The three characters have met with positive reviews from critics who praised their chemistry, as well as the humour concerning Strax and his Sontaran warrior habits, often at odds with the context. Nick Setchfield of SFX called Strax "just
16560-601: The Bohm interpretation presume that some information is being exchanged between particles instantaneously in order to maintain correlations between particles. This effect was referred to as " spooky action at a distance " by Einstein. Nevertheless, the fact that causality is preserved in quantum mechanics is a rigorous result in modern quantum field theories , and therefore modern theories do not allow for time travel or FTL communication . In any specific instance where FTL has been claimed, more detailed analysis has proven that to get
16767-524: The Eighth Doctor remarks that he is half-human on his mother's side, and recalls watching a meteor storm with his father on Gallifrey. The revived series never addresses a human mother again and at times even contradicted this remark: The half-human clone of the Tenth Doctor is initially disgusted to be half-human ("Journey's End") and the Twelfth Doctor rejects that he could be a hybrid of human and Time Lord ("Hell Bent"). The Doctor mentions having had
16974-620: The Eighth Doctor Adventures novel The Adventuress of Henrietta Street , the Doctor's second heart was surgically removed, resulting in the loss of his abilities to metabolise drugs and go without air; these are restored when he begins to grow a new heart after his old one 'dies' ( Camera Obscura ). In his final serial , the Second Doctor states that Time Lords can live forever, "barring accidents". When "accidents" do occur, Time Lords can usually regenerate into
17181-457: The Novikov self-consistency principle or a variation of the many-worlds interpretation with interacting worlds. Time travel to the past is theoretically possible in certain general relativity spacetime geometries that permit traveling faster than the speed of light , such as cosmic strings , traversable wormholes , and Alcubierre drives . The theory of general relativity does suggest
17388-666: The Sherlock Holmes stories. Amongst her unseen adventures is her capture of Jack the Ripper , whom she eats (she mentions in " A Good Man Goes to War " that she found him "stringy, but tasty all the same"). She hires a maid, Jenny Flint, who assists her in her investigations; the pair later marry. Jenny's backstory in "The Battle of Demons Run: Two Days Later" (2013) shows she was turned away from her family because of her " preferences in companionship ", and saved from attackers by Vastra, who took her on as an employee. The Doctor
17595-562: The Thirteenth Doctor states that she is a doctor of "medicine, science, engineering, candyfloss, Lego, philosophy, music, problems, people, hope. Mostly hope." While talking with Harry in Robot (1974–1975), the Doctor says, "You may be a doctor, but I'm the Doctor. The definite article, you might say." In The Ark in Space (1975), aired later that year, the Doctor mentions that his doctorate
17802-523: The University of Toronto , Canada, uses the analogy of a train traveling from Chicago to New York, but dropping off train cars at each station along the way, so that the center of the train moves forward at each stop; in this way, the speed of the center of the train exceeds the speed of any of the individual cars. Shengwang Du claims in a peer-reviewed journal to have observed single photons' precursors , saying that they travel no faster than c in
18009-601: The collective consciousness of the Cybermen informs the Doctor that he could be reconstructed from the "hole" — the missing records — that he has left behind, a mistake which the Doctor intends to rectify. Few individuals are said to know the Doctor's true name. River Song whispered something to the Tenth Doctor to make him trust her during " Silence in the Library "/" Forest of the Dead ", confirmed to have been his name towards
18216-633: The "World of the Ancients" ( Qin dynasty ) to retrieve a magical bell and then travels forward to the "World of the Future" ( Song dynasty ) to find an emperor who has been exiled in time. However, the time travel is taking place inside an illusory dream world created by the villain to distract and entrap him. Samuel Madden 's Memoirs of the Twentieth Century (1733) is a series of letters from British ambassadors in 1997 and 1998 to diplomats in
18423-418: The 50th anniversary special " The Day of the Doctor ". The Tenth and Eleventh Doctors explained that Hurt's regeneration was not the Doctor because his actions during the Time War were a betrayal of the promise that name symbolized. "The Day of the Doctor" revisited the last day of the Time War after "The End of Time" and revealed that the interference of the future Doctors and future companion Clara Oswald caused
18630-583: The Armageddon Factor , it is revealed that the Doctor scraped through the academy with 51% on his second attempt. In The Time Meddler , it is said that the Doctor was fifty years before the Meddling Monk . In Time and the Rani , the Doctor claims to have attended university alongside the Rani , specialising in thermodynamics. At the academy, he met his childhood friend the Master and
18837-618: The Big Finish spin-off audio series Gallifrey and Bernice Summerfield . In the novel Father Time , the Eighth Doctor, during his hundred-year exile on Earth, found an orphaned Time Lord girl named Miranda whom he adopted and raised until she was 16. In the novel Sometime Never... , she returned to the Doctor with her daughter Zezanne. She was also the central character in a three-issue comic book series published by Comeuppance Comics in 2003. Author Lance Parkin, who devised
19044-521: The Cybermen . The Doctor's standing in Time Lord society has waxed and waned over the years, from being a hunted man who was eventually punished with a forced regeneration and an exile sentence on Earth, to being appointed Lord President of the High Council. He does not assume the office for very long, fleeing Gallifrey after his appointment rather than accepting the limitations on his freedom that
19251-425: The Daleks , Susan and her husband David adopt three children whom they name David Campbell Jr, Ian and Barbara; named after David himself, Ian Chesterton and Barbara Wright , respectively. Irving Braxiatel , a character first introduced in the novel Theatre of War , was initially hinted at, and later confirmed to be, the Doctor's biological older brother. He has since become a recurring character, especially within
19458-509: The Doctor " (2013). In November 2013, the long-running children's show Blue Peter announced a competition for fans aged 6–15 to design 'sonic devices' for the characters, with the three winning designs appearing in Series 8. The following month the winning entries were revealed as a Sonic Hatpin , Sonic Gauntlet , and Sonic Lorgnette for Vastra, Jenny, and Strax respectively. The devices were featured in " Deep Breath ". In an interview in
