[[quoteright:348:[[Franchise/TheLegendOfZelda http://static.tvtropes.org/pmwiki/pub/images/1306701872chalkboardwhole_3558.jpg]]]]
[[caption-width-right:348:Not pictured: 60% of the series, including a ''[[RuleOfThree third]]'' alternate timeline.]]

->'''[[TheSpock Spock]]''': You are assuming that [[BigBad Nero]] knows how events are predicted to unfold. The contrary: Nero's very presence has altered the flow of history...thereby creating an entire new chain of incidents that cannot be anticipated by either party.\\
'''Uhura''': An alternate reality?\\
'''Spock''': Precisely. Whatever our lives might have been, if the time continuum was disrupted, our destinies have changed.
-->-- ''Film/StarTrek''

A specific type of AlternateContinuity in which the two continuities diverged off from a previous installment in the franchise. The two continuities are mutually exclusive, but both {{canon}} (so in a more meta sense, they're two universes within the same {{continuity}}). They share identical backstory, but the outcomes of the story in either continuity may turn out very differently.

This is often caused by TimeTravel. Unlike plain vanilla AlternateContinuity, these kinds of timelines do not necessarily happen due to AdaptationDecay or AdaptationDistillation in moving from medium to medium, but were often chosen deliberately by creators to take a franchise in a new direction while preserving the original material. This can oftentimes prevent a DorkAge. Didn't like that last installment? It was in an Alternate Timeline and really has no effect on your main franchise. Sometimes, these forked timelines can run simultaneously, each providing a different take on the franchise, its characters, and its events. The Alternate Timeline can also be employed as a kind of "soft" ContinuityReboot, creating a new universe while keeping the original in-{{canon}}. Some of these Alternate Timelines may be "What-If?" stories where one event went differently than in the main timeline, or the entire universe may be changed ForWantOfANail.

The most obvious difference between an Alternate Timeline and vanilla AlternateContinuity is that {{Alternate Timeline}}s share {{backstory}}, and were formed at a point of divergence. May result in an AlternateUniverse. If what it diverged from is RealLife, then it's AlternateHistory. In that case, [[GodwinsLawOfTimeTravel the Nazis may inexplicably win the war]]. If this ''doesn't'' happen, particularly in VideoGames with MultipleEndings, it's called "CuttingOffTheBranches". In some stories involving alternate timelines, you can FlashSideways or meet your AlternateSelf.

Compare with WhatIf, {{Elseworld}} and AlternateContinuity.



[[folder:Anime and Manga]]
%%* ''Franchise/CodeGeass'' has an alternate version of our history, wherein the American Revolution was defeated by the British Empire following Benjamin Franklin's defection to the British, while Napoleon conquered the British mainland and forced the royalty to move to America. [Belongs in AlternateHistory.]
* The finales of ''Anime/NeonGenesisEvangelion'' and ''The End of Evangelion'' (arguably) diverge at Episode 25. ("Arguably", because in the opinions of some fans, they merely present the same events from different points of views.) ''Anime/RebuildOfEvangelion'', meanwhile, diverges quite considerably from TheOriginalSeries. It's especially notable in the second movie, but it starts a good deal before.
* ''Anime/DragonBallZ'' has over a dozen of these, with three being discussed in the storyline itself (with fans and official guidebooks speculating on the existence of a fourth variant). The three "main" variants all spring from the Android Saga:
** Timeline 1 is the main ''DBZ'' timeline from the manga and anime. Future Trunks arrives and stays and trains to power up and fight against Cell in this timeline.
** Timeline 2 is where the main series' Future Trunks comes from; a world where Goku died of heart disease and the Earth is a playground for Androids #17 and #18. Eventually, Trunks is able to kill them and Cell after powering up in Timeline 1.
** Timeline 3 is apparently the timeline where Cell comes from. According to him, Trunks was going to head back in time to tell the past Z-Fighters that he had defeated the Androids. However, Cell ambushed and killed him, then used his time machine to travel back to Timeline 1. It is assumed the rest of the timeline before this event plays out the same as Timeline 2.
** The speculative Timeline 4 is based off the information gleaned from Timeline 3's Cell. It's believed that Timeline 3 Trunks traveled back to this timeline, and instead of staying and powering up, Trunks obtained and took back technical details on how to disable/shut down the Androids, which is why he was not strong enough to defeat Cell upon returning to his own time.
** In addition, ''Anime/DragonballGT'' and all of the franchise's [[NonSerialMovie Non-Serial Movies]] are stated by Toriyama himself to take place in alternate timelines.
** ''Anime/DragonBallSuper'' makes it even ''more'' confusing with the introduction of "time rings", which Gods use to time travel without creating alternate timelines. [[spoiler:Goku Black used a time ring to travel from Timeline 1 to Timeline 2 (Future Trunks' timeline) and caused havoc there, leading Future Trunks to go back to the Timeline 1 to ask for help. At the end of that storyline, Timeline 2 is destroyed by Timeline 2's Zen-O and, thanks to a lot of string-pulling by the other gods, Timeline 4 is created where Goku Black and Zamasu, the one who kicked off these events, never ran havoc in the timeline.]]
* ''Manga/MahouSenseiNegima'' has at least three different timelines. The first one is the BadFuture Chao Lingshen comes from, the second one in which [[spoiler:Asuna goes into a sleep for 130 years]] and the third timeline where [[spoiler:Asuna is brought back in time to be with her friends this time around]] and at which the epilogue takes place. The sequel ''Manga/UQHolder'' takes place in the second timeline, with glimpses at the third one.
* ''Manga/FutureDiary'':
** The SpinOff ''Paradox'' takes place in one. It actually turns out the be very important to the main timeline in the last chapter, however.
** Near the end of the main series, it's revealed that [[spoiler:the timeline the series takes place in is actually one of these. In the original timeline, Yuno was the winner of the game and became the new God of Time and Space, but since she couldn't resurrect her world's Yuki, she instead used her powers to go back in time, creating the actual timeline or "second world", killed this timeline's version of herself and took her place in the game, all in order to be with Yuki once again. In the finale, a third timeline is created when Yuno tries to go back in time once again and here all the characters manage to get a happy ending.]]
* The ''VideoGame/MagicalGirlLyricalNanohaAsPortable'' [[VideoGame game]] series splits off from the main ''Franchise/LyricalNanoha'' continuity at the end of ''Anime/MagicalGirlLyricalNanohaAs''. Here, [[spoiler:Reinforce Eins]] does not perform a HeroicSacrifice, causing HumanoidAbomination {{Evil Twin}}s of Nanoha, Fate, and Hayate to be born from the remnants of the [[spoiler:[[EldritchAbomination Darkness of the Book of Darkness]]]].
* ''Manga/FullmetalAlchemist'' did this. The [[Anime/FullMetalAlchemist first anime]] took its own storyline when it OvertookTheManga.
** OTOH, the underlying metaphysics and plot background of the [[Anime/FullMetalAlchemist first anime]] is very different from the [[Manga/FullmetalAlchemist manga]] and the Brotherhood anime based on it. So once the secrets behind the scenes come out, they are less Alternate Timeline and more AlternateUniverse.
* ''Anime/PuellaMagiMadokaMagica'' shows that there is at least [[spoiler:five (and it is implied that MANY more occurred offscreen)]] of these as a result of [[spoiler:Homura Akemi trying to SetRightWhatOnceWentWrong]].
** ''Manga/PuellaMagiOrikoMagica'' confirms that there is a [[spoiler: sixth]] canon timeline.
** ''Manga/PuellaMagiMadokaMagicaTheDifferentStory'' adds a [[spoiler: seventh]] one.
** All the above only count those that are actually shown in series - WordOfGod states [[spoiler:Homura has reset the timeline at least 100 times.]]

