History Main / MergedReality

** During the events of the ''March of the Machine'' expansion, the plane of New Phyrexia is cast out into nothingness by the dryad planeswalker Wrenn after she bonds with the WorldTree that the Phyrexians were using to invade the rest of the multiverse, and its place in the multiverse is taken by [[AfroFuturism Zhalfir]], a part of Dominaria that had been phased out of reality to protect it during the original Phyrexian invasion, which becomes its own plane. Zhalfir is now orbited by the five colored moons that once orbited Mirrodin (a plane where all people and creatures are partly metallic from birth, which was corrupted into New Phyrexia by [[TheVirus Phyrexian glistening oil]]) and the surviving uninfected Mirrans have settled there as well alongside the Zhalfirin people.

** During the events of the ''March of the Machine'' expansion, the plane of New Phyrexia is cast out into nothingness by the dryad planeswalker Wrenn after she bonds with the WorldTree that the Phyrexians were using to invade the rest of the multiverse, and its place in the multiverse is taken by [[AfroFuturism Zhalfir]], a part of Dominaria that had been phased out of reality to protect it during the original Phyrexian invasion, which becomes its own plane. Zhalfir is now orbited by the five colored moons that once orbited Mirrodin (a plane where all people and creatures are partly metallic, which was corrupted into New Phyrexia by [[TheVirus Phyrexian glistening oil]]) and the surviving uninfected Mirrans have settled there as well alongside the Zhalfirin people.

** During the events of the ''March of the Machine'' expansion, the plane of New Phyrexia is cast out into nothingness by the dryad planeswalker Wrenn after she bonds with the WorldTree that the Phyrexians were using to invade the rest of the multiverse, and its place in the multiverse is taken by [[AfroFuturism Zhalfir]], a part of Dominaria that had been phased out of reality to protect it during the original Phyrexian invasion, which becomes its own plane. Zhalfir is now orbited by the five colored moons that once orbited Mirrodin (the techno-organic plane that was corrupted into New Phyrexia by [[TheVirus Phyrexian glistening oil]]) and the surviving uninfected Mirrans have settled there as well alongside the Zhalfirin people.

* ''TabletopGame/MagicTheGathering'' had the artificial plane of Rath, created parallel to the primary plane of Dominaria as a staging world for an invasion by the bio-mechanical Phyrexians, with only a thin interdimensional boundary between the two. For awhile creatures and entire regions could be lost in the boundary between worlds, pulling them from Dominaria to Rath, but finally in the aptly named ''Invasion'' set, the primary attack was initiated by the "Rathi overlay" merging Rath into Dominaria, carrying all the invasion forces along with the plane itself in one massive event.

** The backstory of the plane Arcavios, where the WizardingSchool-themed expansion ''Strixhaven: School of Mages'' is set, states that it was once two different planes that collided. Furthermore, when the leylines merged, for some reason they were drawn to leylines of opposing mana, which is why each college of Strixhaven is associated with an enemy-color pair.

* In ''Manga/{{Bleach}}'', the Human World, Soul Society and Hueco Mundo were originally [[PrimordialChaos one chaotic world]] where the concept of Death did not exist; people simply existed. Then the [[{{god}} Soul King]] showed up and, in an attempt to make existence more bearable after annihilating Hollows only made things worse, split the world into the three realms, separating life and death and creating the [[{{reincarnation}} cycle of reincarnation]]. The ultimate goal of [[BigBad Yhwach]] is revealed to be the merger of all three realms back into one [[spoiler:in order to [[ImmortalsFearDeath cheat death for all eternity]]]]. When [[spoiler:[[KillTheGod killing the Soul King]], [[CosmicKeystone who serves as the linchpin holding the realms together]],]] proves insufficient, he decides to [[spoiler:[[TheAssimilator absorb the Soul King]] and use his power to merge the realms manually]], dubbing his new world "[[GratuitousGerman Wahrwelt]]".[[note]]''[[BilingualBonus True World]]'' in German[[/note]]

** The author uses the same concept in [[Fanfic/GuardiansWizardsAndKungFuFighters another story]]; as [[WesternAnimation/JackieChanAdventures Shendu]] is being resealed at the end of the Demon World story, [[ForWantOfANail he chooses]] to spitefully destroy the Book of Ages, triggering a TimeCrash. Jade desperately scribbles onto a remaining fragment of the Book that they all survive, which it interprets by fusing the remnants of their universe with the ''WesternAnimation/{{WITCH}}'' universe, retroactively making the JCA characters part of its history.