19665-567: The Doctor ", released as a prelude to the 50th anniversary special, featured Paul McGann reprising his role as the Eighth Doctor and was set during the Last Great Time War, albeit much earlier than during "The End of Time". The mini-episode presented him as a conscientious objector to the war who regenerated under controlled circumstances into the War Doctor ( John Hurt ), a previously unseen incarnation created retroactively by Steven Moffat , Davies' successor as head writer, for
19872-414: The Doctor ". Spin-off media offer the explanation that the Doctor's true name is unpronounceable by humans. In " The Name of the Doctor ", the Eleventh Doctor tells companion Clara Oswald that the name "Doctor" is essentially a promise he made. The promise itself is revealed in " The Day of the Doctor ": "Never cruel nor cowardly. Never give up. Never give in." The episode " The Timeless Children " revised
20079-410: The Doctor as grandfather to his companion Susan". He wore long white hair and Edwardian costume, reflecting, Green says, a "definite sense of Englishness". When Hartnell left the programme after three years due to ill health, the role was handed over to character actor Patrick Troughton . As of 25 December 2018 , official television productions have depicted fourteen distinct incarnations of
20286-562: The Doctor as one of 45 cousins grown from his house's genetic loom as an adult. By contrast, the TV programme has shown Time Lords as children and stated that Time Lords can have sexual relationships. The Doctor is assumed to be or to have been married to Susan's grandmother, including by head writer Steven Moffat . In " Blink ", the Doctor mentioned that he was rubbish at his own wedding. In The Virgin New Adventures novel Cold Fusion ,
20493-489: The Doctor does not explain why to Jenny, as he himself does not know the answer at this time. The three characters reappear in the seventh series finale " The Name of the Doctor ", where they organise a meeting in a dream with Clara and River Song . During the "conference call", the three are captured by the Whisper Men, minions of the Great Intelligence, who uses them as bait to bring the Eleventh Doctor to his tomb on
20700-400: The Doctor evades answering the question, making their connection unclear. In Doctor Who: The Writer's Tale – The Final Chapter , Russell T Davies states that the character was conceived as the Doctor's mother, but her identity was left ambiguous to allow viewers to make up their own minds. In spin-off media, several individuals related to the Doctor have made appearances, and do not appear in
20907-464: The Doctor experienced a very lonely childhood. An elderly woman on Gallifrey died and was shrouded in veils and surrounded by flies, giving the Doctor recurring nightmares, which the confession dial in " Heaven Sent " would later visualise to torment him. In " Listen ", it is ambiguously revealed the Doctor as a child often slept alone in a barn in the Drylands (a desert region outside the city capital),
21114-433: The Doctor in the seventh series, particularly in " The Angels Take Manhattan ", confirmed that they were married; in "The Name of the Doctor", the Doctor refers to her as his "wife" after seeing a grave stone with her name on it, after initially answering "yes" when Clara asks if she was an "ex". In " The End of Time ", the Tenth Doctor mentions marrying Queen Elizabeth I and implies that they had sex, stating: "her nickname
21321-517: The Doctor is revealed as " the Other ", a mysterious figure in Gallifreyan lore who co-founded Time Lord society with Rassilon and Omega . After a curse renders Gallifrey sterile, the Other devises biotechnological looms to "weave" new Time Lords; his granddaughter Susan is Gallifrey's last natural child. To escape a civil war with Rassilon, the Other throws himself into the loom system, where he
21528-482: The Doctor reveals that he is able to perceive the fabric of time, discerning "fixed points" and "points in flux" – moments when history must remain as it was originally versus moments when he can change or influence the original course of events, as well as all past, present and possible future events. However, in " Kill the Moon ", the Twelfth Doctor claims that there are "grey areas", points in time for which he cannot see
21735-517: The Doctor says he grew up in a house on a mountainside and talks about a hermit who lived under a tree behind the house and inspired the Doctor when he was depressed. He is later reunited with this former mentor, now on Earth posing as the abbot K'anpo Rimpoche, in Planet of the Spiders . In " The Girl in the Fireplace ", according to Madame de Pompadour who psychically linked with the Doctor's memories,
21942-764: The Doctor takes off, leaving Clara in Victorian London, Clara asks Vastra if she can stay with them. Vastra states that she is of course welcome, but she should have no doubt of the Doctor's return. The Doctor then indeed comes back to pick her up, and they leave the house to bring Clara back home. Strax first appeared in Jago & Litefoot in 2015 alongside Henry Gordon Jago ( Christopher Benjamin ) and George Litefoot ( Trevor Baxter ). In 2017, Neve McIntosh joined Big Finish starring in The Churchill Years range. All three featured together in audio for
22149-447: The Doctor through their adventures and serve as audience surrogate characters to ask questions which allow the Doctor to provide relevant exposition. "Doctor" is a self-selected alias. In episodes specifically under showrunner Steven Moffat , the story arcs surrounding events in the Doctor's future implied serious consequences in the event of the Doctor's true name being spoken, with the nature of these finally revealed in " The Time of
22356-417: The Doctor tries to reassure his companion that Missy is joking, although later in the episode he self-identifies by that name. In " Twice Upon a Time ", before regeneration the Twelfth Doctor states that no one would ever understand his name except for children, saying: "If their hearts are in the right place and the stars are too, children can hear your name." Peter Capaldi offered his own theory regarding
22563-790: The Doctor's early life. In the Past Doctor Adventures novel Divided Loyalties , the Doctor recalls his Academy years in a dream induced by the Celestial Toymaker. According to this, he was a member of an organisation called the Deca, ten brilliant Academy students campaigning for increased Time Lord intervention, alongside Mortimus (the Meddling Monk) , Ushas (the Rani) , Koschei (the Master) , Magnus (the War Chief) , Drax ,
22770-523: The Doctor's future new companion Clara Oswald to find him and support them in their fight against the Great Intelligence . A high fall kills Clara, whose death indirectly lets the Doctor defeat the Great Intelligence. The trio — and more particularly Jenny — have a central role in the first half of " The Crimson Horror " (2013), set in 1893, in which they investigate a series of strange deaths. They travel to Yorkshire , where Jenny infiltrates