[[folder:Comic Books]]
* A number of Marvel's [[TheMultiverse alternate dimensions]] - typically the ones featured in the ''ComicBook/WhatIf'' comics - are implied and in some cases outright stated to be offshoots of its main Earth-616 universe. ''ComicBook/DaysOfFuturePast'', ''ComicBook/AgeOfApocalypse'', and ''ComicBook/MarvelComics2'' universe are examples.
** The ''ComicBook/SpiderGirl'' series (and a few other less successful comics) takes place in the [=MC2=] universe, which diverged from the main continuity after the Clone Saga. In this continuity, ComicBook/SpiderMan's daughter survives and becomes Spider-Girl in the future. The point of divergence may be even further back, as later on it's revealed that Simon Williams (a.k.a. Wonder Man) died in issue 9 and was never resurrected.
** Marvel tends to mess in and out of clones and alternate timelines, to the point where several characters have a modus operandi off of it.
** It was an early rule of Marvel Comics that any attempt to change history would just create an alternate timeline, which among other things is how the X-Men have so many [[BadFuture bad futures]] to choose from. Writers have tended to forget this when it's convenient.
** ''ComicBook/{{Exiles}} is all about exploring Alternate timelines with a group of original characters (for the most part). One interesting commonality about them is that typically Thor wasn't involved in them.
* One alternate Earth in the [[Franchise/TheDCU DC]] [[TheMultiverse Multiverse]] was formed soon after Jason Todd died. Franchise/{{Batman}}, stricken with grief, abandoned his ThouShaltNotKill policies and virtually eliminated crime worldwide.
** Then there's Earth-12 and Earth-50. Earth-12 is the Franchise/{{DCAU}} universe, currently in the era of WesternAnimation/BatmanBeyond. Earth-50's history diverged from the DCAU with the death of the Flash at Lex Luthor's hands, leading the Justice League to become the totalitarian Justice Lords.
* ''Comicbook/{{Flashpoint}}'' details an altered DC Universe in which only Barry Allen (Franchise/TheFlash) seems to be aware of significant differences between the regular timeline and the altered one, including Cyborg's place as the world's quintessential hero, Superman's detention by the government, and a Thomas Wayne version of Batman who spends his days "running Wayne Casinos."
* ''Franchise/{{Transformers}}'' has done this multiple times.
** The ''[[Franchise/TransformersClassics Classics]]'' continuity follows on from the end of Marvel's G1 comic, but ignores the events of [[ComicBook/TransformersGeneration2 G2]] and some(maybe all) of the UK comics. Don't ask where ''Earthforce'' fits in.
** Titan Magazines had a comic based off the [[Film/{{Transformers}} 2007 film]] which diverges from the main timeline when the Decepticons win the Battle of Mission City.
** In ''ComicBook/TransformersMoreThanMeetsTheEye'', Brainstorm's time machine is designed specifically to ''avoid'' creating one when he attempts to prevent the Autobot-Decepticon war. It doesn't quite work - while all the time travelling he and the others do follows YouAlreadyChangedThePast, Perceptor messes with the machine enough for a second timeline to come into being. In it, Megatron was never born and all the war's collateral damage is averted - at the cost of Cybertron remaining a complete dystopia where your worth is defined by your alt-mode.
* Even ''Franchise/ArchieComics'' has ventured into this, with their controversial Archie Marries Veronica / Archie Marries Betty combined mini-series which became a combined regular series.
* In the ''Magazine/DoctorWhoMagazine'' comic strip, the Eighth Doctor comic stories were initially explicitly depicted as taking place in an alternate timeline to most of the Seventh Doctor comic stories (Ace dies in a HeroicSacrifice at a point that is clearly before her character development in the Seventh Doctor stories, and the Seventh Doctor very quickly regenerates into the Eighth, with his first major story arc being his pursuit of the Threshold - all this was because a [[ExecutiveMeddling new editor]] strongly disliked the Literature/DoctorWhoNewAdventures which the Seventh Doctor comics had shared a continuity with, and [[ArmedWithCanon wanted to demonstrate that]]). However, the post-2005 stories have occasionally made continuity references to stories from both allegedly separate timelines.
* ''ComicBook/MightyMorphinPowerRangersBoomStudios'' features two timelines: a SettingUpdate of the original show, and another (revealed much later) where [[spoiler: Tommy kept working for Rita even after her spell was lifted.]] The second one is a few years ahead of the first, and has gone full BadFuture. The comic's story arc is a result of [[spoiler: evil! Tommy]] invading the regular timeline for his own reasons.
* [[Franchise/SonicTheHedgehog Dr. Ivo "Eggman" Robotnik]] as he appeared in ''ComicBook/ArchieComicsSonicTheHedgehog'' actually came from an alternate timeline where he roboticized himself to defeat Sonic. After wiping out the Freedom Fighters in his home dimension, this Robotnik became the successor of the original Robotnik, who was killed in the 50th issue. He was eventually turned back into an organic being in issue 118.

* There is a ''WesternAnimation/{{Futurama}}'' {{fanfic}} called ''[[http://www.fanfiction.net/s/4560300/1/ Green Storm Rising]]'' where the Planet Express Crew randomly shifts through two different alternate timelines.
* The ''Fanfic/PonyPOVSeries'' is established as being an Alternate Timeline to the main series timeline. While originally tied to the 'heart-world', the universe diverged completely and became independent as of 'The Last Roundup'
* In ''Fanfic/EqualAndOppositeAttraction'', there is a massive divergence where [[spoiler: Negi never stops teaching and Fate goes soul-searching]]. This kicks off the plot when Negi leaves Mahora to get his life in order.
* An [[WhatCouldHaveBeen unused idea]] for a ''Fanfic/CalvinAndHobbesTheSeries'' MadeForTVMovie chronicled the eponymous characters visiting one, where Calvin (as an adult) became rich by selling the MTM, only for a war to break out as several nations all try to use it to [[SetRightWhatOnceWentWrong change history in their favor]].
* In Fanfic/StarWarsLightInDarkTime, the series' real plot begins when Doc and Marty inadvertently get Luke and his friends to create an alternate timeline where Anakin never became Darth Vader, but Order-66 still happened. The result is an evil version of Luke, a more competent Empire, and a potentially worse galaxy.
* A defining plot point in ''FanFic/SplitSecond'', which diverges at the moment of the first sonic rainboom, in which Twilight became a WhiteMage and Sparkle became a BlackMage.
* {{Justified}} in "Fanfic/BrotherOnBrotherDaughterOnMother", which takes the approach of explaining the [[TimeyWimeyBall inconsistent behavior]] of ''Franchise/StarTrek'' TimeTravel with the notion that time is like a rope composed of alternate timelines (or more specifically sequences of probabilistically determined events) that are fundamentally similar overall, but which can fray off dramatically different timelines in the event of major temporal incursions. The TimePolice and the Temporal Prime Directive exist to prevent such frays from happening, since they damage time itself.
* In Fanfic/BloomingDreemurr, it's entirely possible to interact with timelines of previous and future resets. As they're the primary if not only means for alternate timelines, timelines are numbered based on the number of resets there have been, from 0 to 721.
* In Fanfic/TheSagesDisciple, [[spoiler: this appears to be the case for events of the mundane world, as it appears the presence of the supernatural has affected the timeline. Russia remained an absolute monarchy due to Tsar Alexander III surviving to influence the events leading up to World War I, the Yggdmillennia family prevented the outbreak of the Second Balkan War, the Titanic managed to reach New York City before sinking due to the intervention of an unnamed magus, Operation Valkyrie succeeded in 1944, etc. During the sequel "The Puppeteer's Bodyguard," Crow spends much of his free time researching other such changes and trying to figure out why its so different from the world he knew.]]

