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Parallel universes in fiction

A parallel universe, also known as an alternate universe, parallel world, parallel dimension, alternate reality, or alternative dimension, is a hypothetical self-contained layer or plane of existence, co-existing with one's own. While the six terms are generally synonymous and can be used interchangeably in most cases, there is sometimes an additional connotation implied with the term "alternate universe/reality" that implies that the reality is a variant of our own, with some overlap with the similarly named alternate history.

Not to be confused with Parallel novel.

The sum of all potential parallel universes that constitute reality is often called a/the "multiverse".


Fiction has long borrowed an idea of "another world" from myth, legend and religion. Heaven, Hell, Olympus, and Valhalla are all "alternative universes" different from the familiar material realm. Plato reflected deeply on parallel realities, resulting in the worlds of Platonism, in which the upper reality is perfect while the lower (earthly) reality is an imperfect shadow of the heavenly equivalent.


The concept is also found in ancient Hindu mythology, in texts such as the Puranas, which expressed an infinite number of universes, each with its own gods. Similarly in Persian literature, "The Adventures of Bulukiya" (a tale in the One Thousand and One Nights) describes the protagonist Bulukiya learning of alternative worlds/universes that are similar to but still distinct from his own.[1]


One of the first science-fiction examples is Murray Leinster's short story Sidewise in Time, published in 1934, in which portions of alternative universes replace corresponding geographical regions in this universe. Sidewise in Time analogizes time to the geographic coordinate system, with travel along latitude corresponding to time travel moving through past, present and future, and travel along longitude corresponding to travel perpendicular to time and to other realities - hence the name of the story. Thus, another common term for a parallel universe is "another dimension", stemming from the idea that if the 4th dimension is time, the 5th dimension—a direction at a right angle to the fourth—is a direction into any of the alternate 3D realities.


In modern literature, parallel universes can serve two main purposes: to allow stories with elements that would ordinarily violate the laws of nature; and to serve as a starting point for speculative fiction, asking the question "What if [event] turned out differently?". Examples of the former include Terry Pratchett's Discworld and C. S. Lewis's The Chronicles of Narnia, while examples of the latter include Harry Turtledove's Worldwar series.


A parallel universe—or more specifically, continued interaction between a parallel universe and our own—may serve as a central plot-point, or it may simply be mentioned and quickly dismissed, having served its purpose of establishing a realm unconstrained by realism. Discworld, for example, only very rarely mentions our world or any other worlds, as Pratchett set the books in a parallel universe instead of in "our" reality to allow for magic on the Disc. The Chronicles of Narnia also uses to a lesser extent the idea of parallel universes; this is brought up but only briefly mentioned in the introduction and ending, its main purpose to move the protagonists from and to "our" reality and the principal setting of the books.

The 1990s TV series depicts a group of adventurers visiting assorted parallel universes, as they attempt to find their "home" universe. Included in the 1st season is a universe where the world is stuck in the ice age, with no life anywhere. Another episode includes 'Honest Abe' never to be president, in which the United States loses World War I and World War II, and they are controlled by a senator, and technology is at an all-time low.

Sliders

One of the earliest television plots to feature parallel time (outside of the Twilight Zone) was a 1970 storyline on the soap opera . Vampire Barnabas Collins found a room in Collinwood which served as a portal to parallel time, and he entered the room in an attempt to escape from his current problems. A year later, the show again traveled to parallel time, the setting this time being 1841.

Dark Shadows

A well known and often imitated example is the 1967 original episode entitled "Mirror, Mirror". The episode introduced an alternative version of the Star Trek universe where the main characters were barbaric and cruel to the point of being evil twins. When the parallel universe concept is parodied, the allusion is often to this episode. An earlier episode for the Trek series first hinted at the potential of differing reality planes (and their occupants), titled "The Alternative Factor". A mad scientist from "our" universe, named Lazarus B., hunts down the sane Lazarus A.; resident of an antimatter-comprised continuum. His counterpart, in a state of paranoia, claims the double threatens his and the very cosmos' existence. With help from Captain Kirk, A traps B along with him in a "anti"-universe, for eternity, thus bringing balance to both matter-oriented realms. A similar plot was used in the Codename: Kids Next Door episode Operation: P.O.O.L..

