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* This is the basic mindset of SelfDemonstrating/SuperboyPrime. Not only is every universe except his own “perfect” world expendable, but he believes he comes from the only real universe, and everywhere and everyone else in the multiverse are just fictional characters. Ergo, it’s perfectly okay to kill them, because they’re not real, and he is.


* The titular heroine of ''ComicBook/{{Naomi}}'' was born in an alternate universe where a MassSuperEmpoweringEvent affected at least 29 individuals -- most importantly Zumbado, a mass murderer who was about to be executed when he gained his superpowers. He proceeded to conquer his Earth, and by the time Naomi visited her homeworld for the first time in seventeen years, it's in a post-apocalyptic state, and Zumbado is interested in invading the main DC Universe. That said, Naomi expresses a desire to rebuild her homeworld.

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* The titular heroine of ''ComicBook/{{Naomi}}'' was born in an alternate universe where a MassSuperEmpoweringEvent affected at least 29 individuals -- most importantly Zumbado, a mass murderer who was about to be executed when he gained his superpowers. He proceeded to conquer his Earth, and by the time Naomi visited her homeworld for the first time in seventeen years, it's in a post-apocalyptic state, and Zumbado is interested in invading the main DC Universe. That said, Naomi expresses a desire to rebuild her homeworld. Indeed, Creator/BrianMichaelBendis [[http://www.cbr.com/naomi-dc-comics-interview-bendis-walker-campbell/ claimed that one of his goals is to establish an intriguing new world for future writers to write stories about]], citing Creator/JackKirby's ''[[ComicBook/NewGods Fourth World]]'' as an example.

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* The titular heroine of ''ComicBook/{{Naomi}}'' was born in an alternate universe where a MassSuperEmpoweringEvent affected at least 29 individuals -- most importantly Zumbado, a mass murderer who was about to be executed when he gained his superpowers. He proceeded to conquer his Earth, and by the time Naomi visited her homeworld for the first time in seventeen years, it's in a post-apocalyptic state, and Zumbado is interested in invading the main DC Universe. That said, Naomi expresses a desire to rebuild her homeworld.


* Defied in ''ComicBook/InfinityWars2018'': while he helps fighting, Soldier Supreme (Captain America & Doctor Strange mashup) objects he doesn't want his life to be undone, even if it means two "more real" heroes will live instead. Adam Warlock promises to try keeping this universe existing while restoring the real one.

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* Defied in ''ComicBook/InfinityWars2018'': ''ComicBook/{{Infinity Wars|2018}}'': while he helps fighting, Soldier Supreme (Captain America & Doctor Strange mashup) objects he doesn't want his life to be undone, even if it means two "more real" heroes will live instead. Adam Warlock promises to try keeping this universe existing while restoring the real one.one, and the so-called "Warp World" continued to exist within the Soul Stone. Marvel returned to the concept of the Warp World a year later in the "Secret Warps" storyline, which officially treats the reality as its own thing.


* ''Series/Arrowverse:''
** ''Series/TheFlash2014'':
*** Deconstructed. The heroes from the main setting of Earth 1 always consider Earth 2 just as legitimate as their own world, but the opposite isn't true as Earth 2 super villain Zoom takes to sending other Earth 2 villains to Earth 1 to kill the Flash. Several of them start out by tracking down their own counterpart and killing them, and even one who's explicitly stated to have never killed anyone before has no problem pulling a KillAndReplace on her counterpart to escape Zoom (though she's horrified when she accidentally kills someone else instead).
*** In the episode "Running To Stand Still" Earth-2 Harrison Wells sends hundreds of bombs through a wormhole to an alternate dimension. No one seems to consider the bombs might be raining down on a bunch of their alternate selves.
*** After the breaches are closed, Wells daughter is rescued [[spoiler:and the apparent death of Jay Garrick]], Barry is told to forget about Earth 2 and move on with his life, saying that Earth 2's world is not his own to worry about. However, after seeing firsthand what it suffers at Zoom's hands, Barry feels guilty for leaving it at his mercy and vows to liberate it from Zoom.
*** The season 2 finale involves [[spoiler:Zoom deciding to eliminate every world in TheMultiverse besides Earth 1 (he still needs someplace to live, after all), forcing Barry to help him generate enough power for the device. However, Barry is determined to prevent that so much that he creates a time remnant for the sole purpose of the latter performing a HeroicSacrifice. In effect, Barry is willing to give his own life in order to save countless billions]].
*** Season Two also made the old ''Series/TheFlash1990'' show part of the universe, and it would be given the designation Earth-90. But it didn't become important to the plot until the 2018 crossover ''Series/{{Elseworlds|2018'', where it's revealed that the Monitor slaughtered the whole Earth and every hero, except the Flash.
** In ''Series/LegendsOfTomorrow'' Season 2 finale, the Doomworld!Legends find themselves on the receiving end of this. They travel back in time to prevent the Legion of Doom from getting the Spear of Destiny and creating [[VillainWorld Doomworld]], and acknowledge that if they are successful they will be erased from existence. [[spoiler:They then get themselves killed fighting the Legion ensuring their counterparts successfully escape with the Spear until only Sara is left, who then peacefully winks out of existence.]]