** The end result of the ''ComicBook/SonicTheHedgehogMegaManWorldsCollide'' CrisisCrossover's ending towards Sonic's World in ''ComicBook/SonicTheHedgehogArchieComics''. Thanks to Eggman's mucking, Sonic's World is now one part "Mobius Prime" and one part "Mobius Genesis", resulting in a blending of [[VideoGame/SonicTheHedgehog game]] and [[WesternAnimation/SonicTheHedgehogSatAM SatAM]] elements, among other {{cosmic retcon}}s (Eggman's main base being the Metropolis Zone, Knothole being situated in the Wood Zone, Mobotropolis now in Westside Island...).

* In ''[[VideoGame/SonicRushSeries Sonic Rush]]'', Eggman's theft of the [[CosmicKeystone Sol Emeralds]] from Blaze's dimension is causing it and Sonic's dimension to merge together. Eggman and his doppelganger Eggman Nega plan to build a transdimensional Eggmanland in the wake of the collision, but the heroes are able to stop them before both worlds are completely ruined. It's also noted that this is only happening because the two sets of Emeralds aren't being controlled properly, and once Blaze learns how to properly utilize the Sol Emeralds' powers she's able to traverse the dimensional barrier between the two without risking the dimensions.

* ''ComicBook/MilestoneForever', which served as a belated conclusion to the Milestone Comics continuity, ended with Dharma saving the Dakotaverse by merging it with the DC Universe.

** Just like its original comic version, ''Series/CrisisOnInfiniteEarths2019'' culminates in TheMultiverse being destroyed and then rebooted. The reality that emerges at the center of this new multiverse (dubbed Earth-Prime) contains elements from at least three previously distinct Earths -- Earth-1 (where the bulk of the pre-Crisis Arrowverse took place), Earth-38 (the setting of ''Series/Supergirl2015''), and Earth-BL[[note]]Nickname granted by [[TheWikiRule the Arrowverse Wiki]] so they had something to call it[[/note]] (the Earth where ''Series/BlackLightning2018'' took place until "[[Recap/BlackLightning2018S3E9EarthCrisis Earth Crisis]]").

* With multiple uses of time travel in the whole ''[[VideoGame/CommandAndConquerRedAlertSeries Red Alert]]'' series this trope is normally averted (timelines are, canonically, overridden in succession). However, a merging of timelines is deployed for the ending of the Allied campaign in the ''Yuri's Revenge'' expansion of ''VideoGame/CommandAndConquerRedAlert2'': after Yuri's initial plot at simultaneous worldwide psychic domination while the Allies were distracted celebrating the defeat of the Soviets hits a snag in San Francisco due to an ultimately-fortuitous Harrier crash on Alcatraz, the Allies' task forc jump back in time to warn their past selves - they end up back at the initial Soviet invasion of San Francisco during the original game. Among other things, this means the assassination of General Carville by a Crazy Ivan just prior to the battle in the Black Forest[[note]]10th mission in the Allied campaign of the original [=RA2=][[/note]] gets retconned out. During the denouement of the Allied campaign everybody's screens start shaking like earthquakes as Einstein explains the timelines are merging since two sets of events at the same time cannot coexist - thankfully, the best events of both timelines for the Allies are kept: as before the Soviets are still defeated, but now Carville is still alive and Yuri is now in a TailorMadePrison to render his psychic abilities useless.

** In ''Series/KamenRiderBuild'', this ends up being the heroes' ultimate plan to save the world. [[spoiler:They combine their Earth with the Earth from a parallel universe (implied to be the main ''Kamen Rider'' universe (if such a thing exists, with the franchise's SchizoContinuity)) where the series' events never happened, using the BigBad as fuel to ensure he doesn't exist in the resulting world. Most of the characters end up merging with their parallel counterparts in the new world, who don't remember anything that happened. Sento and Ryuga, however, because of how fundamentally they were altered, end up as anomalies who ''do'' remember the show's events and actually coexist with their parallel counterparts. This makes for a BittersweetEnding, though: our two heroes end up alone, with no place in a new world where versions of them who never experienced the series' events are back where they belong. However, post-series team-up stuff will have the other characters' memories restored. ...Just in time for the Zi-O series to shake things up even more, leaving the Build characters' status unclear.]]
** Build's successor ''Series/KamenRiderZiO'' had a more malicious example due to the various time paradoxes that occurred throughout the show, [[TimeCrash time is slowly breaking down.]] [[spoiler:By the final arc, reality has broken down so much that the various alternative Kamen Rider worlds have fused together, which creates chaos as the various enemies of those worlds are running free without their respective Riders to stop them. This is revealed to be part of the BigBad's plan to destroy the resulting fused world to save his own]].

