Everything can be changed! Done for a variety of reasons, ranging from poor {{ratings}} to [[RealLifeWritesThePlot someone leaving the show]] to [[ExecutiveMeddling network fiat]], but basically means everything (premise, casting, setting, tone, writing, general emphasis) can be "tweaked" to take the show in a different direction. Not everything changes; some retools are subtle, some not so much. Drastic retooling runs the risk of alienating the current viewership ("[[TheyChangedItNowItSucks change is bad!]]"), if any.

Many examples of retooling come between a show's pilot and the episodes made after the series is picked up. Others happen when a show isn't really getting off the ground or is in decline and the creators want to shake things up. When done out of nowhere in the middle of the show, then you've got yourself a WhamEpisode. A retool may also be the result of a PostScriptSeason; the series ends up going in a strange new direction because all the prior conflicts were already resolved, and new ones need to be invented.

In many cases a retool is needed because as it existed previously, there might have been very little room for [[CharacterDevelopment characters to grow]] or that the established rules hindered creative stories. In some cases, when the retool is so ''drastically'' different, you are asked to accept what came before in BroadStrokes. Quite frequently, a retool will include one (or more) {{Tone Shift}}s.

The most extreme form of retool is the ContinuityReboot.

See also: {{Retcon}}, {{Revision}}, {{Rewrite}}.

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!!Examples:

[[index]]
Retool/LiveActionTelevision has its own page due to the sheer number of examples.
[[/index]]

[[foldercontrol]]

[[folder: Anime and Manga ]]
* ''Anime/{{Pokemon}}'' began doing this after the Johto saga, when Ash would leave most of the Pokémon he carried with him at Professor Oak's and travel to the new region with just Pikachu. This is meant to create room on his team for Pokémon from the latest generation of games.
** They did it once more for ''Best Wishes'' by having Ash catch more than six Pokémon at a time and putting them into rotation.
** In addition, they made Team Rocket far more threatening than in previous sagas where they were everyone's {{Butt Monkey}}s
* After five years of success, ''DragonBall'' was completely retooled in the late '80s: The series became much more focused on fighting 24/7, several of the past characters had their roles reduced or were outright dropped, the series gave bigger spotlights to some of the current supporting characters while often shifting Goku to the background at times, and added a much more sci-fi feeling by revealing Goku was an alien. It's not surprising that these changes in the manga were what lead to the anime being renamed ''DragonBallZ''
** Done subtle before that with the TimeSkip in the Piccolo Junior Saga. Everyone has a growth spurt or new look. Also the main characters make prominent use of Chi attacks during the World Martial Arts Tournament, while before only they were mostly last resort trump cards.
* The original IGPX miniseries was a mecha combat tournament. The actual series is a racing anime.
* The original anime adaptation of ''Manga/RanmaOneHalf'' originally lasted for eighteen episodes and aired on Fuji TV, but was canceled due to low ratings. The show's crew regrouped, gave the show a retool (most notably, the boys in Ranma's school now are completely oblivious to his transformation into a girl, whereas in the manga, they were fully aware) and relaunched it one month later as ''Ranma 1/2: Netto-hen", which proceeded to last for 143 episodes, two movies and a number of OVAs.
* ''Anime/HappinessChargePrettyCure'' is essentially a major retooling of the franchise in that it tossed away so many tropes connected to the previous series, it isn't funny. The main character is the blue-themed girl instead of the pink-themed leader, the yellow-themed girl's a TechnicalPacifist, the purple-themed girl is a JerkAss who gets taken down a few pegs, TheMentor's a {{Bishounen}}.
[[/folder]]

