History WalkingSpoiler / WesternAnimation

* In ''WesternAnimation/{{Disenchantment}},'' all we know about Queen Dagmar is that she's Bean's MissingMom and TheLostLenore for Zog. In the last two episodes of season one we discover that she's not dead, just TakenForGranite, and that Zog's search for the Elixir of Life was to revive her. And ''then'' we find out that she's been EvilAllAlong.

* In ''WesternAnimation/{{Disenchantment}},'' all we know about Queen Dagmar is that she's Bean's MissingMom and TheLostLenore for Zog. In the last two episodes we discover that she's not dead, just TakenForGranite, and that Zog's search for the Elixir of Life was to revive her rather than gain immortality. And ''then'' we find out that she's been EvilAllAlong, with the other villains' apparent goal being to trick the heroes into reviving her.

* ''WesternAnimation/OKKOLetsBeHeroes'' has Laserblast and Professor Venomous. As of season 3, it's impossible to talk about either of them without revealing that [[TwoAliasesOneCharacter they're the same person]].

** Trying to say ''anything'' about Garnet will quickly lead to mentioning that she's compromised of Ruby and Sapphire, and vice versa.

** White Diamond, the reclusive fourth member of the Diamond Authority, wasn't directly mentioned on the show until late in Season 5. Her first appearance, in [[Recap/StevenUniverseS5E24LegsFromHereToHomeworld "Legs From Here to Homeworld"]] has her casually revealing that she knew the truth about Pink Diamond, Rose Quartz, and the Gem War ''all along''.

* Flopin and Elely from ''WesternAnimation/{{Wakfu}}''. They're Sadlygrove and Evangelyne's children, which spoil the fact that Sadlygrove comes BackFromTheDead in Season 2, his relatinship with Evangelyne continues and surpasses all the roadblocks it faces, and that Evangelyne will become pregnant sometime before the end of that season.

** Likewise, you can't talk about Lena without mentioning that she's Magica de Spell's "niece," which gets even worse by the season one finale and learn that she was actually Magica's shadow, before becoming attached to Webby after Magica loses her powers.

** As a result of being tied to the above-mentioned Della, all of the Lunarians qualify as this, as it's difficult to talk about them without revealing that Della got trapped on the moon for ten years. This especially applies to General Lunaris, the BigBad of season 2, as the fact that he was evil wasn't revealed until his second appearance.

* ''WesternAnimation/MiraculousLadybug'' has [[ForcedIntoEvil Nooroo]] and [[TurtlePower Wayzz]], whose very existence reveals that there are active [[TransformationTrinket Miraculous]] users besides [[TheHero Marinette]] and [[TheLancer Adrien]].

** A a result of being tied to the above-mentioned Della, all of the Lunarians qualify as this, as it's difficult to talk about them without revealing that Della got trapped on the moon for ten years. This especially applies to General Lunaris, the BigBad of season 2, as the fact that he was evil wasn't revealed until his second appearance.

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[[folder:''Adventure Time'']]

