An alternate timeline was a reality that diverged from the "true" or "natural timeline" due to the actions of time travellers or other temporal phenomena. They were different from parallel universes in that they did not separate cleanly at the point of creation, resulting in the new timeline destroying the old one. (PROSE: Imperial Moon) The phenomenon may also have been described as an "interstitial spillage of time." (AUDIO: Project: Lazarus)

Physics Edit

Alternate timelines could be visited accidentally by jumping a time track (TV: The Space Museum, AUDIO: The Mutant Phase) or contacting other anomalies (AUDIO: Colditz) in the Time Vortex. Deliberate travel to these timelines was possible if the traveller possessed something, such as the sigil ring, that allowed them to change time streams. (PROSE: Goth Opera)

They may have diverged from points in history when there was temporal fluctuation. The power required to adjust the timeflow and overcome temporal inertia on such a scale couldn't fit on a single planet, but beings with enough power were capable of doing so, such as Sutekh, the Guardians of Time, Rassilon, and the Chronovores. Even the Doctor or the Master could have the know-how or inclination to create them. Because the universe only had a finite amount of mass and energy to exist as one universe, the creation of an alternate timeline adversely affected the real timeline, causing chaos throughout the universe; releasing enough energy could destroy the timeline and set history back on its correct course. The energy released when a TARDIS time rammed another could produce this energy. (PROSE: Blood Heat)

Though a timeline could be negated, memories of it could still be retained. (TV: The Big Bang, The Impossible Astronaut) Sometimes these memories were subconscious and only surfaced in dreams. (AUDIO: The Time of the Daleks, Jubilee) Multiple timelines could co-exist in one continuum; because of this, an individual with multiple futures could come in contact without any Blinovitch Limitation Effects. (AUDIO: Peri and the Piscon Paradox)

Occasionally, time was actually changed so that what was originally the future became an alternate timeline. These were not meant to replace the true timeline but were the result of changes to the real timeline including, apparently, WOTAN conquering Earth (PROSE: The Time Travellers) and the Doctor dying on Grace Alone (AUDIO: The First Wave) and later Trenzalore. (TV: The Name of the Doctor, The Time of the Doctor) This may have related to causality, with knowledge coming before an event rather than an event becoming knowledge. The Doctor encountered WOTAN after it'd conquered Earth in 1966, changing history when he later arrived in 1966; the opposite would be the Doctor arriving in an 1804 where the French Revolution was still happening, as he already knew this was incorrect. (PROSE: The Man in the Velvet Mask)

Two Earth Reptile temporal scientists theorised that after changes were made to history, it took twenty minutes for the new timeline to become established. (PROSE: The Crystal Bucephalus)

Metaphysics Edit

From a metaphysical viewpoint, alternate timelines constantly winked in and out of existence with every decision made, (AUDIO: The Wrong Doctors) always being extinguished as fewer and fewer choices became open. This was particularly affected by time travellers who changed the future whenever they arrived in a new time. This was the cosmic pain of the universe and in this manner Gabriel and Tanith were personifications of the timelines that never existed. (PROSE: Falls the Shadow)

The existence/creation of alternate timelines and parallel universes was held in check by the existence of the Time Vortex, which was sustained by the existence of the Time Lords who created it. (PROSE: The Domino Effect)

Terminology Edit

The phrase "alternate/alternative timeline/universe/reality" was sometimes used interchangeably with "parallel universe"; however, alternate timelines usually changed after a single moment in time, whereas parallel universes usually had more than one difference from the "normal" universe.

