History Main / Doppelmerger

** Homeworld fusions are only allowed between the same gem-type. Rubies, a solider caste who look nearly identical to each other, often combine into one large Ruby to defeat their enemies.

** ''ComicBook/XMen: ComicBook/TheEnd'': It is revealed that Madelyene Pryor isn't just a clone of Jean Grey, but also the aspect of Jean that truly loved Scott, and her no longer being part of Jean is why her and Scott's marriage failed. Madelyene transforms into energy and fuses with Jean, resurrecting her yet again.

** ''ComicBook/{{Champions|2016}}'': A complicated series of events leads to the presence of two Vivians -- one, the original, who was stranded on an alien world and transformed from an android into an organic being, and a second who was built by their father before the first one returned to Earth. In the end, the new Vivian is rendered catatonic after being infected by a computer virus, and the original one ends up transferring her consciousness into her duplicate's body.
** ''ComicBook/{{Guardians of the Galaxy|2020}}'': Moondragon meets another, more heroic version of herself from another universe whose Phyla is also alive. Feeling spiteful and jealous of her doppelganger, Moondragon confronts her and they fight. The heroic Moondragon is victorious, but upon seeing just how lonely and unhappy her counterpart is decides to merge with her. Unfortunately, this also causes the other Phyla to be hostile and resentful towards the 616 Moondragon.
** ''[[ComicBook/XFactor2006 X-Factor]]'': Prior to the events of the series, [[SelfDuplication Jamie Madrox]] spawned several duplicates and sent them across the world to acquire a variety of skills and knowledge, then reabsorb them to acquire what they learned. Throughout the series, Jamie encounters a few rogue duplicates which he also has to reabsorb. This trope gets played for tragedy when Jamie [[spoiler:involuntarily reabsorbs his and Theresa's son as he qualifies as a duplicate of Jamie's]].
** ''ComicBook/XMen: The End'': It is revealed that Madelyene Pryor isn't just a clone of Jean Grey, but also the aspect of Jean that truly loved Scott, and her no longer being part of Jean is why her and Scott's marriage failed. Madelyene transforms into energy and fuses with Jean, resurrecting her yet again.

* ''Series/DoctorWho'': In "The Vanquishers", the Doctor gets split across three places, not fully in any place, but able to psychically communicate with her other selves in a limited way. The personification of Time pulls the three Doctors back together at the end of the episode, though it's more of an act of condescending pity than kindness.
* ''Series/{{The Flash|1990}}'': While trying to evade a missile fired at him by Nicholas Pike, the Flash is transported ten years into the future where Pike has taken over Central City. The Flash then goes back to the exact moment just before the missile launch to stop it, then merges with his past self to deal with Pike.

* ''Series/StarTrekTheOriginalSeries'': In one episode, a TeleporterAccident results in both Captain Kirk and a doglike alien getting turned into two individuals, one of whom has all of their negative traits. They eventually get fused back together in the transporter, and while the alien dies (ostensibly from too much fear), Kirk survives.
* ''Series/{{Supergirl|2015}}'': In the Season 3 finale, Kara comes into contact with Black Kryptonite, which creates a clone of her. The clone is found in [[{{Ruritania}} Kaznia]] and raised as a a loyal communist soldier named Red Daughter. After some time as an antagonist in Season 4, Red Daughter sacrifices her life to save Supergirl and remerges with her.

%% * ''WesternAnimation/TeenTitans'': In "Nevermore", Beast Boy and Cyborg accidentally enter Raven's mindscape where they encounter multiple versions of Raven, [[LiteralSplitPersonality each one representing an aspect of her personality]] (i.e. Pink Raven is happiness, Gray Raven is shyness). When a figment of her abusive demon father Trigon appears to [[BattleInTheCenterOfTheMind fight her]], the Ravens merge into one and defeat him.

* ''Literature/PostSelf'': The [[BrainUploading uploaded]] can create copies called "forks", and forks can create their own forks. When a fork quits, their memories are merged back into any down-tree instances they have, though not to any of their own forks, and if they want to keep running they can create a new fork and immediately quit to send their memories down-tree. [[spoiler:In the second book, the progenitor of the 100-strong and nearly 200-years old Ode clade calls all her surviving forks together to fork and merge their forks with her, and quits after receiving all their memories.]]