Star Trek

The mirror universe of Star Trek was further developed by later series in the franchise. In several episodes of , the later evolution of the mirror universe is explored. A two-part episode of Star Trek: Enterprise, entitled "In a Mirror, Darkly", serves as a prequel, introducing the early developments of the Mirror Universe.

Star Trek: Deep Space Nine

In the 1970s young adult British SF series , its second-season episode, A Rift in Time (March–April 1974) pitted the three telepath core characters and allies against time travelling interlopers from an alternative history where the Roman Empire developed the steam engine in the first century CE, had a technological head start, did not fragment during the fifth century and underwent accelerated technological development. The Roman eagle standard was planted on the Moon in the fifth century and by its alternative twentieth century, it had mastered interstellar travel, had a galactic empire and time travel. Consequently, the Tomorrow People had to rectify this aberrant timeline by dismantling and disabling the anomalous steam engine.

The Tomorrow People

Multiple episodes of use the concept. In "Parallel Universe" the crew meet alternative versions of themselves: the analogues of Lister, Rimmer and Holly are female, while the Cat's alternative is a dog. "Dimension Jump" introduces a heroic alternative Rimmer, a version of whom reappears in "Stoke Me a Clipper". The next episode, "Ouroboros", makes contact with a timeline in which Kochanski, rather than Lister, was the sole survivor of the original disaster; this alternative Kochanski then joins the crew for the remaining episodes.

Red Dwarf

In episode "The Wish", Cordelia Chase inadvertently creates an alternate reality in which Buffy never moved from Los Angeles to Sunnydale, allowing vampires to dominate the town openly and turn her core-universe allies Xander Harris and Willow Rosenberg into vampires. Later, that world's vampire version of Willow is accidentally brought into the core world.

Buffy the Vampire Slayer

The plot of the episode of Charmed, entitled "Brain Drain", features The Source of All Evil kidnapping Piper Halliwell and forcing her into a deep coma, where she experiences an alternative reality in which the Halliwell manor is actually a mental institution. She and her sisters serve as patients in this universe, their powers only a manifestation of their minds, a ruse put up to trick Piper into willingly relinquishing the sisters' magic.

season four

The includes many stories in which alternate timelines, alternate dimensions and alternate realities are explored. These include the Stargate SG-1 episodes "There But For the Grace of God", "Point of View", "Crystal Skull", "2010", "Moebius" parts 1 and 2, "Babylon", "Ripple Effect", "Arthur's Mantle", "The Road Not Taken", "Unending" and the direct-to-DVD movie Stargate: Continuum, the Stargate Atlantis episodes "Before I Sleep", "McKay and Mrs. Miller", "The Last Man", "The Daedalus Variations", "Vegas" and "Enemy at the Gate", and the Stargate Universe episodes "Time", "Twin Destinies", "Common Descent" and "Epilogue".

Stargate franchise

The animated series, , had an episode where the characters travel between "Universe 1" and "Universe A (also known as universe Γ)" via boxes containing each universe; and one of the major jokes is an extended argument between the two sets of characters over which set were the "evil" ones. They also had another episode where they travel to the edge of the universe and in the distance was the cowboy universe where everyone was dressed as cowboys. It was accidentally invented by Professor Farnsworth.

Futurama

The idea of a parallel universe and the concept of was a major plot line of the first-season finale of Fringe, guest-starring Leonard Nimoy of Star Trek. The show has gone on to feature the parallel universe prominently.

déjà vu

In the 2010 season of , the result of characters traveling back in time to prevent the crash of Oceanic Flight 815 apparently creates a parallel reality in which the Flight never crashed, rather than resetting time itself in the characters' original timeline. The show continued to show two "sets" of the characters following different destinies, until it was revealed in the series finale that there was really only one reality created by the characters themselves to assist themselves in leaving behind the physical world and passing on to an afterlife after their respective deaths.

