Ret Canon

If an adaptation of a series is popular, it will leave its stamp on subsequent adaptations. More strangely, a popular adaptation may leave its stamp on the series it was adapted from, if that series is still ongoing. Ret Canon is when elements from an adaptation of a work (or the adaptation as a whole) is later made canonical due to the source material acknowledging it or Word of God stating it as such.

For the more general application of changes to the work, see Retcon.

The Canon Immigrant is often a walking example of Ret Canon. See also: Recursive Adaptation, Adaptation Displacement, and Canon Discontinuity.

Examples:

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    Anime and Manga 
  • Dragon Ball:
    • Emperor Pilaf's dog henchman was originally named Soba in the manga. After the TV show gave him the name Shuu, Toriyama incorporated it into the manga (as he'd forgotten he previously named the character).
    • Akira Toriyama was so impressed with the TV special featuring Goku's father Bardock that he subsequently incorporated the character into the manga for a two-panel flashback to the ending of the special, making Bardock the only anime-original character to be featured in the manga. Even Dragon Ball Kai—a true to the manga recut of the Dragon Ball Z anime with 99% of the filler taken out, includes Bardock's death at the hands of Freeza as the introductory scene.
    • Ultimately downplayed when Toriyama wrote the prequel Dragon Ball Minus in 2014. In Dragon Ball Minus, Bardock's personality and family wound up greatly different than what was seen in the TV special, save for Bardock's eventual death.
    • Since his introduction in the first movie bearing his name, Broly has become quite popular with fans due to his immense power and just all-around impressive design. While the character himself has since been killed multiple times over and is unlikely to appear in the canon series, Toriyama appears to have introduced his transformation, the Legendary Super Saiyan, into Dragon Ball Super's Universe Survival Saga, with new character Kale heavily implied be the Legendary Super Saiyan of Universe 6.
  • Shortly after the Negima! alternate universe adaptation introduced Armor Nodoka's ability to split her Diarium Ejus up to read multiple minds, the Nodoka of the manga gained this ability as well (though her version actually shrinks the books based on how many splits she's used).
  • A character was brought Back from the Dead in Ga-Rei because of Ga-Rei -Zero-. A lot of later flashbacks also borrowed from the anime.
  • Excalibur's song in Soul Eater was something invented for the second episode about him in the anime, which was not based on anything in the manga. The next time he appeared in the manga, Excalibur started singing the song.
  • After the release of the Cyborg 009 animated films in the '60s, Executive Meddling from Shotaro Ishinomori's editor forced him to change 007 into a young child in order to match his movie counterpart. Ishinomori hated having to do this, and eventually dropped this aspect in later stories.
  • Revolutionary Girl Utena is an odd case. The manga began serialization first, but the show is considered the main canon, and for a time they ran simultaneously. This lead to both works influencing each other simultaneously, and it's not always possible to tell where an idea first originated. Some examples:
    • Anthy's Rose Bride dress was white in the original manga, but was changed to red to match the TV show. The movie compromised by making the dress two-tone, with the front and back being white and the sides being red.
    • Likewise, Utena's male uniform is black in the TV show, but pink in the original manga. The manga eventually had a chapter where Utena received the black uniform from the TV series after her original one was damaged. Chu-chu received his ring and tie from the show at the same time.
  • In Super Dimension Fortress Macross, Exedor is shown as a weedy but otherwise normal Zentradi with red hair. In Macross: Do You Remember Love?, his appearance is instead one of slight Body Horror, with a bulging, pulsating brain under his scalp that could extrude pseudopods. When the character returned for Macross 7, the Do You Remember Love appearance became his stock appearance, the official Retcon being that he had to alter his body after the ill effects of micronizing and macronizing himself multiple times became apparent.
  • The female Ranma in Ranma ˝ initially had black hair, but after the TV show changed it to red, Rumiko Takahashi began coloring it as such in the manga.
  • Lum originally had iridescent hair in the Urusei Yatsura manga, which fit nicely with her bizarre, inhuman appearance. However, since iridescent hair was impossible to animate on a TV budget in the 1980s, and is still very difficult to do even today, the anime adaptation gave her green hair instead. The green hair became so popular and iconic that it was retconned into the later chapters of the manga.
  • The 2003 re-release of the original Sailor Moon manga was renamed "Pretty Guardian Sailor Moon" after the live-action show. The updated release also incorporated the show's habit of referring to the girls as "Guardians" instead of "Soldiers," an idea that has since been used in most of the subsequent additions to the franchise (including Viz Media's uncut English dub of the '90s anime) as well. An unnamed move Ami used early on in the manga was also changed to the "Mercury Aqua Mist" attack from the TV show.
  • Naruto:
    • Gaara is described as having brown hair in early manga chapters, much like his brother Kankuro. In the anime, that was changed so that he was an Evil Redhead. Eventually, the manga made Gaara into a redhead as well.
    • Naruto and Hinata having their first meeting as children, when Naruto got beaten up while saving Hinata from a trio of bullies, was a scene created exclusively for the anime, appearing in the considerably expanded Shippuden Episode 166 as a flashback she recalled during her fight against Pain. No such scene or early meeting between them was ever hinted at in the manga itself. However, when The Last: Naruto the Movie was made to outline how they finally got together between the penultimate chapter and the Distant Finale, the very first scene of the movienote  was a somewhat-modified version of this first meeting scene. Because The Last is the first canon movie of the franchise, this retroactively canonized Naruto and Hinata's first meeting, and also officially made Hinata both the First Girl After All and First Girl Wins. While some elements were changed in the canon version of the scene—mainly that the event took place in the wintertime and Hinata was not dragged away by her bodyguard Ko after Naruto got beaten up—it's otherwise near-identical to the original Shippuden flashback.
  • Most Yu-Gi-Oh! English dubs have started using jokes similar to the abridged series.
  • In the Fate/stay night DEEN anime adaptation, Archer strengthens his two signature swords, tripling their size and increasing their power. This was an ability he never displayed in the actual visual novel, but reportedly Kinoko Nasu liked the idea, and the "Overedge" forms of the swords have frequently made appearances in other stories and adaptations featuring Archer, including some written by Nasu himself.