22977-498: The Doctor's hearts simultaneously would accomplish this (as demonstrated in the Eleventh Doctor story " The Impossible Astronaut "). The Chancellery Guard (Gallifrey's equivalent of a police force) are armed with stasers, weapons capable of suppressing regeneration. In Death of the Doctor , a serial from spin-off programme The Sarah Jane Adventures , the Eleventh Doctor flippantly responds to Clyde Langer that he can regenerate "507" times; writer Russell T. Davies intended this line as
23184-434: The Doctor's origins, revealing a scientist and space explorer named Tecteun who found a lone, mysterious child with a supernatural physiology – one not belonging to any other life form or species – and an immense intelligence. She adopted the child and studied her, successfully grafting her regeneration capacity (and possibly other traits) into her own species, the Shobogans, and herself. This species, who would eventually become
23391-468: The Doctor's other families (adopted or not) are rare in the programme. In The Tomb of the Cybermen , when asked about his family, the Second Doctor says his memories of them are alive when he wants them to be; otherwise they sleep in his mind and he forgets. In The Curse of Fenric , when asked if he has family, the Seventh Doctor replies that he does not know. In the 1996 television movie ,
23598-461: The Doctor's real name, commenting: "I don't think human beings could even really say his name. But I think we might be able to hear it, at a certain frequency. If the stars are in the right place, and your heart's in the right place, you'll hear it." On occasion, the Doctor uses other aliases, such as "John Smith". In the Fourth Doctor serial The Armageddon Factor , the Doctor runs into
23805-431: The Doctor's surname as she believed was the intent of the dialogue. The 2011 mid-series finale " A Good Man Goes to War ", also written by Moffat, suggested through the character of River Song that the Doctor's travels had influenced the etymology of the word "doctor", perverting its meaning on some worlds from "wise man" or "healer" to "great warrior". In " The End of Time " (2009–2010) it is mentioned that after he smote
24012-428: The Doctor. The longest-lasting on-screen incarnation is the Fourth Doctor , played by Tom Baker for seven years. Within the narrative, these changes were explained as regeneration , a biological process which heals a Time Lord when their incarnation is about to die. Consequently, the Time Lord is given a wholly new body. In The Deadly Assassin , the concept of a regeneration limit is introduced, giving Time Lords
24219-637: The Headless Monks at Demons Run. At the time, Strax is a Sontaran "nurse" taking care of the wounded soldiers on a battlefield as part of a penance imposed on him. Before he can answer Captain Harcourt as to who came up with this penance, the Doctor arrives in his TARDIS to take him to Demons Run. They fight together against their enemies and succeed in saving Amy, but Strax is mortally wounded and appears to die after saying his last words to Rory Williams . In "The Battle of Demons Run: Two Days Later",
24426-509: The Homeworld/Gallifrey abandon their names to symbolise how they are leaving their culture. Similarly, the novel Lungbarrow reveals that the Doctor's name has been struck from the records of his family and therefore cannot be spoken. Quite apart from his name, why the Doctor uses the title "The Doctor" has never been fully explained on screen. The Doctor, at first, said that he was not a physician , often describing himself as
24633-757: The Islamic tradition is of Uzair (usually identified with the Biblical Ezra ) whose grief at the Destruction of Jerusalem by the Babylonians was so great that God took his soul and brought him back to life after Jerusalem was reconstructed. He rode on his revived donkey and entered his native place. But the people did not recognize him, nor did his household, except the maid, who was now an old blind woman. He prayed to God to cure her blindness and she could see again. He meets his son who recognized him by
24840-569: The Legacy of Rassilon; as a result, the Doctor's children were systemically culled. The Doctor managed to help Patience escape through the use of the Machine, a prototype TARDIS, after assuring that her daughter-in-law had given birth to a girl named Susan and promised that he would keep the child safely away from Gallifrey. In " The Wedding of River Song ", the Doctor marries recurring companion and love interest River Song . Comments by both River and
25047-580: The MWI". Everett also argues that even if Deutsch's approach is correct, it would imply that any macroscopic object composed of multiple particles would be split apart when traveling back in time through a wormhole, with different particles emerging in different worlds. Certain experiments carried out give the impression of reversed causality , but fail to show it under closer examination. The delayed-choice quantum eraser experiment performed by Marlan Scully involves pairs of entangled photons that are divided into "signal photons" and "idler photons", with
25254-616: The Master, taught by Cardinal Sendok. In the Virgin Missing Adventures novel Goth Opera , it is said the Doctor was a frequent prankster while at the academy, introducing cats into Gallifrey's ecosystem with his friend Ruath and electrifying a "perigosto stick" belonging to his teacher, Borusa. Feeling that too much of the Doctor's backstory had been revealed by the Seventh Doctor 's era, writers Andrew Cartmel , Ben Aaronovitch and Marc Platt developed
25461-586: The Sleeper Awakes (1899) by H. G. Wells. Prolonged sleep is used as a means of time travel in these stories. The date of the earliest work about backwards time travel is uncertain. The Chinese novel A Supplement to the Journey to the West ( c. 1640 ) by Dong Yue features magical mirrors and jade gateways that connect various points in time. The protagonist Sun Wukong travels back in time to
25668-516: The Spiders and " The End of Time ". The Doctor has withstood, with minimal damage, exposure to electricity deadly enough to kill a human ( Terror of the Zygons , Genesis of the Daleks , " Aliens of London ", " The Christmas Invasion ", " The Idiot's Lantern ", " Evolution of the Daleks " and spin-off audio Spare Parts ). Certain stories imply that the Time Lord is resistant to cold temperatures (" 42 "). To counter extreme trauma, such as exposure to
25875-497: The TARDIS. Upon finding the TARDIS, they find emerging from it a recently regenerated Twelfth Doctor , who falls unconscious. The three, along with Clara, take him back to their home to rest, while they attempt to solve the problem of the dinosaur. However, the Doctor soon wakes up and tries to solve it himself, only to witness the dinosaur spontaneously combust , and Vastra informs the Doctor that there have been similar murders recently. The Doctor vanishes thereafter and Clara becomes
26082-497: The Tenth Doctor confirms that he had at one point been a father and that he lost his children "a long time ago", saying "When they died that part of me died with them"; the nature of their deaths, however, has never been explained, as it is suggested that whatever happened to his family is very painful for the Doctor to talk about. In " The Woman Who Fell to Earth " when the Thirteenth Doctor is questioned how she copes with