[[folder: Comic Books ]]
* The ''{{Asterix}}'' album ''Astérix and the Falling Sky'' completely shifted the focus, theme and and tone of the series, transforming a historical comedy into a science fiction pop culture reference smorgasbord.
* MarvelUniverse heroine ComicBook/PatsyWalker has gone through numerous [=retools=]. Started out as an Archie-style teen comedy, moved over into more straight romance, became a superheroine named Hellcat, became DarkerAndEdgier, and now is... Just weird. And [[RuleOfCool Awesome]]. Note that all of that stuff is still technically in-continuity.
* By 1970, ''Comicbook/{{X-Men}}'' was an unpopular series that was reduced to reprinting old material. 5 years later, after getting a [[LenWein new writer]], putting most of the old team [[PutOnABus on a bus]] (temporarily) in favor of other [[{{Wolverine}} characters]], and dedicating as much time to CharacterDevelopment as fights, the series picked up a great many new fans.
* The MarvelComics series ''Comicbook/{{Thunderbolts}}'' has always fundamentally had the same premise (a super hero team (that term used loosely) comprised of villains). However, the exact nature of the team has been changed several times, amazingly with the series lasting over 150+ issues only once being canceled and relaunched once.
** Originally, ''Comicbook/{{Thunderbolts}}'' centered around a team of heroes that were actually Baron Zemo's Masters of Evil in disguise working to gain the public's trust so they could easily overtake them.
** Eventually, the team (those that decided to reform and be actual heroes) came under the leadership of Comicbook/{{Hawkeye}} up until a short period where all the previous story lines were abandoned and the book was made into a super hero fight club. Shortly after that it was cancelled.
** It was brought back soon after around the time of Comicbook/NewAvengers' release with a cast featuring some new characters as well as old ones until the Marvel crossover event ''ComicBook/CivilWar''.
** During and after ''Civil War'' the team consisted of more popular villains like [[Comicbook/NormanOsborn Green Goblin]], Comicbook/{{Venom}}, and [[Comicbook/{{Daredevil}} Bullseye]] working as "hero hunters" for the pro-registration side to capture anti-registration superheroes.
** During ''ComicBook/DarkReign'' most of the hero hunter team became the Comicbook/DarkAvengers and the Thunderbolts became Norman Osborn's personal hit squad.
** After ''Dark Reign'' and at the onset of Marvel's ''ComicBook/HeroicAge'' the Thunderbolts became super villain prison The Raft's rehabilitation program for super criminals (this time including Comicbook/ManThing, Juggernaut, and Ghost among others), under the supervision of {{Luke Cage|HeroForHire}}.
** With #175, the title got [[MarketBasedTitle renamed]] to DarkAvengers with characters from the second incarnation of the Dark Avengers joining the cast, still under the leadership of Luke Cage.
** ''MarvelNow'': the Raft program got shut down, RedHulk took the Thunderbolts name for his black ops squad of antiheroes, and the Dark Avengers found themselves independent once again.
* ''TheDefenders'' went through this several times:
** It started off as a book with a fluid, non-committal roster usually anchored by Comicbook/TheIncredibleHulk, DoctorStrange, {{Namor}}, and the SilverSurfer. At issue #125, the title was renamed ''The New Defenders'' and the roster was changed to a more official, government-sanctioned team consisting of Beast, Angel, Iceman, Gargoyle, Valkyrie, and Moondragon. Writer J.M. [=DeMatteis=] quickly left the title after realizing he'd sacrificed the book's more quirky, offbeat tone in favor of making it into another run of the mill ''[[Comicbook/TheAvengers Avengers]]'' clone.
** The title was revived in the 90's as ''The Secret Defenders'', which featured a revolving door HeroesUnlimited cast.
** In 2013 it was relaunched as ''Fearless Defenders'', an [[AmazonBrigade all-female]] team anchored by Valkyrie and Misty Knight.
* In the pages of ''ComicBook/{{Superman}}'' during 1971, an experimental "Kryptonite-Engine" made to provide cheap electrical power malfunctions, causing all the Kryptonite on the planet to become ordinary iron. Meanwhile, Clark Kent became a TV news reporter while an EvilTwin of Superman made of sand drained him of some of his powers. [[http://superman.nu/tales4/sand/1/?page=-1 You can read the full saga here.]] After the entire story is resolved, the series's new direction was quickly lost and more Kryptonite arrives from space, the only holdover from the storyline (until ''CrisisOnInfiniteEarths'') being that Clark works at a television news station.
* By 1968, the MetalMen were among the DenserAndWackier of DCComics' output. That all changed in Metal Men #33, which began a StoryArc where the team could not control their increased powers and find themselves hunted by humans, who turned against them. It came to a head in #37, where the Metal Men were finally apprehended and left for dead in a junkyard. Mister Conan salvaged them and [[TheyLookLikeUsNow gave them human identities]] so they could continue to help the world in secret.