* ''VideoGame/Bayonetta3'': In the final battle, [[spoiler:the Bayonettas from the first and second games arrive to aid the Bayonetta of this game. When it becomes clear they cannot beat Singularity individually, all three Bayonettas temporarily merge together.]]

** Black Sperm's ability is to split apart into countless copies and recombine again. The copies can also merge permanently to create a new and more powerful form, with only one of the copies' consciousnesses surviving.
** [[spoiler:When a version of Saitama from a BadFuture travels back in time and [[SetRightWhatOnceWentWrong averts the events that led to his timeline]], he and the past Saitama merge once he's done, forgetting everything that happened to the future Saitama in the process. Since the future Saitama's naked and the past Saitama is fully clothed, the merged Saitama ends up with ClothingDamage revealing his junk.]]

** ''ComicBook/BatmanJamesTynionIV'': Issue #117 reveals that some time before Poison Ivy's [[ComicBook/BatmanTomKing last attack on Gotham]] [[spoiler:The Gardener, fearing Ivy would not survive, made a duplicate of Ivy containing all of Ivy's innocence and hid her away. Some villains tried to use this Ivy duplicate for their own ends but she was rescued by Catwoman and is brought to Ivy by Harley and The Gardener. The two Ivys merge back into one and Ivy finds herself feeling whole again.]]

* ''Literature/SkulduggeryPleasant'': Magicians can animate their reflection using symbol magic if they need a stand in, and then later reabsorb the memories of the reflection back into themselves. [[spoiler:Another example comes up later when Darquesse is split from Valkyrie, and tries to absorb her to become complete again. while not a straight example, she hijacks the body of their reflection in order to do it.]]

* ''Series/{{Smallville}}'': The show has two characters named Zod. One is a disembodied spirit from the Phantom Zone and the other is a clone of the former. After the Zod clone is banished to the Phantom Zone, the two Zods meet and merge together.

* ''Webcomic/TheAdventuresOfDrMcNinja:'' In college, Dr. [=McNinja=] cloned himself multiple times, and his clones scattered to different schools to get degrees in different fields. After graduating, they all fused back together, forming one Doctor with all of their combined knowledge.

* ''WesternAnimation/{{WITCH}}'': Astral Drops are a term for duplicates of the Guardians created using the Heart of Kandrakar, while Altermeres are Astral Drops who become sentient beings. In "H is for Hunted", Will creates an Astral Drop to do her chores for her, but it is turned into an Altermere by [[BigBad Narissa]]. When the Altermere takes a blast from Narissa meant for Will, she re-absorbs her back into her body so her memories and experiences can live on. Unfortunately, these memories include the Altermere witnessing Will's mother kissing her teacher Professor Collins.

Compare SplitPersonalityMerge, in which multiple personalities within one individual merge into one. This trope can also overlap with SiblingFusion if the siblings turn out to be one single individual split into two. If the fusion is made up different timeline variants, this may result in a version of RippleEffectProofMemory where a character is capable of simultaneously remembering multiple timelines that existed at some point. See also an AllianceOfAlternates for alternates of the same person working together as a team. When this is done with multiple timelines or realities, this is called a MergedReality.

** ''ComicBook/BatmanJamesTynionIV'': Issue #117 reveals that some time before Poison Ivy's [[ComicBook/BatmanTomKing last attack on Gotham]] [[spoiler:The Gardner, fearing Ivy would not survive, made a duplicate of Ivy containing all of Ivy's innocence and hid her away. Some villains tried to use this Ivy duplicate for their own ends but she was rescued by Catwoman and is brought to Ivy by Harley and The Gardner. The two Ivys merge back into one and Ivy finds herself feeling whole again.]]