26289-526: The Third, Twelfth and Thirteenth Doctors), has won several sword fights against skilled opponents, and is able to make extremely difficult shots with firearms and, in The Face of Evil , with a crossbow. Thanks to exposure to many of history's greatest experts, including those from the future, the Doctor is a talented boxer, musician, organist, scientist and singer (able to shatter windows with his voice), and has
26496-461: The Time Lords, was restricted to a limit of twelve regenerations by a later incarnation of Tecteun. Tecteun and their child were eventually inducted into a clandestine Time Lord organisation known as the Division. After an unknown amount of regenerations, Tecteun's child began calling themself "Doctor". The Fugitive Doctor , true to her title, was on the run from the Division in a TARDIS disguised as
26703-426: The Twelfth Doctor ( Peter Capaldi ). The Twelfth Doctor later claims to be uncertain he "won't keep regenerating forever" ("Kill the Moon"), and even Rassilon, the president of the Time Lords, expresses uncertainty about how many regenerations the Doctor has available to him. Other skills include his mental communication with other Time Lords, in some cases over a galaxy's distance. His skill with hypnosis requires only
26910-425: The War Doctor to change his plan at the last moment. Ultimately, Gallifrey was hidden in a parallel dimension and the Daleks destroyed themselves in the ensuing crossfire; to all observers, it appeared as though the two races had been annihilated together. The unsynchronized timestreams caused the War Doctor to forget the specifics of his actions at this time. The Doctor remembered committing the apparent genocide during
27117-500: The Wasp " (2008) he was able to sense the changes in his body's enzymes (i.e. cyanide poisoning) and expel the cyanide from his body by ingesting a concoction of ginger beer , protein foods and salts. The Doctor has shown a resistance to temporal effects and has demonstrated telepathic ability, both the ability to mentally connect to other incarnations of themselves they have encountered (" The Five Doctors "), and an ability to enter into
27324-422: The absence of time travelers fails to prove time travel is physically impossible; it might be that time travel is physically possible but is never developed or is cautiously used. Carl Sagan once suggested the possibility that time travelers could be here but are disguising their existence or are not recognized as time travelers. Some versions of general relativity suggest that time travel might only be possible in
27531-529: The academy and his affiliation with the notoriously devious Prydonian chapter of Time Lords. In " The Sound of Drums ", the Doctor describes an academy initiation where, at the age of eight, Gallifreyan children were taken from their families and made to look into the Untempered Schism, a gap in the fabric of reality, to view the Time Vortex. According to the Doctor, when regarding the effects of
27738-471: The alias "Dr. Bowman" in the 1996 Doctor Who television movie . Time travel Time travel is the hypothetical activity of traveling into the past or future . Time travel is a concept in philosophy and fiction , particularly science fiction . In fiction , time travel is typically achieved through the use of a device known as a time machine . The idea of a time machine was popularized by H. G. Wells 's 1895 novel The Time Machine . It
27945-399: The appearance of closed timelike curves." When a signal is sent from one location and received at another location, then as long as the signal is moving at the speed of light or slower, the mathematics of simultaneity in the theory of relativity show that all reference frames agree that the transmission-event happened before the reception-event. When the signal travels faster than light, it
28152-416: The battle. He is, however, shown to be awakened by Vastra and Flint a couple of days later in the webisode "The Battle of Demons Run: Two Days Later"; he then becomes their butler in the 19th century. Since their first appearance, the trio have appeared various times to help the Doctor; they have a central role in the first half of " The Crimson Horror " (2013). Their last episode was 2014's " Deep Breath ",
28359-411: The case that backward time travel could be possible but that it would be impossible to actually change the past in any way, an idea similar to the proposed Novikov self-consistency principle in physics. According to the philosophical theory of compossibility , what can happen, for example in the context of time travel, must be weighed against the context of everything relating to the situation. If
28566-516: The causal future of the world line is also in its causal past, a situation that can be described as time travel. Such a solution was first proposed by Kurt Gödel , a solution known as the Gödel metric , but his (and others') solution requires the universe to have physical characteristics that it does not appear to have, such as rotation and lack of Hubble expansion . Whether general relativity forbids closed time-like curves for all realistic conditions
28773-429: The character of Dr Who first begins appearing in existing documentation from May of that year. It is possible that series co-creator Donald Wilson may have named the character; in a 1971 interview Wilson claimed to have come up with the series' title, and when this claim was put to Newman he did not dispute it. The character was first portrayed by William Hartnell in 1963. At the programme's beginning, nothing at all
28980-412: The character of Miranda, has hinted that her real father is a future incarnation of the Doctor which, if so, would make Zezanne the Doctor's biological granddaughter as well. The Virgin New Adventures novel Lungbarrow presents an alternative take on the Doctor's origins, suggesting that Time Lords are "loomed" in large batches of "cousins" and not produced via sexual reproduction. Lungbarrow portrays
29187-480: The character uses "the Doctor" because his actual name is impossible for humans to pronounce. For instance, the novel Vanderdeken's Children relates that the Doctor has already told Sam his real name, which is entirely alien and virtually unpronounceable. This is repeated by companion Peri Brown in the radio serial Slipback . The Faction Paradox encyclopaedia The Book of the War states that all renegades from
29394-492: The character's name, most frequently in the spin-off material of the 1960s and 1970s, but occasionally also in the TV series itself. For example, in The Gunfighters the Doctor assumes the name of Doctor Caligari and subsequently responds to the question "Doctor who?" with "yes, quite right." In the serial The War Machines , the computer WOTAN commands that "Doctor Who is required", and his human agents also use