* In the wake of [[spoiler: Johnny Storm's death]] the ComicBook/FantasticFour has undergone a (probably) temporary change with them becoming the Future Foundation. This has involved them donning black and white uniforms, adding {{Spider-Man}} to the team [[spoiler: to replace Johnny]], bringing [[spoiler: DoctorDoom and Mister Fantastic's time traveling father]] along for the ride and becoming a sort of superhero think tank. Thus far the new series has been well received.
** In the late-1980s, Steve Engelhart tried to spruce things up with the 'NEW' Fantastic Four, with Reed and Sue PutOnABus and replaced with Crystal and the second ComicBook/MsMarvel.
* DC's September 2011 relaunch stands with one foot in the ContinuityReboot camp and another in the retool camp. Some characters are getting retold origins and backstories (Superman is getting his early days retold, with him now being the first superhero in the DCU) while others are simply getting a change to the status quo (Bruce Wayne is now the only Franchise/{{Batman}}, with Dick Grayson going back to {{Nightwing}} and Damian remaining as Robin).
* ''Comicbook/{{X-Factor}}'' started off as a reunion book featuring the original five SilverAge Comicbook/XMen, and in the In the 90's, was [=retooled=] into a government-sanctioned team of mutant superheroes lead by Havok. Peter David later relaunched the title again in 2005 as a [[FilmNoir Noir]] detective title consisting of a bunch of former {{X-Force}} and GenerationX members. It was {{ReTool}}ed ''again'' in 2014 as part of the [[MarvelNOW Marvel NOW!]] event, with the book now focusing on a team of {{Corporate Sponsored Superhero}}es.
* ''Titans'' was originally a superhero book about the now-adult former members of the [[Comicbook/TeenTitans New Teen Titans]]. During ''BrightestDay'', the concept was completely revamped, and the book ended up becoming about a team of AntiHero mercenaries lead by Comicbook/{{Deathstroke}}.
* ''ComicBook/KatyKeene'' had two revivals, each retooling the story their own ways.
* Comicbook/ThePunisher spent better part of the late eighties and the first half of the nineties by killing every kind of criminal on the planet. After he was brainwashed and supposedly killed Nick Fury in ''Over the Edge'' event, he was sent to the electric chair at the start of his new series, only to be revealed that his death was faked by [[NeighborhoodFriendlyGangsters the Geraci family]], who made Castle their new [[TheDon don]]. He still continued fighting criminals, but now at his "family's" interest.
** This was followed by [[Comicbook/ThePunisherPurgatory another retool]], where Castle became an EmpoweredBadassNormal with weapons from Heaven.
* ''Comicbook/{{Tomahawk}}'' had two retools towards the end of its run. First, the comic was changed from "hey kids isn't Davy Crockett cool?" to "the Howling Commandos in the Revolutionary War", with Tomahawk gaining a [[RagtagBunchOfMisfits colorful supporting cast]] and a direct affiliation with the Continental Army. After about five years of that, the book (retaining the same title and numbering) jumped forward some 40 years and focused on Tomahawk's son Hawk, with the still-living Tomahawk being Hawk's mentor/sidekick. "Hawk, son of Tomahawk" didn't last too long, as the book was canceled within a year of Hawk's introduction.
* ''ComicBook/MortadeloYFilemon'': Mortadelo and Filemón originally had a private detective agency and were a parody of SherlockHolmes and Watson (the comic's original title was "Mortadelo y Filemón - Agencia de Información"), not the ''Film/JamesBond'' parody they eventually became. [[TheArtifact As a relic of that time]], Mortadelo still calls Filemón "Boss", despite they don't seem to have much different responsabilities in the T.I.A.
* GreenArrow started off as a campy {{Batman}} [[{{Expy}} wannabe]], but during the 1970's he was reimagined as a more liberal, street-level hero with a social justice slant. He began crusading against societal injustices and became an advocate for victims of oppression, often with a decreased focus on the bigger, more bombastic threats threats he used to face in the pages of ''JusticeLeagueOfAmerica''.
** The {{New 52}} ''Green Arrow'' volume underwent one as well. The first year or so of the title brought the character back to his Batman-ish roots and had an increased emphasis on the CrimeFightingWithCash aspect. After this move was widely panned, Jeff Lemire took over the title at issue #17 and removed all of the corporate and high-tech trappings in favor of a DarkerAndEdgier street level feel.
* Thanks to a heaping dose of ScrewedByTheLawyers, ''ComicBook/ArchieComicsSonicTheHedgehog'' underwent a major retooling, returning the series to its game roots and jettisoning 20 years of KudzuPlot, RomanticPlotTumor and many other problems.
[[/folder]]

