History FanDislikedExplanation / WesternAnimation

* ''WesternAnimation/SouthPark'': "Cartman's Mom is Still a Dirty Slut" reveals that Cartman's father was...his mother, who has both male and female genitalia and impregnated a woman. This reveal ended up being {{retcon}}ned in "201", with this being revealed to be a lie. [[spoiler: Cartman's true father was a former Denver Bronco (it was previously established that Liane Cartman screwed the 1989 Denver Broncos on the night her son was conceived) named Jack Tenorman, the father of Scott Tenorman who Cartman killed and fed to his half-brother in "Scott Tenorman Must Die"]] and pretty much all fans prefer this twist over the original.

* ''WesternAnimation/MyLittlePonyMakeYourMark'': Twilight Sparkle's messages reveals the HappyEndingOverride and changes between G4 and G5 were caused by [[BigBad Opaline]] attempting to steal all magic forcing Twilight [[GodzillaThreshold place it in the Unity Crystals to keep it from her]]. G4 fans saw this as underdeveloped at best for what was supposed to make G5 appeal to them, as Opaline came off as no more powerful and less intelligent than prior villains so seemingly should have been defeated without Twilight having to resort to such and [[SeriesContinuityError failed to address many of the inconsistencies in the setting]]. That the vagueness and contradictions meant it failed to clearly decanonize [[ComicBook/MyLittlePony2022 the comics]] more detailed but even more disliked explanation didn't help.
* ''WesternAnimation/{{Pibby}}'': When pitch documents were shown in Late 2023 describing the Glitch as being a manifestation of ''[[MemeticMutation internet meme culture]]'' of all things, to say people were divided is to put it gently, with some people going as far as to say they were ''glad'' the show didn't get greenlit if that was the intended explanation for the Glitch. While it's unclear if that remained true by the time of the Pilot or even the Adult Swim bumpers, most fan projects generally choose to disregard the internet meme edge entirely in favor of portraying the Glitch as something more along the lines of a more standard [[TheAssimilator assimilator]] or the manifestation of cancelation.

** [[FullyAbsorbedFinale Epilogue]], aired as the season two finale of ''WesternAnimation/JusticeLeagueUnlimited'', reveals that Terry [=McGinnis=] (and by extension his brother Matt) is [[spoiler:a clone of Bruce Wayne, or more accurately his biological son because [[ExtraParentConception Amanda Waller overwrote Warren [=McGinnis=]' DNA with Bruce's]]]]. This is contentious for many fans, and [[CreatorBacklash disliked]] by ''Batman Beyond'''s creator Creator/AlanBurnett, because Amanda Waller's plan to [[spoiler:create a new Batman]], which also required [[spoiler:hiring Phantasm to assassinate the [=McGinnises=] to recreate what inspired Bruce to become Batman, only for her to back out of doing the deed]], only succeeded thanks to ContrivedCoincidence (in the pilot, Terry breaks into the Batcave by complete accident and [[spoiler:a different, more successful murder attempt, albeit only on his father]] inspires him putting on the Batsuit) and undermines Terry's CharacterDevelopment.

** [[FullyAbsorbedFinale Epilogue]], aired as the season two finale of ''WesternAnimation/JusticeLeagueUnlimited'', reveals that Terry [=McGinnis=] (and by extension his brother Matt) is [[spoiler:a clone of Bruce Wayne, or more accurately his biological son because [[ExtraParentConception Amanda Waller overwrote Warren [=McGinnis=]' DNA with Bruce's]]]]. This is contentious for many fans because Amanda Waller's plan to [[spoiler:create a new Batman]], which also required [[spoiler:hiring Phantasm to assassinate the [=McGinnises=] to recreate what inspired Bruce to become Batman, only for her to back out of doing the deed]], only succeeded thanks to ContrivedCoincidence (in the pilot, Terry breaks into the Batcave by complete accident and [[spoiler:a different, more successful murder attempt, albeit only on his father]] inspires him putting on the Batsuit) and undermines Terry's CharacterDevelopment.

* ''WesternAnimation/MyLittlePonyMakeYourMark'': Twilight Sparkle's messages reveals the HappyEndingOverride and changes between G4 and G5 were caused by [[BigBad Opaline]] attempting to steal all magic forcing Twilight [[GodzillaThreshold place it in the Unity Crystals to keep it from her]]. G4 fans saw this as underdeveloped at best for what was supposed to make G5 appeal to them, as Opaline came of as no more powerful and less intelligent than prior villains so seemingly should have been defeated without Twilight having to resort to such and [[SeriesContinuityError failed to address many of the inconsistencies in the setting]]. That the vagueness and contradictions meant it failed to clearly decanonize [[ComicBook/MyLittlePony2022 the comics]] more detailed but even more disliked explanation didn't help.

*** ''Omniverse'' would imply and WordOfGod would confirm that the future seen in ''Omniverse'' was the same one that was seen in the Classic Series' two episodes set in the future, in spite of minor changes[[note]]The original future Ben still possessed the prototype Omnitrix, which recalibrated and was destroyed in ''Alien Force'', this future instead gives him the Biomnitrix, which allows him to fuse his alien forms together[[/note]]. Many fans threw this into FanonDiscontinuity seeing this as the show [[DesignatedLoveInterest continuing to push]] Kai as Ben's true love, despite being [[TheScrappy the least liked of Ben's love interests by far]]. Even non-shippers took issue with this statement for not following the franchise's laws of time travel,[[note]]that any change, no matter how minor, would result in the creation of a new timeline[[/note]] along with the depressing implications that Ben was destined to isolate himself from his family in his devotion to being a hero and that Kevin would end up [[FaceHeelTurn relapsing into villainy at some point]], becoming an AbusiveParent to his son.