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[[folder:''My Little Pony'']]
* ''WesternAnimation/MyLittlePonyFriendshipIsMagic''
** Changelings. [[OutsideContextProblem Their very first appearance in the series was a spoiler]], as even promotional material for the Season 2 finale made the episode seem to be about wedding hijinks at worse and clone shenanigans at best.
** Twilight Sparkle, aka ''the show's main character''. There's no getting around the fact that she became a [[RoyalsWhoActuallyDoSomething Princess]] home at the end of the third season. Her new [[WingedUnicorn wings]] are dead giveaways.
** You can't talk about [[MadGod Discord]] without revealing he goes through a HeelFaceTurn, [[HeelFaceRevolvingDoor before trying out villainy again]] before earnestly redeeming himself.
** [[AbusiveParents Spoiled]] [[RichBitch Rich]], introduced in "Crusaders of the Lost Mark", is impossible to discuss without revealing that this is the episode where the titular Cutie Mark Crusaders receive their cutie marks. Naturally, the Cutie Mark Crusaders themselves serve as this after the episode as well.
** The Changelings are actually this trope TWICE, due to the entire species undergoing a HeelRaceTurn in the Season 6 finale, physically changing their appearance in the process. Thorax is a natural extension of this, as he's the TokenHeroicOrc who helped caused the change to begin with. Of course, talking about that episode is impossible without...
** Discussing [[IndividualityIsIllegal Starlight]] [[WellIntentionedExtremist Glimmer]]. Talking about the character after Season 5 is impossible without revealing that she pulled a HeelFaceTurn at the end of it and became the [[SixthRanger seventh ranger]] to the Mane Six.
*** To know of Sunburst's existence is to know of Starlight's FreudianExcuse for why she became evil. And to know of Sunburst is to also know of...
** Princess Flurry Heart. Yes, ponies can be born as alicorns and Twilight is now an aunt.
* ''WesternAnimation/MyLittlePonyEquestriaGirls''
** It's impossible to talk about [[WesternAnimation/MyLittlePonyEquestriaGirls2013 the first film]]'s BigBad Sunset Shimmer without talking about [[TheAtoner her redemption arc]] in the second film, which in turn leads to her becoming TheLeader of the human Elements of Harmony from the third movie onwards.
** You can't talk about Human Twilight Sparkle without discussing the events of the third movie, with her undergoing a similar OneWingedAngel transformation that Sunset did in the first film.
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* ''WesternAnimation/Ducktales2017'':

** For a character who literally appears out of nowhere midway through Season 1, Toffee has a ''lot'' of hidden secrets regarding his [[{{Fingore}} distinctive appearance]], his goals, and his past, most of which (especially past Season 1) are very difficult to explan without spoiling someone.

** Lapis Lazuli and her introductory episodes, [[Recap/StevenUniverseS1E25MirrorGem "Mirror Gem"]] and [[Recap/StevenUniverseS1E26OceanGem "Ocean Gem"]] revealed that the Crystal Gems are not the [[LastOfHisKind Last of Their Kind]], and that they are an intergalactic race where the majority of members aren't fond of Earth ''at all''. Talking about Lapis means spoiling the twist that much of the series is predicated on, with other reveals found in that episode (such as the [[MonsterOfTheWeek monsters]] being corrupted Gems) also getting discussed in that conversation.

** Lapis Lazuli reveals that the Crystal Gems are not the [[LastOfHisKind Last of Their Kind]], and that there is another faction of gems that does ''not'' care about Earth. Her introductory episodes, [[Recap/StevenUniverseS1E25MirrorGem "Mirror Gem"]] and [[Recap/StevenUniverseS1E26OceanGem "Ocean Gem"]], set the stage for the entire plot to come and reveal a good deal of context behind previous episodes, such as the [[MonsterOfTheWeek Gem Monsters]] being corrupted gems.
** In a similar vein, Peridot shows that whatever happened in the Gem Homeworld is extremely distressing, to the point where Garnet smashes the warp pad so they can stay stranded.
** Trying to say ''anything'' about Ruby and Sapphire necessitates spoiling that they are part of the main cast, constantly fused into Garnet.

** Pink Diamond's mere existence is somewhat of a spoiler, to the point where the first mention of her name was a WhamLine. Her character in general and what became of her is a '''mega''' spoiler that gives a different context to multiple characters and the show's backstory.
** Rose Quartz has been a part of the show from the beginning, and it's not a spoiler that she's Steven's mom and the former leader of the Crystal Gems. Any mention of her pre-Greg past (along with Pearl's, since their stories are intertwined) is probably the '''biggest''' spoiler of all.
** Pink Diamond's Pearl was first brought up in Steven's trial for Pink Diamond's shattering, and her connections and role in the event are a source of major questions about what actually happened. What really happened to her and where she is now is directly connected to Pink Diamond's true fate, and it's difficult to talk about her without revealing that she's one of the main characters.
** White Diamond, the reclusive fourth member of the Diamond Authority, wasn't directly mentioned on the show until late in season 5, her existence having been inferred from both versions of the Diamond sigil and the murals in Pink Diamond's moonbase, as well as a mention in an artbook. Her first appearance, in [[Recap/StevenUniverseS5E24LegsFromHereToHomeworld "Legs From Here to Homeworld"]], implies that [[spoiler:she may have known about Pink's SecretIdentity ''all along'',]] not to mention that she's a HumanoidAbomination who's different from every other Gem we've ever seen, and ''why'' is a complete mystery. Her Pearl, the first member of her court to appear in the show, also qualifies.