Lost

Dragon Ball Z

The anime attempted to combine all the parallel Gundam universes (other incarnations of the series, with similar themes but differing stories and characters, that had played out at different times since the debut of the concept in the 1970s) of the metaseries into one single reality.

Turn A Gundam

The anime and manga series takes place in a parallel universe that is different from the one in the series' predecessor Eureka Seven. The E7 series started off in the year 12005, and the AO world, which takes place in the year 2025, would be the home of the two main characters' son.

Eureka Seven: AO

The anime and manga series by Akira Amano features this idea in its third main arc, known as Future arc.

Katekyo Hitman Reborn!

The anime features a parallel world in one of the final episodes. This parallel world is a sharp contrast to the harsh, dark "reality" of the show and presents a world where all the characters enjoy a much happier life. This parallel world would become the basis for the new Evangelion manga series Angelic Days.

Neon Genesis Evangelion

The anime series features a parallel universe called Vestroia and is the homeworld of fantastic creatures called Bakugan. The series' hero Dan Kuso alongside his friends and teammates must save Earth and Vestroia from total destruction. Season 2 & 3 feature another universe where Dan and his team save the day. They go to another dimension or universe through a pathway. The other universe has also other life forms and other types of technology.

Bakugan

In another anime series, , there is a parallel universe called "digital world". The show's child protagonists meet digital monsters, or digimon, from this world and become partners and friends. In the third story arc of Digimon Fusion, the Clockmaker (who is later revealed to be Bagramon) and his partner Clockmon travel through space-time to recruit heroes from previous series so they can help the Fusion Fighters to defeat Quartzmon before DigiQuartz can absorb each human and digital world in the multiverse.

Digimon

In the anime series the rounds of the battle between Battler and Beatrice take place in different dimensions, to show all kinds of possibilities (much to Battler's dismay) also the character Bernkastel is known for her ability to travel into different worlds by the usage of "fragments".

Umineko no Naku Koro ni

In the episode "Parallels", Lt. Worf traveled to several parallel universes when his shuttlecraft went through a time space fissure.

Star Trek: The Next Generation

The episode Remedial Chaos Theory, six different timelines and one "prime" timeline are explored, each having a different outcome based on which member of the study group goes to get the pizza. One timeline, dubbed the "Darkest Timeline", results in the greatest amount of terrible incidents and ends with Abed donning a felt goatee bearing resemblance to Spock's in "Mirror, Mirror".

Community

In the 2003 anime series of , there exists a gateway that can be conjured by alchemists that acts as a source of all knowledge and energy; towards the end of the series, it is revealed that this gateway connects the world of the anime with the real world, set during the first decades of the 20th century. It is revealed that the two worlds shared a common history until their histories diverged, apparently due to the success of alchemy in one world and that of modern physics in the other.

Fullmetal Alchemist

Books[edit]

The Wolves Chronicles by Joan Aiken are a series of Children's literature novels set during an alternative history where the channel tunnel was completed during the Napoleonic Wars and used by several subspecies of Canis Lupis made up of Steppe wolf, Eurasian wolf, Tundra wolf and even Mongolian wolf and Italian wolf to use it to migrate out of scarceness of food and pelt collecting to England. So in a parallel early 19th century during the reign of the fictional King James the Third the wolves have evolved to resemble the Florida black wolf and are a constant presence in the background of all these characters in the stories, particularly the child protagonists in which those particular tales focus on.


Time Echoes Trilogy by Bryan Davis addresses the idea of parallel worlds as it delves into a plot in which the main character travels between three different "earths" each moving at a different speed of time so one earth is 20 years in the past while another one is 10 minutes into the future when compared to the earth from which the character exists.


Overstrike by C. M. Angus features high-functioning schizophrenics with the ability to simultaneously perceive multiple realities.


