History ContentLeak / WesternAnimation

** "Fionna and Cake" and "Hot to the Touch" were leaked illegally on Website/YouTube days before their premiere. Fans in denial about the former's ending revealing that the genderbent characters were the product of Ice King's fanfiction actually believed it was a dupe intentionally leaked by the show staff to throw fans off of a massive plot twist (alas, what they saw was what they got come Labor Day 2011).

* ''WesternAnimation/TheMrMenShow'': Many scenes from the second season were shown on certain animation demos on Website/YouTube before the actual episodes they were apart of aired.

** The first two episodes of season two, "Separate Tides" and "Escaping Expulsion" were leaked onto Website/YouTube following the early screening, a full week before the first one was supposed to air normally and two before the second was.

* ''WesternAnimation/SpongeBobSquarePants'': A full animatic of "Gary & Spot" was uploaded by Vincent Waller, the show's co-executive producer, on his Website/YouTube channel in late February 2019. It got pulled after just a few hours. "Gary & Spot" mistakenly aired in the United Kingdom at ''4 AM'' on March 16th. It didn't officially premiere in the United States until July 27th.

** The season 2 finale "True Colors" was meant to air on May 1, 2021, but was delayed due to concerns surrounding Marcy being stabbed at the end. Unfortunately, since the scheduling change was announced less than 18 hours before its intended airing, iTunes didn't get the memo and they put the episode up for purchase on May 2nd. By the time the episode was removed, the damage was already done, and clips of the episode's final minutes were all over the internet by day's end.

* ''WesternAnimation/TheLoudHouse'': The episodes "Future Tense", "Head Poet's Anxiety", "The Mad Scientist", "Tripped!" and "The Loudest Thanksgiving" were all leaked online on Amazon before their official airdate.

** The season 2 finale "True Colors" was meant to air on May 1, 2021, but was delayed in favour of focusing wholly on the network's "Halfway to Halloween" event instead. Unfortunately, since the scheduling change was announced less than 18 hours before its intended airing, iTunes didn't get the memo and they put the episode up for purchase on May 2nd. By the time the episode was removed, the damage was already done, and clips of the episode's final minutes were all over the internet by day's end.

* ''WesternAnimation/TotalDrama'': In Italy, the first episode of the second part of the 2023 series was leaked by accident before its release date of December 4th, but it has been removed.

** A promotional trailer showcasing the animation and the voices of some of the cast was leaked on the internet in January 2021. Although Mattel took the original down, it had already gone viral.

** On January 5th, 2023, the entire duration of "For the Future" was leaked from iTunes, over two full weeks before it officially airs.

** On January 5th, 2023, the entire duration of "For the Future" was leaked from iTunes.

** A promotional trailer for the series was leaked on the internet in late January 2021, thus showcasing the animation, the changes, and of course, the voices of Thomas and newcomer Kana. [[TheyChangedItNowItSucks Needless to say, many Thomas fans were not happy]]. Mattel deleted the original upload, but the damage was done and almost every Thomas fan saw it.

** Days after "Hunting Palismen" aired, a DeletedScene from that very episode was leaked online by a crew member.

** The titles for the three Season 3 episodes (including "Thanks to Them") and some of its background drawings were leaked online well before their actual airdates.

** A promotional trailer of the series was leaked on the internet in January 2021, thus showcasing the animation, the changes, and of course, the voices of Thomas and newcomer Kana. [[TheyChangedItNowItSucks Needless to say, many Thomas fans were not happy]]. Mattel deleted the original upload, but the damage was done and almost every Thomas fan saw it.

* The ''WesternAnimation/{{Amphibia}}'' season 2 finale "True Colors" was meant to air on May 1, 2021, but was delayed in favour of focusing wholly on the network's "Halfway to Halloween" event instead. Unfortunately, since the scheduling change was announced less than 18 hours before its intended airing, iTunes didn't get the memo and they put the episode up for purchase on May 2nd. By the time the episode was removed, the damage was already done, and clips of the episode's final minutes were all over the internet by day's end.

* ''WesternAnimation/SpongeBobSquarePants'': A full animatic of "Gary & Spot" was uploaded by Vincent Waller, the show's co-executive producer, on his YouTube channel in late February 2019. It got pulled after just a few hours. "Gary & Spot" mistakenly aired in the United Kingdom at ''4 AM'' on March 16th. It didn't officially premiere in the United States until July 27th.

** A promotional trailer of the series has been leaked on the internet, thus showcasing the animation, the changes, and of course, the voices of Thomas and newcomer Kana. [[TheyChangedItNowItSucks Needless to say, many Thomas fans were not happy]]. Mattel deleted the original upload, but the damage was done and almost every Thomas fan saw it.

* ''WesternAnimation/SpongeBobSquarePants'': A lot of season 12 episodes had aired in foreign countries or been leaked through online providers before their official airings.
** A full animatic of "Gary & Spot" was uploaded by Vincent Waller, the show's co-executive producer, on his YouTube channel in late February 2019. It got pulled after just a few hours. "Gary & Spot" mistakenly aired in the United Kingdom at ''4 AM'' on March 16th. It didn't officially premiere in the United States until July 27th.
** "Pinapple RV" is infamous for this. It premiered in Poland on May 28, 2019, and aired in America ''over a year later'' on July 17, 2020. Many other countries had got it earlier, too.
** In early June 2019, the UK and Ireland premiered some episodes that wouldn't air in the US until later. This includes "King Plankton" and "Stormy Weather" (US premiere: June 22nd), "Sandy's Nutty Nieces" (US premiere: June 29th), and "The Krusty Bucket" (US premiere: August 10th).
** "Plankton's Old Chum" was released on Sky in Italy on June 9, 2019. Its US premiere was on November 30th.
** "Swamp Mates" and "One Trick Sponge" aired in Russia on December 12, 2019. They didn't premiere in the United States until April 11, 2020, and even "Swamp Mates" was aired on Nickelodeon UK two months prior, on February 25, 2020 (also the first time the episode was released in English).
** "Squid's on a Bus" premiere in Russia on July 27, 2019. It wasn't released in the US until September 28th.
** "Jolly Lodgers" and "Biddy Sitting" were briefly available on Amazon Prime for a few minutes on July 31, 2019. "Biddy Sitting" premiered in the US on February 8, 2020, with "Jolly Lodgers" a month later on March 7, 2020.

** More leaks might end up happening thanks to [[ShortRunInPeru Mexico premiering the series before any other country]]!

** "Pinapple RV" is infamous for this. It premiered in Poland on May 28, 2019, and aired in America ''over a year later'' on July 17, 2020.

* ''WesternAnimation/TheMrMenShow'': Many scenes from the second season were shown on certain animation demos on YouTube before the actual episodes they were apart of aired.

''WesternAnimation/TheMrMenShow'': Many scenes from the second season were shown on certain animation demos on YouTube before the actual episodes they were apart of aired.