29601-491: The docudrama An Adventure in Space and Time as part of the 50th-anniversary celebrations of Doctor Who , which starred David Bradley as William Hartnell . Although Time Lords resemble humans, their physiology differs in key respects. Like other members of their race, the Doctor has two hearts (binary vascular system), a "respiratory bypass system" that allows the Doctor to go without air, an internal body temperature of 15–16 °C (60 °F) and occasionally exhibits
29808-484: The effects of acceleration and the effects of gravity as equivalent , and shows that time dilation also occurs in gravity wells , with a clock deeper in the well ticking more slowly; this effect is taken into account when calibrating the clocks on the satellites of the Global Positioning System , and it could lead to significant differences in rates of aging for observers at different distances from
30015-416: The end of "Forest of the Dead". The events of " The Time of the Doctor " make it clear that his people, the Time Lords, know his true name, despite calling him by his chosen alias as "the Doctor" even in formal settings such as court. Despite the common belief amongst some areas of the fanbase that the Doctor should never be referred to by the name of the series, "Doctor Who" is actually fairly often used as
30222-672: The episode " Deep Breath ", wearing and using the Sonic Gauntlet designed for that episode. Strax is a member of an alien warrior race, the Sontarans . Strax was forced to serve as a nurse, healing the injured as punishment for being defeated by the Doctor during the Sontaran invasion of Earth. This is contrary to the Sontaran's warrior instincts and mentality, and as such, he occasionally slips back into his Sontaran ways and mannerisms. In "A Good Man Goes to War", Strax states that he
30429-431: The events of past serials such as Genesis of the Daleks have been retroactively attributed to the Time War. It was never shown on-screen until " The End of Time ", which was both Davies' last story as head writer and producer and David Tennant 's last regular story as the Tenth Doctor. This episode featured brief views of Gallifrey and the Time Lords on the last day of the Time War. The 2013 mini-episode " The Night of
30636-430: The famous and easy-to-replicate observation of atmospheric muon decay . The theory of relativity states that the speed of light is invariant for all observers in any frame of reference ; that is, it is always the same. Time dilation is a direct consequence of the invariance of the speed of light. Time dilation may be regarded in a limited sense as "time travel into the future": a person may use time dilation so that
30843-415: The fictional narrative, the Doctor is a Time Lord who travels through time and space in a dimensionally transcendental – "bigger on the inside" – time machine : the TARDIS . This time machine, whose name is an acronym for Time And Relative Dimension(s) In Space , takes the exterior form of a 1963 police telephone call box and retains the appearance throughout the programme. Human companions accompany
31050-473: The film Somewhere in Time as an example of such an ontological paradox, where a watch is given to a person, and 60 years later the same watch is brought back in time and given to the same character. Ross states that entropy of the watch will increase, and the watch carried back in time will be more worn with each repetition of its history. The second law of thermodynamics is understood by modern physicists to be
31257-526: The first episode starring the Twelfth Doctor . They also have their own spin-off novella, Devil in the Smoke (2012), and spin-off novel, Silhouette (2014), and the trio have appeared in several online "minisodes", with Strax additionally appearing in a series of "Field Report" videos posted to the Doctor Who website. In 2014, they appeared without the Doctor in the Doctor Who Magazine comic strip in
31464-489: The first story to feature an alternate history created as a result of time travel. One of the first stories to feature time travel by means of a machine is " The Clock that Went Backward " by Edward Page Mitchell , which appeared in the New York Sun in 1881. However, the mechanism borders on fantasy. An unusual clock, when wound, runs backwards and transports people nearby back in time. The author does not explain
31671-521: The first time in 2019's The Eighth of March , which also served as Jenny Flint's debut in audio form. In 2019, four sets titled The Paternoster Gang were to be released featuring all three members. Heritage 1 , Heritage 2 , Heritage 3 , and Heritage 4 were released in June 2019, October 2019, March 2020 and October 2020, respectively. McIntosh previously appeared in the series portraying two other Silurian female characters, sisters Alaya and Restac, in
31878-471: The first time-machine story, but I'm not sure that a clock quite counts". H. G. Wells ' The Time Machine (1895) popularized the concept of time travel by mechanical means. Some theories, most notably special and general relativity , suggest that suitable geometries of spacetime or specific types of motion in space might allow time travel into the past and future if these geometries or motions were possible. In technical papers, physicists discuss
32085-549: The first to toy with the rich idea of time-travel in the form of an artifact sent backward from the future to be discovered in the present". In the science fiction anthology Far Boundaries (1951), editor August Derleth claims that an early short story about time travel is An Anachronism; or, Missing One's Coach , written for the Dublin Literary Magazine by an anonymous author in the June 1838 issue . While
32292-432: The idea of absolute time , while his contemporary Gottfried Wilhelm Leibniz maintained that time is only a relation between events and it cannot be expressed independently. The latter approach eventually gave rise to the spacetime of relativity . Many philosophers have argued that relativity implies eternalism , the idea that the past and future exist in a real sense, not only as changes that occurred or will occur to
32499-413: The initiation on participants: "Some would be inspired, some would run away and some would go mad (as he suggests happened to his nemesis, the Master )." When asked to which group he belonged, he replied, "Oh, the ones that ran away. I never stopped!" The Doctor was taught by future Lord President Borusa and Azmael , where he met Drax , with whom he attended a Tech course as part of the class of '92. In
32706-469: The lives of his ninth, tenth and eleventh incarnations up until the time of the Eleventh Doctor's present. The character of the Doctor was created by BBC Head of Drama, Sydney Newman . The first format document for the programme that was to become Doctor Who – then provisionally titled The Troubleshooters – was written in March 1963 by C. E. Webber , a staff writer who had been brought in to help develop
32913-411: The local laws of physics in a region of spacetime containing time travelers cannot be any different from the local laws of physics in any other region of spacetime. The philosopher Kelley L. Ross argues in "Time Travel Paradoxes" that in a scenario involving a physical object whose world-line or history forms a closed loop in time there can be a violation of the second law of thermodynamics . Ross uses