Timelines Edit

Timelines encountered by the Doctor Edit

Timeline Negated By Featured in
The TARDIS crash lands on a planet in a state of temporal flux, leading to Susan Foreman surviving alone via a Zero Cabinet, while everyone else dies.Susan Foreman and Alternate Susan, via the Blinovitch Limitation EffectAUDIO: Tick-Tock World
The First Doctor and his companions became exhibits in the Moroks' Space MuseumFirst Doctor, Ian Chesterton, Barbara Wright, and VickiTV: The Space Museum
Barbara Wright married Ptolemy I and became Queen of AlexandriaAlternate BarbaraPROSE: The Book of Shadows
The Monk switched the First Doctor with the Fifth Doctor, resulting in the Fifth Doctor making a decision different from his former self, and allowing the Monk to hijack his timelineFifth Doctor and Sophia, by forcing the Monk into a situation with his only way out being to give the Doctor back his timelineAUDIO: The Secret History
Christopher's death causes his father to leave and his mother to commit suicide, leaving his twin brother Robert alone until he finds a time machine and begins travelling.The First Doctor, Steven Taylor, Sara Kingdom, and RobertPROSE/AUDIO: The Little Drummer Boy
The First Doctor, Steven Taylor, and Oliver Harper died on Grace AloneOliver HarperAUDIO: The First Wave
1794 Earth became the World Machine, with the French Revolution continuing until 1804The Pageant after being confronted by the First DoctorPROSE: The Man in the Velvet Mask
WOTAN conquered Earth (this was the correct timeline before it was changed by the Doctor)First DoctorPROSE: The Time Travellers, TV: The War Machines
Mechanistria was taken over by machinespossibly negated by Drako, though he might not have succeededPROSE: Peril in Mechanistria
The Second Doctor's TARDIS collided with the First Doctor's TARDIS, diverting the earlier TARDIS from landing on Kembel, meaning the First Doctor never stopped the Daleks from developing the Time DestructorSecond Doctor and KatarinaAUDIO: Daughter of the Gods
The Monk switched the Second Doctor with the Sixth Doctor, so that the Sixth Doctor would make a different choice than his former self did originally, allowing the Monk to hijack the Doctor's timelineSixth Doctor and Zoe Heriot, by creating a time loop that ensures the end of the Great Cyber War occurs when it's supposed toAUDIO: Last of the Cybermen
Nancy Grover used Grold technology to become a goddessThird Doctor and Liz ShawPROSE: The Eye of the Giant
The Power Elite took over EarthThird DoctorPROSE: Prisoners of the Sun
Freedom fighters from the 22nd century assassinated Sir Reginald Styles, causing a war which enabled the Daleks to invade EarthThird Doctor and Jo GrantTV: Day of the Daleks
The Monk switched the Third Doctor with the Seventh Doctor, so that the Seventh Doctor would make a different choice than his former self did originally, allowing the Monk to hijack the Doctor's timelineJo Grant, by preventing the Seventh Doctor from sacrificing the TARDIS to save the EuropansAUDIO: The Defectors
Theodore Cassells's experiments led to a global war which devastated EarthThird DoctorCOMIC: A Stitch in Time
The Third Doctor regenerated on Dust and became infected by Faction Paradox's virus in the processEighth Doctor by destroying Gallifrey (PROSE: The Gallifrey Chronicles)PROSE: Interference - Book One, Interference - Book Two
Sutekh was freed in 1911 and devastated EarthFourth Doctor and Sarah Jane SmithTV: Pyramids of Mars
In the year 4000, Jalnik uses a crack in time to pull the Pantophagen out of the time Vortex, Earth is devastated by them.Fourth DoctorAUDIO: The Foe from the Future
Gallifrey is destroyed in the ancient past by the Machine, full of active fusion bombs, arriving on the planet, resulting in the Ferutu evolving to become the Lords of TimeFifth Doctor, Seventh Doctor, and the FerutuPROSE: Cold Fusion