[[folder:Fan Fic]]
* InUniverse in ''Fanfic/TheCalvinHobbesAndPaineShow'': the titular ShowWithinAShow starts out identical to [[ComicStrip/CalvinAndHobbes the original strip]], but after Watterson leaves gets turned into a VarietyShow and adopts [[CousinOliver Paine]]. Calvin (the actor, that is) [[JumpedTheShark isn't very fond of the changes.]]
[[/folder]]

[[folder: Film]]
* The ''Franchise/StarTrek'' franchise features several notable film examples:
** ''Film/StarTrekIITheWrathOfKhan'' retooled the franchise after the mediocre results of the first movie, by bringing back a classic villain and retooling Starfleet as more naval-oriented than it was portrayed in the original series.
*** The 2009 ''Film/StarTrek'' retooled ''the entire franchise'' after the dismal box office results of ''Film/StarTrekNemesis''. The focus was changed to a [[AlternateContinuity different timeline]] following the (now changed because of [[spoiler:Romulan influence]]) adventures of the crew from the original series.
** ''Film/StarTrekFirstContact'' radically redesigned the Borg in many ways. The most obvious one is cosmetic, they looked like they were being rotted out from the inside whereas their prior makeup was pale guys in armored suits. They then established the idea of the [[HiveQueen Borg Queen]] because without a leader they are really just slightly more difficult zombies. Then it showed that they assimilate ''people'' en mass as well as technology, whereas in the TNG "Best Of Both Worlds" it was suggested that Picard was a one time deal. And lastly, partially because of the existence of the Queen, they are shown to have a much greater sense of tactics and strategy to even attempt the TimeTravel plot, before they were just overconfident in their malevolence. But there is a reason ''First Contact'' is considered the best ''TNG'' movie.
* The ''Franchise/{{Rocky}}'' series was retooled in [[RockyIII the third movie]] to be more action-oriented and contain less drama. [[Film/RockyV The fifth film]] went back to its roots. [[RockyBalboa The sixth film]] made over a decade later went for drama of a more realistic sort.
* After ''Film/BatmanReturns'' came under fire from parents, watchdog groups, and merchandise-tie-in companies such as [=Mc=]Donald's for being considerably darker, more violent, sexual and disturbing than its 1989 predecessor (as well as not even getting remotely close to equaling its box office intake), director Creator/TimBurton as well as star MichaelKeaton and composer DannyElfman left the series. In their place for the LighterAndSofter (as well as brighter) third movie, ''Film/BatmanForever'' came JoelSchumacher, ValKilmer and Elliot Goldenthal respectively.
** And after this direction proved disastrous in the follow-up film, ''Film/BatmanAndRobin'', the series lay dormant for eight years until a ContinuityReboot retooled the series again, putting as much distance as possible between the Batman franchise and the embarrassment that JoelSchumacher had turned it into, resulting in ''Creator/ChristopherNolan'''s darker, more realistic, and more grounded ''Film/BatmanBegins'', which became the first of a trilogy, ''Film/TheDarkKnightSaga'', that is praised as a return to form for the series.
* Starting with the third movie, the ''PlanetOfTheApes'' franchise switched from following human characters in the far future to ape characters in the present or immediate future. Burton's remake attempted to return to the astronaut protagonist, but after its poor reception, the series went back to ape protagonists with the ''Film/RiseOfThePlanetOfTheApes'' {{reboot}}.
* After ''GIJoeTheRiseOfCobra'' scored at the box office but received harsh reviews from fans and critics, the studio wanted to do a full-on ContinuityReboot. They settled for a sequel, ''GIJoeRetaliation'' which had a DarkerAndEdgier tone and a mostly-new cast of characters. Most of the original cast had [[DroppedABridgeOnHim A Bridge Dropped On Them]] off-screen, Baroness was {{Brother Chuck}}'d, and Duke [[spoiler: [[SuddenSequelDeathSyndrome was killed off]] so that focus could shift to Roadblock (played by DwayneJohnson)]].
[[/folder]]

