History MissingEpisode / WesternAnimation

** The episode "Serious Business" gets little airtime on Cartoon Network in the United States due to being (unintentionally) aired around the time other stations [[BreakingNewsInterruption broke into news reports]] about shootings and bombings (the episode's plot involved a running gag where their bathroom explodes after 5 minutes). After this happened twice, Cartoon Network removed the episode out of regular rotation and it has only aired in marathons ever since, though it did air paired with a ''WesternAnimation/VictorAndValentino'' episode on May 22, 2019[[note]] This has an explanation: that particular airing, however, was preceded by an airing of "BBRBDAY!", which featured "The Pee-Pee Dance", and was part of a week where episodes featuring {{continuity nod}}s to other episodes would have the episode where the reference came from play after it to hype up the ''Super Hero Summer Camp'' miniseries.[[/note]]. In April 2020, it appeared in a recent "Meanwhile, on Cartoon Network..." promo and then re-entered regular rotation on August 21, 2020.
** While there is a little bit of justification for "Serious Business", there are two other episodes that rarely have reruns for completely unknown reasons: "Gorilla" and "The Mask", the latter of which didn't return until July 2020.

* Unfortunately, most of the animated shorts made during UsefulNotes/TheSilentAgeOfAnimation have become lost films due to many factors, including carelessness with the source materials, the films simply deteriorating due to age, and in some cases, the cartoons being deliberately destroyed. And even for shorts that still exist in some form, even fewer still exist in their original form.

* While UsefulNotes/TheGoldenAgeOfAnimation doesn't have it ''anywhere'' near as bad as the films of the silent era, there's still some problems with it occasionally popping up. The good news is that the bulk of the publicly screened theatrical cartoons of the day still exist in some form, and several companies such as Disney, MGM, Warner Bros. and even the Creator/{{Columbia Cartoon|s}} library have had their libraries restored, with only a handful of flat-out missing episodes (tragically, their handful of Barney Google shorts were deliberately destroyed due to a contractual obligation with King Features--only snippets of silent b&w dupes of one of the films is known to exist). Even the [[Creator/VanBeurenStudios Van Beuren studio]] and Terry Toons have virtually all of their sound films still existing in some way. The bad news is that this is definitely not the case with industrial films and commercials of the era, such as the films of the Jam Handy Studio and the shorts of the army based First Motion Picture Unit. On that note, many of the big studio cartoons have had their original titles removed in reissues, even having new titles spliced into the original negatives--this is the case with many of the WesternAnimation/BettyBoop and WesternAnimation/LooneyTunes shorts (this problem also carries over to Max; many ''Looney Tunes'' cartoons have yet to resurface with their original titles, and there are also a few with their titles ineptly re-created in Photoshop).

** Interestingly, in the context of the show "lost episode" is most often applied to a collection of cutscenes from the UsefulNotes/SegaCD version of ''The Adventures of Batman and Robin'', which boasted storyboards and full voice-acting from the show's cast & crew. While these (totaling about 16 minutes in all) have never been released on home video, they're fairly easy to look up on Youtube.

** The Cool Cat cartoon ''[[WesternAnimation/InjunTrouble1969 Injun Trouble]]'' (the final WB cartoon released during UsefulNotes/TheGoldenAgeOfAnimation; not to be confused with a Porky Pig short from 1938, which is also out of rotation) is omitted from both home video releases and reruns. This is because of the [[ValuesDissonance offensive depictions of Native Americans (which were barely acceptable even during its time)]] as well as [[{{demographically inappropriate humour}} inappropriate humor]] (such as the Topless Saloon).

** Dialogue was recorded for the series finale titled "Bye Bye Beavers", but it was never finished or aired, as per a rule stating that Nickelodeon series finales should not have [[EndOfSeriesAwareness self-referential humor about the series' end]]. (Supposedly, Nick considered breaking the rules for it, but ultimately left it unfinished due to the fact that the episode ended with the Beavers [[AscendToAHigherPlaneOfExistence going to Cartoon Heaven]], which was thought to be too sad for kids.) It was supposed to be paired with an episode called "A Tale of Two Rangers", of which no trace exists.