    Comic Books 

DC Universe:

  • Batman's Battle Butler Alfred was originally drawn as a stout and clean-shaven man, but in 1944 he was dispatched to a health resort from which he would return thin and mustached so that he would resemble William Austin's portrayal in the 1943 serial. Also, he originally died in the comics but the 60's Adam West series got him revived. The change was spoofed in a 1994 "Zero Hour" story that ostensibly took place after Alfred had left Bruce Wayne while they were tracking down Bruce's kidnapped girlfriend and Tim Drake's father in England (though he came back about a year later); Batman and Robin are confronted by a short, fat, non-mustached, Cockney-accented double of Alfred reminiscent of the early 1940s portrayal, and immediately remark that Alfred doesn't look like himself. Alfred then reminds them of his resort vacation, which (in the new continuity) he has just returned from, and explains that the resort was not a health spa at all, but a school for private detectives (the "new" Alfred wants to follow in his employers' footsteps). The short, fat Alfred eventually disappears long before the real Alfred returns.
  • The Batcave also originated in the serials.
  • The now-iconic green-suit-and-bowler-hat costume for the Riddler was introduced in the 1960s live-action series, where it was designed by actor Frank Gorshin because he seriously hated the tights. It is now a rare thing to see the Riddler in his original tights in the comic books.
  • It may seem hard to believe, but Catwoman didn't wear a black costume until the 60's Batman and Batman Returns. Prior to (and long after) that, she usually wore first green and later purple in the comics. It wasn't until Darwyn Cooke's revamp in 2002 that she officially adopted a black Spy Catsuit in the comics.
  • Batman began wearing a black Batsuit that looked like the one from the Tim Burton movies during the "Troika" storyline that was published after Knightfall. Unlike Catwoman, he eventually went back to his more familiar grey and black color scheme after a while.
  • Batman's Grappling-Hook Pistol also originated in the first Tim Burton Batman movie.
  • The Batman storyline "The Destroyer" ended with Gotham sporting a redesigned look that resembled the city's retro art deco depiction in the Tim Burton movies.
  • The Batmobile has had its famous jet exhaust since the '60s series added it.
  • The giant penny first appeared in the Batman newspaper comic, before it ever appeared in the comic book.
  • The idea that Jim Gordon met Bruce Wayne on the night of the Wayne murders originated in Batman Begins, and has since made it to the comics (and also subsequently served as an inspiration for the premise of Gotham). Before this, in Batman: Year One, Gordon started his career in Chicago and only moved to Gotham just as Bruce is returning to Gotham from his travel to learn the skills he'd use as Batman.
  • This seemed to be likely but was then averted in regards to Bane. In Arkham War he wears a jacket like the one Tom Hardy wore in The Dark Knight Rises, but ditches it by the next issue.
  • The last issue of the New 52 Nightwing series brings in a phrase from The Dark Knight Saga: ''"why do we fall? So that we can learn to pick ourselves up." However, the phrase isn't used in this inspirational way, with Dick Grayson saying "no, we fall because someone pushes us. We get up to push back."
  • It was Marlon Brando's idea to have Jor-El wearing a recognizable 'S' logo in the 1978 Superman: The Movie, making it a preexisting Kryptonian emblem rather than merely a personal symbol of Superman. This change filtered into the comics awareness, explicitly finalized in the 2003 title Superman: Birthright.
  • The mainstream continuity Superman temporarily adopted a black background for his chest emblem like his Kingdom Come counterpart. Like his KC counterpart, it was to mourn mass death, in this case from the Our Worlds at War storyline.
  • The childhood of Clark Kent was changed once in response to the Movie with his powers developing gradually and no career as Superboy, and later it was changed again to become closer to the portrayal in Smallville, including restoring Lex Luthor as a Smallville resident and friend of Clark (which, ironically, is what they had changed him from Post-Crisis).
    • His career as Superboy was a retcon in itself. The original telling of Superman's origin in Action Comics #1 had him raised in an orphanage, and his super powers developing slowly during adolescence.
    • Smallville itself first appeared in the earliest Superboy comics, but they never specified exactly where in the country it was located until after the Movie had put it in Kansas.
  • Indeed, the whole cold, antiseptic look of the Post-Crisis Krypton was taken from the movie. Ironically, Superman: Birthright undid this change, moving it back toward the Silver Age version.
    • Post-Infinite Crisis, Krypton is even more like the movie version than it was post-Crisis. Superman's fortress is now the same crystalline structure seen in the films (and in Smallville), complete with Jor-El hologram.
  • Also, after the movie, many artists drew Superman resembling Christopher Reeve. With John Byrne being the first, because he couldn't follow the style of Curt Swan.
  • Lex Luthor's father being named Lionel is an import from Smallville.
  • Also, Luthor's iconic suit of green Powered Armor was designed by George Perez for the Super Powers Collection action figure line from Kenner. Due to the turn-around time, it actually showed up in the comics before the toys were even on the shelves.
  • When she first appeared in Superman's Pal Jimmy Olsen, Miss Gzptlsnz was drawn with small, implike proportions similar to those of Mr. Mxyzptlk, of whom she is a Distaff Counterpart. After Superman: The Animated Series completely redesigned her into a tall, leggy redhead, artists began using this as her appearance in the comics as well.
  • The Hall of Justice from the Superfriends cartoon was made canonical in the comics after Infinite Crisis.
  • In both the Golden and Silver Age, Wonder Woman had the magic lasso — which could compel total obedience from anyone caught in it. As one might imagine, she had it used on her pretty regularly. As this was regarded as a little squicky for television, the lasso's ability to compel was reduced to being able to force its captive to tell the truth. This is now so canonical, The Other Wiki doesn't even mention the original ability.
    • More recently, Wondie has started spinning around to change her clothes, a magical transformation used in the 1970's TV show, but not in the comics until twenty years later, when Promoted Fanboy Phil Jimenez was writing and drawing the book.
  • Wonder Woman's enemy Giganta was originally a gorilla who mutated into a human woman with enhanced strength. The Super Friends cartoon completely overhauled her powers by giving her the ability to grow to gigantic proportions, a change that was later adapted back into the comics.
  • Batman: The Animated Series:
    • Ever since the show redefined Mr. Freeze as a tragic figure, consumed for the lost love of his stricken wife, the original comic version was changed to resemble that. Originally, he was just a villain with a gimmicky weapon with no back story, a version that later appeared in The Batman. This backstory was removed in the New 52, to move Freeze more in-line with the rest of Batman's rogues gallery, but was reinstated in DC Rebirth.
    • The name "Mr. Freeze" is itself a case of this, as before the old Adam West show, he was known as Mr. Zero.
    • Based on the popularity of the animated series version of the Clock King (Temple Fugate), a new Clock King with the same name and dress was introduced to The DCU (though instead of Awesomeness by Analysis powers, this version has actual precognitive abilities as well as a sadistic streak).
    • The series also went with the Batgirl moniker to make Barbara Gordon begin using that identity as a student rather than a librarian as it originally was, and given this change in age, she got a flirting relationship with Robin (Dick Grayson, now Nightwing in comics). Now flashbacks tend to show Barbara getting her Batgirl identity at her teens, and having an on-off relationship with Nightwing (who, before that, was mostly interested on his Titans teammate Starfire, so Ship-to-Ship Combat abounds).
    • The series also introduced the idea of Bruce Wayne being childhood friends with Zatanna, which was later made canonical in the comics by Paul Dini after Infinite Crisis. Prior to this, Batman had been portrayed as being much older than Zatanna. Only the later series Young Justice has kept Zatanna younger, making her a peer of Robin.
  • The New Batman Adventures, the sequel show to Batman: The Animated Series, featured revamped designs for every character, in order to streamline the show's look to make it easier to animate on the smaller budget, as well as to make it more compatible stylistically with Superman: The Animated Series. Most of the new designs were poorly received (especially the Joker's), but one in particular that most people seem to like is Scarecrow's. It didn't look much like an actual Scarecrow (more like a western preacher), but it was pretty creepy (which is good considering fear is the Scarecrow's whole shtick). The staff liked the outcome, particularly since they'd fiddled around with different designs before and found them ineffective. Since TNBA, many versions of Scarecrow incorporate that version's distinctive hanged man's noose.
    • Two more from The New Batman Adventures. Between the end of "No Man's Land" and the end of the events of "The Return of Bruce Wayne", Batman had returned to using the original/"Year One" costume, which was what the costume he wore in TNBA (and Justice League) was based on. Likewise, after the "One Year Later" Time Skip after Infinite Crisis, Tim Drake donned a tweaked version of the costume he wore during TNBA.
    • A few years after The New Batman Adventures returned Batman to his Year One costume, the comics followed suit.
    • Starting with The New Batman Adventures, almost all animated versions of Nightwing have had some version of the same chest-logo; a blue hawk with serrated wings and its head in profile, based loosely on the then-current comics costume which had a blue V-shaped yoke suggesting wingsnote . When Dick returns to the Nightwing identity in Rebirth, he adopts a new costume which is the first appearance of the hawk logo in comics continuity.
  • Static was given both of his costumes from the Static Shock cartoon; the original in the Rebirth of the Cool limited series, and the second after joining The DCU around the time of Final Crisis. Note that Static's original outfit looks nothing like either of the suits from the cartoon.
  • After 2001's Justice League cartoon featured a Hawkgirl as a member, writer Joe Kelly chose to add the DC Universe's then-current Hawkgirl to the contemporary JLA (even though this was a different character, connected to the Golden Age Hawkgirl rather than the Silver Age version from which the cartoon's heroine was adapted).
    • Justice League also introduced the idea that John Stewart (Green Lantern) was a Marine, an idea that's since filtered into the comics.
    • John Stewart also returned to being an active Green Lantern and joined the League during Kelly's JLA run and started wearing the same costume he wore on Justice League (sans gloves) and the same haircut the animated Stewart had in the first two seasons.
    • While John Stewart has yet to sport the "bald with goatee" look from the Unlimited seasons, Power Ring does sport a similar one, thanks in part to the events of JLA/Avengers destroying and rebuilding the Crime Syndicate's universe, giving him a Race Lift that changed him from a blonde Kyle Rayner counterpart into a counterpart for Stewart. Also after joining the post-Infinite Crisis incarnation of the League, John joked about Black Lightning's current bald look, then said he'd looked look good bald with a goatee.
    • When Vixen rejoined the Justice League after Infinite Crisis, she was given her look from Justice League Unlimited.
    • Likewise, in Justice League: Generation Lost, Ice got a new costume resembling her Justice League Unlimited design.
  • The Teen Titans cartoon debuted in the same month as a relaunch of the Teen Titans series. Both took inspiration from the classic 80s Marv Wolfman/George Perez "New Teen Titans" series, but it was also pretty obvious that DC was making their properties look similar across the board.
    • The cartoon team was composed of Robin, Starfire, Cyborg, Raven, and Beast Boy. The comics team was composed of former Young Justice members Robin, Superboy, Wonder Girl, and Kid Flash, with the 80s Titans Starfire, Cyborg, Raven and Beast Boy returning. The comics team thus superficially resembled the cartoon team - only with the former Young Justice members, most notably Robin, being Legacy Characters of the 80s Titans. At least some of the older Titans were not even teenagers by this point, having aged into their 20s. Notably, comics Raven, in spirit form before the relaunch, was given a new teenage body just for the series, and Gar Logan's codename, then Changeling, reverted to Beast Boy (despite being more like Beast Man).
    • Many of the characters in the cartoon saw their comic versions' costumes get redone to match (or at least more resemble) their animated counterparts. Even Starfire (whose ultra-stripperiffic bikini-like "armor" isn't going anywhere anytime soon) has her boots changed to resemble series Star.
    • In the comics, Beast Boy/Changeling looked like a normal boy who just happened to have green skin and hair. After the cartoon gave him a more bestial appearance, the comics gave him fanged teeth and pointy ears to match his television counterpart.
    • The romantic subtext between Raven and Beast Boy in the cartoon made it into the comics in a bona fide squee moment. The author claims he didn't do this because of the show, though.
    • Bumblebee's shrinking abilities were also introduced in the show, before being made canonical in the comics after Infinite Crisis. Prior to that, she simply had a suit of bee-themed Powered Armor.