33120-400: The loss of her family, she states that she carries the memories of them with her and thus makes them a part of who she is, saying "even though they're gone from the world ... they're never gone from me." In " The End of Time ", a mysterious individual, referred to in the episode credits as "The Woman", appears unexpectedly to Wilfred Mott throughout both episodes. She is later revealed to be
33327-415: The marriages to Elizabeth I and Marilyn Monroe to count when questioned on how many wives the Doctor had had, remarking that he was married to Susan's grandmother and River Song. An adventurous scientist, the Doctor usually solves problems with his wits rather than with force. With the exception of his sonic screwdriver (which cannot kill, wound or maim), the Doctor detests weapons and uses violence only as
33534-471: The memories of other individuals (" The Girl in the Fireplace "). The Doctor can apparently reverse this process, sharing their memory with another, as shown in " The Lodger ". Some humans can enter the Doctor's memories after the Doctor enters theirs, as demonstrated by Madame de Pompadour (much to the Doctor's surprise) in "The Girl in the Fireplace", when she explains, "A door, once opened, may be stepped through in either direction." In " The Fires of Pompeii ",
33741-490: The moon. This event had a massive impact on the Doctor, who theorized that he himself was possibly the Hybrid. This is one reason the Doctor has stated as to why he decided to leave Gallifrey – out of fear. He has given convoluted and contradictory reasons as to why he left, for many reasons such as because his life path was pre-determined from his hidden previous life. The Doctor stole a TARDIS with his granddaughter Susan from
33948-696: The name of "Doctor von Wer" (a German approximation of "Doctor Who"), and signs himself as "Dr. W" in The Underwater Menace . He similarly poses as "the Great Wizard Quiquaequod" in The Dæmons ( qui , quae and quod being, respectively, the masculine, feminine and neuter Latin translation of the nominative form of who ). The Master also utilised Latin translation in the same serial, posing as "Mr Magister". The Eighth Doctor 's companion Grace briefly refers to him by
34155-411: The name. The Third Doctor 's car, dubbed "Bessie", carried the plate WHO 1, the only ongoing reference to the "Doctor Who" enigma in the original programme. The Third Doctor later drove an outlandish vehicle called the "Whomobile" in publicity materials, but it is never referred to as such in the programme, being simply known as "the Doctor's car" (or "my car", as the Doctor puts it). The name "Doctor Who"
34362-671: The narrator waits under a tree for a coach to take him out of Newcastle upon Tyne , he is transported back in time over a thousand years. He encounters the Venerable Bede in a monastery and explains to him the developments of the coming centuries. However, the story never makes it clear whether these events are real or a dream. Another early work about time travel is The Forebears of Kalimeros: Alexander, son of Philip of Macedon by Alexander Veltman published in 1836. Charles Dickens 's A Christmas Carol (1843) has early depictions of mystical time travel in both directions, as
34569-416: The near future. With current technologies, it is only possible to cause a human traveler to age less than companions on Earth by a few milliseconds after a few hundred days of space travel. Philosophers have discussed the philosophy of space and time since at least the time of ancient Greece ; for example, Parmenides presented the view that time is an illusion. Centuries later, Isaac Newton supported
34776-467: The null energy condition, and many physicists believe that the required negative energy may actually be possible due to the Casimir effect in quantum physics. Although early calculations suggested that a very large amount of negative energy would be required, later calculations showed that the amount of negative energy can be made arbitrarily small. In 1993, Matt Visser argued that the two mouths of
34983-410: The origin or properties of the clock. Enrique Gaspar y Rimbau 's El Anacronópete (1887) may have been the first story to feature a vessel engineered to travel through time. Andrew Sawyer has commented that the story "does seem to be the first literary description of a time machine noted so far", adding that "Edward Page Mitchell's story The Clock That Went Backward (1881) is usually described as
35190-521: The outcome. Like many other alien species in the programme, the Doctor is able to sense when their own species is within proximity through an inherent telepathic connection. The Doctor exhibits some weaknesses uncommon to humans. For example, according to The Mind of Evil (1971), a tablet of aspirin could kill him. In " Cold Blood ", a process meant to decontaminate him of bacteria from the surface of Earth causes him intense pain, and he says it could have killed him if allowed to proceed to completion. In
35397-407: The outside. One significant limitation of such a time machine is that it is only possible to go as far back in time as the initial creation of the machine; in essence, it is more of a path through time than it is a device that itself moves through time, and it would not allow the technology itself to be moved backward in time. According to current theories on the nature of wormholes, construction of
35604-410: The pair grew up together. In " The End of Time ", the Master recollects their childhood together where they would run all day across his father's field, described as 'pastures of red grass stretching far across the slopes of Mount Perdition' and the boys would call up at the sky. In " World Enough and Time ", the Doctor claims that they both made a special pact where together they would visit every star in
35811-431: The past is a certain way, it's not possible for it to be any other way. What can happen when a time traveler visits the past is limited to what did happen, in order to prevent logical contradictions. The Novikov self-consistency principle , named after Igor Dmitrievich Novikov , states that any actions taken by a time traveler or by an object that travels back in time were part of history all along, and therefore it
36018-404: The past, conveying the political and religious conditions of the future. Because the narrator receives these letters from his guardian angel , Paul Alkon suggests in his book Origins of Futuristic Fiction that "the first time-traveler in English literature is a guardian angel". Madden does not explain how the angel obtains these documents, but Alkon asserts that Madden "deserves recognition as
36225-438: The planet Trenzalore. The Doctor unhesitatingly goes to rescue them, recalling their caring and concern for him in "The Snowmen" and feeling a duty towards them. After the Doctor arrives on Trenzalore with Clara, the Great Intelligence scatters itself across the Doctor's timeline to destroy him. As history changes, Jenny disappears and Strax forgets his friendship with Vastra and attacks her, forcing her to defend herself. She points