Some later retellings of Peter Pan feature alternative versions to those characters (and locations) created by J. M. Barrie, transplanted into a alternate reality. Among these parallel Peter Pan interpretations are: Tigerheart, Shelby and the Lost Boy of Misbegot Islands (and serials) Tales of the Airship Neverland, Nevermor and Everland.

Comic books[edit]

Parallel universes in modern comics have become particularly rich and complex, in large part due to the continual problem of continuity faced by the major two publishers, Marvel Comics and DC Comics. The two publishers have used the multiverse concept to fix problems arising from integrating characters from other publishers into their own canon, and from having major serial protagonists with continuous histories lasting, as in the case of Superman, over 70 years. Additionally, both publishers have used new alternative universes to re-imagine their own characters. (See Multiverse (DC Comics) and Multiverse (Marvel Comics)) DC's Michael Moorcock's Multiverse collected 12 issues in 1999 with an introduction by Moorcock which offered a sophisticated description of his rationale.


DC Comics inaugurated its multiverse in the early 1960s, with the reintroduction of Golden Age superheroes the Justice Society of America now located on Earth-Two, and devised a "mirror universe" scenario of inverted morality and supervillain domination of Earth-Three shortly afterwards, several years before Star Trek devised its own darker alternative universe. There was a lull before DC inaugurated additional alternative universes in the seventies, such as Earth-X, where there was an Axis victory in World War II, Earth-S, home to the Fawcett Comics superheroes of the forties and fifties, such as Captain Marvel, and Earth-Prime, where superheroes only existed in fictional forms.


Therefore, comic books, in general, are one of the few entertainment mediums where the concept of parallel universes are a major and ongoing theme. DC in particular periodically revisits the idea in major crossover storylines, such as Crisis on Infinite Earths and Infinite Crisis, where Marvel has a series called What If... that's devoted to exploring alternative realities, which sometimes impact the "main" universe's continuity. DC's version of "What If..." is the Elseworlds imprint.


DC Comics series 52 heralded the return of the Multiverse. 52 was a mega-crossover event tied to Infinite Crisis which was the sequel to the 1980s Crisis on Infinite Earths. The aim was to yet again address many of the problems and confusions brought on by the Multiverse in the DCU. Now 52 Earths exist and including some Elseworld tales such as Kingdom Come, DC's imprint WildStorm and an Earth devoted to the Charlton Comics heroes of DC. Countdown and Countdown Presents: The Search for Ray Palmer and the Tales of the Multiverse stories expand upon this new multiverse.


Marvel has also had many large crossover events which depicted an alternative universe, many springing from events in the X-Men books, such as 1981's Days of Future Past, 1995's Age of Apocalypse, and 2006's House of M and 2014's Spider-Verse storyline involving alternate versions of Spider-Man. In addition, the Squadron Supreme is a DC inspired Marvel Universe that has been used several times, often crossing over into the mainstream Universe in the Avengers comic. Exiles is an offshoot of the X-Men franchise that allows characters to hop from one alternative reality to another, leaving the original, main Marvel Universe intact. The Marvel UK line has long had multiverse stories including the Jaspers' Warp storyline of Captain Britain's first series (it was here that the designation Earth-616 was first applied to the mainstream Marvel Universe).


Marvel Comics, as of 2000, launched their most popular parallel universe, the Ultimate Universe. It is a smaller subline to the mainstream titles and features Ultimate Spider-Man, Ultimate X-Men, Ultimate Fantastic Four and the Ultimates (their "Avengers").


The graphic novel Watchmen is set in an alternative history, in 1985 where superheroes exist, the Vietnam War was won by the United States, and Richard Nixon is in his fifth term as President of the United States. The Soviet Union and the United States are still locked in an escalating "Cold War" as in our own world, but as the Soviet Union invades Afghanistan in this world and threatens Pakistan, nuclear war may be imminent.


In 1973 Tammy published The Clock and Cluny Jones, where a mysterious grandfather clock hurls bully Cluny Jones into a harsh alternative reality where she becomes the bullied. This story was reprinted in Misty annual 1985 as Grandfather's Clock.