** Rose Quartz has been a part of the show from the beginning, and it's not a spoiler that she's Steven's mom and the former leader of the Crystal Gems. Any mention of her pre-Greg past (along with Pearl's, since their stories are intertwined) is probably the '''biggest''' spoiler of all, [[spoiler:since she and the above WalkingSpoiler Pink Diamond are the same person]]. It's so spoilery that we can't even show it unspoilered in a page ''about'' spoilers.

** White Diamond, the reclusive fourth member of the Diamond Authority, wasn't directly mentioned on the show until late in season 5, her existence having been inferred from both versions of the Diamond sigil and the murals in Pink Diamond's moonbase, as well as a mention in an artbook. Her first appearance, in [[Recap/StevenUniverseS6E1LegsFromHereToHomeworld "Legs From Here to Homeworld"]], implies that [[spoiler:she may have known about Pink's SecretIdentity ''all along'',]] not to mention that she's a HumanoidAbomination who's different from every other Gem we've ever seen, and ''why'' is a complete mystery. Her Pearl, the first member of her court to appear in the show, also qualifies.

** White Diamond, the reclusive fourth member of the Diamond Authority, wasn't directly mentioned on the show until late in season 5, her existence having been inferred from both versions of the Diamond sigil and the murals in Pink Diamond's moonbase, as well as a mention in an artbook. Her first appearance, in [[Recap/StevenUniverseS5E24LegsFromHereToHomeworld "Legs From Here to Homeworld"]], implies that [[spoiler:she may have known about Pink's SecretIdentity ''all along'',]] not to mention that she's a HumanoidAbomination who's different from every other Gem we've ever seen, and ''why'' is a complete mystery. Her Pearl, the first member of her court to appear in the show, also qualifies.

* Just even ''mentioning'' that Della Duck is part of the ''WesternAnimation/Ducktales2017'' reboot falls under this, as the show's first StoryArc covers her disappearance, while the tie-in comics include stories where she's adventuring with Scrooge and Donald. Likewise, you can't talk about Lena without mentioning that she's Magica de Spell's "niece."

* Just even ''mentioning'' that Della Duck is part of the ''WesternAnimation/Ducktales2017'' reboot falls under this, as the show's first StoryArc covers her disappearance, while the tie-in comics include stories where she's adventuring with Scrooge and Donald. Likewise, you can't talk about Lena without mentioning that she's Magica de Spell's niece.

** White Diamond, the reclusive fourth member of the Diamond Authority, wasn't even ''mentioned'' until late in season 5. Her first appearance, in [[Recap/StevenUniverseS5E24LegsFromHereToHomeworld "Legs From Here to Homeworld"]], implies that [[spoiler:she may have known about Pink's SecretIdentity ''all along'',]] not to mention that she's a HumanoidAbomination who's different from every other Gem we've ever seen, and ''why'' is a complete mystery. Her Pearl, the first member of her court to appear in the show, also qualifies.

** During the TimeSkip between his last season 2 appearance and the beginning of season 3 (at least eight months), recurring antagonist Agent Kallus goes through a HeelFaceTurn and becomes [[ReverseMole a Rebel spy]], one of the Fulcrum agents. In the second half of season 3, he gets found out by his boss, and in the season finale "Zero Hour" ends up escaping and formally joining up with the rebels. It's near-impossible to talk about him in season 3, and outright impossible in season 4, without giving this away. Pictures of him from season 4, with his GoodCostumeSwitch, also spoil this.

** Bismuth has a major role in Lapis' backstory, and delving into her character in any depth reveals that she's a KnightTemplar and the antagonist of [[Recap/StevenUniverseS3E20Bismuth her episode]].