History TrailersAlwaysSpoil / WesternAnimation

** Trailers for ''All Stars'' not only shows Alejandro out of the robot, but also Lindsay and Jo's elimination.

** For a particularly JustForFun/{{egregious}} one, the beginning of the trailer for ''WesternAnimation/TeenTitansGo'''s "Justice League's Next Top Talent Idol Star" (no, that's not a typo) Shows that Robin, Raven, and Cyborg were the final contestants.

* Promos for the second season premiere of ''WesternAnimation/XMen'' blatantly spoiled that Morph was back from the dead and now evil.

* The Season 2 preview of ''WesternAnimation/{{Amphibia}}'' spoils a few scenes, such as [[spoiler:Anne fighting Sasha again, Anne and the Plantars finding Anne's other friend Marcie, and as far as the posters show, Anne holding the Calamity Box, hinting she retrieves it sometime when the season begins.]]

* Previews for the ''WesternAnimation/RockosModernLife'' special ''[[WesternAnimation/RockosModernLifeStaticCling Static Cling]]'' spoiled the reveal that the character formally known as Ralph [[spoiler:[[{{Transgender}} transitioned]] into a woman named Rachel]]. Most of the LGBTFanbase wasn't upset at the spoiler because the possibility of accurate representation in a kids' show [[Administrivia/TropesAreTools just got them more excited.]]

** ''WesternAnimation/StevenUniverse''
*** And if the trailer for "Giant Woman" is any indication, ''Steven Universe'' might be starting to fall victim to this too.
*** A promo shown during [=StevenBomb=] 4 showed a clip from "Barn Mates" spoiling [[spoiler:the return of Lapis Lazuli]], which aired a full four months later.

* ''WesternAnimation/StevenUniverse'' tends to get hit very, very hard with this trope.
** In the few days after Stevenbomb 4 alone, 2 clips were released on Cartoon Network's UK site as promos that revealed [[spoiler:the return of Malachite and Lapis Lazuli]], with said episode not airing until four months later.
** It's arguably worse with the "Steven's Summer Adventures" event, during which the network aired the entire third season within a month and released significant portions of almost every episode early as "sneak peeks". In a particularly irritating move, they also uploaded clips and made news articles surrounding [[spoiler:Bismuth being introduced, in which it is also shown that Amethyst has received another design change]]. It kind of makes you wonder whether any major development in the show will ever be allowed to go un-spoiled ever again.
** Possibly the most notorious case was in May 2018, due to it being an accident rather than an intentional marketing choice by the network. As part of a miniseries about animation production called "Drawn Podcast", Cartoon Network released an interview with Rebecca Sugar and Ian J.Q. In the video were short clips of unreleased episodes that were regarded as major spoilers for the remainder of the season, the most damning one being the final clip, which [[spoiler:showed Steven peacefully interacting with Blue and Yellow Diamond before being set down next to the Crystal Gems, which includes a un-bubbled Bismuth]]: something that greatly changes the show's StatusQuo. Even worse, this came after many members of the Crewniverse begged the fandom not to spoil upcoming episodes. Needless to say, fans were ''furious'' at the network and [[http://hilaryflorido.tumblr.com/post/173496729353 members of the Crewniverse]] [[http://rocks-tumbled.tumblr.com/post/173528783431/ian-jqs-statement-on-the-leaks were pretty distraught]][[note]]Ian's original tweet is now deleted[[/note]]. The video was quickly pulled by the network upon realization and reuploaded without the spoilery parts, but by then the damage was done. Most of the spoiled episodes would air two months later, with the episode featuring that final clip premiering online the following month.

** And if the trailer for "Giant Woman" is any indication, ''WesternAnimation/StevenUniverse'' might be starting to fall victim to this too.

*** Before the ''WesternAnimation/ThePowerpuffGirls2016'' Episode Power-up Puff aired The [[https://www.youtube.com/watch?v=nb920xI_NrM Teaser]] [[spoiler:shows Blossom finally getting her new powers.]]
*** The Russian version of Cartoon Network has proved to be extremely spoiler filled twice so far. First, it revealed ''WesternAnimation/{{Unikitty}}'' before Cartoon Network announced the show, and then revealed what Bliss looked like prior to the Power of Four PPG 2016 special.

-->'''Narrator''': Will Professor Chaos succeed? Which boy will replace Kenny? Which adult cast member will [[TonightSomeoneDies die]]? These questions will be answered... [[spoiler:[[ToBeContinuedRightNow right now]]. No, Tweek, and Ms. Choksondik.]]

* The Season 1B trailer for ''WesternAnimation/TheOwlHouse'' spoils a scene where [[spoiler:Luz's mother winds up on the Boiling Isles.]]

** Possibly the most notorious case thus far was in May 2018, due to it being an accident rather than an intentional marketing choice by the network. As part of a miniseries about animation production called "Drawn Podcast", Cartoon Network released an interview with Rebecca Sugar and Ian J.Q. In the video were short clips of unreleased episodes that were regarded as major spoilers for the remainder of the season, the most damning one being the final clip, which [[spoiler:showed Steven peacefully interacting with Blue and Yellow Diamond before being set down next to the Crystal Gems, which includes a un-bubbled Bismuth]]: something that greatly changes the show's StatusQuo. Even worse, this came after many members of the Crewniverse begged the fandom not to spoil upcoming episodes. Needless to say, fans were ''furious'' at the network and [[http://hilaryflorido.tumblr.com/post/173496729353 members of the Crewniverse]] [[http://rocks-tumbled.tumblr.com/post/173528783431/ian-jqs-statement-on-the-leaks were pretty distraught]][[note]]Ian's original tweet is now deleted[[/note]]. The video was quickly pulled by the network upon realization and reuploaded without the spoilery parts, but by then the damage was done. Most of the spoiled episodes would air two months later, with the episode featuring that final clip premiering online the following month.