Daleks underwent the Mutant PhaseDalek EmperorAUDIO: The Mutant Phase
John Smith and the Common Men were the most successful band in the world instead of the BeatlesFifth Doctor and NyssaAUDIO: 1963: Fanfare for the Common Men
Melanicus created the Millennium WarsFifth Doctor, Sir Justin, and ShaydeCOMIC: The Tides of Time
The 22nd century Dalek invasion didn't take placeFifth Doctor and NyssaAUDIO: Renaissance of the Daleks
Earth in 2008 was controlled by smoke creaturesFifth Doctor, Nyssa, and Thomas BrewsterAUDIO: The Haunting of Thomas Brewster
Adric created a city of intelligent scorpionsFifth Doctor and NyssaAUDIO: The Boy That Time Forgot
Phil and Trev created a perfect worldFifth Doctor, Nyssa, and Thomas BrewsterAUDIO: A Perfect World
Stockbridge had an Eternal SummerFifth Doctor, Nyssa, and Maxwell EdisonAUDIO: The Eternal Summer
Mike Bretherton investigated the missing people abducted by the HexagoraFifth DoctorAUDIO: Hexagora
In his fifth incarnation, the Doctor is killed prematurely by Brooke, causing stars to burn out across the universe.Brooke, by convincing Andrew Edwardson to take the Doctor's place, giving his own life to save his doppelganger.AUDIO: My Dinner with Andrew, The Furies
The Herd-Leader of the Bovine travelled back in time to warn himself he shouldn't help Columbus discover AmericaPeri Brown and Christopher ColumbusAUDIO: Trouble in Paradise
Walter Raleigh went back in time and encountered aliensSixth DoctorAUDIO: Voyage to the New World
The Doctor's arrival on the planet Bixor to investigate the cause of its destruction, turned out to be the actual cause of its destructionSixth DoctorAUDIO: The Wings of a Butterfly
CyberversePossibly negated when Evelyn Smythe left the Sixth DoctorWC: Real Time/AUDIO: Real Time
Daleks invaded Earth in 1903 and were defeated by the British Empirethe last surviving DalekAUDIO: Jubilee
Wolfgang Amadeus Mozart became immortalSixth Doctor and Evelyn SmytheAUDIO: My Own Private Wolfgang
Thomas Caxton fell through a tear in time, ending up in 1913. He then made multiple changes to the timeline in an attempt to prevent World War I.Sixth DoctorAUDIO: Fortunes of War
The Valeyard used the Nathemus to steal the Sixth Doctor's life, and eventually, the lives of every Time Lord to ever exist.Sixth DoctorAUDIO: The Brink of Death
President Bailey allowed the Slithergee race to settle on the first moon of the planet Puxatornee in the year 3060, which allowed the Slithergee to take complete control of the planet in the year 3090Seventh Doctor, Mel, Stuart, and ReedAUDIO: Flip-Flop
The assassination of President Bailey caused the next President, Mitchell, to declare war on the Slithergee race in the year 3060, the result of which left the planet Puxatornee devastated by the year 3090Seventh Doctor, Mel, Lieutenant Stuart, and Lieutenant ReedAUDIO: Flip-Flop
Alternate timeline (The Ripple Effect)Seventh DoctorPROSE: The Ripple Effect
Humans evolved into HaemovoresSeventh Doctor and AceTV: The Curse of Fenric
The Dark Matrix terrorised EnglandSeventh Doctor and AcePROSE: Matrix
The Nazis won World War II after a piece of laser technology was left at Colditz CastleAlternate Eighth Doctor and Elizabeth Klein (inadvertently)AUDIO: Colditz, Klein's Story
Vladimir Kryuchkov succeeded Konstantin Chernenko as leader of the Soviet Union, causing World War III to occur in 1989Seventh DoctorAUDIO: Protect and Survive
Adolf Hitler used the Timewyrm's power to enable Nazi Germany to conquer EarthSeventh Doctor and AcePROSE: Timewyrm: Exodus
Chad Boyle killed Dorothy McShane with a brick to the headAcePROSE: Timewyrm: Revelation
The Process came into being and enslaved the Time Scaphe crewSeventh Doctor and VaelPROSE: Cat's Cradle: Time's Crucible
Silurian EarthDestroyed, not negated, by Seventh DoctorPROSE: Blood Heat