* ''Franchise/StarTrek'':
** Explained in-story in the 2009 ''Film/StarTrek'' reboot. The two main timelines diverge at Kirk's birth. In the Prime timeline, Kirk is born on Earth and the timeline proceeds how you remember it. In the new timeline, Kirk is born in space, his father is killed by [[BigBad Nero]], and [[spoiler: Vulcan is eventually destroyed]] -- so there is no point asking [[spoiler:Spock-Prime]] what's going to happen next, since now he has no idea either.
** Although his knowledge of things that predated Kirk's birth but became important later or that originated elsewhere wouldn't have necessarily been affected. Things like the Doomsday Machine, Giant Space Amoeba, [[StarTrekTheMotionPicture V'Ger]], [[spoiler: Khan's sleeper ship]] (which is realized in ''Film/StarTrekIntoDarkness'', where it is discovered several years earlier than the original timeline), the existence of the Borg and the Dominion, subspace damage caused by warp drives, [[StarTrekIVTheVoyageHome the need for whales]], and so on.
** The IDW comic series reveals that Q knows about this timeline and decides to go mess with it to teach Kirk a lesson, despite Picard begging him not to.
** In 2016, shortly before the release of ''Film/StarTrekBeyond'', this timeline got officially dubbed the "Kelvin Timeline", referring to the USS ''Kelvin'' attack as the diverging point.
* Done to the extreme in ''Film/DejaVu'', which necessitates [[http://en.wikipedia.org/wiki/File:Deja_Vu_Timeline.png 4 alternate timelines]] to explain the events of the movie.
* The ''Franchise/{{Godzilla}}'' series has done this several times to the point where each of the movies from ''Film/{{Godzilla 2000}}'' and onward (with the exception of the two with Mechagodzilla) are their own continuity branching off from the original.
* In ''Film/{{Triangle}}'', Jess gets stuck in a GroundhogDayLoop of her co-passengers getting killed by a masked killer. The first Jess tries to break the chain by meeting the Jess from the next loop. This creates a new timeline where the other passengers died differently by getting killed by a different masked killer. [[spoiler: Subverted in that the two timelines play off at the same time and each influence each other. For example the new timeline eventually causes the second Jess to have her own story, which we don't see, where she eventually killed some of the passengers as the second masked killer which eventually made the first Jess turn into the first masked killer]]
* In ''Film/SlidingDoors'', the movie shows two {{alternate timeline}}s. The story starts off with the MainCharacter getting fired, while her boyfriend is cheating on her. The MainCharacter goes home, and either just catches [[UsefulNotes/TheLondonUnderground the tube]] in time, finding her boyfriend in bed with another woman, or misses the tube, causing some other events to happen which means she arrives home after the other woman has left. The movie then alternates between the two story lines.
* It's almost certain that there are two continuities in the original ''Franchise/PlanetOfTheApes'' franchise. The first is the continuity that led to the society of [[Film/PlanetOfTheApes1968 the original film]], possibly as described by Cornelius to the committee in ''Film/EscapeFromThePlanetOfTheApes''. The second is the altered continuity that the birth of their son, Caesar, sparked. It appears that the ape revolution was greatly sped up with his arrival. However, fans are split as to whether the continuities ultimately re-merge when history reaches the point where the original film was set, and humans will again end up mute wild animals and the world destroyed by the Alpha-Omega bomb or whether history was changed for good by the end of ''Film/BattleForThePlanetOfTheApes'' and Caesar forged a new future. The editing of ''Battle'' didn't help things, the theatrical release had a hopeful tone, but the unedited version on most DVD releases clearly sets up the beginnings of the mutant society of ''Film/BeneathThePlanetOfTheApes''. [[Series/PlanetOfTheApes The TV series]] likely exists in one of these continuities somewhere, while [[WesternAnimation/ReturnToThePlanetOfTheApes the animated series]] and [[Film/PlanetOfTheApes2001 the 2001 remake]] don't, and and ''Rise'' may or may not. ''Film/RiseOfThePlanetOfTheApes'' is a ContinuityReboot, but there have been statements by the creators contradicting that and painting it as a prequel as well.
* The alternate timeline (and preventing it) make up about half of the plot of ''Film/BackToTheFuturePartII''.
-->'''Doc''': Obviously, the time continuum has been disrupted creating this new temporal event sequence, resulting in this alternate reality.\\
'''Marty''': English, Doc.\\
'''Doc''': Here, here-here. Let me illustrate.\\
''(He moves aside cardboard boxes to set up his chalkboard)''\\
'''Doc''': Imagine that this line represents time. 1985...the future...the past. Prior to this point in time, somewhere in the past, the timeline skewed into this tangent, creating an alternate 1985. Alternate to you, me, and Einstein, but reality for everyone else.
* The ''Film/XMenFilmSeries'' entered this territory after ''Film/XMenDaysOfFuturePast''. All films set after that point take place in an alternate version of Earth in which the existence of mutants became public knowledge in 1973, nearly three decades earlier than in the original timeline, meaning there are quite a few differences.
* In the ''Film/DCExtendedUniverse'', Batman witnesses a horrific BadFuture in a dream in ''Film/BatmanVSupermanDawnOfJustice'', with the forces of Apokolips dominating the Earth and Superman having turned to their side. All of this likely happened because Lois Lane died and the Justice League didn't gather. The Flash travels in time and tries to warn Bruce Wayne, who doesn't fully understand it until Superman's death at the end of the film. By the time of ''Film/{{Justice League|2017}}'', Bruce and Diana/Wonder Woman do their best to gather the eponymous SuperTeam to repel the incoming AlienInvasion by the Apokoliptian war chief Steppenwolf and spare the Earth the aforementioned BadFuture.