* ''Series/TheFlash2014'':
** Deconstructed. The heroes from the main setting of Earth 1 always consider Earth 2 just as legitimate as their own world, but the opposite isn't true as Earth 2 supervillain Zoom takes to sending other Earth 2 villains to Earth 1 to kill the Flash. Several of them start out by tracking down their own counterpart and killing them, and even one who's explicitly stated to have never killed anyone before has no problem pulling a KillAndReplace on her counterpart to escape Zoom (though she's horrified when she accidentally kills someone else instead).
** In the episode "Running To Stand Still" Earth-2 Harrison Wells sends hundreds of bombs through a wormhole to an alternate dimension. No one seems to consider the bombs might be raining down on a bunch of their alternate selves.
** After the breaches are closed, Wells daughter is rescued [[spoiler:and the apparent death of Jay Garrick]], Barry is told to forget about Earth 2 and move on with his life, saying that Earth 2's world is not his own to worry about. However, after seeing firsthand what it suffers at Zoom's hands, Barry feels guilty for leaving it at his mercy and vows to liberate it from Zoom.
** The season 2 finale involves [[spoiler:Zoom deciding to eliminate every world in TheMultiverse besides Earth 1 (he still needs someplace to live, after all), forcing Barry to help him generate enough power for the device. However, Barry is determined to prevent that so much that he creates a time remnant for the sole purpose of the latter performing a HeroicSacrifice. In effect, Barry is willing to give his own life in order to save countless billions]].



* In ''Series/LegendsOfTomorrow'' Season 2 finale, the Doomworld!Legends find themselves on the receiving end of this. They travel back in time to prevent the Legion of Doom from getting the Spear of Destiny and creating [[VillainWorld Doomworld]], and acknowledge that if they are successful they will be erased from existence. [[spoiler:They then get themselves killed fighting the Legion ensuring their counterparts successfully escape with the Spear until only Sara is left, who then peacefully winks out of existence.]]


* ''{{Literature/Worm}}'' [[PlayingwithaTrope plays with this]] extensively; the protagonists live on "Earth Bet", regarded as something of a hellhole by the inhabitant of "Earth Aleph" (albeit an interesting one to some people) because they suffer frequent [[CrisisCrossover supervillain-induced disasters]] that kill lots of people. There are careful treaties to avoid war between the two worlds. Theory predicts that Aleph and Bet are the only worlds at the optimum "distance" to each other to include alternate-universe versions of individual people and still be accessible.
* The supervillain [[spoiler:Coil has a power based around this, allowing him to take different actions in two identical timelines and collapse the result he doesn't like. He tortures people for fun in his "throwaway" timelines, although never people so important that it would derail his plans if he was forced to keep that timeline.]] Although he speculates it may just be a simulation.
* Later [[spoiler: [[InvokedTrope invoked]] when it's revealed that all superpowers are transferring energy and matter to and from nearby parallel worlds in order to function, many of which are implied to be nearly identical to the world of the main story except that they're randomly devastated by superpowers.]]
* At one point a portal to another universe is created, and deliberately tuned to an uninhabited world ("Earth Gimel") so that it can be exploited for resources and used for mass evacuation in case of disaster. [[spoiler:Although the sequel reveals there were a few scattered native inhabitants after all.]]

