[[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 ''[[ContinuitySnarl 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}}. 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 timeline}}s 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. 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.


* The finales of ''Anime/NeonGenesisEvangelion'' and ''TheEndOfEvangelion'' (arguably) diverge at Episode 25. ("Arguably", because in the opinions of some fans, they merely present the same events from different points of views.)
** ''RebuildOfEvangelion'', meanwhile, diverges quite considerably from TheOriginalSeries. It's especially notable in the second movie, but it starts a good deal before.
* ''DragonBallZ'' has at least three of these, where the divergences were Future Trunks and Cell time traveling. Trunks can't actually SetRightWhatOnceWentWrong in his own timeline, but he ''can'' in an alternate timeline. After warning the alternate timeline about Androids 17 and 18, he ends up staying and training in order to fight against Cell. After the Cell Games, he takes the skills he's gained in the past back to his future and kills his world's versions of the Androids, as well as Cell when he appears. Both fans and official guidebooks have also speculated on the existence of a fourth timeline. According to Cell, he killed Trunks and stole his time machine because Trunks destroyed the androids Cell was supposed to absorb. Since the Future Trunks that the series focuses on knew when Cell would appear to kill him, the Trunks who was permanently killed and had this time machine stolen must have visited a timeline where Goku didn't die of a heart disease, but Cell never surfaced and the androids were presumably defeated somehow. The most accepted theory was laid out in one of the guidebooks, that Bulma built a remote control that was used to defeat the androids there and that Trunks took it back to his future to use there, too-- since he never would have become strong enough to defeat them on his own without training for the Cell Games.
* ''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.
* ''Manga/MahouSenseiNegima'' has at least three different timelines. The first one is the BadFuture Chao Lingshen comes from, the second one at which [[spoiler:Asuna goes into an sleep for 130 years]] and it's implied to be the setting of a SpinOff series 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.
* ''MiraiNikki: Paradox''. 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, 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 ''LyricalNanoha'' continuity at the end of ''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 occured offscreen)]] of these as a result of [[spoiler:Homura Akemi trying to SetRightWhatOnceWentWrong]].
** ''Manga/PuellaMagiOrikoMagica'' confirms that there is a [[spoiler: sixth]] canon timeline.
** All the above only count those that are actually shown in series - WordOfGod states [[spoiler:Homura has reset the timeline at least 100 times.]]
* ''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]].

* The ''ComicBook/SpiderGirl'' series (and a few other less successful comics) takes place in the ''ComicBook/MarvelComics2'' universe, which diverged from the main continuity after the Clone Saga. in this continuity, [[SpiderMan Spider-Man's]] daughter survives and becomes SpiderGirl in the future.
** Or the point of divergence may be even further back, as later on it's revealed that Simon Williams (aka 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.
* One alternate Earth in the [[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.
* ''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.
* Even ''ArchieComics'' has ventured into this, with their controversial Archie Marries Veronica / Archie Marries Betty combined mini-series which became a combined regular series.

* 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 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.

* Explained in-story in ''Film/StarTrek''. The two ''Franchise/StarTrek'' timelines diverge at [[TheKirk Kirk's]] birth. In the Prime timeline, [[TheKirk Kirk]] is born on Earth and the timeline proceeds how you remember it. In the new timeline, [[TheKirk Kirk]] is born in space, his father is killed by [[BigBad Nero]], and 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 Kirks birth but became important later or that originated elsewhere wouldn't have been affected. Things like the Doomsday Machine, Giant Space Amoeba, V'Ger, Khan's sleeper ship (which is realised in ''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, 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.
* 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 [[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 the original film, possibly as described by Cornelius to the committe in ''Escape''. 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 'Battle' 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 'Beneath'. The TV series likely exists in one of these continuities somewhere, while the animated series, Planet 2001 don't, and and Rise may or may not. 'Rise' is a ContinuityReboot, but there have been statements by the PTBs 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/BackToTheFuture Back to the Future Part II]]''.
-->'''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.

* ''{{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.

[[folder:Live Action TV]]
* ''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]].
* ''Film/{{Terminator}}: Series/TheSarahConnorChronicles'' branches off from the movie continuity after ''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 ''Rise of the Machines'' were {{canon}}. ''Terminator Salvation'', 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.
* {{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.
* 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."
* ''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/{{Community}}'' episode "Remedial Chaos Theory" explores 6 alternate timelines, each different depending on which number Jeff rolls on the Yatzee 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.
* 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: Ultimtely subverted in that the patient ends up dying in both timelines.]]
* 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.
* When ''Series/{{Dallas}}'' retconned a whole season that had been unpopular with fans as AllJustADream, the producers of the SpinOff ''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.
* The ''{{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]].

[[folder:Multiple Media]]
* ''Franchise/{{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.]]
* Happens in the ''Franchise/DoctorWhoExpandedUniverse'' with the book, audio, and comics range. 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/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]]
* ''{{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''. According to ''[[AllThereInTheManual Hyrule Historia]]'', ''[[VideoGame/TheLegendOfZeldaOcarinaOfTime Ocarina of Time]]'''s history diverges at three points. In one timeline, Link defeats Ganon and goes back in time. 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, Ganon never takes over Hyrule in the first place, and is banished to the Twilight Realm because Link warned the king about his treachery after going back in time from the previously mentioned timeline.. ''[[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.
* Much of the temporal nastiness in ''VideoGame/ChronoCross'' is the result of two alternate futures clashing in the world's distant past. It's complicated.
* ''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/{{Half-Life}}'' 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.
* Surprisingly this is present in the ''Franchise/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]]. This creates a split timeline, and now the new "Iron Horde" is planning to invade the main timeline.
* In VirtuesLastReward and it's sister game Nine HoursNinePersonsNineDoors, 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 typying 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.
* The [[VideoGameRemake Remake]] of ''PokemonRubyAndSapphire'', ''Pokemon Omega Ruby and Alpha Sapphire'', outright declares a divergence point between Gen 6 and Gen 3 in its PlayableEpilogue. [[spoiler:AZ's Ultimate Weapon from ''X and Y''.]] The implication from conversations with whichever team was ''not'' the villain is that each of the various titles of the mainline series also falls under this trope; while the divergence regarding the villainous plots in Gens 3-5 are implied in the storyline,[[note]]though Gen 3's split required the aforementioned conversation to explain it,[[/note]] the divergence causing the variances in the fauna between games is not explained.

[[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 ''{{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.

[[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 {{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) spells certain doom. Luckily, only the people from the alternate timelines are doomed; the "alpha" characters will be okay.
* 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.

[[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]].