The Garvond never came into beingArtemis the ChronovorePROSE: The Dimension Riders
Huitzilin died without becoming a psychevoreArtemis the ChronovorePROSE: The Left-Handed Hummingbird
The Land of Fiction remained inactiveArtemis the ChronovorePROSE: Conundrum
Brigadier Lethbridge-Stewart was shot and killed by a Vardan in 1976Artemis the ChronovorePROSE: No Future
Alternate timeline (Time & Time Again)Seventh Doctor, Ace, and Bernice SummerfieldCOMIC: Time & Time Again
The Knights of Velyshaa conquered GallifreyFifth Doctor, Sixth Doctor, Seventh Doctor, and the TemperonAUDIO: The Sirens of Time
Elizabeth Klein created the Galactic Reich after stealing the Doctor's TARDIS and making repeated corrections to the timelineSeventh Doctor, Elizabeth Klein, and the Selachians (the last two inadvertently, after being manipulated by the Doctor)AUDIO: The Architects of History
Edward Grainger wrote My Life With The DoctorSeventh DoctorPROSE: Testament
The Saturnius collided with the TARDISRiver SongAUDIO: The Unknown
Earth was destroyed by the Eye of HarmonyEighth Doctor and Grace HollowayTV: Doctor Who
Sato Katsura formed the Church of the Glorious Dead which conquered EarthKrotonCOMIC: The Glorious Dead
Humans didn't evolve and Earth was a Tractis colony known as ParatractisEighth Doctor, Sam Jones, and Jo GrantPROSE: Genocide
Edward Grove came to lifeEighth Doctor and Charley PollardAUDIO: The Chimes of Midnight
Sebastian Grayle became immortal and helped the Nimon conquer EarthEighth Doctor and Charley PollardAUDIO: Seasons of Fear
Shakespeare vanished from historyEighth Doctor and Charley PollardAUDIO: Invaders from Mars, AUDIO: The Time of the Daleks
Daleks invaded Earth in the 17th centuryEighth Doctor and Charley PollardAUDIO: The Time of the Daleks
The Master used a conceptual bomb made from Bob Dovie's refusal to accept the existence of the Doctor's TARDIS to erase said TARDIS, thus meaning the Doctor never left GallifreyFirst Doctor, Second Doctor, Third Doctor, Fourth Doctor, Fifth Doctor, Sixth Doctor, Seventh Doctor, and Eighth DoctorAUDIO: The Light at the End
Morbius returned and defeated the Time LordsEighth Doctor, Time LordsAUDIO: The Vengeance of Morbius
Straxus became Kotris and saved the Dalek Time ControllerDalek Time ControllerAUDIO: The Great War, Fugitives, Tangled Web, X and the Daleks
Having broken through the quantum shield erected to protect Earth during the Last Great Time War, the Daleks arrived in East Berlin in 1961 and proceeded to exterminate humanity.Overruled but not negated by the War DoctorAUDIO: The Shadow Vortex
The Eternity Circle created the Temporal Cannon and Temporal Weapon Daleks and controlled the Tantalus Spiral.War Doctor and BorusaPROSE: Engines of War
Pete Tyler didn't die and Reapers began consuming humanityPete TylerTV: Father's Day
Giovanni Lucio helped Massimo conquer the Roman EmpireTenth Doctor and Rose TylerCOMIC: The Futurists
The Year That Never WasTenth Doctor, Martha Jones, and Captain Jack Harkness TV: Last of the Time Lords
The Pyroviles conquer EarthTenth Doctor and Donna NobleTV: The Fires of Pompeii
Gabby Gonzalez evolved into a Rogue Vortex Artifact, resulting in the Tenth Doctor leaving her in an empty gulf of spaceTenth Doctor, Twelfth Doctor, and Alternate GabbyCOMIC: Vortex Butterflies
The entire crew of Bowie Base One died on Mars on November 21, 2059 (this was the correct timeline before it was changed by the Doctor)Tenth DoctorTV: The Waters of Mars
The Tenth Doctor chose to let Wilfred Mott die in the Naismith mansion, eventually becoming the Time Lord Victorious and taking over the universeTenth Doctor, Eleventh Doctor, Twelfth Doctor, Gabby Gonzalez, Alice Obiefune, and Clara OswaldCOMIC: Four Doctors
The Progenitor Daleks repopulated Skaro and exterminated humanity to extinction in 1963Eleventh Doctor and Amy PondGAME: City of the Daleks