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* ''{{Literature/Worm}}'' [[PlayingwithaTrope plays with this]] extensively; the extensively:
** The
protagonists live on "Earth Bet", regarded as something of a hellhole by the inhabitant of "Earth Aleph" (albeit an interesting one to some people) because they suffer frequent [[CrisisCrossover supervillain-induced disasters]] that kill lots of people. There are careful treaties to avoid war between the two worlds. Theory predicts that Aleph and Bet are the only worlds at the optimum "distance" to each other to include alternate-universe versions of individual people and still be accessible.
* ** The supervillain [[spoiler:Coil has a power based around this, allowing him to take different actions in two identical timelines and collapse the result he doesn't like. He tortures people for fun in his "throwaway" timelines, although never people so important that it would derail his plans if he was forced to keep that timeline.]] Although he speculates it may just be a simulation.
* ** Later [[spoiler: [[InvokedTrope invoked]] when it's revealed that all superpowers are transferring energy and matter to and from nearby parallel worlds in order to function, many of which are implied to be nearly identical to the world of the main story except that they're randomly devastated by superpowers.]]
* ** At one point a portal to another universe is created, and deliberately tuned to an uninhabited world ("Earth Gimel") so that it can be exploited for resources and used for mass evacuation in case of disaster. [[spoiler:Although the sequel reveals there were a few scattered native inhabitants after all.]]



* Canadian scifi series ''Continuum'' plays this kind of loose, given that most of the characters within it don't seem to grasp their own time travel rules. Characters in the earlier seasons openly wonder if their "future" selves and families will continue to exist, or if even the ripple-effects of their mere presence in the past have already altered the timeline so drastically that their own parents will never meet. The mysterious time-traveling conspiracy from even farther in the future - known as "The Freelancers" - give a an explanation in Season 2: ''every'' time-travel event creates a branching timeline, co-existing alongside the original. When Cameron and the Liber8 terrorists traveled back in time, they ''created'' Timeline-2. This is explicitly why they are able to avoid grandfather paradoxes: Kellog's own grandmother was killed in Season 1, but he didn't wink out of existence. This was because it wasn't really ''his'' grandmother from Timeline-1, but an exact duplicate made along with Timeline-2. Thus it is ''impossible'' for Liber8 to prevent the rise of the corporate-ocracy in Timeline-1: all they can do is prevent it from rising in Timeline-2...which wouldn't even have existed in the first place if they hadn't traveled in time. It is also difficult to impossible for Cameron to return to her own son in Timeline-1's 2077.

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* Canadian scifi series ''Continuum'' ''Series/{{Continuum}}'' plays this kind of loose, given that most of the characters within it don't seem to grasp their own time travel rules. Characters in the earlier seasons openly wonder if their "future" selves and families will continue to exist, or if even the ripple-effects of their mere presence in the past have already altered the timeline so drastically that their own parents will never meet. The mysterious time-traveling conspiracy from even farther in the future - known as "The Freelancers" - give a an explanation in Season 2: ''every'' time-travel event creates a branching timeline, co-existing alongside the original. When Cameron and the Liber8 [=Liber8=] terrorists traveled back in time, they ''created'' Timeline-2. This is explicitly why they are able to avoid grandfather paradoxes: Kellog's own grandmother was killed in Season 1, but he didn't wink out of existence. This was because it wasn't really ''his'' grandmother from Timeline-1, but an exact duplicate made along with Timeline-2. Thus it is ''impossible'' for Liber8 [=Liber8=] to prevent the rise of the corporate-ocracy in Timeline-1: all they can do is prevent it from rising in Timeline-2...which wouldn't even have existed in the first place if they hadn't traveled in time. It is also difficult to impossible for Cameron to return to her own son in Timeline-1's 2077.



** ...then it turns out that the new Timeline-3 future is even worse than Timeline-1: Liber8 didn't succeed in stopping the corporations from taking over world government, only weakening them just enough that the fighting stalemated, eventually degenerating into multi-faction anarchy, so that the alternate 2030's are a hellhole of constant warfare...in which Kellog is a major faction leader. Basically, anyone who wants to change their own timeline cannot, but if you just want to create a new timeline/universe where you can live like a king by abusing your knowledge of the (alternate but similar) future timeline, that is possible - which suits Kellog just fine.