* ''{{Literature/Alterien}}'' features a story at a later point in the series in which Oberon and his rival, Theseus, end up in an alternate reality. In this alternate universe, many of the events of Oberon and Theseus' lives occurred similar to the way they did before, but set a century earlier and with new people in place of some of the people they remember.
* The GaryPaulsen book ''[[Literature/BriansSaga Hatchet]]'' ends with [[spoiler:Brian being rescued]]. However, in the third book, ''Brian's Winter'', [[spoiler:it takes place in an alternate series of events where Brian has to survive through the winter]]. Of course, those spoiler tags are almost useless since [[spoiler:they spoiled this on the [[LateArrivalSpoiler back of the book.]]]]
* The ''Literature/BlackTrillium'' novel was co-written by three authors, who each went on to write a {{sequel}} (or two), effectively spawning three mostly incompatible timelines from a single root.
* The book, ''Literature/TheWastelands'' of Creator/StephenKing's ''Franchise/TheDarkTower'' series involves alternate timelines created in the previous book, ''Literature/TheDrawingOfTheThree'' when [[spoiler:Roland creates a paradox by saving the life of Jake in his own world, preventing him from travelling to Roland's world, and them ever meeting.]] The alternate timelines created, [[spoiler:one where he travelled with Jake, and one where he was alone, slowly drive both Jake and Roland insane as their minds simultaneously believe both series' of events to be true.]]
* ''{{Literature/Dinoverse}}'' has a vast number of alternate universes, but it's implied that the peaceful utopian Dinoverse, which has a present-day society of, well, dinosaurs, is the result of characters in the Mesozoic era rescuing an [[AmplifiedAnimalAptitude unusually smart Deinonychus]] from certain doom. There's still the heroes' reality with human civilization, and there are human and dinosaur versions of several characters.
* ''Literature/TheRifter'': [[spoiler:Kahlil, after a lonely youth training in Rathalípesha, spent years in Nayeshi waiting to bring the Rifter (John) to Basawar; then his key to the gates fell into Johnís hands and John crossed through. He landed at an earlier point in time and met Ravishan the trainee-Kahlil; together the two of them changed history radically. Now the future where Ravishan becomes Kahlil will never happen, but his future self is still over in Nayeshi, not knowing that events he remembers have been wiped out of existence. Kahlil crosses to Bashawar and arrives thirty years after Johnís arrival. He [[NeverTheSelvesShallMeet doesnít meet himself]] because by this time Ravishan is dead. However, he does pick up Ravishanís memories; the two timelines coexist confusingly in his mind. Among other things, the Payshmura church that Kahlil remembers serving all those years doesn't exist here, it was destroyed soon after John's arrival.]]
* One of the many things that the main characters in the ''Literature/SixteenthirtyTwo'' series bemoan is that so many great artists and musicians born ''after'' the arrival of Grantville in the past will now never be born because the timeline has diverged way too far for probability to allow it. This fact causes several artists and musicians native to the time to investigate what ''would'' have been created by those now-erased artists and create it themselves.
* The entire series ''Literature/{{Relativity}}'' apparently takes place in an "alternate timeline." In the short story "Tempest" (which takes place in the distant past, relative to the main narrative), Phanthro alters history, and uses a memory-projector to show a version of history where Matt's son dies in his forties. Since his son dies as a child in the "current" history, the memories Phanthro has must be from an "earlier" version.
* In Creator/OrsonScottCard's ''Literature/PastwatchTheRedemptionOfChristopherColumbus'', the historians of the titular organization try to figure out if it's possible to change the past to avert TheEndOfTheWorldAsWeKnowIt, only to discover that it has already been done once. It's heavily implied that our timeline is the alternate to what was supposed to have happened originally. In the original timeline, Columbus never sailed West, instead leading a new, disastrous, Crusade to retake the Holy Land. Without European interference, the Aztec Empire fell under the onslaught of Tlaxcala, a rival nation (in our history, they allied with the Spaniards to destroy the Aztecs). Unlike the Aztecs, the Tlaxcalans were not averse to innovation and were even more bloodthirsty. They forged an even greater empire, by the time the Americas are finally visited by Europeans in the 18th century. The captured Portuguese sailors were forced to give up the secrets of gunpowder and shipbuilding, after which the the Tlaxcalans built a massive armada and sailed East. They fell upon a devastated Europe, crushing all enemies and sacrificing thousands to their god of war. However, that original timeline was also doomed to result in the end of human civilization, so scientists from that timeline sent back a holographic message to Columbus, pretending to be God telling him to sail West, resulting in our timeline. Realizing that both versions of history are dead ends, the Pastwatch historians send three people into the past around the time of Columbus's arrival to the New World. One sacrifices himself to trap the Europeans in the Caribbean, another convinces Columbus to work on unifying the island tribes, and the third starts forming a more benevolent empire on the mainland. Many decades later, Columbus returns to Europe at the head of a massive well-armed fleet of trade ships as both an example of GunboatDiplomacy and an offer for the Old World to trade fairly with the New World with neither culture dominating the other. Supposedly, this results in a much better timeline.