* In the finale of ''Series/OnceUponATime'', [[spoiler: Regina casts a Curse which brings all the magical realms to be merged in Storybrook where every fairy tale character can be together and live in peace. Regina is then elected as the ruler.]]

* ''TabletopGame/MagicTheGathering'' had the artificial plane of Rath, created parallel to the primary plane of Dominaria as a staging world for an invasion, with only a thin interdimensional boundary between the two. For awhile creatures and entire regions could be lost in the boundary between worlds, pulling them from Dominaria to Rath, but finally in the aptly named "Invasion" set, the primary attack was initiated by the "Rathi overlay" merging Rath into Dominaria, carrying all the invasion forces along with the plane itself in one massive event.

* In ''{{Series/Fringe}}'', due to the activation of [[spoiler: [[CosmicKeystone the Vacuum]] by Peter, a bridge is created between both the Prime and Alternate universe, preventing them from further collapse. This allows both universe's team to have the time to try and solve the problem.]] Before this, the dimensions bridging was a ''disaster.'' BodyHorror as people were {{TeleFrag}}ged with alternates who were standing in sorta-but-not-exactly the same spot. The side effect of merging the universes is that Peter is [[RetGone RetGoned]] for several episodes until he manages to force his way back into existence.

* In ''ComicBook/WorldsCollide1994'', BigBad Rift decides to try this on a smaller scale, merging Metropolis with Dakota. It ends messily with the merged cities just being devastated (even further in Metropolis' case due to ''ComicBook/TheFallOfMetropolis'' event).

* ''VideoGame/XenobladeChronicles3'' has Aionios, a world created at the precise instant that the new worlds of ''VideoGame/XenobladeChronicles1'' and ''VideoGame/XenobladeChronicles2'' merged due to the two worlds colliding. A construct called Origin was meant to restore the worlds to their un-merged states, but was hijacked by the BigBad who has frozen time and is ensuring this merged world survives in what is referred to several times as "The Endless Now". The moment Origin is re-activated, the worlds will be allowed to de-merge and continue onward, and the game centers around activating Origin to allow that to happen. As is expected of such a merger between two old worlds, many familiar sights or regions appear, often with a new twist (for example, the Makna Forest of [=XC1=] and abandoned city Morytha of [=XC2=] have merged to become the Maktha Wildwood, an abandoned city overgrown by a jungle).

** ''VideoGame/TalesOfSymphonia'' ends up with this being the goal of the main characters, although for much of the second half of the game they are under the mistaken impression that they need to SaveBothWorlds by keeping them apart. [[spoiler:It just so happens that the resulting combination ends up being the world map of ''VideoGame/TalesOfPhantasia''.]] It doesn't quite go as planned, as shown by the sequel ''VideoGame/TalesofSymphoniaDawnoftheNewWorld''. [[spoiler:Only when Ratatosk (in the Good Ending) decides to rewrite the laws of nature so that life does not need mana to survive does everything ultimately work out.]]

* ''VideoGame/FinalFantasyV'': this is exactly what OmnicidalManiac Exdeath wants to happen and the heroes are trying to ''prevent''. As it turns out, the [[MacGuffin power]] he's after was sealed by splitting the world in two hundreds of years ago, and he can only release it from the Dimensional Rift by reuniting the worlds (which entails the destruction of the [[CosmicKeystone Crystals]], so with or without Exdeath actually claiming his prize and wreaking havoc with it, everybody's pretty much screwed). Exdeath succeeds in reuniting the worlds, so the heroes settle for protecting the merged world.

* ''VideoGame/SuperSmashBrosUltimate'''s World of Light takes place in a land where several locations from existing franchises and original areas have been mashed together. For example, you can leave [[VideoGame/PokemonXAndY Lumiose City]] from the west to get to [[VideoGame/DonkeyKongCountry Kongo Jungle]], or instead go south and find [[Franchise/{{Splatoon}} Moray Towers]] in a neighboring city [[ConsoleCameo made out of Nintendo video game consoles]].