In 1978 Misty published The Sentinels. The Sentinels were two crumbling apartment blocks that connected the mainstream world with an alternative reality where Hitler conquered Britain in 1940.


In 1981 Jinty published Worlds Apart. Six girls experience alternative worlds ruled by greed, sports-mania, vanity, crime, intellectualism, and fear. These are in fact their dream worlds becoming real after they are knocked out by a mysterious gas from a chemical tanker that crashed into their school. In 1977 Jinty also published Land of No Tears where a lame girl travels to a future world where people with things wrong with them are cruelly treated, and emotions are banned.


The parallel universe concept has also appeared prominently in the Sonic the Hedgehog comic series from Archie Comics. The first and most oft-recurring case of this is another "mirror universe" where Sonic and his various allies are evil or anti-heroic while the counterpart of the evil Dr. Robotnik is good. Another recurring universe featured in the series is a perpendicular dimension that runs through all others, known as the No Zone. The inhabitants of this universe monitor travel between the others, often stepping in with their Zone Cop police force to punish those who travel without authorization between worlds.


In more recent years, the comic has adapted the alternative dimension from the video games Sonic Rush and Sonic Rush Adventure, home to Sonic's ally Blaze the Cat. The continuities seen in various other Sonic franchises also exist in the comic, most notably those based on the cartoon series Sonic Underground and Sonic X. For some years, a number of other universes were also featured that parodied various popular franchises, such as Sailor Moon, Godzilla, and various titles from Marvel Comics. Archie has also used this concept as the basis for crossovers between Sonic and other titles that they publish, including Sabrina the Teenage Witch and Mega Man.


The various Transformers comics also feature the parallel universe concept, and feature the various continuities from different branches of the franchise as parallel worlds that occasionally make contact with each other. Quite notably, the annual Botcon fan convention introduced a comic storyline that featured Cliffjumper, an Autobot from the original Transformers series, entering an alternative universe where his fellow Autobots are evil and the Decepticons are good. This universe is known as the "Shattered Glass" universe, and continued on in comics and text based stories after its initial release.

Audio drama[edit]

Within the Wires takes place in a parallel universe in which family structures and countries have been abolished after a "Great Reckoning" has killed a large share of the world population.


In The Gray Area, the seven part serial "Paths Not Taken" takes place in an alternative universe in which Donald Trump has won a second presidential term, gay people are criminalized and arrested, and a violent authoritarian movement known as the "Thanksgiving Cleanse" has swept the nation. In addition, the main universe of the series takes place in a timeline in which Hillary Clinton won the 2016 presidential election.


Victoriocity takes place in an alternative 1887 London, where "Queen Victoria is a cyborg and a real-life architect is worshipped by a legion of laborers."[12]

In the adventure game (1996), after resolving several mind-blowing and unique puzzles, the player gets past "The Tiki Guards"; and a door opens up to "The Void" – actually a room to another universe, which houses the entirety of space.

9: The Last Resort

(1998) features a world called "Click Clock Wood", which has spring, summer, autumn and winter variants. The environment develops between the seasons making some areas accessible or inaccessible, and actions taken in one season affect the outcome in others.

Banjo-Kazooie

The first-person shooter (2013) features the many worlds interpretation of quantum mechanics. The main character is named Booker Dewitt, an homage to physicist Bryce DeWitt.

BioShock Infinite

The 2018 fighting game brings together the universes in a BlazBlue, Persona 4 Arena, Under Night In-Birth, and RWBY in a singularity called the "Phantom Field" where the characters fight over the "Keystones".

BlazBlue: Cross Tag Battle

The story of (1999) centers around travel between two alternative timelines, the original or "Another World" and "Home World" which is a branch created by the actions of the heroes of the game's predecessor, Chrono Trigger.

Chrono Cross

(2004), a massively multiplayer online role-playing game, features a Player vs Player (PvP) zone called Recluse's Victory. It is an alternative future in a constant state of flux, as heroes and villains battle for the future of Earth.