[[folder:Live Action TV]]
* The ''Series/{{Community}}'' episode "Remedial Chaos Theory" explores 6 alternate timelines, each different depending on which number Jeff rolls on the Yahtzee die. We then see the main timeline, which is [[spoiler: where Abed catches the die instead of letting it roll.]]
** The series flashes over to the "Darkest Timeline" every now and then to see how things are going (or at least ''Abed'' does in his own mind).
** The episode with the two model U.N.s also used this explanation (at Abed's insistence) to explain the presence of two Earth's each with their own U.N.. Ultimately, it's integral to how the study group wins the competition.
* When ''Series/{{Dallas}}'' retconned a whole season that had been unpopular with fans as AllJustADream, the producers of the SpinOff ''Series/KnotsLanding'' didn't want to retcon plots that had been influenced by events in that season, causing the show to split off as an Alternate Timeline.
* ''Series/DoctorWho'': [[Recap/DoctorWhoS30E11TurnLeft "Turn Left"]] shows what would happen if Donna took a different job offer some time before meeting the Doctor. She never would've gotten involved in the Racnoss plot and not been there to keep the Doctor from going too far and dying under the Thames. Then it goes FromBadToWorse, as the Doctor's absence causes every single crisis he prevented to take place, sometimes even worse (e.g. the Adipose end up killing millions in the US, while the starliner ''Titanic'' ends up wiping out London). At the end of the episode, Donna is convinced by Rose to put events back on the right track.
** The events of [[Recap/DoctorWhoS31E12ThePandoricaOpens The Pandorica Opens]] and [[Recap/DoctorWhoS31E13TheBigBang The Big Bang]] end up triggering a Total Event Collapse, where ''all of reality'' aside from the Earth, Moon, and everyone on it [[CosmicRetcon are erased from existence across every point in time]]. Species that were at the heart of the collapse but not from Earth were preserved as statues; small impressions on the universe. Stars no longer exist, including the sun, but the TARDIS manages to keep the Earth warm by containing its explosion in a GroundhogDayLoop across all of time as well. This allows humanity to develop, though they see stars as just a myth. [[FantasticReligiousWeirdness Aside from Richard Dawkins, who runs a "star cult."]]
* {{Lampshaded}} in ''Series/{{Eureka}}'', where Henry explains to Sheriff Carter ''exactly'' why they can't accurately predict the future after [[spoiler: hitting the ResetButton on the past five years to undo Henry meddling to keep his wife from dying in the past]], since the differing actions alone will cause a RippleEffect to make the timelines gradually diverge. And then something different happens.
** It should be noted that ''Eureka'' has gotten ''two'' Alternate Timeline treatments. The first one (mentioned above) only lasted an episode before being reverted; the second one, however, became the permanent timeline for the show.
* A few later episodes of ''Series/{{Farscape}}'' see John Crichton exploring a few of these, particularly as interdimensional wormholes and the associated wibblie-wobblies become more important to the plot.
* It's eventually revealed that the entirety of ''Series/TheFlash2014'' takes place in an AlternateTimeline created by [[spoiler:the Reverse-Flash]] going back in time to kill Barry as a child. When Barry saves his past self, the villain kills Barry's mother in a fit of rage. Barry's father is arrested for the murder, and Barry ends up being raised by Detective Joe West. The villain further messes with the timeline after discovering that he is stuck there and does everything possible to try to return to his own time, including [[spoiler:re-creating the Flash]]. By extension, this also means that ''Series/{{Arrow}}'' also takes place in an alternate timeline.
** Season Three begins right on the heels of [[spoiler: Barry going back in time to prevent his mother's murder.]] The result is the series' answer to Flashpoint: Barry lives a normal life with his parents, with Wally West as the Flash with the Rival serving as his speedster nemesis. However, Barry's old adopted father is now a washed-up drunk, his old tech support are now a children's eye doctor and self-centred billionaire, and the more he uses his speed, the more he forgets his old life. In the end, after getting one of the above mortally wounded, he goes back again to make a CloseEnoughTimeline. Now, the only differences are that Cisco resents him for his brother's death, Joe West and Iris haven't talked for the past year, and he's had a co-worker for the past year who hates his guts. He almost goes back to reset this timeline too, before [[spoiler:Jay Garrick]] yanks him out for a lecturing.
* ''Series/{{Frasier}}'' did an episode that was in fact inspired by the movie ''Film/SlidingDoors''.
* The fourth season of ''Series/{{Fringe}}'' takes place in an Alternate Timeline, one in which Peter Bishop was never saved by the Observer as a boy. The first four episodes explore [[ForWantOfANail all the changes to the continuity, big and small, that resulted from Peter not being around]]. And then the Peter from the original timeline returns. This is all in a series that spent three years knee-deep in the complexities of an AlternateUniverse.
** It's also worth noting that, according to the time-sensitive Observers, the first three seasons ''already'' took place in an Alternate Timeline that was thrown off-course from what was ''supposed'' to happen by the actions of an Observer. The Alternate Timeline of season 4 is probably a lot closer to how the original timeline was supposed to run.
* The ''Series/MalcolmInTheMiddle'' episode ''Bowling'' played with this, the divergence being which parent took the kids bowling instead of staying at home. The conclusion?
--> '''Lois''' / '''Hal''': "Next time, you take 'em."
* Happens several times in ''Series/{{Misfits}}'':
** The first instance is when Curtis first discovers his MentalTimeTravel powers. When the storm turns the probation worker crazy and he attacks Kelly, the rest of the gang doesn't believe her until he comes in the door and kills her in front of them. Curtis travels back to right before he comes in and warns the gang.
** In another episode, he decides to try to use his power to stop himself and his ex-girlfriend from getting caught with cocaine in the first place. He manages to do so but this event causes the deaths of all of the other Misfits except Nathan ([[spoiler: probably because of his immortality]]) because he isn't there to see the potential future. He ends up creating a CloseEnoughTimeline in which he does end up on community service but his girlfriend doesn't get arrested.
** In a season 3 episode, an old man [[spoiler: buys Curtis' power from Seth]] in order to go back in time and [[HitlersTimeTravelExemptionAct kill Hitler]]. He fails, but he leaves behind his 2011 cell phone which leads to a future where Nazi Germany was able to use that technology to win the war and take over the UK.
** In the SeriesFinale, Jess is taken forward a year by some guy she meets in a bar, to a future in which she has a baby with this man.
* The ''Series/{{Psych}}'' episode "Right Turn or Left for Dead" features an alternate timeline that diverges with [[spoiler: Shawn giving Juliet Chief Vick's shawl instead of his jacket, thus preventing their break-up in the previous episode.]] Shawn ends up working the same case in both timelines, but the differences bring clues to light at different times. Near the end of the episode, [[spoiler: the alternate timeline is revealed to be AllJustADream of Shawn's]].
* The ''Series/{{Scrubs}}'' episode ''My Butterfly'', where the cast explored what different events resulted from a butterfly landing on an attractive woman's chest or alternatively, an unattractive man's chest. [[spoiler: Ultimately subverted in that the patient ends up dying in both timelines.]]
* ''Franchise/StarTrek'' has had many episodes in all five series featuring alternate timelines. For more information, [[http://en.memory-alpha.org/wiki/Alternate_timeline click here]].
* ''Series/TerminatorTheSarahConnorChronicles'' branches off from the movie continuity after ''[[Film/Terminator2JudgmentDay T2: Judgment Day]]'' - Sarah and John Connor leap through time from 1999 to 2007, skipping [[spoiler:Sarah's death from cancer in 2002]] and the date at which Judgement Day ''would'' have happened if ''[[Film/Terminator3RiseOfTheMachines Rise of the Machines]]'' were {{canon}}. ''Film/TerminatorSalvation'', on the other hand, carries on from the ''Rise of the Machines'' continuity.
** Well, for a series with that much TimeTravel, it's a wonder it didn't develop [[AlternateContinuity alternate continuities]] sooner.
** Two characters who have been sent back to the past at different times find out that their versions of the future don't exactly match, implying that they come from different timelines.
** The show ends on a CliffHanger and yet another timeline caused by John Connor traveling to the BadFuture, partly caused by him not being there to lead the resistance.
* Naturally, some episodes of ''Series/{{Timecop}}'' have this happen. In one episode, a criminal messes up Jack's personal history, causing their roles to reverse (i.e. the criminal is now a timecop, while Jack is a known felon). In another, a neo-Nazi travels back in time to UsefulNotes/WorldWarII and helps them win. He's smart enough to dress a local as himself and set up events to look like he is accidentally killed by the Nazis. Satisfied, Jack returns home only to find a different timeline. It's not explored, since he immediately jumps back to fix it.
* ''Series/{{Timeless}}'': A major plot point of the pilot episode, where despite attempts to keep from altering history, the ''Hindenburg'' explodes a day later, destroyed by a group of "renegade terrorists" (the main characters), with only two victims. [[spoiler:After they get back, Lucy finds her mother, who was comatose before perfectly fine, she's engaged, and her sister never existed. ]]
* ''Series/KamenRiderRyuki'': Since the overall plot of the series is that [[spoiler:BigBad Shiro Kanzaki is looping time over and over in an attempt to [[TragicVillain save the life of his sister Yui]]]], the movie ''Episode Final'' and the TV special ''13 Riders'' are the events of different timelines rather than simply being [[AlternateContinuity Alternate Continuities]] like most ''Kamen Rider'' {{Non Serial Movie}}s.