[[folder:Magazines]]
* After nearly four decades as a knockoff of ''Magazine/{{Mad}}'', ''Magazine/{{Cracked}}'' morphed into a "lad mag" akin to ''FHM'' or ''Maxim''. This retool was short-lived and the magazine died soon afterward, only to be revived online as [[Website/{{Cracked}} the list-heavy humor site]] it is now.
* The British magazine ''heat'' launched as an entertainment-focused, hipper alternative to the {{RadioTimes}}. Although this was well-received, it didn't do well commercially. A series of quick makeovers saw it repositioned as a more downmarket, gossip and soap/reality-celebrity focused publication aimed mainly at women, and it's now one of the UK's biggest-selling magazines.
[[/folder]]

[[folder: Multiple Media ]]
* ''Franchise/{{Bionicle}}'':
** Franchise/{{LEGO}} attempted this in '09, with the Bara Magna saga. The story was moved to a new planet with completely new characters belonging to entirely new races. The line lost many of its signature traces, such as [[MaskOfPower Kanohi Masks]] and elemental-powers (although the ElementalNation-setting stayed), the new characters were mostly organic as opposed to mostly robotic, and due to LEGO's newer violence policies, the fights became actually gory. Yet, the retool failed: not only did all these new ideas come too suddenly, the story got tied back to the original within half a year, with the introduction of Mata Nui (the former BigGood) as the new [[TheHero protagonist]]. Now, the basic idea ''was'' to have him back as the focus of the rest of the new story, until the GrandFinale which would bring both the old and new stories to a close some years later. But Mata Nui brought with him way too much continuity way too early, which alienated new fans. Meanwhile, all the {{Retcon}}s and [[DoingInTheWizard needless explanations]] brought about upset some old fans. The line was canceled in 2010 with a very haphazard ending, although LEGO was reluctant to let it last beyond 2009.
** The original Kanohi Masks were designed to be the collectable aspects of the toys, and in the story they could be merged to form a "Golden Kanohi" which held the powers of all the ones collected before. After the Mata Nui Saga ended, the collectable aspect faded away from Kanohi into whatever was the current macguffin of the story, eventually doing away with the "collectable" part entirely, replacing them with ammunition packs for the weapons the toys carried.
** Each generation of Toys usually had a built-in "action" feature, beginning with the Toa Mata/Nuva's arm-swinging gimmick. These usually required a simple gear system set up and all sets in some form had a "action" feature built into them. After the Visorak saga, these were instead dropped in exchange for more posability in the sets, in turn resulting in many of the future sets following a certain "formula" (coined the "Inika" due to the Toa Inikas first using it) for builds, with whatever function being relegated into their weapons instead. While some sets got a bit creative (most notably the Barraki sets), the repetitiveness eventually caused fatique in buyers, as at that point the only interesting things about a new set was maybe one or two armor pieces and the mask/helmet.
[[/folder]]