City of Heroes

(2004) features Crash, Cortex, and Nina traveling to the "10th dimension", which could also be a parallel universe (suggested by the theme and how everything seems to be opposite, with the presence of an "Evil Crash", and also planned to have "Good Cortex" and "Evil Coco", but they were cut during development).

Crash Twinsanity

In the psychological horror point-and-click adventure game (1992), the main character Mike Dawson discovers a parallel universe by going through his living room mirror.

Dark Seed

(2007) pivots around a world of darkness you travel to when you die, which is occupied by World War 1 soldiers.

The Darkness

(1994) features many areas of the game that can be considered alternative dimensions. The first is an illusion created by the Mani Mani Statue that transforms the metropolis of Fourside into a bizarre neon metropolis called Moonside, filled with unusual characters and enemies. The second is Magicant, the world of Ness's subconscious that is accessed after obtaining the Eight Melodies. Finally, toward the end of the game, the protagonists arrive at the Cave to the Past, where they travel back in time to the haunting past dimension of the cave to face Giygas.

EarthBound

(2006) features an alternative hellish world called "Oblivion", as well as a painting you can climb into and a quest where you enter a dream world.

The Elder Scrolls IV: Oblivion

series (1997– ) takes place in a subtly different universe. For example, the ship that landed the first men on the moon in 1969 is called Valiant 11, rather than Apollo 11. This universe diverged from ours after World War II, which resulted in a lack of advanced computers, the Cold War, VHS, etc.

Fallout

In (2024), multiple alternate worlds were revealed to have been created as a result of the main cast previously defeating the Arbiter of Fate in Final Fantasy VII Remake. Zack Fair, the main character of Crisis Core: Final Fantasy VII and Aerith's first love, survived his fated showdown with the Shinra military in an alternate timeline where the Lifestream was depleted from the Planet. Zack and an alternate Aerith each fight beside the main character Cloud Strife during the end of the game.

Final Fantasy VII Rebirth

In (2002), most of the story is set in Patriot City, but a number of other locations and time periods are used, including magical realms, prehistoric times, and realms entirely removed from time and space.

Freedom Force

series (1998– ) revolves heavily around alternative universes. Xen is a location in the first Half-Life game, accidentally discovered by scientists and described as a border world between dimensions, where the player must travel to stop an alien invasion. Half-Life 2 features a multidimensional empire called The Combine which has successfully conquered Earth and subdued humanity, among countless other universes and species.

Half-Life

(2015) takes place in the Nexus, a strange limbo of clashing universes, which collide from across space, time, and dimensions. The Nexus exists in the center of a trans-dimensional cosmic storm, which can rip worlds and universes in and out of existence, and it can also pull worlds into stability. Some of the central realms in the Nexus are examples of these points of stability. Every Realm within the Nexus has one stone called "Singularity", and only the one who achieves it through conquest can become the Realm Lord. Many powerful warriors have been sucked into the Nexus, including combatants from Warcraft, StarCraft, Diablo, and Overwatch universes. New combatants are constantly arriving, some of them are chosen after they died in their original reality.

Heroes of the Storm

series (2002– ) features a Disney/Square Enix's Final Fantasy multiverse, in which various worlds are based on Disney films or concepts from the Final Fantasy line. The series also introduces the concept of different "Realms" corresponding to Light, Darkness, and In-Between where all of the worlds take place.

Kingdom Hearts

In the series, some of the most prominent locations are other dimensions in the form of Another Dimension, The Mirror World, Cyberspace, Dreamscape, and much more. The Kirby Clash series of games take place in the Dream Kingdom, in a parallel universe apart from the series' primary setting of Dream Land. These games are connected to the main series' canon through the events of Kirby's Return to Dream Land Deluxe.

Kirby

The series (1996– ) is played through several realms and timelines.