[[folder:Multiple Media]]
* ''Toys/{{BIONICLE}}'' had at least four different parallel timelines. For instance, in ''Dark Mirror'', Takua was killed by a Toa of Iron, and in ''The Kingdom'' universe, as well as the universe briefly seen at the end of ''Brothers in Arms'', he never became a Toa at all. He is a Toa in the main universe.
* ''Franchise/StarTrek'' has been indulging in a "Myriad Universes" series of books and comics which explores countless other realities throughout every ''Star Trek'' series, based on various differences in their timelines. Some vary hugely from the original, while others vary in [[InSpiteOfANail slightly simpler ways]]. There's also the original MirrorUniverse.
** One is the ''Last Generation'' comic. Set in a universe ruled by the Klingon empire after a plot change during ''The Undiscovered Country'' (i.e. Kirk wasn't [[ForWantOfANail fast enough to save the president]], [[spoiler:and it's all Captain Braxton's fault]]). In this Dystopian version of the Trekverse, Sulu captains the last remaining Star Fleet vessel as a MysteriousProtector, Tasha lives, Jean-Luc Picard [[LaResistance leads a Resistance movement]], [[CreatorsPet Wesley]] took [[TookALevelInBadass a few levels in badass]] (well, physical prowess, anyway) and Data is the [[MacGuffin key to changing history.]] Either that or he's the [[SaveThisPersonSaveTheWorld key to the most destructive computer weapons system ever created.]]
* Different portions of the ''Franchise/DoctorWhoExpandedUniverse'' in different media may or may not take place in different timelines - there are various claims in-universe about this, some of them mutually contradictory. Some people will try to place them in the same continuity. However in the MilestoneCelebration of ''AudioPlay/BigFinishDoctorWho'' for the 40th anniversary "Zagreus", the Doctor claims the events in other continuities happen in other Universes, which is the line TV Tropes has taken.

[[folder:Role Playing Games]]
* In ''Roleplay/AlphaTeamMissionDeepFreezeRPG'', Future Frozeen created an alternate timeline by going back and time and changing the past, with the point of divergence being Mission Deep Freeze when he rescued the rest of Alpha Team from the assassin robot that killed them in the original timeline.
* In ''Roleplay/DinoAttackRPG'', the Future Villains created an alternate timeline by going back in time and changing the past, with the point of divergence being the early Dino Attack when they joined forces with their past selves.

* ''Theatre/HarryPotterAndTheCursedChild'' has two different Alternate Timelines, both created by the protagonists' use of TimeTravel to attempt to SetRightWhatOnceWentWrong.
** In the first, they inadvertently change Hermione and Ron's relationship so that the two never marry, causing the erasure of Albus's cousins and drastically altering the personalities of both Hermione and Ron.
** In the second, they technically accomplish their goal by preventing Cedric Diggory's death. Instead, Diggory's humiliation leads to him joining the Death Eaters and killing Neville Longbottom, which ensures Voldemort's survival.
** The surprise antagonist of the story then attempts to create yet a third Alternate Timeline while the protagonists are attempting to undo their own changes. The protagonists stop her and eventually wind up with a CloseEnoughTimeline.
* The Madness Musical; ''Our House'', has the Lead Character breaking in to a development site, so he can get a view of his Neighbourhood, but then the Police arrive. It then shows two time lines, one where he turns himself in, another where he runs, showing the consequence of both choices, while his father watches and makes commentary on his choices. [[spoiler: It then shows a third time line, where he doesní break in to the development site, in the first place]]?
* ''Theatre/IfThen'' follows the main character Elizabeth down two separate timelines, depending on which friend and which activity she chooses to go with at the start of the play. Amusingly, the play is then filled to the brim with more choices, much weightier than the one made at the start, that would seem to be fodder for creating yet more timelines, but these are not explored, despite hints that more such timelines do exist.

[[folder:Tabletop RPG]]
* ''TabletopGame/{{Twilight 2000}}'' invented an alternate setup for WorldWarIII after TheGreatPoliticsMessUp which had Germany start the war instead of the Soviet Union. This one is a bit of FanonDiscontinuity.