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** ...then it turns out that the new Timeline-3 future is even worse than Timeline-1: Liber8 [=Liber8=] didn't succeed in stopping the corporations from taking over world government, only weakening them just enough that the fighting stalemated, eventually degenerating into multi-faction anarchy, so that the alternate 2030's are a hellhole of constant warfare...in which Kellog is a major faction leader. Basically, anyone who wants to change their own timeline cannot, but if you just want to create a new timeline/universe where you can live like a king by abusing your knowledge of the (alternate but similar) future timeline, that is possible - which suits Kellog just fine.


** Averted in ''TransformersMoreThanMeetsTheEye'' with the Functionist Universe. Initially introduced as a possible present that resulted from Megatron dying before he founded the Decepticons, the main cast eventually travels there and actively works to overthrow the Functionist Council, with Megatron staying behind at the end of the story arc to continue the fight. At the very end of the series, The Functionist's invade the main universe and with Megatron close behind having spent many years in that timeline thwarting the Functionist's attempts to exterminate organic life.

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** Averted in ''TransformersMoreThanMeetsTheEye'' ''ComicBook/TransformersMoreThanMeetsTheEye'' with the Functionist Universe. Initially introduced as a possible present that resulted from Megatron dying before he founded the Decepticons, the main cast eventually travels there and actively works to overthrow the Functionist Council, with Megatron staying behind at the end of the story arc to continue the fight. At the very end of the series, The Functionist's invade the main universe and with Megatron close behind having spent many years in that timeline thwarting the Functionist's attempts to exterminate organic life.

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** Averted in ''TransformersMoreThanMeetsTheEye'' with the Functionist Universe. Initially introduced as a possible present that resulted from Megatron dying before he founded the Decepticons, the main cast eventually travels there and actively works to overthrow the Functionist Council, with Megatron staying behind at the end of the story arc to continue the fight. At the very end of the series, The Functionist's invade the main universe and with Megatron close behind having spent many years in that timeline thwarting the Functionist's attempts to exterminate organic life.


* ''ComicBook/XMan'': In ''X-Man #71-74'', Qabiri destroys five alternate Earths, causing all Earth designations to slide down one number each time, which must have [[Main/FanonDiscontinuity never happened]].

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* ''ComicBook/XMan'': In ''X-Man #71-74'', Qabiri destroys five alternate Earths, causing all Earth designations to slide down one number each time, which must have [[Main/FanonDiscontinuity [[FanonDiscontinuity never happened]].



* ''FanFic/TheInfiniteLoops has Loopers refer to this attitude as Sakura Syndrome, and generally frown upon it. Yes, reality is stuck in a time loop but not only will your fellow loopers remember your actions, if you break the world too hard you might wind up in the Eiken Loop [[spoiler:or accidentally [[RetGone destroy your universe.]]]]

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* ''FanFic/TheInfiniteLoops ''FanFic/TheInfiniteLoops'' has Loopers refer to this attitude as Sakura Syndrome, and generally frown upon it. Yes, reality is stuck in a time loop but not only will your fellow loopers remember your actions, if you break the world too hard you might wind up in the Eiken Loop [[spoiler:or accidentally [[RetGone destroy your universe.]]]]






** The ''Myriad Universe'' novella "A Gutted World" is a good example of the KillEmAll attutide to alternate universes. By the end of the story, the entire main casts of ''Series/StarTrekTheNextGeneration'', ''Series/StarTrekDeepSpaceNine'' and ''Series/StarTrekVoyager'' are dead. So is ''the entire Klingon homeworld''.

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** The ''Myriad Universe'' novella "A Gutted World" is a good example of the KillEmAll attutide attitude to alternate universes. By the end of the story, the entire main casts of ''Series/StarTrekTheNextGeneration'', ''Series/StarTrekDeepSpaceNine'' and ''Series/StarTrekVoyager'' are dead. So is ''the entire Klingon homeworld''.



