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Putting "Zero" in the title of a work, or episode of that work, can be a good shorthand that a work is a {{prequel}}, prologue, or even a remake of a first chapter. Some comic book origin stories are shown in issues numbered 0.

Subtrope of NumberedSequels. Compare {{Title 1}}. See also UnusualChapterNumbers, YearZero.

'''Note:''' If "Zero" is in the title for any other reason, it doesn't count (as it wouldn't be the beginning). So works like ''VideoGame/MegaManZero'' and ''VideoGame/PhantasyStarZero'' wouldn't be an example. Also, the names have to be official, not {{fan nickname}}s.

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!Examples:

[[foldercontrol]]

[[folder:Anime and Manga]]
* ''Aika Zero'', a prequel to ''Anime/AgentAika''.
* ''Anime/GaReiZero''
* The ''LightNovel/HaruhiSuzumiya'' episode "The Adventures of Mikuru Asahina Episode 00" (though that's more of a subversion, since the episode mainly comprises the SOS Brigade's school movie that's produced in the middle of the series, and will be ''completely'' incomprehensible to anyone who isn't familiar with the show - and not much more comprehensible to those who are).
* ''Franchise/LyricalNanoha''
** In ''Anime/MagicalGirlLyricalNanoha [[TheMovie Movie]] First [[ComicBookAdaptation The Comics]]'', the chapters depicting events that [[AlternateContinuity may have]] occurred before the movie itself were called Sequence 0-X, where X is the chapters of Sequence 0.
** ''Manga/MagicalRecordLyricalNanohaForce'' had Chapter 0, which served as a short prologue for the manga.
** ''Manga/MagicalGirlLyricalNanohaINNOCENT'' started with [[IdiosyncraticEpisodeNaming Duel 00]], which served as an introduction to this AlternateUniverse of ''Nanoha'' and the "Brave Duel" card game that this SpinOff will revolve around.
* ''MacrossZero''
* ''Anime/MobileSuitGundamWing: Episode Zero''.
* ''OnePiece'': Chapter 0 serves as the backstory for many pivotal events, such as the old rival Shiki and his role in the canonical film "Strong World".
* ''QueensBlade Rebellion Zero'', a manga, althrough technically an interquel between the events of the QB's [=OVAs=] and the gamebooks' continuity version of ''Rebellion.''
* ''[[http://en.wikipedia.org/wiki/Rose_Hip_Zero Rose Hip Zero]]'' is a prequel to ''[[http://en.wikipedia.org/wiki/Rose_Hip_Rose Rose Hip Rose]]''.
* ''[[http://en.wikipedia.org/wiki/SD_Gundam_Force_Emaki_Musharetsuden_Zero SD Gundam Force Emaki Musharetsuden Zero]]'' was a prequel to ''[[http://en.wikipedia.org/wiki/SD_Gundam_Force_Emaki_Musharetsuden SD Gundam Force Emaki Musharetsuden]]''.
* ''SteelAngelKurumi 0'', a prequel to the ''SteelAngelKurumi'' series.
* The film ''Un-Go: Episode 0'', prequel to ''UnGo''.
[[/folder]]

[[folder:Comicbooks]]
* "Zero Month" following DCComics' ''ZeroHour'' is a borderline case; the #0s all retell the heroes' origins, but in FlashBack, with a FramingStory in the present.
** There was another "Zero Month" for the one-year anniversary of the {{New 52}} reboot.
*** Before the New 52, there was an Issue #0 of ''ComicBook/{{Batwoman}}'', which consists of Batman observing the heroine to get confirmation on her identity, eventually deeming her a worthy candidate for Batman Inc. It is included in the collected edition of the comic's first storyline. Funnily enough, this means that Batwoman has two Issue #0s in this continuity.
*** Averted with in ''ComicBook/GreenLantern'' #0 and ''Green Lantern: The New Guardians'' #0; featuring new present-day origins (of Earth's newest Green Lantern and an overhauled ''New Guardians'' roster) instead of flashbacks.
** The New 52 version of Bruce Wayne first taking on the Batman identity is titled ''Comicbook/BatmanZeroYear''.
* "Chapter 0: Of Ducks, Dimes, and Destinies", part of ''ComicBook/TheLifeAndTimesOfScroogeMcDuck''. Made after the series concluded, but given the "Chapter 0" moniker because it was a retelling of the first chapter detailing Magica de Spell's involvement during her time travel.
* MarvelComics had a "Flashback Month" in which every comic published an #-1, set ''before'' the origin stories.
** More specifically, in most cases they were set before ''ComicBook/FantasticFour #1'', which started the Silver Age of Marvel.* ComicBook/{{Spider-Girl}}'s first issue was numbered 0, and was a reprint of ''ComicBook/WhatIf'' v2 #105, the issue she first appeared in.
* ''ComicBook/NinjaHighSchool'' received a Chapter 0, many years after it first began. It was an {{Interquel}} for Ichi-kun (after her grandfather defeated her in Chapter 1, but before her trip to America) and Asrial (after she was made aware of who she was being sent to marry, but before being transformed into a human form), but a {{Prequel}} for Jeremy (showing him the day before his introduction in Chapter 1).
* RobertCrumb's ''Zap Comix'' came out with an issue zero: he had lost the art to the first issue and made a new one, then discovered the missing artwork and released it later.
[[/folder]]