[[folder: Newspaper Comics ]]
* ''{{Blondie}}'' was originally about a flapper and her rich boyfriends. When she married one of them, Dagwood Bumstead, he was disinherited, had to get a job, and lived a life more of the audience could identify with. On top of that, said husband essentially [[BreakoutCharacter became the main character]].
* Barney Google moved to a place full of hillbillies, then was [[ChuckCunninghamSyndrome written out]] in favor of BreakoutCharacter Snuffy Smith.
* BeetleBailey started out as a strip about a ne'er-do-well college student. Then, very early in the series' run, the main character joined the army, where he has been for the last sixty-three years.
* When Garry Trudeau returned from his 18-month sabbatical, the main characters of ''{{Doonesbury}}'' left college (and the town the college was in) behind, got careers & families, and started aging in real-time. This caused a noticeable shift in the perspective of the strip (although its political nature never changed).
** Although at the very beginning, the cartoon wasn't really oriented towards covering politics at all, being about the college life of its main cast and making this a double example.
[[/folder]]

[[folder: Web Original]]
* Chris Bores of ''WebVideo/TheIrateGamer'' had another review show called ''The Breakfast Rant'', but it was eventually retooled into ''I Rate the 80's'' in order to broaden its scope.
* After being {{Uncancelled}}, WebVideo/TheNostalgiaCritic changed up the format of the series: First and foremost, his movie reviews now cover any film as long as it is not in theaters. Reviews are now bi-weekly, with every other week devoted to short editorials. Also, two of Creator/DougWalker's cast members from his series ''WebVideo/DemoReel'', Rachel Tietz and Malcolm Ray, joined the cast as regular members (although Rachel has since left to pursue other career opportunites and was replaced by her old roommate, Tamara Chambers).
[[/folder]]