** This is actually ''weaponized'' ,for lack of a better term, in the novel {{Literature/Quarantine}}. In a future when neurological mods can be implanted to alter the workings of the brain, a pair is developed that will A) suppress the user's ability to collapse wave functions by observing them and then B) let them choose from among the infinite possible timelines which one will become real. A person using it can do anything they want, as long as there's even the slightest possibility of it actually occurring. Break locks by picking random combinations, navigate through a crowded room unseen because everyone happened to be looking the other way at the same time, walk through walls via quantum tunneling effects.

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** This is actually ''weaponized'' ,for ''weaponized'', for lack of a better term, in the novel {{Literature/Quarantine}}. In a future when neurological mods can be implanted to alter the workings of the brain, a pair is developed that will A) suppress the user's ability to collapse wave functions by observing them and then B) let them choose from among the infinite possible timelines which one will become real. A person using it can do anything they want, as long as there's even the slightest possibility of it actually occurring. Break locks by picking random combinations, navigate through a crowded room unseen because everyone happened to be looking the other way at the same time, walk through walls via quantum tunneling effects.



** The episode "2010" sees the SG-1 of the year 2010 (ten years in the future of the time the episode aired) come up with a plan to erase their timeline, despite having defeated the Goa'uld with the aid of their allies the Aschen, because they've learned that the Aschen are sterilising ninety percent of Earth's population to make Earth their slaves, with the Tau'ri lacking the resources to oppose the Aschen on their own and concluding that the only way to stop them is to prevent this alliance from ever being formed in the first place.

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** The episode "2010" sees the SG-1 of the year 2010 (ten years in the future of the time the episode aired) come up with a plan to erase their timeline, despite having defeated the Goa'uld with the aid of their allies the Aschen, because they've learned that the Aschen are sterilising sterilizing ninety percent of Earth's population to make Earth their slaves, with the Tau'ri lacking the resources to oppose the Aschen on their own and concluding that the only way to stop them is to prevent this alliance from ever being formed in the first place.



* ''VisualNovel/MuvLuv'' {{Averted|Trope}} where Takeru cares about his friends no matter what universe they're in.

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* ''VisualNovel/MuvLuv'' ''VisualNovel/MuvLuv'': {{Averted|Trope}} where Takeru cares about his friends no matter what universe they're in.


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* Averted in ''VideoGame/RakenzarnFrontierStory'', as the Realmwalkers take every universe as equally important. And as they play the role of GuardianOfTheMultiverse, it is literally their job to make sure all of them stay safe.[[note]]This doesn't stop the game's creator from blowing up a few for a cheap shot at some franchises, though.[[/note]]

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* ''Film/AvengersEndgame'': [[spoiler:Subverted. When Bruce shows up in the past to take the Time Stone from the Ancient One, she refuses, as it will doom her branching universe to extinction. Bruce promises that, with time travel, they can bring it right back to the same instant it was taken (whether that will cause her timeline to merge back into the main one or continue as a branch that isn't doomed to extinction [[TimeyWimeyBall is unclear]]). She initially refuses, since they could die before they have a chance to put the stone back, but she accepts it once she hears that her successor, Doctor Strange, is the one who made the plan possible. At the end of the movie, Steve does use the time machine again to put everything back where it's supposed to be]].


** Averted with Future Trunks' timeline: while most of the characters are dead thanks to the Androids, it's treated as no less important and the Cell Saga even ends with a [[PostScriptSeason Post-Script Episode]] that shows him destroying the evil future versions of Androids 17 and 18 and Cell, bringing peace to his world. [[spoiler:Then played heart-breakingly straight in ''Anime/DragonBallSuper'' where the inhabitants of Trunks' timeline are slaughtered by Goku Black and Future Zamasu, then the entire parallel universe is erased from existence by Future Zeno in order to destroy Zamasu's immortal EldritchAbomination form.]]