    • A '90s Titan named Joto was revamped as "Hotspot" in the toon note , and received flamethrower powers as opposed to simply using heat generation. After Infinite Crisis, the comic Joto inexplicably took on the flaming head look of his animated self, the "Hotspot" codename, and began using fire as an ability.
    • The show gave Cyborg the memorable Catch-Phrase "Booyah!", which was later worked into the comics.
    • The show changed the Titans' battle cry from "Titans, together!" to "Titans, go!" The latter has since been adopted in the comics.
  • Superman flies because the Fleischer cartoons found it easier to animate flight than jumping. Simultaneously, the radio show started depicting Superman flying so that they could fit plot exposition into scenes while he traveled place to place. However, the radio show avoided calling it flight. Most of his other powers came from the radio or cartoon shows, too. Initially, he was just as the opening sequence described him: faster than a speeding bullet, more powerful than a locomotive, and able to leap tall buildings In a Single Bound. Heat vision, super breath, and more were largely later additions.
    • Action Comics (DC) itself also gradually drifted toward flight due to artist mistakes. As artists depicted Superman performing more and more impossible maneuvers in midair, AC writers explained it away as his ability to change trajectory in midair. When Fleischer, who had followed the comics and radio show, asked point-blank if Superman could fly, AC gave up and said he could. It didn't become official though until a 1942 Superman novel written by the head writer of the radio show, where it explicitly stated Superman flew across the Atlantic Ocean to stop a Nazi rocket missile. By 1943, Superman could fly 8 times the speed of light.
  • Though General Zod already existed in the comics before and after Superman II, his backstory became such a mess that eventually DC decided to make a "definitive" reboot of the character based on his most iconic version: that of the aforementioned film.
  • Kryptonite was first introduced on the Superman radio show in 1943, before being incorporated into the comic book.
  • After Superman Returns was released, Superman's costume in the comics was slightly altered to make it match the costume's appearance in the film; most notably adding an "S" belt buckle like the movie costume. This was undone after a few years and the previous look of the costume returned.
  • When The Flash got a TV series, a couple of small changes were made in the comic: Wally got a dog and a new costume with a symmetric belt like the one on the show. This was only fair since the TV Flash, while based primarily on Barry Allen, also borrowed elements from Wally (such as his post-Crisis need for huge amounts of food).
    • During Flash: Rebirth Wally gained yet another new costume that was even more inspired by the live-action suit. It had the pointed, Batman-like nose and the darker color scheme, in addition to the aforementioned belt. The costume also added a logo similar to the one on Wally sported in Justice League.
  • The Source Wall as a concept was alluded to in the New Gods, but did not physically appear until an out of continuity 1982 crossover between the X-Men and Teen Titans. Everyone liked the design so much that it was incorporated into the mainstream continuity, with even Jack Kirby himself utilizing it.
  • The Brightest Day and New 52 versions of Firestorm were inspired by the character's portrayal in Batman: The Brave and the Bold. While the Jason Rusch/Ronnie Raymond combo had shown up in the comics before, it was the TV show that established Jason as a Child Prodigy. Prior to that, he was mostly an average student who relied on Professor Stein to provide Firestorm's science knowledge.
  • Supergirl:
    • Despite Superman: The Animated Series's version of Supergirl being Kara In-Ze, an adaptation of Kara Zor-El, the then-current Supergirl in the comics, Linda Danvers, was given the "white shirt, hot pants" Supergirl costume used in the series.
    • Before that, Supergirl was given a new costume in the 80's (the one with the headband that she wore until her death in Crisis on Infinite Earths) to match the one designed for the Supergirl live-action movie. The producers then changed their minds and decided to go for the classic, iconic Supergirl outfit in the movie instead, but the comics ended up sticking with the new suit since by that point, it was too late to get rid of it.
    • National City from the Supergirl TV show is now part of the DC Universe as of Supergirl (Rebirth).
    • Rebirth also had Supergirl adopt the alias "Kara Danvers," her civilian name in the show.
    • Her foster parents Jeremiah and Eliza Danvers also first appeared in her TV show. Her enemy Selena hails from her 1984 film feature.
  • Martian Manhunter's secret identity was originally Caucasian in his secret identity of John Jones. After he was played by Phil Morris in Smallville. Morris asked the showrunners if J'onn transformed himself into a Black man because he still felt like an outsider in society and this reflected that. They said "sure, why not?", and while that idea hasn't made its way into the comics, the John Jones identity being a black man has, and also carried over into his incarnations in Justice League: Doom, Young Justice and Supergirl, and most modern audiences are only familiar with John Jones being Black.
  • As of the New 52
  • A single-medium version: The idea that the Crime Syndicate's Superwoman had the secret identity of Lois Lane was introduced by Grant Morrison in JLA: Earth-2, and carried over to the New 52 Earth-3 seen in Forever Evil. When the original Pre-Crisis Syndicate appeared in Convergence, it followed suit, even though Pre-Crisis Earth-Three's Lois had clearly been established as the wife of the heroic Alexander Luthor, a point that had been used in the comics as recently as Infinite Crisis.
  • DC Rebirth:
    • Vixen now sports the same costume she wears in her animated series and Arrow.
    • As mentioned above, National City from the Supergirl TV show is now part of the DC Universe as of Supergirl (Rebirth), and Supergirl now uses the name Kara Danvers.
    • Bumblebee has a new haircut resembling the one she has in DC Super Hero Girls. She can also shrink and fire energy blasts from her palms like she did in Young Justice.
    • Wonder Woman now has a new costume heavily based on the one she wears in the DCEU.
    • Katana's New 52 costume was damaged in the Suicide Squad Most Wanted mini-series, leading to her adopting her look from the Suicide Squad (2016) live-action movie. She also now wields a second, shorter blade as a side arm, much like she does in the film. However, she ditches both by the time the new Suicide Squad ongoing, which released the same week as the movie, debuted, weirdly enough.
    • The League of Shadows from The Dark Knight Saga appear in Detective Comics.
    • Ryan Choi's new armored costume is heavily based on the one worn by Ray Palmer in Legends of Tomorrow.
    • Magpie has been redesigned to resemble her counterpart from Beware the Batman.
    • Merlyn's real name has been changed from Arthur King to Malcolm Merlyn, his name in Arrow. He also calls himself the Dark Archer, his alias from both Arrow and Smallville.