The Kin gained control of Earth meaning humanity was extinct in 2010Eleventh DoctorPROSE: Nothing O'Clock
Vincent Van Gogh paints the Krafayis into one of his worksEleventh Doctor and Amy PondTV: Vincent and the Doctor
The Doctor's TARDIS exploded, creating cracks in time which began erasing the universe's historyEleventh Doctor, Amy Pond, Rory Williams (Auton), and River Song (TV: The Big Bang)TV: Series 5
Kazran Sardick was a heartless and cruel old manEleventh Doctor and a young Kazran SardickTV: A Christmas Carol
Ship kidnapped people and wiped Foxtown off the map Eleventh Doctor PROSE: The Way Through the Woods
Amy Pond was stranded on Apalapucia for 36 yearsEleventh Doctor, Rory Williams, Amy Pond, Alternate Amy PondTV: The Girl Who Waited
River Song's WorldEleventh Doctor, Amy Pond, Rory Williams, River Song, and the TeselectaTV: The Wedding of River Song
The Eleventh Doctor chose not to undo River Song's World, living out his life with River Song while the universe diesTenth Doctor, Eleventh Doctor, Twelfth Doctor, Gabby Gonzalez, Alice Obiefune, and Clara OswaldCOMIC: Four Doctors
The Silurians attempted to pump poison onto Earth's surface to reclaim itEleventh Doctor and River SongGAME: The Eternity Clock
The Progenitor Daleks invaded and destroyed London in or before 2106Eleventh Doctor and River SongGAME: The Eternity Clock
Amy Pond was killed by Jack the RipperEleventh DoctorCOMIC: Ripper's Curse
The Cybermen conquered the galaxyEleventh Doctor and Jean-Luc PicardCOMIC: Assimilation²
Rory Williams remained imprisoned in Winter Quay for the rest of his lifeRory Williams and Amy PondTV: The Angels Take Manhattan
Penelope became the Paradox and killed the people who had wronged her.Eleventh Doctor and PenelopeAUDIO: The Art of Death
The Creevix erased the existence of Guy Taylor, allowing them to use his time machine to enter the universe on 23 November 2013 and consume itFirst Doctor, Susan Foreman, Second Doctor, Jamie McCrimmon, Zoe Heriot, Third Doctor, Mike Yates, Fourth Doctor, Romana II, Fifth Doctor, Adric, Nyssa, Tegan Jovanka, Sixth Doctor, Peri Brown, Seventh Doctor, Ace, Eighth Doctor, Charley Pollard, Ninth Doctor, Rose Tyler, Jack Harkness, Tenth Doctor, Donna Noble, Eleventh Doctor, Alice Watson, and Cedric Chivers AUDIO: The Time Machine
The TARDIS was damaged by van Baalen Bros. and self-destructedEleventh DoctorTV: Journey to the Centre of the TARDIS
The Great Intelligence negated the Doctor's victoriesClara OswaldTV: The Name of the Doctor
The Doctor died on Trenzalore and the planet became a battlefield graveyard (this may have been the correct timeline before it was changed)Clara Oswald, the Time Lords and the Eleventh DoctorTV: The Time of the Doctor
The memories of Clara Oswald and the Tenth, Eleventh, and Twelfth Doctors were rewritten to ensure the existence of an alternate Twelfth Doctor, while Alice Obiefune was killed by Voord guardsEleventh Doctor and Alice Obiefune, by planting a Weeping Angel that transported Gabby Gonzalez back in timeCOMIC: Four Doctors
The Twelfth Doctor didn't forgive Clara Oswald for betraying him, leading him to become the leader of the VoordTenth Doctor, Eleventh Doctor, Twelfth Doctor, Gabby Gonzalez, Alice Obiefune, and Clara OswaldCOMIC: Four Doctors
The Cybermen allied with Rassilon and started to alter history and harvest regenerative energy from Time Lords to use it in the creation of a new UniverseTwelfth Doctor, RassilonCOMIC: Supremacy of the Cybermen
The Raoultella planticola bacteria wiped out all life on Earth by 2018Twelfth DoctorTV The Pyramid at the End of the World
Captain Archibald Hamish Lethbridge-Stewart and a German soldier killed each other on December 25, 1914 (this was the correct timeline before it was changed by the Doctor)Twelfth DoctorTV: Twice Upon a Time