36432-485: The point of origin. Alternatively, another way is to take one entrance of the wormhole and move it to within the gravitational field of an object that has higher gravity than the other entrance, and then return it to a position near the other entrance. For both these methods, time dilation causes the end of the wormhole that has been moved to have aged less, or become "younger", than the stationary end as seen by an external observer; however, time connects differently through
36639-411: The poisonous fungus in The Seeds of Death and after being shot in Spearhead from Space , the Doctor can go into a self-induced coma until they recover. The Doctor's hypersensitive body and senses enable them to detect anomalies humans cannot, such as identifying alien species, blood type or chemical composition by taste and determining location or time period by sniffing the air. In " The Unicorn and
36846-444: The possibility of closed timelike curves , which are world lines that form closed loops in spacetime, allowing objects to return to their own past. There are known to be solutions to the equations of general relativity that describe spacetimes which contain closed timelike curves, such as Gödel spacetime , but the physical plausibility of these solutions is uncertain. Many in the scientific community believe that backward time travel
37053-534: The possibility of generating a positive result demonstrating the existence of time travel, but have failed so far—no time travelers are known to have attended either event. Some versions of the many-worlds interpretation can be used to suggest that future humans have traveled back in time, but have traveled back to the meeting time and place in a parallel universe . There is a great deal of observable evidence for time dilation in special relativity and gravitational time dilation in general relativity, for example in
37260-440: The present time. Events such as Perth's Destination Day , MIT 's Time Traveler Convention and Stephen Hawking's Reception For Time Travellers heavily publicized permanent "advertisements" of a meeting time and place for future time travelers to meet. In 1982, a group in Baltimore , Maryland , identifying itself as the Krononauts, hosted an event of this type welcoming visitors from the future. These experiments only stood
37467-437: The present. Philosopher of science Dean Rickles disagrees with some qualifications, but notes that "the consensus among philosophers seems to be that special and general relativity are incompatible with presentism". Some philosophers view time as a dimension equal to spatial dimensions, that future events are "already there" in the same sense different places exist, and that there is no objective flow of time; however, this view
37674-400: The programme's first episode in 1963, presents the alternative explanation that the Doctor was given that name by medical staff on a foreign planet and liked it. To make up for his lack of a practical name, the Doctor often relies upon convenient pseudonyms. In The Gunfighters (1966), the First Doctor uses the alias Dr. Caligari . In The Highlanders (1966–67), the Second Doctor assumes
37881-490: The project. Webber's document contained a main character described as "The maturer man, 35–40, with some 'character twist'." Newman was not keen on this idea and – along with several other changes to Webber's initial format – created an alternative lead character named Dr Who, a crotchety older man piloting a stolen time machine, on the run from his own far-future world. No written record of Newman's conveyance of these ideas – believed to have taken place in April 1963 – exists, and
38088-463: The protagonist is transported to the prehistoric past by the magic of a "lame demon" (a French pun on Boitard's name), where he encounters a Plesiosaur and an apelike ancestor and is able to interact with ancient creatures. Edward Everett Hale 's "Hands Off" (1881) tells the story of an unnamed being, possibly the soul of a person who has recently died, who interferes with ancient Egyptian history by preventing Joseph 's enslavement. This may have been
38295-428: The protagonist, Ebenezer Scrooge, is transported to Christmases past and future. Other stories employ the same template, where a character naturally goes to sleep, and upon waking up finds themself in a different time. A clearer example of backward time travel is found in the 1861 book Paris avant les hommes ( Paris before Men ) by the French botanist and geologist Pierre Boitard , published posthumously. In this story,
38502-493: The pure waves in the sum do so. This effect cannot be used to send any matter, energy, or information faster than light, so this experiment is understood not to violate causality either. The physicists Günter Nimtz and Alfons Stahlhofen, of the University of Koblenz , claim to have violated Einstein's theory of relativity by transmitting photons faster than the speed of light. They say they have conducted an experiment in which microwave photons traveled "instantaneously" between
38709-419: The right side of crowdpleasing." Discussing their first appearance in "A Good Man Goes to War", Dan Martin from The Guardian called the three "the finest thing about it, lighting up the screen with every appearance." He called their return in "The Snowmen" wonderful, calling Strax "scene-stealingly adorable". He also stated "with marriage equality so much on the agenda, the divine Vastra and Jenny can only be
38916-432: The role would place on him (" The Five Doctors "), and is eventually deposed in absentia ( The Trial of a Time Lord ). By the time of his twelfth incarnation, he is regarded by many Gallifreyans as a war hero, "the man who won the Time War" (" Hell Bent "). In the first series of the 2005 revival, writer Russell T Davies introduced the concept of the Time War to streamline the Doctor's backstory for new viewers of
39123-410: The ruins of Gallifrey, unravel the Web of Time and burn a billion hearts to heal its own. The Wraiths then revealed to him the secret passage leading to another side of the city. The last anyone heard from him was that he apparently stole the moon and the President's wife; however, this was revealed to have been a lie spread about by the Shobogans when in reality it was the President's daughter and he lost
39330-436: The show. It was a war across all of time and space which ended when the Doctor presumably destroyed both the Time Lords and the Daleks . The Doctor's remorse for his actions in his Ninth , Tenth and Eleventh incarnations is a key part of his characterisation throughout the revival. The Time War happened between the 1996 television movie and 2005 opening episode " Rose " according to the show's internal chronology, although
39537-479: The signal photons emerging from one of two locations and their position later measured as in the double-slit experiment . Depending on how the idler photon is measured, the experimenter can either learn which of the two locations the signal photon emerged from or "erase" that information. Even though the signal photons can be measured before the choice has been made about the idler photons, the choice seems to retroactively determine whether or not an interference pattern