Marvel Universe:

  • Following the success of the 2000 movie, the X-Men switched to dark leather costumes which more closely resembled those of the movie. The leather costumes only lasted until 2004, when they returned to more traditional superhero costumes.
  • Toad's markedly different appearance and advanced powers from the first movie (a mostly regular-looking guy with a prehensile tongue and amazing acrobatic skills as opposed to a deformed hunchback who just jumps around a bit) were also copied, with the changes taking place in the 2001 X-Men Forever limited series. That same story also had Mystique adopt her scaled, reptilian appearance from the movies, with both characters' new looks brought about by an accident involving an alien regeneration device. While Toad ended up keeping the tongue and acrobatic abilities, Mystique went back to her classic appearance not long after.
  • As a minor example, Rogue used to have a white Skunk Stripe, across her head from front to back. Ever since the movies, only her front bangs have been white (even in X-Men Forever, where her original hair style, at least at first, should have been retained).
  • Many artists since 2000 showed Wolverine's claws coming from between his fingers as opposed to the backs of his knuckles. Also, like the Superman example, some artists have drawn Wolverine looking like Hugh Jackman.
  • Magneto's plastic prison from the movies was used in Ultimate X-Men.
  • It may shock people to learn that the idea of the Xavier Institute as an actual school was also something that came from the movies. Originally, the school aspect was more of a cover story than anything, and the only actual "students" were the X-Men themselves. Then the first movie came out and introduced the idea of the Institute as a real school with numerous mutant students, and Grant Morrison subsequently made the idea canonical in the comics.
  • For a time, Lady Deathstrike was redesigned to resemble her counterpart from X2: X-Men United, complete with dark hair and a black leather outfit. She was also Retconned into being William Stryker's close personal friend and enforcer, despite the two never having met on-panel before that point.
  • Due to the popularity of X-Men: First Class, Marvel launched First X-Men, a prequel series about an early incarnation of the team led by Magneto and a not-yet-disabled Professor Xavier. However, it seems plans changed, as Xavier and Magneto ended up as Advertised Extras; the team was actually led by Wolverine and Sabretooth.
  • Gambit's role in X-Men Origins: Wolverine led to the Weapon X: First Class mini-series, which established that as a teen, Gambit was present at the Weapon X facility the night Wolverine made his fateful escape.
  • In X-Men Origins: Wolverine, Logan voluntarily goes through the Weapon X process. In Sabretooth Reborn a flashback establishes Logan did volunteer for the process, and the memory had been forgotten. That entire run entered Canon Discontinuity soon after, so it's not clear if this is still canon.
  • In the original comics, Iceman was a founding member of the team and about the same age as Cyclops and the other X-Men. The movie made him a teenage trainee who was significantly younger than the real X-Men, and this eventually carried over into Ultimate X-Men and X-Men: Evolution.
  • Battle Scars introduces Nick Fury Jr. as the Marvel Universe version of Nick Fury, inspired by Samuel L. Jackson playing Nick Fury in the Marvel Cinematic Universe, inspired by the Ultimate Marvel version of Nick Fury resembling Samuel L. Jackson. Battle Scars introduces Phil Coulson to the Marvel Universe, based on Phil Coulson from the Marvel Cinematic Universe.
  • Post-AXIS, Quicksilver has been given a new costume that incorporates his goggles from X-Men: Days of Future Past.
  • Sabretooth's post-AXIS design draws some inspiration from Liev Schreiber's portrayal of the character in X-Men Origins: Wolverine, namely the shorter haircut, mutton chops, and less bestial appearance.
  • Jean and Cyclops got married because of a planned plot from Season 2 of the hit X-Men animated series. Interestingly, Bob Harras also asked the writers of the cartoon to hold off on having them tie the knot for real, which is why in the show, the wedding turned out to be the work of Mr. Sinister.
  • Negasonic Teenage Warhead was redesigned in the Deadpool & the Mercs for Money series to resemble her counterpart from the Deadpool movie.
  • Circa 2005, Spider-Man gained biological webshooting powers like those portrayed in his eponymous 2002 movie. Continuing the trend, in 2007, the "Back in Black" storyline, wherein Spidey starts wearing the black costume again, echoes Spider-Man 3, which is a retelling of the original black costume storyline.
  • In the original Black Costume saga, the symbiote did not affect Peter's personality, at all. It just made him tired because it would take his body out crime fighting while he slept. The addition of it making him more violent and mean came from the '90s cartoon.
  • Speaking of symbiotes, the 90's Venom: Lethal Protector series introduced five unnamed symbiotes that had been spawned from Venom by the Life Foundation. For branding purposes, ToyBiz's "Planet of the Symbiotes" toyline named the yellow and green symbiotes Scream and Lasher, respectively, and the names were subsequently canonized by later writers.
  • According to Word of God, the second Superior Spider-Man costume was directly inspired by the unused design Alex Ross created for the first movie.
  • The Spider-Cycle from the Ultimate Spider-Man cartoon appeared in an Imagine Spot in issue #200 of the Ultimate Spider-Man comic.
  • "Web Warriors", the subtitle of Season 3 of Ultimate Spider-Man, was later imported into the comics as the name of a group of Spider-Heroes from across the multiverse.
  • The famous phrase "with great power Comes Great Responsibility" was shortened from a longer form and attributed to Uncle Ben by Retcon. (It was originally spoken by the narrator.) The first time the phrase was actually attributed to Uncle Ben was in The Amazing Spider-Man: A Rockomic!, a Spider-Man themed rock opera from the early 70's.
  • The Amazing Spider-Man 2 did away with Electro's mask and green tights, and completely redesigned him so that he now resembled a pulsing blue Energy Being (which itself was taken from Ultimate Spider-Man). In turn, the comics ditched Electro's mask and established that thanks to Power Incontinence, he had now begun turning blue whenever he used his electrical abilities.
  • The supervillain Bullseye originally wore a costume with a mask that had a bullseye design on it. In the 2003 Daredevil movie, Bullseye instead dressed like a biker and had a bullseye scar directly on his forehead. The comics followed suit by having Bullseye adopt the biker outfit in Kevin Smith's Daredevil/Bullseye: The Target mini-series, and Brian Bendis later incorporated the scar by having an enraged Daredevil carve a bullseye into the forehead of his nemesis. A variation of the movie-style design was also used in The Punisher MAX.
  • The Ultimate version of Elektra wears a black costume similar to that of her movie counterpart. After the success of the Daredevil Netflix series, the mainstream version of Elektra began wearing an outfit similar to Elodie Yung's.
  • Characters from the Netflix adaptation of Daredevil such as Mitchell Ellison and James Wesley were integrated into comics published afterwards.
  • Matt Fraction made the Thing Rings from Fred and Barney Meet the Thing canonical in FF. Though in this case, they're used by Darla Deering rather than Ben Grimm.
  • Captain America's sidekick, The Falcon, briefly wore the same armored costume he wore in the short-lived The Avengers: United They Stand animated series. However, when he rejoined the Avengers a few years later, he ditched the threads.
  • Speaking of Cap, the popularity of the Marvel Cinematic Universe films led to his comic counterpart sporting an outfit that looks greatly inspired by his appearances in Captain America: The First Avenger and The Avengersnote  as part of the Marvel NOW! relaunch. Said costume does away with the flared gloves and buccaneer boots, replacing them with more utilitarian gloves and combat boots. The familiar chainmail of his old costume is replaced with a more modern-looking armor design, as well. Finally, a blue helmet with painted-on wings takes the place of his winged mask, and it has a chin strap like most of his MCU costumes do. He returned to his classic look, head wings and all, following Secret Empire.
  • A minor example, but Bucky Barnes got a redesign for the MCU too. His MCU counterpart sported a black half-mask for much of his first appearance, and so the comic book Bucky started wearing one for certain stories too, beginning with Winter Soldier: The Bitter March. In a strange case, he also regrew the long hair he'd previously cut, so it was long like it is in the MCU, which has Bucky sporting the appearance he initially had as the Winter Soldier in the comics.