[[folder: Western Animation ]]
* When ''{{Doug}}'' [[ChannelHop moved from]] {{Nickelodeon}} to Creator/{{ABC}}, many characters and locations were redesigned, and the show was renamed ''Disney's Brand Spanking New Doug''. [[NothingIsTheSameAnymore There were in-show reasons given for most of the changes.]]
** This was also played with in-show, with the Film/JamesBond [[CaptainErsatz Ersatz]] "Smash Adams", who was retooled into a fat and bumbling secret agent.
* ''WesternAnimation/BatmanTheAnimatedSeries'' underwent this for the final season, with the title changed to ''The New Batman Adventures''. Aside from new character designs and a new art style, the show [[AscendedExtra added Batgirl to the main cast]], had Dick Grayson [[SidekickGraduationsStick become Nightwing]], and introduced a [[LegacyCharacter new]] ComicBook/{{Robin}} as his successor. [[TheOtherDarrin New voices]] were also used for a number of characters.
* Spoofed by an ad campaign which aired between seasons of ''WesternAnimation/KingOfTheHill''. The second season ended on a cliffhanger with the local Mega-lo Mart (a Wal-Mart {{expy}}) being destroyed by a propane explosion. Four characters, including protagonist Hank, were inside at the time, and FOX told viewers that one of them would die. Ads that aired throughout the summer showed viewers a "behind the scenes" disagreement between Hank and FOX, which threatened to kill him off unless he agreed to allow the show to be re-tooled by moving it to Los Angeles and retitling it "King of the Hollywood Hills." Hank refused, and eventually got his way thanks to Bobby accidentally getting a hold of some compromising photos of a FOX executive. Of course, in reality, there was no such dispute and the writers had always known from the start who they were going to kill off [[spoiler:(Luanne's boyfriend, Buckley)]].
* Spoofed on ''TheSimpsons'' episode "Homer to the Max" (1999). Watching the first episode of ''Police Cops'', Homer is thrilled to discover he shares his name with its Don Johnson-like lead character (catchphrase: "And that's the end of that chapter!"); the next week Homer is horrified to see his character retooled as a blundering doofus (catchphrase: "Uh-oh, Spaghetti-Os!"). He seeks out the show's producers and writers.
--->'''Homer''': Uh ... so, I just wanna know how come you made your Homer Simpson character so ...\\
'''Producer''': Stupid? [laughs] Well, I can assure you, it happened organically.\\
'''Homer''': It ''better'' have!
** Another episode featured a Franchise/{{Robocop}} {{Expy}}. Homer wanted to watch it before it got retooled. A couple of seconds later the robot (who is also a Father) quit the force and got a job at a fashion agency.
** Yet another episode showed that the Krusty the Klown Show used to be a [[http://www.youtube.com/watch?v=bd8vNJoVwf8 serious socio-political talk show]] during TheSixties.
** ''TheSimpsons'' themselves went from having Bart as de facto main character early on to Homer, who became [[{{Flanderization}} more and more stupid]] with each season.
* The '80s-'90s cartoon version of ''WesternAnimation/{{Teenage Mutant Ninja Turtles|1987}}'' was retooled for its eighth season, going through significant changes in audiovisual style and tone. The episodes after the retool are commonly known in the fandom as the "Red Sky Episodes", since this was the hue the backgrounds almost invariably took. The story itself became darker, with the Shredder going from AffablyEvil to total BigBad and more threatening than ever, and the Turtles becoming wanted by the NYPD for [[spoiler:failing to stop Shredder from blowing up the Channel 6 skyscraper]].
** In the ninth season, the series received more changes. Shredder and Krang were PutOnABus and replaced by Lord Dregg, who would became the main villain for the rest of the series. The Turtles also got a new sidekick named Carter, and there was also a new subplot involving the mutagen, that turned them the way they are at the very beginning, going wrong, turning them into large mutant monsters.
* Like its predecessor, the second ''WesternAnimation/{{Teenage Mutant Ninja Turtles|2003}}'' animated series was eventually retooled. During its sixth season, its setting was changed from the present day to the year 2105 via accidental time travel. "Fast Forward", as the season was subtitled, featured a shift in art style (simpler) and in tone (lighter), the abandoning of most of the show's supporting cast in favor of completely new ones. A second, milder retool occurred with the seventh season, which featured the turtles' return to present day, yet another ArtShift, and a new subtitle--"Back to the Sewer".
* About halfway into its second season, ''TheAvengersEarthsMightiestHeroes'' got retooled to try and raise the sagging ratings by making it more like [[Film/TheAvengers the movie]]. Comicbook/IronMan, CaptainAmerica, [[Comicbook/TheIncredibleHulk the Hulk]], [[TheMightyThor Thor]] (the four Avengers with solo movies in the [[MarvelCinematicUniverse MCU]]) were given increased prominence, leading to the other Avengers falling OutOfFocus. The new creators also tried to minimize potential ContinuityLockOut moments by making most of the episodes into done-in-ones, in contrast to the serialized nature of the first season.
* Creator/CartoonNetwork's acclaimed {{Toonami}} block received this in 1999, arguably for the better.
** [[OldShame And then]] came [=CNReal=]. It wasn't successful, though.
* An In-Universe example in ''WesternAnimation/SouthPark'' episode "Whale Whores". When Stan Marsh overtakes ''Series/WhaleWars'' reality show, he begins some radical actions to save whales and dolphins, but everybody sees it just a retool of the show.