[[folder:Video Games]]
* ''Franchise/TheLegendOfZelda''. In trying to figure out the ContinuitySnarl of the series chronology, one popular fan theory said that the use of TimeTravel in ''VideoGame/TheLegendOfZeldaOcarinaOfTime'' caused the series to split into two different timelines. ''Literature/HyruleHistoria'' later canonized this concept, except that there are now ''three'' timelines:
** In one timeline, Link defeats Ganon and goes back in time to his childhood. Then, [[BigBad Ganon]] rises again, causing Hyrule to be flooded. ''[[VideoGame/TheLegendOfZeldaTheWindWaker The Wind Waker]]'', ''[[VideoGame/TheLegendOfZeldaPhantomHourglass Phantom Hourglass]]'' and ''[[VideoGame/TheLegendOfZeldaSpiritTracks Spirit Tracks]]'' follow this timeline.
** In another timeline, young Link uses his knowledge from the first timeline to warn the king, preventing Ganon from taking over Hyrule in the first place and causing him to be banished to the Twilight Realm. ''[[VideoGame/TheLegendOfZeldaMajorasMask Majora's Mask]]'', ''[[VideoGame/TheLegendOfZeldaTwilightPrincess Twilight Princess]]'' and ''[[VideoGame/TheLegendOfZeldaFourSwordsAdventures Four Swords Adventures]]'' take place in this timeline.
** In the third timeline, Link is killed in battle by Ganon, causing the Imprisoning War. ''[[VideoGame/TheLegendOfZeldaALinkToThePast A Link to the Past]]'', the ''[[VideoGame/TheLegendOfZeldaOracleGames Oracle]]'' games, ''[[VideoGame/TheLegendOfZeldaLinksAwakening Link's Awakening]]'', ''[[VideoGame/TheLegendOfZeldaALinkBetweenWorlds A Link Between Worlds]]'', the original ''[[VideoGame/TheLegendOfZelda Zelda]]'' and ''VideoGame/ZeldaIITheAdventureOfLink'' take place in this timeline.
* ''Franchise/MortalKombat''. The original timeline shows Raiden and Shao Kahn as the final 2 Kombatants, with Kahn defeating Raiden. Knowing that he is about to be killed, Raiden sent a message of ''[[VideoGame/MortalKombat9 his past self]]'' to hopefully change the future. The current timeline, while still near-identical to the original, [[spoiler:finally [[KilledOffForReal kills Shao Kahn for good]]. Unfortunately, the new decisions made and results [[PyrrhicVictory cost the lives of a lot of kombatants]], [[VideoGame/MortalKombatX made both Earthrealm and Outworld more vulnerable for attack]], and later on [[TheCorruption placed Raiden to a much darker state after Shinnok's defeat]].]]
* ''VideoGame/ChronoCross'' initially seems to revolve around DualWorldGameplay where the key difference the Home World and Another World comes down to whether Serge survived his childhood, but as the plot unfolds it turns out that a lot of what is going on is being influenced by the potential timelines created over the course of ''VideoGame/ChronoTrigger''. One faction is from the good future resulting from that game, a high-tech civilization trying to prevent any {{Temporal Paradox}}es that might threaten its future existence, while a rival faction hails from a timeline in which humanity never rose to dominate the planet, and wants to cleanse the world of us filthy usurpers. And then there's a TimeCrash where ''Chrono Trigger'''s BadFuture is trying to reassert itself, with dire consequences for everyone.
* ''VideoGame/DarkCloud'' and its sequel. [[spoiler:The first game created a different timeline entirely by stopping the Dark Genie from ever coming to existence. The second game was mostly about this, you had to restore Origin Points (Event in past which influences future), it even creates new innovations in the future such as Aeroharmonic technology and Paznos' Colossus Mode which never existed before.]]
* The main premise of the ''VideoGame/HalfLife'' mod series "Timeline." Rogue Black Mesa scientists have discovered how to use the dimensional portals to permit time travel, and have been messing with and creating new timelines. Eventually this technology falls into the hands of ThoseWackyNazis...
* The ''VideoGame/MegaManClassic'' metaseries has one, expanded on in ''VideoGame/MegaManBattleNetwork''. Both Doctors Light and Wily presented their research to the government: network and robotics, respectively. In the world where Light's network research won out, the ''Battle Network'' and ''VideoGame/MegaManStarForce'' games take place. However, when Wily's robotics were chosen instead, it led to the other series.
* ''VideoGame/GhostTrick'' has an in-game instance: the first timeline is a BadFuture where [[spoiler:everybody dies, Missile is unable to save them due to lacking the needed ghost tricks, and Sissel refuses to help Missile due to only being concerned about his own quest for identity. At the end, Missile uses Yomiel's no-longer-immortal body to travel back in time 10 years to the Tesmik Park incident and [[TheSlowPath wait out those ten years until that night returns]]]]. Then starts the second timeline, [[spoiler:which is the Bad Future again, but diverging when Sissel awakens and Missile from the first timeline guides him under the guise of Ray, making Sissel think he's a blond-haired man in red instead, so that he'll naturally save Lynne and everyone else that could be a lead in his quest for identity due to said man's interactions with them]]. The third timeline begins [[spoiler:after Sissel, Missile from the second timeline, Yomiel, and Detective Jowd go back 10 years again like the original Missile did and SetRightWhatOnceWentWrong by saving Yomiel's life and thus preventing his StartOfDarkness]], undoing the first two timelines [[spoiler:[[RetGone and the first Missile's existence]]]] in the process.
* ''VideoGame/TheBabylonProject'' campaign "The Earth-Brakiri War" is set in an alternate 2260 where Series/BabylonFive had been destroyed and Earth had alienated itself from the other races due to a failure of diplomacy.
* The existence of one of these and the desire of certain [[EldritchAbomination odd]] [[OmnicidalManiac factions]] to bring it back fuels the plot of ''Videogame/{{Persona 2}}: Eternal Punishment''.
* You see two of these in ''VideoGame/ShinMegamiTenseiIV'': Blasted Tokyo and Infernal Tokyo. Both are horrible {{Death World}}s; it's just that they embody what would have ultimately happened if certain events in the past had swayed the balance in favor of one faction or the other.
** The spin-off ''VideoGame/ShinMegamiTenseiIVApocalypse'' is itself set in an alternate timeline to the original game's Neutral route. Specifically, this is the result of [[PlayerCharacter Nanashi]] coming back from the dead with the help of the god Dagda, which, long story short, leads to the unsealing of the Divine Powers and some other drastic things happening to and around Tokyo. It's implied that if Nanashi refuses to be revived (which can actually be done at the start of the game for a NonStandardGameOver), ''IV''[='=]s Neutral ending continues on as usual.
* Surprisingly this is present in the ''VideoGame/MetalGear'' series: ''VideoGame/MetalGearGhostBabel'' takes place in an alternate timeline where neither the events of the second game nor the events of the Solid series have taken place.
* In ''VideoGame/SuperRobotWarsReversal'', the OriginalGeneration characters come from a BadFuture where the events of ''Anime/MobileSuitGundamCharsCounterattack'' and ''Anime/MartianSuccessorNadesico: The Prince of Darkness'' play out. After accidentally [[TimeTravel traveling back in time]], they unintentionally SetRightWhatOnceWentWrong by keeping the events of ''Anime/MobileSuitGundamWingEndlessWaltz'' from going bad, which makes everything better for everyone invovled.
* ''VideoGame/TheHalloweenHack'' takes place after Earthbound. This time, the Chosen Four didn't return since they were sent to a timeline created when Giygas was killed in the past. Andonuts went mad with grief and became a serial killer because he thought he killed them.
* ''VideoGame/DragonBallXenoverse'' takes place in an alternate timeline from the main ''Dragon Ball'' series, created as a result of [[BigBad Towa and Mira]] [[MakeWrongWhatOnceWentRight interfering with time and changing the outcomes of key battles]] (allowing Raditz to evade an otherwise fatal attack from Piccolo, just to name one example). It is up to the player and an alternate future version of Trunks to SetRightWhatOnceWentWrong and correct the changes being made in history.
* The plot for ''VideoGame/WorldOfWarcraft's'' fifth expansion, ''Warlords of Draenor'', is kicked off by Garrosh going back in time 35 years to Draenor (the world the orcs come from) and [[GivingRadioToTheRomans introducing Azeroth's modern vaguely steampunk technology to the hunter-gatherer orcs]]. Subverted in that there are already differences before he gets there, like Ner'zhul's wife still being alive when she died in our timeline, and Garrosh himself not existing in this timeline - Grom's wife died before Garrosh was born here. Kairoz (the bronze dragon who helped Garrosh get there) even tells him that it is not his Draenor, just one that is similar enough for their purposes. Garrosh's arrival did still change things more though.
* Implied by the OneGameForThePriceOfTwo nature of the ''Franchise/{{Pokemon}}'' franchise, with each version having differences in the Pokemon you can catch. Since Gen III, these divergences expanded to include which evil team you fight or the legendary Pokemon that is the focal point of the story. Gen V took it a step further and had the Unova region be more old-fashioned in ''White'' and more modern in ''Black''.[[note]]Opelucid City in particular has an NPC who explicitly references "another Opelucid".[[/note]] References to alternate timelines actually became a part of the story starting in Gen VI's [[VideoGameRemake remake]] of ''VideoGame/PokemonRubyAndSapphire'', ''Pokemon Omega Ruby and Alpha Sapphire'', where the PlayableEpilogue has the character Zinnia establish that [[spoiler:AZ's Ultimate Weapon from ''[[VideoGame/PokemonXAndY X and Y]]'']] was never created in the universe of prior generations, splitting the overarching timeline into Non-Mega and Mega versions. Gen VII's ''[[PokemonSunAndMoon Sun and Moon]]'' has the player meet [[spoiler:(former) Frontier Brain Anabel and Looker, [[TrappedInAnotherWorld who both hail from the original non-Mega timeline]],]] as part of the post-game, in addition to giving the player the ability to use wormholes to travel to the parallel timeline of the other version after capturing their game's version legendary. ''[[PokemonUltraSunAndUltraMoon Ultra Sun and Ultra Moon]]'' is straightforward about all the games in the series being part of an ''infinite multiverse'' by having its post-game revolve around Team Rainbow Rocket, a VillainTeamUp of every previous antagonist in the series, with said villains hailing from alternate worlds where TheBadGuyWins due to their respective player characters not even existing.[[note]][[https://www.youtube.com/watch?v=BIvbvl1nxhc These]] [[https://www.youtube.com/watch?v=ORnRV9gGxo0 videos]] covers the current timeline for the main games up to ''Sun and Moon''.[[/note]]
* ''VideoGame/TalesOfDestiny2'': There are [[spoiler: three]] of them. Nanaly hails from a BadFuture, Kyle and Loni hail from the original timeline, Judas was [[spoiler: resurrected from a point 18 years in the past]] and Harold is from the origin point of two of them, 2000 years in the past.
* In ''VideoGame/FinalFantasyXIII2'' the protagonists have the ability to navigate to various points in the their world's timeline. In some cases their interactions create alternate realities that they can travel between freely. For example, 'Academia 400 AF' and 'Academia 4XX AF' are alternate timeline versions of the same location in the same time period.
* ''VideoGame/WolfensteinTheNewOrder'' is set in a timeline where at some point in 1942, the Nazis got hold of a cache of hyper-advanced technology and consequently reversed-engineered it and used it to {{Curb Stomp|Battle}} the Allies into submission and TakeOverTheWorld. This becomes extremely ironic considering that [[spoiler:the technology was developed by a sect of Jewish scientists who all took a binding vow to God that they would never apply their technology to real life and just use it to help scientists make even more advanced technology with the sole intent to understand the universe better. This means that the Nazis owe their completely ill-begotten victory to a philosophy that they (wrongly) label as inferior]].
* The news broadcasts in ''VideoGame/DevilSummoner'' establish this series as an alternate timeline from ''VideoGame/ShinMegamiTenseiI'' and onward. The divergence here is twofold; [[ArcVillain Gotou]] is arrested before he can even attempt his military coup d'etat, and Thorman dies of a heart attack, and so is never able to [[spoiler:call in the nukes on Tokyo]].