  • The version of Whiplash seen in Ultimate Spider-Man is heavily inspired by Micky Rourke's portrayal of the character from Iron Man 2, right down to the arc reactor harness and Russian ethnicity.
  • The comic version of S.H.I.E.L.D. has since adopted the Avengers Initiative from the Marvel Cinematic Universe. The second volume of Secret Avengers sees S.H.I.E.L.D. using the Initiative to recruit its own team of superheroes, similar to the origin of the Avengers in the live-action film.
  • Hawkeye now wears a black leather costume similar to the one he wears in the Marvel Cinematic Universe. The movie costume is itself inspired by the one seen in The Ultimates, though the current mainstream outfit adds in some purple coloring.
  • The Iron Patriot armor returned to the Marvel Universe due to its use in Iron Man 3. It was used by Tony Stark in The Ultimates and, like in Iron Man 3, by James Rhodes in Secret Avengers. It was done away with after Avengers: Age of Ultron brought back the War Machine identity.
  • Blade's original powers were being immune to vampire bites, aging slowly and nothing else. He later picked up enhanced senses but didn't really become super in any sense of the word until his film came out.
  • The Hulk's reintroduction into the Avengers was also motivated by the films. In the original comics, he quit after one issue, but the Marvel NOW! relaunch has since seen him return to the team as a main character.
  • From the classic Age of Apocalypse, we've got the classic Sunfire later sporting his AoA counterpart's look, ironically as a horseman of Apocalypse. Earlier than that, Shadowcat briefly employed a claw device similar to the one used by her AoA self.
    • During Age of Apocalypse, mutants were classified as Alpha or Omega level (apparently the difference between mutants with a useful combat power and Mutants of Mass Destruction). This made sense in the Darwinian dystopia Apocalypse was running, but the terms migrated back to the main Marvel U for no apparent reason.
  • The all-ages Thor: The Mighty Avengers series made Heimdall black in order to better resemble Idris Elba's portrayal of the character in the Thor movies.
  • The movie version of the Chitauri (who were almost nothing like the Chitauri from The Ultimates) immigrated to the mainstream Marvel Universe as enemies of Nova.
    • The true face of the original Ultimate Universe Chitauri wasn't revealednote  until Hunger — when it was shown they look exactly like their movie counterparts.
  • In the lead-up to the Guardians of the Galaxy movie, Marvel had Star-Lord adopt the Badass Longcoat worn by Chris Pratt in the film. He was also rewritten to have a less serious personality, much like his film counterpart. Also, Nebula gained a vertical stripe running down her face like she has in the movie.
  • Agents of S.H.I.E.L.D. came up with the idea of giving Donnie Gill ("Blizzard") actual cryonic abilities, rather than having them come from his costume or Powered Armor. This change carried over into the comics, where Blizzard was revealed to be an Inhuman during Infinity.
  • Captain America: The Winter Soldier introduced a drug that Bruce Banner had designed to control Hulk-Outs. Though it proved ineffective on Banner, Nick Fury discovered that it could be easily used to create a Faux Death effect on normal people. This drug (with the same origin!) later appeared in All-New Invaders.
  • After becoming the new Captain America, Sam Wilson was redesigned and given a new costume that incorporates his red goggles and wing-pack from Captain America: The Winter Soldier.
  • The Redwing in Spider-Gwen is a robotic drone instead of a real bird, much like Redwing in Captain America: Civil War.
  • S.H.I.E.L.D. and the Avengers have been shown using Quinjet models that look exactly like the ones seen in The Avengers and Captain America: The Winter Soldier.
  • The War Machine drones seen in Avengers / New Avengers: Time Runs Out are based off the movie version of War Machine.
  • In an extremely controversial example, Marvel used AXIS to reveal that Quicksilver and Scarlet Witch aren't really the children of Magneto, mirroring their depiction in Avengers: Age of Ultron (where Magneto can't be used thanks to rights issues). Their powers were also retconned into being the result of scientific experimentation like in the movie, instead of naturally occurring mutations.
  • Despite being seen as a Dork Age, a number of elements from Heroes Reborn have stuck:
    • If one thing has stuck (besides the return of adult Tony and normal-looking Wasp), it's Tony sporting a Badass Beard in addition to his Badass Mustache. It's become so linked to the character that many recent incarnations, including the Ultimate Marvel and Marvel Cinematic Universe versions, have had Tony with it.
    • While it could just be a coincidence, when the Ultimate Marvel imprint decided to re-imagine the Avengers into The Ultimates, it reused the idea originally presented here of S.H.I.E.L.D. helping to set up the team. The Live-Action Adaptation of The Avengers reused the ieda, though it was likely inspired by The Ultimates.
    • The Falcon being a Military Superhero was also imported to the Ultimate Universe and the MCU.
    • In HR, Captain America was "deactivated" by President Truman after a disagreement over the use of atom bombs against Japanese civilians. This idea was integrated into the mainstream continuity during the controversial "Ice" story arc, where it was revealed that the government had Cap frozen so that he couldn't stop the atom bombs from being dropped on Hiroshima and Nagasaki. Of course, the story was so reviled that it was later rendered Canon Discontinuity, but still.
  • Doctor Erskine, the scientist who created the Captain America formula, was made a German defector in Captain America the First Avenger. This was imported back to the comics in Marvel Fact Files in 2013.
  • In the S.H.I.E.L.D. 50th Aniversary: Mockingbird one-shot, Bobbi is now in a relationship with Lance Hunter, a character she had never shared a comic book panel with before, because they're Amicable Exes in the Agents of S.H.I.E.L.D. series.
  • Similarly, Daisy Johnson was Retconned into being an Inhuman, half-Chinese, and long haired in order to match her portrayal on the show.
  • The Secret Warriors series was relaunched as a team of Inhuman heroes, much like on the TV show.
  • Darren Cross was an extremely obscure villain who was Killed Off for Real in the early 1980's after just two issues of Marvel Premier. His role as the Big Bad of the Ant-Man film got him resurrected, as well as in possession of Size Shifter abilities and a suit of Yellowjacket Powered Armor like he has in the movie.
  • When the Ultimate Marvel universe ended during Secret Wars, certain elements were integrated into the mainstream continuity. Ignoring the big Canon Immigrant cases like Miles Morales, there were story elements like the Triskelion or the use of the name "The Ultimates".
  • Cassie Lang's Stinger identity originated in the MC2 continuity, where Cassie was now grown up and a member of the Avengers. When the mainstream version of Cassie lost her Stature abilities following her death and resurrection, she became Stinger in the pages of Astonishing Ant-Man.
  • The country of Sokovia from Avengers: Age of Ultron was later made canonical in Nick Spencer's Captain America.
  • Misty Knight was redesigned to resemble her TV counterpart in Black Panther and The Crew.
  • In the 2016 Thanos series from Jeff Lemire and Mike Deodato, Thanos sports his design from Marvel: Contest of Champions.
  • Thor ("Odinson" at the time) gave himself an Important Haircut in The Unworthy Thor #3 so that he'd look closer to how he does in Thor: Ragnarok.
  • In the comics, the Nova Corps was wiped out quite some time ago, but All-New Guardians of the Galaxy later introduced a new, fledging Nova Corps patterned after the one seen in the first Guardians of the Galaxy movie.
  • During Civil War II, the Guardians of the Galaxy's spaceship, C.I.T.T. (Cool Interstellar Travel Travelship), was accidentally destroyed by The Vision. They ended up stealing a replacement vessel from a Nova Corps impound lot in the 2017 Free Comic Book Day special, which turned out to be the Milano, Star-Lord's ship from the movies.
  • Around the time Guardians of the Galaxy Vol. 2 came out, the comics did a storyline where Groot was shrunken down to a miniature size as the result of a villain's plot. This was Marvel's way of mirroring the Baby Groot plotline from the movie.
  • As of late, the comics have begun referring to the Infinity Gems as the "Infinity Stones," which is what they're called in the movies.
  • Lucia von Bardas from Secret War returned in Invincible Iron Man, now sporting her design from the Avengers: Earth's Mightiest Heroes cartoon.
  • The 2017 version of The Defenders exists because of the TV series and even features the same line-up: Daredevil, Luke Cage, Iron Fist, and Jessica Jones.