* ''PinkyAndTheBrain'' was retooled into ''PinkyElmyraAndTheBrain'' after ExecutiveMeddling forced [[CreatorsPet/WesternAnimation the annoying Elmyra]] into the main cast.
** An in-universe example happens when the show's ratings go down a tiny bit and the executives decide to add a few new changes to the show. Instead of a lab, they now live in a house in the suburbs with their [[CousinOliver adopted kids]] (one of them being an [[FamilyMatters Urkel]] [[{{Expy}} Expy)]] and a [[RobotBuddy sassy robot.]] [[WhoWritesThisCrap Naturally, Brain immediately quits.]] It's been suggested that this was written as a response to what the writers knew was coming. The network didn't get the message and the retooled series lasted five or so episodes.
* ''KaBlam'' got slightly re-tooled in it's second season, giving new personalities to Henry and June, changing the overall look of the characters, and ArtEvolution and new theme tunes for some of the shorts. Also, the jokes were less "random" than the first season.
** The show was also briefly retooled in the fourth season. The comic book-setting was pretty much abandoned (with the exception of "turning the page", though they really couldn't get rid of that, as well as the opening and ending themes), the show's TV studio setting was more apparent, the jokes in the Henry and June segments became less random and more "mature", and most of the "classic" shorts skipped a few episodes.
* Disney's OneSaturdayMorning was retooled twice. In September 2000, the original hosting segments from 1997-2000 which took place inside the One Saturday Morning building with live action hosts on the virtual set were axed, along with all the shorts which aired in-between programs (Excluding ''WesternAnimation/SchoolhouseRock'' which ran until 2001). The new on-air bumpers would feature live-action kids playing in a park (Along with the "1" logo, and in the opening, the cast of ''WesternAnimation/{{Recess}}'', ''WesternAnimation/TheWeekenders'' (2000-2002), ''WesternAnimation/TeachersPet'', ''WesternAnimation/LloydInSpace'' (Beginning in 2001), and ''WesternAnimation/TeamoSupremo'' (2002; replacing ''The Weekenders''), which was also used for the new version of the theme song along with said characters. The new theme song was the same as the old one, but sung by a young girl and was shortened. In 2002, shortly before the switch to ABC Kids, repeats of DisneyChannel shows began airing.
** The block was then retooled and rebranded into ABC Kids in September 2002, the same day Disney's purchase of the FoxKids assets following their buyout of Fox Family (Into ABCFamily) which was included with the sale. The new motif was that the on-air bumpers had each show's characters interacting in a stadium setting. Due to the retool, every show on One Saturday Morning that ''weren't'' repeats of Disney Channel shows were quickly cancelled, with the remaining episodes of ''Teacher's Pet'', ''The Weekenders'', ''Lloyd in Space'', and ''Teamo Supremo'' would be dumped off on ToonDisney. The only show to survive the block switch was ''Recess'' (Which was in reruns), due to high demand (It was the highest-rated ABC animated show, highest-rated Saturday morning cartoon, and third highest rated animated series in the late 1990s) and ABC wanting to renew the show for another season to add to the [[SixtyFiveEpisodeCartoon initial sixty-five episodes]]...which unfortunatly never happened. The only new shows to premiere on the block were ''WesternAnimation/{{Fillmore}}'' and various ''Franchise/PowerRangers'' series following the purchase of the franchise. Everything else on the block were repeats of Disney Channel shows, and by the time the block came to an end in 2011, the entire lineup was made up of nothing but Disney Channel reruns.
* In the second season of ''{{WesternAnimation/Gargoyles}}'', the show changed its stationary New York City setting for a [[ArcFatigue loooong arc]] following Goliath, [[AffirmativeActionGirl his long-lost daughter Angela]], Eliza and Bronx on a magical tour around the globe, most of whose episodes were a PoorlyDisguisedPilot for some animated spin-off that were never picked.
* Season 5 of ''WesternAnimation/{{Archer}}'' starts with [[spoiler:ISIS being shut down by the FBI and the characters deciding to start a drug cartel.]] The season has even received the official nickname of "[[spoiler:[[MiamiVice Archer Vice]]]]."
* ''Franchise/HeroFactory'''s ''Invasion from Below'' episode showed shades of this. It ignored the previously set up {{Cliffhanger}}(s), [[TheOtherDarrin gave all the characters new voices]], [[ArtEvolution new designs]], disregarded some of their earlier character traits, and had a new intro and closing sequence. Even so, the toyline it's based on has a continuous story, and it remains to be seen if the animated specials will follow this standalone format, or go back to the original setup.
* ''WesternAnimation/ChalkZone'' received a minor retool while it was on ''WesternAnimation/OhYeahCartoons'', occurring between the first two shorts in 1998 and the remainder of them in 1999, and eventually into the show itself. Starting with the second season of ''Oh Yeah! Cartoons'' in 1999, Rudy was aged up from eight to ten (WordOfGod says this was due to Nickelodeon wanting to give the short a TV show, but requested that Rudy had to be aged up) and Penny was added as a third protagonist. Besides that, the only other difference was that [[ArtEvolution the art style improved]] (compare Snap in the first two shorts to the rest of the shorts and the show).
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