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** Averted with Future Trunks' timeline: while most of the characters are dead thanks to the Androids, it's treated as no less important and the Cell Saga even ends with a [[PostScriptSeason Post-Script Episode]] that shows him destroying the evil future versions of Androids 17 and 18 and Cell, bringing peace to his world. [[spoiler:Then played heart-breakingly straight in ''Anime/DragonBallSuper'' where the inhabitants of Trunks' timeline are slaughtered by Goku Black and Future Zamasu, then the entire parallel universe is erased from existence by Future Zeno in order to destroy Zamasu's immortal EldritchAbomination form.form, erasing even the souls of those in the afterlife.]]


* ''LightNovel/FullMetalPanic'': [[spoiler:BigBad Leonard Testarossa treats the main ''FMP!'' timeline as this, since he's convinced that it's a "wrong" universe due to the changes caused by the Yamsk 11 incident, and his ultimate plan is to change history and prevent the incident from happening in order to alter the entire world. Thus, he believes that any action he takes in pursuit of this goal -- up to and including mass murder -- is inconsequential since everyone killed will be alive and well once the timeline is altered. However, it's averted by the protagonists: Leonard's ally Sophia tries to convince Kaname to go along with the plan by showing her a vision of the other world where protagonist Sousuke was an OrdinaryHighSchoolStudent rather than a ChildSoldier with a tragic, bloodstained life. Kaname refuses because, while that Sousuke might be a wonderful person, he's not the same Sousuke she fell in love with[[note]]Of course, it's unclear if Sousuke would even exist in the other timeline; Leonard utterly despises him, so if he had any say in the matter the answer would be "No"[[/note]].]]

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* ''LightNovel/FullMetalPanic'': [[spoiler:BigBad Leonard Testarossa treats the main ''FMP!'' timeline as this, since he's convinced that it's a "wrong" universe due to the changes caused by the Yamsk 11 incident, and his ultimate plan is to change history and prevent the incident from happening in order to alter the entire world. Thus, he believes that any action he takes in pursuit of this goal -- up to and including mass murder -- is inconsequential since everyone killed will be alive and well once the timeline is altered. However, it's averted by the protagonists: Leonard's ally Sophia tries to convince Kaname to go along with the plan by showing her a vision of the other world where protagonist Sousuke was an OrdinaryHighSchoolStudent rather than a ChildSoldier {{Child Soldier|s}} with a tragic, bloodstained life. Kaname refuses because, while that Sousuke might be a wonderful person, he's not the same Sousuke she fell in love with[[note]]Of course, it's unclear if Sousuke would even exist in the other timeline; Leonard utterly despises him, so if he had any say in the matter the answer would be "No"[[/note]].]]


* The ''Series/BuffyTheVampireSlayer''/''Series/StargateSG1'' crossover ''[[https://www.fanfiction.net/s/10057642/1/An-Extraordinary-Journey An Extraordinary Journey]]'' does evoke the SGC's usual philosophy of not worrying too much about alternate universes, but when circumstances send Willow to parallel universes she can't help but try and help her local counterparts, ranging from saving Dawn from a car accident to fighting her magic-corrupted alternate. While Willow once claims that she has adopted this philosophy after [[spoiler:she slightly ascends to kill Adria and is banished to another universe by the other Ascended]], in reality she was just pretending to adopt that philosophy to put the First off-guard until she could contact the Asgard for help getting home.

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* The ''Series/BuffyTheVampireSlayer''/''Series/StargateSG1'' crossover ''[[https://www.fanfiction.net/s/10057642/1/An-Extraordinary-Journey An Extraordinary Journey]]'' does evoke the SGC's usual philosophy of not worrying too much about alternate universes, but when circumstances send Willow to parallel universes she can't help but try and help her local counterparts, ranging from saving Dawn from a car accident to fighting her magic-corrupted alternate. While Willow once claims that she has adopted this philosophy after [[spoiler:she slightly ascends to kill Adria and is banished to another universe by the other Ascended]], in reality she was just pretending not to adopt that philosophy care about this reality to put the First off-guard until she could contact the Asgard for help getting home.

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** Related to this trope is the general deactivation of PlotArmor - no point maintaining StatusQuoIsGod when nobody's ever gonna come back, after all. For whatever reason, this seems to hit ComicBook/SpiderMan particularly hard; if he appears in an issue of ''What If?'', there's about a fifty-fifty shot that he'll get killed off, depowered, or otherwise made unusable.

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