Other Comics:

  • Teenage Mutant Ninja Turtles:
    • The original comics were remarkably resistant to this, but an exception showed up with Casey Jones. Casey was originally introduced as a fairly loopy vigilante whose motivations mainly seemed to be watching way too much TV. However, in the 2003 cartoon he was given a You Killed My Father backstory involving the Purple Dragons gang and their leader Hun; Hun was imported into the Mirage comics late in the run of Tales of the TMNT, and Casey's background was updated accordingly.
    • Hun was based on an unused character for the Mirage comics named Copperhead.
    • The turtles' headbands were given individual colors to distinguish them in the cartoons. The comic followed the convention later.
  • Since the release of the video game adaptation of The Darkness, the comic adapted a couple traits from the game, notably the titular Darkness' ability to take control of its host whenever it wants.
  • As the Scott Pilgrim film (Scott Pilgrim vs. The World) had been in development since the release of Volume 1 (of 6), elements from the script (and interactions with screenwriters Edgar Wright and Michael Bacall) were incorporated by creator Bryan Lee O'Malley into subsequent volumes, per his own confessions. Much of Volume 6 was written during and directly after filming of the movie adaptation, meaning Jason Schwartzmann's portrayal of Gideon had been filmed while O'Malley's conception of the character was in flux, thus influencing the character's depiction in the graphic novel. Furthermore, some shots originating in the film's climax (the elevator with a downward arrow indicating its direction; the overhead angle of Scott dead on the floor) were directly incorporated into Volume 6. O'Malley has also stated that certain gags (such as the lines "It was just a [bisexual] phase," "You had a sexy phase!?") originated in the film's screenplay and were adapted into the graphic novels with permission, and that certain scenes were inspired by trips O'Malley took around Toronto with Wright and Bacall (such as the Honest Ed's sequence from Volume 3, which apparently came from Wright and Bacall's genuine shock and confusion once they entered the store, and horror upon seeing a particularly grotesque wall-mounted deer-head clock).
  • Sabrina the Teenage Witch:
    • Aunt Hilda and Aunt Zelda were an old crone and a chubby green-haired woman, respectively. Around the time of the TV show, they were changed into attractive middle-aged women.
    • A major change was Salem. He was originally a normal, non-talking orange cat until the TV show. Now he's a black cat who used to be a human.
  • The Spawn comics changed the title character's origin so that he was killed by Jessica Priest rather than Chapel from Youngblood. This concept originated in the movie, and was made canonical after Rob Liefeld left Image Comics (and took Chapel with him).
  • Archie Andrews being a musician is a popular part of his character, but it originally appeared in The Archie Show before being transferred into Archie Comics.

