->'''Seth Green:''' How about letting us come aboard and help you with your whip-smart plots?\\
'''Ron Moore:''' Help? Why would I need help writing plots? I just throw a dart at the cast list, and...boom! [[Series/BattlestarGalacticaReimagined They're a Cylon!]] Rinse, repeat, cash the f*cking check. Watch! Sh'boom! Sh'bong! Sh'bing! Cylon. Please help me! This is so hard!
-->-- ''WesternAnimation/RobotChicken''

This trope refers to creating a fictional subcategory that can be applied to any character and then applying it ad nauseam to most of the cast. Possibly as a method to create a MetaOrigin (it usually fails).

See also: FlockOfWolves. Contrast TheyLookLikeUsNow.

'''Obviously, beware of spoilers!'''

[[AC:{{Anime}} and {{Manga}}]]
* ''MahouSenseiNegima'' is a bit guilty of this. Although most of the cast was considered normal at the start of the series (excluding Sayo the ghost and Chachamaru the robot,) since then it has been revealed that [[spoiler: Yuuna, Misora, Konoka, Hakase, Takamichi, Chao, and the Headmaster]] were all involved in magic from the beginning, and [[spoiler: Evangeline, Mana, Zazie, and Setsuna]] are demonic. Asuna is practically her own category.

* Lampshaded in the ''GreatLakesAvengers'', where the team renamed themselves The Great Lakes ComicBook/{{X-Men}} after it was revealed that the entire team was made up of mutants.
** This was also a parody of the then popularity of various "X-Titles".
** It's a justified trope in the Marvelverse, mind; all the other origins are one-in-a-billion freak occurences, or inventions by 99.999999th-percentile geniuses [[ReedRichardsIsUseless who for some reason keep their potentially world-changing inventions to themselves]]. Mutants are a ''demographic.''
* In ''StrangersInParadise'', just about every [[spoiler: female]] character [[spoiler: turns out to be a current or former Parker Girl]].

* About two thirds into ''Film/{{Identity}}'', it's revealed that [[spoiler: every single character at the motel is a personality of Malcolm Rivers, and the whole movie was a plot to kill off his alternate identities, curing his Multiple Personality Disorder.]]
* Creator/JohnCarpenter's ''The Ward'' uses a similar premise to ''Identity''.

* OlderThanRadio: ''Literature/TheManWhoWasThursday'' (1908) by G.K. Chesterton: The hero, who is an undercover policeman is drawn into the murky world of anarchists. He discovers that one of their number is also an undercover policeman. As the story continues, his attempts to apprehend anarchists force all of them to reveal that they are policemen, too.
* The Literature/{{Discworld}} novel ''Discworld/MonstrousRegiment'' is about a SweetPollyOliver going off to war. Gradually over the course of the story, [[spoiler:she discovers that more and more of her comrades are also women, some in more convincing disguises than others. All of them, in fact, including the troll. Even the bluff old SergeantRock, who also happens to be aware that a good third of the high command are women in disguise, along with Nuggan-knows how many of the troops. The country has been at war for so long that all the men have simply been killed off.]]

* The second ''Series/{{Battlestar Galactica|Reimagined}}'' made nearly half the cast Cylons. Although there was plenty of evidence to suggest that [[spoiler: Tyrol]] was one, and even that [[spoiler:Tigh OR Ellen was one which necessitates the other]]. Not to mention precedent of sleeper agents.
* ''Series/{{Heroes}}'' often had characters revealed to have powers.
* ''Series/BuffyTheVampireSlayer'': At the start of the show, only Buffy was anything other than a normal human, but by the end, several supernatural beings had joined their group, and almost everyone else had learned how to practice magic.
* ''Series/{{Dollhouse}}'': [[spoiler:Lubov]] is a doll! [[spoiler:Mellie]] is a doll! [[spoiler:Saunders]] is a doll! Season 2 brings even more.
* ''Series/TrueBlood'': The folks with powers will soon outnumber the normal people in Bon Temps.
* ''Series/{{V 2009}}'': Seems like every third character is secretly a V sleeper. [[spoiler: ''Two'' of Erica's FBI partners were Visitors--not to mention her obstetrician.]]

* From ''VideoGame/KingdomHeartsII'' onwards, almost every single mysterious character manages to be [[spoiler: a form of Sora]], no matter how illogical or unlikely it seems. The only ones who aren't are the ones who actually turn out to be [[spoiler: a form of Xehanort.]]

* In ''Webcomic/ItsWalky'', several cast members are revealed to be former abductees.