Timelines encountered by others Edit

Timeline Negated By Featured in
Peri Brown was not assassinated and lived with King Yrcanos as a Warrior QueenNot negated but existing due to a Time Lord factionAUDIO: Peri and the Piscon Paradox
Peri Brown did not live with Yrcanos and was returned to Earth with her memories of the Doctor erased save for her first adventure with himNot negated but existing due to a Time Lord factionAUDIO: Peri and the Piscon Paradox
Peri Brown's future was altered another three timesNot negated but existing due to a Time Lord factionAUDIO: Peri and the Piscon Paradox
The Seventh Doctor defeated the Vardan invasion of Earth by leaving clues for his past selfThe MonkPROSE: No Future
Insects of the Mind evolved as the dominant life on EarthThe existence of time travelPROSE: Falls the Shadow
Britain was a conformist republicThe existence of time travelPROSE: Falls the Shadow
The Dark took over members of TorchwoodTorchwood and Bilis MangerPROSE: The Twilight Streets
Andrea Yates' Worldalternate Andrea YatesTV: Whatever Happened to Sarah Jane?
The Trickster's WorldEddie and Barbara SmithTV: The Temptation of Sarah Jane Smith
Donna's Worldalternate Donna NobleTV: Turn Left
The stars go out in Pete's World as the walls of reality broke downDoctorDonnaTV: Journey's End
Ship erased Sarah Jane Smith, Luke Smith and Clyde LangerAdam Lloyd and Rani ChandraTV: The Mad Woman in the Attic
Taphony rapidly ages Alistair Gryffen while draining Jorjie Turner of her energy.Taphony, by departing through the vortex of the Space-Time Manipulator, reversing time by a day and resulting in everyone forgeting her bar K9 Mark 2.TV: Taphony and the Time Loop
Ben and Katy die in a fireSarah Jane Smith and Emily MorrisTV: Lost in Time
Deindum from the future conquered the galaxyBernice SummerfieldPROSE: Present Danger, AUDIO: Escaping the Future
Use of GENIEs cause devastation to the EarthA GENIE and those who commanded itPROSE: The Stone Rose
Simon Brown's public release of information regarding the atomic bomb causing Joseph Stalin to use his atomic bombs on the Earth to maintain control.Honoré Lechasseur and Emily Blandish travelling back to 1949 to stop events from occurring.PROSE: The Winning Side
John Hart meets Queen Victoria in 1887, marries her and ultimately becomes King of the British Empire.Jack Harkness, by dying despite being a fixed point in time, causing John Hart's version of reality to collapse.AUDIO: The Death of Captain Jack

Species from alternate timelines Edit

Some species existed entirely as a result of diverges in time, including the Haemovores, a result of Fenric poisoning humanity; (TV: The Curse of Fenric) the Mind, before being destroyed by Gabriel and Tanith; (PROSE: Falls the Shadow) the Daleks affected by the Mutant Phase - an evolution of Daleks; (AUDIO: The Mutant Phase) and the Skaro Degradations, Dalek permutations from other timelines. (PROSE: Engines of War)

Behind the scenes Edit

Terminology Edit

The phrase "alternate timeline" is used in The Ancestor Cell, Beige Planet Mars, The Eye of the Giant, Just War, Legacy, Mad Dogs and Englishmen and The Shadow of Weng-Chiang. The phrase "alternative timeline" is used in Blood Heat, The Blue Angel, Cold Fusion, The Eight Doctors, The Eyeless, Imperial Moon, The Ripple Effect, Spiral Scratch and The Temptation of Sarah Jane Smith.

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