** ''ComicBook/{{Champions|2016}}'': A complicated series of events leads to the presence of two Vivians -- one, the original, who was stranded on an alien world and transformed from an into an organic being, and a second who was built by their father before the first one returned to Earth. In the end, the new Vivian is rendered catatonic after being infected by a computer virus, and the original one ends up transferring her consciousness into her duplicate's body.
** ''ComicBook/{{Guardians of the Galaxy|2020}}'': Moondragon meets another, more heroic version of herself from another universe who's Phyla is also alive. Feeling spiteful and jealous of her doppelganger, Moondragon confronts her and they fight. The heroic Moondragon is victorious, but upon seeing just how lonely and unhappy her counterpart is decides to merge with her. Unfortunately, this also causes the other Phyla to be hostile and resentful towards the 616 Moondragon.

* ''Literature/PostSelf'': The [[BrainUploading uploaded]] can create copies called "forks", and forks can create their own forks. When a fork quits, their memories are merged back into any up-tree instances they have, though not to any of their own forks, and if they want to keep running they can create a new fork and immediately quit to send their memories down-tree. [[spoiler:In the second book, the progenitor of the 100-strong and nearly 200-years old Ode clade calls all her surviving forks together to fork and merge their forks with her, and quits after receiving all their memories.]]

* ''Literature/PostSelf'': The [[BrainUploading uploaded]] can create copies called "forks", and forks can create their own forks. When a fork quits, their memories are merged back into any up-tree instances they have, though not to any of their own forks, and if they want to keep running they can create a short-lived fork that will immediately quit and send their memories up-tree. [[spoiler:In the second book, the progenitor of the 100-strong and nearly 200-years old Ode clade calls all her surviving forks together to fork and merge their forks with her, and quits after receiving all their memories.]]

* ''WesternAnimation/TeenTitans'': In "Nevermore", Beast Boy and Cyborg accidentally enter Raven's mindscape where they encounter multiple versions of Raven, [[LiteralSplitPersonality each one representing an aspect of her personality]] (i.e. Pink Raven is happiness, Gray Raven is shyness). When a figment of her abusive demon father Trigon appears to [[BattleInTheCenterOfTheMind fight her]], the Ravens merge into one and defeat him.

** Ghosts and ghost-human hybrids are able to duplicate themselves into multiple copies using their ectoplasmic energy. The clones gain all the characteristics, memories, and abilities of the original, but are self-thinking (and grow somewhat weakened the more copies they make). The original can re-absorb their clone when need, and clones will automatically be reabsorbed if they are significantly weakened or pushed together with enough force. Ghost-human hybrids in particular are able to do this in both forms

* ''WesternAnimation/AmericanDragonJakeLong'': "The Doppelganger Gang" has Jake use a magic potion to make copies of himself to balance his magical duties and his personal life. Unfortunately, he unintentionally creates an EvilDoppelganger using the wrong potion and said doppelganger absorbs the other Jakes and then attempts to do the same to the real Jake himself.

* ''Webcomic/ElGoonishShive'': A variation happens with Ellen Dunkel. While Ellen, an OppositeSexClone of Elliot, never re-merges with him, she instead is given memories from an alternate dimension Ellen [[note]] A number of alternate versions of the main universe's Elliot Dunkel happen to be female [[/note]] through dreams, in order to reach the same spiritual age as her physical age. The two Ellens never physically merge, but Ellen experiences Second Life Ellen's memories as if they were hers, which help her grow into her own person separate from Elliot's clone (though she later admits the attraction to men she experienced in the Second Life memories felt tacked on).

* ''Webcomic/TheAdventuresOfDrMcNinja:'' This is the explanation for how Dr. [=McNinja=] became an OmnidisciplinaryScientist. In college, he cloned himself multiple times, and his clones scattered to different schools to get degrees in different fields. After graduating, they all fused back together, forming one Doctor with all of their combined knowledge.

* ''VideoGame/PrinceOfPersia1'': Early into the game, the Prince has to break a MagicMirror blocking his path, inadvertently creating Shadow Man]], [[EvilDoppelganger an evil version of himself]] in the process. Late into the game, the Prince confronts this doppelgänger, who can?t be fought traditionally, due to their connection [[PuzzleBoss meaning the Prince takes damage and dies whenever Shadowman does]]. The solution to this is for the Prince to [[SheatheYourSword sheathe his sword]], which makes Shadow Man do the same, and the two merge into one.