Legacy of Kain

(1991) features a dark and twisted parallel version of Hyrule called the "Dark World". In the Ocarina of Time (1998) after the main protagonist, Link, defeats the dark lord, Ganon, he travels back in time to his childhood. This results in two alternative histories for Hyrule. In one a younger version Link travels to the land of Termina in Majora's Mask (2000). In the other Link is no longer present allowing Ganon to return to go on a rampage that forced the gods of Hyrule to flood the world in The Wind Waker (2002). There is also a scenario in which Link is killed by Ganon in the final battle, resulting in an alternative history in which Hyrule is put in an era of decline, leading to the events of A Link to the Past.[13] The Majora's Mask takes place in Termina, a parallel world to Hyrule. Almost all of the characters from Ocarina of Time reappear in the game. The Oracle of Seasons and Oracle of Ages (2001) use a similar concept to that which is used in A Link to the Past. In those games, the player must switch between the parallel past and present worlds (Ages) and between spring, summer, autumn and winter (Seasons) to progress through the game. In the first half of Twilight Princess (2006), areas of Hyrule are veiled by the Twilight Realm. These areas are dusky and brooding in appearance, Link cannot transform out of wolf form, characters only appear as spirits that cannot be communicated with, and enemies are twilight variations of their regular forms. Otherwise, the Twilight Realm is identical to regular Hyrule.

The Legend of Zelda: A Link to the Past

The world of the classic cult adventure games of (1999) created by Ragnar Thornqast, along with its sequels, deals with the existence of two parallel universes – technological (Stark) and magical (Arcadia).

The Longest Journey

(2023) is set in a new timeline created by Liu Kang after winning control of the Hourglass from Kronika and Shang Tsung and becoming Keeper of Time in Mortal Kombat 11 and its Aftermath expansion. Later in the story, it is revealed that the battle for Kronika's Hourglass in Mortal Kombat 11 had led to the creation of numerous other timelines in which other characters became Keepers of Time. Characters from these timelines appear in Liu Kang's timeline by the game's climax. The game's main antagonist is Titan Shang Tsung, who hails from Aftermath’s alternate ending in which he kills Liu Kang and takes the Hourglass, and later infiltrates the surviving Liu Kang's timeline disguised as Kronika to empower that timeline's Shang Tsung and Quan Chi.

Mortal Kombat 1

(2004) involves a world, "Aether", having an alternative self in the, "Dark" realm, universe, or dimension. The protagonist, Samus, finds out that she just dropped into a hopeless war for the Luminoth, the dominant species of Light Aether against the Ing, the dominant species of Dark Aether. She also finds her counterpart, Dark Samus or Metroid Prime's essence inside Samus's Phazon Suit.

Metroid Prime 2: Echoes

In the adventure PC game (1993), the unnamed protagonist travels to multiple alternative worlds through the use of special books, which describe a world within and transport the user to that world when a window on the front page is touched.

Myst

In (1998), a text-based science fiction MMORPG, refugees from Earth's universe were forced to migrate to a parallel universe called "Hiverspace", whose quantum divergence occurred billions of years in the past, after damage to the time/space continuum began to tear their own universe apart.[14] Eventually, they were able to find a means back to a past universe whose quantum divergence from their original ones was relatively minor.

OtherSpace

In the role-playing game (1999), a probe is sent to a parallel universe and is attacked by an "entity". Cutter Slade must escort a team of scientists across to the other world to retrieve and repair the damaged probe before the earth is consumed by a black hole.

Outcast

(2000) takes place in an alternative universe called "This Side" wherein the events of Innocent Sin did not take place and the characters have never met in the past.

Persona 2: Eternal Punishment

(2008) features the main cast entering an alternate dimension called the TV World, which exists as part of the Collective Unconscious in the larger Megami Tensei multiverse, to find a serial killer in the town of Inaba.

Persona 4

(2011), an action-adventure video game, features a game-mode entitled "Perpetual Testing Initiative" (PeTI), where a plot item features protagonist "Bendy" through thousands of different worlds of which character Cave Johnson exist in different roles entitled "The Multiverse", and the PeTI's parallel universes are different from the main Half-Life/Portal timeline.