39744-418: The significance of the Doctor's name in his episodes since 2006's " The Girl in the Fireplace ", in which historical figure Madame de Pompadour reads the Doctor's mind and remarks, "Doctor who? It's more than just a secret, isn't it?" According to the in-vision commentary on the DVD release, David Tennant had to inform actress Sophia Myles (who played Madame de Pompadour) that she was not, in fact, revealing
39951-452: The sinking when tracking an alien entity in the novel The Left-Handed Hummingbird . The Doctor has also encountered many of Earth's historical figures. It is his tendency for becoming "involved" with the universe – in direct violation of official Time Lord policy – that has caused the Doctor to be labelled a renegade by the Time Lords as stated in The War Games . However, the Doctor's actions are largely tolerated as he saved Gallifrey and
40158-465: The skeptic Payasi that time in the Heavens passes differently than on Earth. The Japanese tale of " Urashima Tarō ", first described in the Manyoshu , tells of a young fisherman named Urashima-no-ko ( 浦嶋子 ) who visits an undersea palace. After three days, he returns home to his village and finds himself 300 years in the future, where he has been forgotten, his house is in ruins, and his family has died. One story in Judaism concerns Honi HaMe'agel ,
40365-400: The storyline The Crystal Throne (DWM #475–476). Since 2015, an ongoing series of short stories and a comic strip titled Strax and the Time Shark , featuring the three characters, has been a regular feature in Doctor Who Adventures magazine. The three characters became popular with audiences, with the presence of an inter-species same-sex couple also leading to some attention. Vastra is
40572-417: The television series, such as his grandchildren John and Gillian , who appeared alongside the First and Second Doctors in comics and annuals. Two different, conflicting accounts exist on the descendants of Susan after leaving the Doctor. In the audio play " An Earthly Child ", it is revealed that Susan has had a half-human child, Alex Campbell, the Doctor's great-grandson. Alternatively, in the novel Legacy of
40779-421: The tenure of the Eleventh Doctor involved the oldest question in the universe, revealed in " The Wedding of River Song " to be "Doctor who?", giving the phrase in-universe significance. In " The Name of the Doctor ", the Doctor's real name was revealed to be the password used to enter the Doctor's tomb following his death on the planet Trenzalore. The story arc was resolved in " The Time of the Doctor ", wherein it
40986-457: The time traveler were to change anything; there is a contradiction if the past becomes different from the way it is . The paradox is commonly described with a person who travels to the past and kills their own grandfather, prevents the existence of their father or mother, and therefore their own existence. Philosophers question whether these paradoxes prove time travel impossible. Some philosophers answer these paradoxes by arguing that it might be
41193-458: The two-part story " The Hungry Earth "/" Cold Blood " (2010). Starkey previously played Commander Skorr, one of the Sontarans, in the two-part story re-introducing the species, " The Sontaran Stratagem "/" The Poison Sky " (2008). He also portrayed another Sontaran character in " The End of Time " (2009–10) and in between appearances as Strax in " The Name of the Doctor " (2013) and " Deep Breath " (2014), he played two more Sontarans in " The Time of
41400-442: The universe several times. The Time Lords are partial to sending him on missions when deniability or expendability is needed, implied to have begun after his capture during The War Games and witnessed further in later stories, the Time Lords directing the Doctor and/or the TARDIS to specific locations in Colony in Space , The Curse of Peladon , The Mutants , Genesis of the Daleks , The Brain of Morbius and Attack of
41607-411: The universe; however, the Master was 'too busy burning them'. In " Hell Bent ", one day at the academy, the Doctor found himself lost inside the Cloisters (an area located deep beneath the citadel) and spent four days inside. He was contacted by a Wraith who told him about the prophecy of a legendary creature known as 'the Hybrid', prophesied to have been crossbred from two warrior races that would stand in
41814-416: The wormhole than outside it, so that synchronized clocks at either end of the wormhole will always remain synchronized as seen by an observer passing through the wormhole, no matter how the two ends move around. This means that an observer entering the "younger" end would exit the "older" end at a time when it was the same age as the "younger" end, effectively going back in time as seen by an observer from
42021-422: Was instrumental in preventing a family from boarding the Titanic prior to her fateful voyage. In " The End of the World ", the Doctor recalls having been on board and surviving the Titanic's sinking to find himself "clinging to an iceberg". The Fourth Doctor mentioned this event in Robot and The Invasion of Time , where he insists that the sinking was not his fault; the Seventh Doctor became involved in
42228-432: Was present at their initial meeting, during which, Vastra recounts in " The Name of the Doctor " (2013), he saved Jenny's life. She shows herself to have acquired extremely formidable skills as a hand-to-hand combatant and swordswoman . She is shown in all of her appearances to be entirely comfortable with post-19th century technologies, time travel , and the TARDIS ; she is repeatedly seen using technology devices and, in
42435-404: Was revealed that the question had been projected by the Time Lords across all of time and space through a "crack in the skin of the universe" as a means of contacting the Doctor and seeing whether it was safe to leave the parallel universe in which their planet, Gallifrey , had been left following the events of " The Day of the Doctor ". This arc was penned by Steven Moffat , who has been exploring
42642-448: Was the one to release Swarm from imprisonment as part of the Division's plan to destroy the universe. She was disintegrated by Swarm shortly after briefly confronting the Thirteenth Doctor after she found out her true origins as the timeless child. Other than Tecteun and Susan Foreman , his granddaughter with whom he travelled during the first two seasons and who has been mentioned occasionally since, references to
42849-432: Was withdrawn from other children, and was cared for by guardian figures who privately doubted the child's ability as an eventual Time Lord. Through the dialogue, it is suggested that several Gallifreyan children were pressured into joining the army, a path which did not sit right with the Doctor's pacifist beliefs, and as a result he wished to enroll into the Time Lord Academy instead. The classic series refers to his time at
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