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** There's the episode "[Recap/PhineasAndFerbCandaceGetsBusted Candace Gets Busted]]". In order: It starts off as an intimate get-together, she has no problem inviting a few more people, but then it becomes a party, Linda calls the house and says they're coming home. Then guess what happens? [[ExactlyWhatItSaysOnTheTin "Young lady, you are so busted!"]]

** ''Every single trailer'' for "Summer Belongs To You" spoils the ending where the gang arrives back home and celebrates with a concert. There's also a scene of them jumping a gorge without their Sun Beater 9000.
** There's the episode "Candace Gets Busted". In order: It starts off as an intimate get-together, she has no problem inviting a few more people, but then it becomes a party, Linda calls the house and says they're coming home. Then guess what happens? [[ExactlyWhatItSaysOnTheTin "Young lady, you are so busted!"]]
*** To be fair, if you couldn't guess that was going to happen based on [[SpoilerTitle the title]], well...
*** The Latin America dub averts this, where the episode is renamed "Candace's Party".
** Then there's "Minor Monogram", where the commercials literally only showed the ending where [[spoiler:Vanessa falls for Monty]].
** The GrandFinale completely spoils the end finale number "Curtain Call (Time Spent Together)".

* The Season 2 preview form ''WesternAnimation/{{Amphibia}}'' spoils a few scenes, such as [[spoiler:Anne fighting Sasha again, Anne and the Plantars finding Anne's other friend Marcie, and as far as the posters show, Anne holding the Calamity Box, hinting she retrieves it sometime when the season begins.]]

** The GrandFinale completely spoils the end finale number "Curtain Call (Time Spent Together).

* ''WesternAnimation/StarWarsTheCloneWars'' restrained itself fairly well when it comes to foreshadowing Anakin's eventual transformation into Darth Vader, so naturally Cartoon Network was eager to promote [[Recap/StarWarsTheCloneWarsS3E17GhostsOfMortis an episode]] where Anakin has a vision of what he will become. Some pretty sweet clips were shown in the promos, but when the actual episode was aired, you realized they showed you the whole scene!

** The synopsis for "Battle for the Pride Lands" says Kion and Ono are injured in the battle against Scar and his army, which is indeed what happens to them near the end. It even spoils the very end where they leave in search of the Tree of Life, which [[WrittenInAbsense explains]] [[SimultaneousArcs their whereabouts]] in ''Simba's Pride''.

* Played with in ''{{WesternAnimation/Archer}}''. The first episode of season 5 ends with a FantasySequence of Archer's that serves as a trailer for the rest of the season. It did include some genuine spoilers, but they were interlaced with things that never happened (like [[spoiler: Cherlene getting kidnapped]]) and things that happened in completely different circumstances (like [[spoiler: Lana going into labor]]).

* A promo for ''WesternAnimation/WowWowWubbzy'''s week-long second-season premiere event that airs one episode a day, also known as Wub Week, focused on Daizy, who was just introduced. One of the clips showed Daizy kicking a kickity-kick ball from the episode "Who's That Girl?," spoiling the ending of said episode.

* Previews for the ''WesternAnimation/RockosModernLife'' special ''Static Cling'' spoiled the reveal that the character formally known as Ralph [[spoiler:[[{{Transgender}} transitioned]] into a woman named Rachel]]. Most of the LGBTFanbase wasn't upset at the spoiler because the possibility of accurate representation in a kids' show [[Administrivia/TropesAreTools just got them more excited.]]

** The [=YESvember=] music video on Nickelodeon's [=YouTube=] channel includes a scene from the episode ''11 Louds a Leapin''', spoiling [[spoiler:the reveal of Mr. and Mrs. Loud's faces]].

* ''WesternAnimation/PhineasAndFerb'' has the episode "Candace Gets Busted". In order: It starts off as an intimate get-together, she has no problem inviting a few more people, but then it becomes a party, Linda calls the house and says they're coming home. Then guess what happens? [[ExactlyWhatItSaysOnTheTin "Young lady, you are so busted!"]]
** To be fair, if you couldn't guess that was going to happen based on [[SpoilerTitle the title]], well...
*** Then there's "Minor Monogram", where the commercials literally only showed the ending where [[spoiler:Vanessa falls for Monty]].

* Previews for the ''WesternAnimation/RockosModernLife'' special ''Static Cling'' spoiled the reveal that the character formally known as Ralph [[spoiler:[[{{Transgender}} transitioned]] into a woman named Rachel]]. Most of the LGBTFanbase wasn't upset at the spoiler because the possibility of accurate representation in a kids' show [[TropesAreNotBad just got them more excited.]]

*** Meanwhile, the synopsis for the season finale indicates [[spoiler:Cozy Glow]] intends to take over the School of Friendship despite said character having been introduced as a simple one-shot character about halfway through the season.

* ''WesternAnimation/StevenUniverse'' tends to get hit very, very hard with this trope. In the few days after Stevenbomb 4 alone, 2 clips were released on Cartoon Network's UK site as promos that revealed [[spoiler: the return of Malachite and Lapis Lazuli]], with said episode not airing until four months later.
** It's arguably worse with the "Steven's Summer Adventures" event, during which the network aired the entire third season within a month and released significant portions of almost every episode early as "sneak peeks". In a particularly irritating move, they also uploaded clips and made news articles surrounding [[spoiler: Bismuth being introduced, in which it is also shown that Amethyst has received another design change]]. It kind of makes you wonder whether any major development in the show will ever be allowed to go un-spoiled ever again.