[[folder:Visual Novels]]
* This becomes important in later stories in the ''VisualNovel/{{Demonbane}}'' franchise: ''all'' of the first game's endings are canon and did happen in one timeline or another. One of the prequel novels also involves Nyarlathotep erasing a timeline from existence when things in it go catastrophically wrong for everyone (including itself). Finally, at the climax of the second game, [[spoiler:Demonbane summons alternate versions of itself from an infinite number of alternate timelines to deal the finishing blow against the Clockwork Phantom... some of these variations are only slightly different, some are ''radically'' different.]]
* The Franchise/{{Nasuverse}} explicitly has alternate timelines, which handily provides an explanation for all the different routes and endings in its various media: all of them happened in ''some'' timeline or another, thus all of them are canon. The magus Zelretch possesses the "Second Magic", which allows him to travel between alternate realities, and this sometimes becomes a plot point. Somewhat like the ''Demonbane'' example above, in the final battle of the Heaven's Feel route of ''VisualNovel/FateStayNight'' [[spoiler:Rin is able to defeat Sakura and her infinite army of Shadow Giants by using a copy of Zelretch's Jeweled Sword to call upon the Second Magic, drawing infinite mana from infinite alternate timelines (one of which is noted to have ended in her defeat at Sakura's hands, in fact) to destroy all of the Shadow Giants.]]
* The premise behind ''VisualNovel/AreaX'', which deals with TimeTravelRomance without ''actual'' time travel, as the protagonist is hopping to AlternateTimelines rather than the strict past. [[spoiler:They were created when, back in the Middle Ages, Livan tried to rewrite the world to save her life, thus splitting time into multiple streams.]]
* ''VisualNovel/SteinsGate'' is actually mostly about getting out of the so called Alpha timeline(s) and back into the original but so called Beta timeline(s). [[spoiler: In the end they will get the possibility of the third timeline "behind the steins-gate]].
* In ''VisualNovel/VirtuesLastReward'' and its prequel game ''VisualNovel/NineHoursNinePersonsNineDoors'', this is pretty much the basis for how [[spoiler:Phi, Junpei and Sigma are able to know information they can't know. The games work on the multiple world theory, in which every single difference in action, human or otherwise, creates another branching universe. All three of them are able to "know" information, and obtain the same memories that their alternative counterparts in different histories obtained at the same time-frame within their respective universes [e.g, at 3PM on the same day]. It's revealed in Virtue's Last Reward that the reason for this is that they subconsciously perform "universe jumps" where their mind alone is transferred into the mind of another version of themselves from another timeline/universe. They then, subconsciously "recall" events and information that they experienced in other timelines. This often results in Sigma and Phi blurting out information that they shouldn't know, of which they don't even know where they got it from. For example, Sigma Sporadically finds himself typeing in correct login to a computer, because in a number of alternative histories he was told what the login was.]]
** This is pretty much what the entire point of [[spoiler:Nonary Game: Ambidex Edition was. To send Sigma and Phi's consciousnesses back through time, to create an alternative history where the world wasn't torn apart by a viral infection.]]
** This can also apply to the games themselves from the player's viewpoint, since games are all about multiple paths and choices affecting what timeline you go down.

[[folder:Web Comics]]
* With a twist when it comes to ''Webcomic/TwoEvilScientists'': Two super villains from alternate timelines are competing to make their timelines a reality, as well as Quint and the Time Skimmer.
* In ''Webcomic/{{Homestuck}}'', creating an alternate timeline that contradicts information known [[MindScrew in any future time that is also technically the present]] (effectively, defying a predetermined future event) turns your timeline into a doomed offshoot of the "alpha" timeline, the one that's supposed to happen. Luckily, only the people from the alternate timelines are doomed; the "alpha" characters will be okay.
** At least, until John [[spoiler: gains the power to redefine which timeline becomes the Alpha timeline at the cost of all his other selves.]]
* The Wraith in ''Webcomic/CharbyTheVampirate'' is [[spoiler: Zeno]] from an alternate timeline. Several of the other cabinmates fates in this alternate timeline have been briefly explained and illustrated on the artist's tumblr.
* In ''Webcomic/AllNightLaundry'', there's at least thirteen different timelines. We only see one though.

[[folder:Web Original]]
* ''Literature/{{Worm}}'' takes place on Earth Bet, which diverged from our timeline in 1982 with the appearance of Scion, the first {{superhero}}. [[AnotherDimension Other worlds]] exist with their own divergent timelines -- Earth Aleph being one.
* John Titor, a person claiming to be a time traveler from 2036 on several message boards, had many predictions for the future. These included a [[DividedStatesOfAmerica second American civil war]] in 2004, followed by a swift WorldWarIII in 2015, where a nuclear exchange between Russia, America, the European Union, and China killed 3 billion people. Obviously, none of this happened, but Titor also stated that the many-worlds theory of quantum mechanics had been proven to be true and our world might not go down the exact same path as the one they came from.

[[folder:Western Animation]]
* In the ''WesternAnimation/SouthPark'' Episode "Go God Go!", Cartman uses a phone that can call homes in other time periods, even the commercial for it states that it is only for prank phone calls.
* The end of ''WesternAnimation/ScoobyDooMysteryIncorporated'' has the Gang force history to reset itself in a much more pleasant direction after Scooby kills the Nibiru Entity. [[MissionControl Harlan Ellison]] tells them that this isn't the first time that they've had their timeline rebooted either.
* The ''WesternAnimation/AdventureTime'' episodes "Finn the Human" and "Jake the Dog" deal with this. Finn makes a wish that [[EldritchAbomination the Lich]] never existed. We then see an alternate world where Marceline never became a vampire, Simon stopped the nuke which irradiated the world, and Finn is living with his poverty stricken family and normal-bulldog Jake. Eventually [[spoiler: Finn ends up donning the Ice King's crown, causing the nuke to blow up and has a different Lich be born out of Jake]].
* In the ''WesternAnimation/TeenageMutantNinjaTurtles1987'' episode "Shredderville", the Turtles thought they have somehow stepped into an alternate timeline/world/reality where the Turtles never existed, in which Shredder has taken over the world, Rocksteady and Bebop are still humans, April O'Neil and Irma are their servants, and humans and mutants are mutual enemies because of Krang and his Dimension X allies. Oh, and on top of all this, everything in that world is falling apart. Fortunately, the whole thing turns out to be AllJustADream.