Portal 2

(2006) is set in alternative universe where Tsarist Russia never experienced the Russian Revolution but instead became the bridgehead for an aggressive alien invasion from a species known as the "Chimera", who then proceed to overrun Western Europe, Great Britain, Canada and much of the United States, and where there has been no Second World War as a result. The events of the game and its sequels begin in its alternative 1951.

Resistance: Fall of Man

In the video game series Silent Hill (1999– ), the town of Silent Hill fluctuates between the real world, where Silent Hill is seemingly just an ordinary tourist town, the Fog World, which is like the real world, except the town is shrouded in thick fog and is nearly uninhabited except for monsters and a few people, and a dark and dilapidated version of the town called the "Other World".

survival horror

Each Zone in (1993) has four variations: Past, Present, Bad Future and Good Future, each displaying some subtle and not-so subtle alterations. The series has also seen alternative dimensions, and parallel universes in the case of the Sonic Rush (2005), in which Sonic encounters a hero from another world named Blaze the Cat whose nemesis is an alternative counterpart of his own foe, Dr. Eggman. The Sonic series of Sonic The Hedgehog 2006, Generations And Rivals also makes use of the concept of Wormholes, and alternative timelines.

Sonic CD

(2004) is set in a realm of light and a parallel realm of darkness.

Sudeki

(1996) features a world called "Tiny Huge Island" which has two variants: one scaled up, the other scaled down. The player can only access certain parts of the level to obtain certain stars depending on which variant they are into. The two variants can be switched between via portals in the world.

Super Mario 64

(1988) features a "Magic Potion" item that when used, creates a doorway allowing the player to temporarily access "Subspace"; a mirrored silhouette version of the world where items can be found.

Super Mario Bros. 2

After the completion of the Special World in (1990), the overworld transforms from a green-colored springtime to an orange-colored autumnal setting. Many enemies encountered in the game are transformed into bizarre counterparts.

Super Mario World

In (2007), the town "Flipside" (which acts as the game's central hub) has an alternative mirrored version called "Flopside". While Flipside appears pristine and the residents there are typically cheerful, Flopside appears somewhat dilapidated and is populated by surly characters.

Super Paper Mario

Both titles of the When They Cry visual novel series ( and Umineko for short) contain the concept of parallel worlds. These series both involve some kind of murder mystery. As soon as the main character has 'lost', another parallel world, called a Fragment, is chosen to be observed. This continues until the entire mystery is solved.

Higurashi

The visual novel/puzzle video game series heavily uses the concept of multiple realities as the basis for its plot as well as its central gameplay mechanic of traversing through realities and altering history. In this fictional universe, characters use a method of travelling between different timelines called "SHIFT" (short for "Spacetime Human Internal Fluctuating Travel").

Zero Escape

The survival video game (2013) involves the many playable characters efforts to survive in a semi-nightmarish parallel world of wilderness known as the Constant, the story reveals that much of the world was once ruled by a race of sentient and technologically advanced arthropodal creatures, who destroyed themselves with the overuse of nightmare fuel, the Constant appears to change according to how afraid the characters are feeling, and is now controlled by mysterious shadow creatures that appear to those who are afraid and is also somewhat controlled by whoever is trapped on the "nightmare throne".

Don't Starve

is set in an alternative universe to the Saints Row series in which the Third Street Saints never forms, which leads up to Vice Kings, Los Carnales and Westside Rollerz uniting into one gang.

Agents of Mayhem

In The Last Stand Update (2020), release The Last Stand map where all players case that the survivors took a different path leading to the Death Toll Finale. Instead of going to the Boathouse, players choose to go to the Lighthouse by a truck. Players must light the long-disused lighthouse and fight against a lot of infected to wait a rescue boat.

Left 4 Dead 2

World as Myth

Media related to Multiverse (science fiction) at Wikimedia Commons

Parallel Universe: is there any other life?