* While UsefulNotes/TheGoldenAgeOfAnimation doesn't have it ''anywhere'' near as bad as the films of the silent era, there's still some problems with it occasionally popping up. The good news is that the bulk of the publicly screened theatrical cartoons of the day still exist in some form, and several companies such as Disney, MGM, Warner Bros. and even the Creator/{{Columbia Cartoon|s}} library have had their libraries restored, with only a handful of flat-out missing episodes (tragically, their handful of Barney Google shorts were deliberately destroyed due to a contractual obligation with King Features--only snippets of silent b&w dupes of one of the films is known to exist). Even the [[Creator/VanBeurenStudios Van Beuren studio]] and Terry Toons have virtually all of their sound films still existing in some way. The bad news is that this is definitely not the case with industrial films and commercials of the era, such as the films of the Jam Handy Studio and the shorts of the army based First Motion Picture Unit. On that note, many of the big studio cartoons have had their original titles removed in reissues, even having new titles spliced into the original negatives--this is the case with many of the WesternAnimation/BettyBoop and WesternAnimation/LooneyTunes shorts (this problem also carries over to HBO Max; many ''Looney Tunes'' cartoons have yet to resurface with their original titles, and there are also a few with their titles ineptly re-created in Photoshop).

** Season 13's "[[Recap/TheSimpsonsS13E15BlameItOnLisa Blame It on Lisa]]" was banned in Brazil for the same reasons why Japan banned "Thirty Minutes Over Tokyo" (stereotypical depiction of the country).

** As for North America, Boomerang almost never reruns pre-1948 shorts anymore, especially not from TheThirties (with a select few exceptions, like "Little Red Riding Rabbit"). They almost never rerun the post-1964 shorts either (when they paired Daffy Duck with Speedy Gonzales) except for a couple of the Larriva Eleven cartoons [[OldShame due to their negative reception]]. Since Turner itself owns the pre-1948 shorts, the causes of this are unknown.

** The two-part Season 2 finale, "The Hunger Strike" and "The Uncle Ruckus Reality Show", which openly and viciously lampooned Creator/{{BET}}, were removed due to legal threats from BET and its parent company Creator/{{Viacom}}. The episodes finally aired on May 29, 2020 as part of a ''Boondocks'' marathon and it's currently on Creator/HBOMax.

* The animated ''WesternAnimation/PunkyBrewster'', as included in the live-action series DVD sets, leaves out "The Shoe Must Go On", due to music licensing for use of "Axel Foley's Theme" from the ''Film/BeverlyHillsCop'' movies. As of this entry, the episode is ''nowhere'' to be found on the internet.

** Much like ''Looney Tunes'', ''Tom and Jerry'' have shorts that are missing from regular rotation do to ethnic stereotypes [[ValuesDIssonance that have become dated and racist]] such as "The Lonesome Mouse"[[note]]There is a short gag where Jerry gives Tom Hitler-like eyebrows and mustache and spits on it[[/note]], "Mouse Cleaning" (also omitted from DVD)[[note]]Blackface gag with Stepin Fetchit's voice that is extremely hard to edit[[/note]], "Casanova Cat" (omitted from DVD as well)[[note]] also due to lengthy blackface gag extremely hard to edit, plus with the short being even rarer to air than "Mouse Cleaning"[[/note]] "His Mouse Friday"[[note]] story revolves around Tom and Jerry being persued by African savages. Even the edited version is hardly shown[[/note]], and "Two Little Indians"[[note]] Native American stereotyping, this short still comes on but it is very rare[[/note]]. However, there are some shorts that are omitted for completely different reasons such as "Blue Cat Blues"[[note]] Dark references to suicide and alcoholism, worse than "Downhearted Duckling" or "Part Time Pal" respectively[[/note]] and "The Mouse from H.U.N.G.E.R"[[note]]Flickering that can cause epilitical seizures though it is not necessarily omitted it is just rarely seen[[/note]].
** To extension, as of 2011, any short featuring Mammy-Two Shoes(aside from Part-Time Pal briefly) has rarely been seen on Creator/CartoonNetwork or {{Creator/Boomerang}} due to ValuesDissonance. These shorts are also missing from Boomerang SVOD.

* Qubo left 7 episodes of ''[[WesternAnimation/VeggieTales [=VeggieTales=] on TV]]'' intended for the 2008 season unaired. Only one of them, "Gideon: Tuba Warrior", actually aired on qubo before being shelved again in favor of the previous 19 episodes. The 7 aformentioned episodes would eventually air on Cozi TV and syndication networks in 2015.

* ''WesternAnimation/TheXs'' was [[ScrewedByTheNetwork shooed off the air so fast]] that its final episode ("Theater of War"/"Breaking Camp") never aired on either Creator/{{Nickelodeon}} ''or'' Creator/{{Nicktoons}}. [[ShortRunInPeru However, it did air on international feeds]].