[[folder:Film]]
* ''[[Film/{{Carved}} The Slit-Mouthed Woman 0: The Beginning]]''.
* ''Film/CubeZero'' is the third film in the series but is a prequel to the first film.
* ''Anime/IchiTheKiller: Episode Zero'', an animated prequel to the live action film ''Film/IchiTheKiller''.
* ''Anime/LupinIIIEpisode0FirstContact'' is a prequel explaining how the gang all met. [[spoiler: [[UnreliableNarrator Maybe.]]]] Not the only OriginsEpisode in a [[Franchise/LupinIII franchise]] that relies on BroadStrokes continuity, either.
* ''Anime/MaiOtome0Sifr'', a prequel to the other ''MaiOtome'' films.
* ''Film/Ring0Birthday''. A prequel to the Japanese film ''Film/{{Ringu}}''.
* ''Yoshie Zero'', a prequel to ''[[http://en.wikipedia.org/wiki/Mutant_Girls_Squad Mutant Girls Squad]]''. A rare example where the non "zero" part of the title doesn't match the sequel.
[[/folder]]


[[folder:Live-Action TV]]
* ''Series/PrettyGuardianSailorMoon Act Zero'', a prequel to ''Pretty Guardian Sailor Moon''.
[[/folder]]

[[folder:Videogames]]
* ''VideoGame/AceCombatZeroTheBelkanWar'', prequel to ''AceCombat5TheUnsungWar''.
* ''VideoGame/DarkVoid Zero''. Originally starting out as an April Fools joke based off of an 8-bit rendition of ''Dark Void'''s main theme, the game soon became a fully-fledged [[NintendoDS DSiWare]] title claimed to be a "legendary 'lost project'" of Capcom's, recently found locked away in their vaults.
* The DatingSim ''Dream Club Zero'', a prequel to ''Dream Club''.
* ''Final Ninja Zero'' is a prequel to ''Final Ninja''.
* ''Ko-ko-ro...0'' is the third game in the ''Ko-ko-ro...'' H game series to be released, but the events of ''Ko-ko-ro...0'' precede those of ''Ko-ko-ro...'' and ''Ko-ko-ro...II''. Though incest and rape are primary themes in the series as a whole, one of the possible endings of ''Ko-ko-ro...0'' [[spoiler: (namely, the revelation that Kasumi is Souji's mother, not his older sister)]] turns the squick factor of the already quite squicky original game UpToEleven.
* ''VideoGame/MetroidZeroMission'' is a remake of the first ''VideoGame/{{Metroid}}'' game.
* ''Perfect Dark Zero'', a prequel to ''VideoGame/PerfectDark''.
* ''RecordOfAgarestWarZero'', prequel to ''RecordOfAgarestWar''.
* ''VideoGame/ResidentEvil0''
* ''VideoGame/SamuraiShodown V'', a prequel to the original game, was titled ''Samurai Spirits Zero'' in Japan.
* ''VideoGame/SilentHillOrigins'' has the "O" in its subtitle stylized to look like a zero; [[MarketBasedTitle it was retitled]] ''Silent Hill Zero'' in Japan.
* The ''VideoGame/StreetFighterAlpha'' series is titled ''Street Fighter Zero'' in [[MarketBasedTitle Japan]]. While actually set after the original ''VideoGame/StreetFighter'', the plot of the ''Alpha'' series (at least for the first two games) explores the events that led to the ''VideoGame/StreetFighterII'' tournament (namely Chun-Li's pursuit of M. Bison and Charlie's death).
* While "Franchise/{{Ultima}} 0" was originally just a FanNickname for ''Akalabeth'', the title was [[AscendedMeme made official]] when it was included in the ''Ultima Collection'' compilation box.
* ''VideoGame/{{Zork}} Zero: The Revenge of Megaboz''. The ninth and final Zork game released and a prequel to the original.
[[/folder]]

[[folder:Web Animation]]
* ''[[Series/TwentyFour 24]]: Day Zero''. A series of animated webisodes. It's a prequel series, focusing on Jack Bauer's first 18 months at CTU.
[[/folder]]

[[folder:Webcomics]]
* ''FreemansMind'' released an Episode 0 between 34 and 35, showing Gordon going through the hazard course [[spoiler: and refusing to finish after being told to jump two stories onto concrete]].
* ''On the Origin of [=PCs=]'', the first ''Webcomic/TheOrderOfTheStick'' prequel, was published as issue number 0. ''Start of Darkness'', the second prequel, takes place even earlier, so it's issue number -1.
* ''{{xkcd}}'''s print edition starts with volume 0. It's not a prequel, the author just likes zero-indexing.
[[/folder]]

[[folder:Western Animation]]
* ''WesternAnimation/CodenameKidsNextDoor'' [[TheMovie the Movie]], ''WesternAnimation/OperationZERO'', begins with showing the events behind the foundation of Kids Next Door.
[[/folder]]

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