    Film 

    Literature 
  • J. K. Rowling mentioned in an interview that after she saw the first Harry Potter, her own mental image of Snape changed to resemble Alan Rickman, which would then affect the way he's described in the later books. This applied to the chapter illustrations in the American versions as well. Prisoner of Azkaban and Order of the Phoenix had portraits of Snape as balding and with a goatee, but Half-Blood Prince showed him with long black hair and no facial hair, just like in the movies.
    • In a smaller example the the sixth book mentiones an incident from three books earlier when Hermione punched Malfoy, even though she only punched him in the movie, in the book she slapped him.
  • Similarly, both Colin Dexter (Inspector Morse) and Ruth Rendell (Inspector Wexford) have said their mental images of their detectives were dramatically affected by the TV adaptations.
    • Reprints of the novels changed Morse's car from a Lancia to the Jaguar he drove in the TV show.
  • Thomas Harris has been quoted as saying this is exactly why he never watched the movie adaptation of his novel The Silence of the Lambs; not because he disapproved of it, but because he didn't want Anthony Hopkins' portrayal of Hannibal Lecter shading the character's portrayal in the sequels.
  • This is also Terry Pratchett's official reason for not reading Discworld Fan Fiction, along with the legal ramifications that can come with an unintentional (or coincidental) Ret Canon.
  • In the same vein, John le Carré stopped writing the novels built around George Smiley and the Circus in the early 1980s since, after several wildly popular TV adaptations, he kept seeing Alec Guinness when he wrote the character.
  • In the early Sharpe novels, Sharpe is a Londoner. Following the TV series, later books reveal he fled to Yorkshire as a teenager, where he presumably picked up Sean Bean's accent.
  • After Dr. No was released and made ridiculous amounts of money for all involved, Ian Fleming gave James Bond Scottish ancestry (rather ironic, considering he considered Sean Connery a bad choice for the role at first).
  • In Craig Thomas' novel Firefox, the titular fighter craft was originally nothing more than a MiG-25 Foxbat augmented with state of the art technology. After Clint Eastwood's 1982 movie adaptation came out with its iconic superfighter design, subsequent republishing of the novel would use the movie version of the Firefox to depict the craft. In addition, Thomas changed the description of the plane in the sequel novel Firefox Down to match the new appearance.
    • The Firefox (both the plane and movie plot) is actually an Expy of the 'MiG-242' from an episode of Gerry Anderson's puppet series 'Joe 90'.
  • The original novel of House Of Cards ends with Francis Urquhart's death. This was changed in the TV adaptation, enabling sequels. The two sequels to the novel (both adapted for TV later) are based on the TV ending. Also, Urquhart's wife in the first book is named Miranda and is not a co-conspirator. The sequels have an Elizabeth based on the TV character. (Oddly, the 2013 rewrite of the novel, while using the TV ending, changes Miranda's name to Mortima for some reason.)
  • Arthur C. Clarke's 2001: A Space Odyssey originally had the mission going to Saturn. It was changed in the films as they couldn't get the rings right, and that change crept into all subsequent adaptations. (This is a bit of a sidewise example, though. The movie is not an adaptation of the novel, nor vice versa— they were developed in parallel.)
  • At the end of the novel Jurassic Park, Ian Malcolm dies. He survives in the movie, and in the sequel to the book he is the protagonist. On the flip side, several characters who survived in the book but were killed in the movie adaptation are mentioned in The Lost World (1995) book sequel as having died from assorted natural causes some time after escaping the island. The only major exception to this is Hammond, who stayed dead in the books and alive in the movies.
    • Robert Muldoon is about the only character who survived in the book and died in the movie without being killed off. He doesn't make an appearance (or is even mentioned aside from namedropping of all the survivors) in the sequel, though.
  • Other than the basic premise of "cartoon characters are real and live side-by-side with humans" and four important characters (Eddie Valiant, Roger and Jessica Rabbit, and Baby Herman), there are almost no similarities between the book Who Censored Roger Rabbit? and the movie Who Framed Roger Rabbit. However, the author liked the movie much more than he'd liked his own novel (and recognized that the movie was much more popular and would thus more likely be in readers' minds), and when he wrote a sequel, Who Plugged Roger Rabbit?, he followed up the movie's continuity, not the book's (which was even handwaved away as being All Just a Dream). About the only things carried forward from the first book into the sequels that weren't from the movie were the concept of Toons talking in comic-strip speech bubbles... and Roger's height.
  • Martin Caidin's Marooned featured a Project Mercury mission. Later editions matched up with the movie and featured a Apollo-style spacecraft.
  • The original "Snow White and the Seven Dwarfs" fairy tale does not have her being awakened by a kiss; that was an addition by Disney. Instead, the apple was dislodged from Snow White's throat when the prince's servants dropped the glass coffin. It's rare to see a "Snow White" adaption that doesn't include it now, even ones that attempt to go back to The Brothers Grimm story.
  • While Roald Dahl ultimately disowned the first movie adaptation of Charlie and the Chocolate Factory (which he wrote the original script for, but it was substantially rewritten by David Seltzer), he did work the phrase "Strike that, reverse it" into Willy Wonka's dialogue in the book's sequel Charlie and the Great Glass Elevator. The phrase becomes a recurring one in the 2013 stage musical adaptation of Factory in a sort of merging of this trope and Internal Homage.
  • The novelisation of the Doctor Who story "Shada", written long after the new series was underway, ports various elements from the new series back into an Adaptation Expansion of a Tom Baker story. For instance, the novel restructures everything around a rather new-series-like romance between Chris and Clare, who were mere Implied Love Interests in the original, and other romantic and sexual elements are added (Skagra's behaviour towards Romana in the book is clearly because he has a crush on her, and the Doctor talks a Sapient Ship who falls in love with him into having The Immodest Orgasm - something he definitely would not have been allowed to do in the 70s). There is a reference to the Corsair, a Gender Bender character mentioned by the Eleventh Doctor, and Skagra and the Ship gain a lot of ironic Classic Who Fan Dumb traits in an affectionate Take That, Audience! sort of fashion, when the show at that time was not that self-aware. The Victim of the Week is also characterised in a new-series-like, Russell T. Davies-Pastiche way as a socially awkward gay man struggling with his own ordinary family life with his mother before the villain unexpectedly steals his brain.
  • The Type One vampires seen in The Dark Tower are specifically based on the redesign of Kurt Barlow from the 1979 live-action 'Salem's Lot mini-series.

    Live-Action TV 
  • Power Rangers and Super Sentai:
  • As of Series IV of Red Dwarf, Lister's backstory with Kochanski was retconned to one closer to what appeared in the novel Red Dwarf: Infinity Welcomes Careful Drivers than had been detailed in the first two series. Originally he'd been hopelessly in love with her, but never had the nerve to ask her out ("In your entire life, your conversations with her totalled 123 words. You had a better relationship with your rubber plant"); in the books they dated for a while, then she got back with "Tim, or Tom, or it may have been Tony" from Catering. The breakup first gets mentioned on screen in the Season IV episode "DNA", and Tim is referenced in Season VII's "Ouroboros" and Season VIII's "Krytie TV".
    • One episode of that series was adapted from a section of a novel, rather than the other way around: the episode "White Hole" is based on the "Garbage World" section of the novel "Better Than Life".
    • Also in "Ouroboros", Kryten says he always ends up alone, like on the Nova 5 and Lister responds "You killed the crew! All right, it was an accident, but still..." This refers to Kryten's expanded backstory in Infinity Welcomes Careful Drivers, where the Nova 5 crashed because he decided to clean the navigation computer with soapy water.
  • Smallville introduced an Expy of the Green Arrow foe Merlyn known as Vordigan the Dark Archer. When Merlyn was brought into Arrow, Malcolm Merlyn became his real name (his real name in the comics is Arthur King), while his codename was changed to the Dark Archer.
  • Kato in The Green Hornet is now always a martial artist.
  • Doctor Who sometimes incorporated elements from the Dalek comic books and annuals, as well as the Amicus Dr Who movies. The Emperor Dalek from "The Evil of the Daleks" is a Canon Immigrant from The Dalek Book, from which the word "rels" in New Who also originates. "The Parting of the Ways" uses Dalek spaceships modelled after the comic book ones, and even shows a Dalek with a movie-style claw attachment in place of a plunger at one point (although it is a flamethrower).

    Music 
  • After UB40 hit the top of the charts with a reworked reggae version of Neil Diamond's "Red Red Wine", Diamond began performing their version of the song in concert.
    • UB40's version was based on Tony Tribe's 1971 reggae reworking of the song, but evidently that hadn't been popular enough to justify Diamond changing his arrangement.
  • Johnny Cash's version of Nine Inch Nails' Hurt. Trent Reznor himself even said:
    It feels like I've just lost a girlfriend, because that song isn't mine anymore.
  • Bob Dylan in concert tends to perform Jimi Hendrix's cover of his song "All Along the Watchtower".
  • Billy Joel likes Garth Brooks' version of Shameless so much that he lets Garth come out and sing it when he gives a concert.
  • Noel Gallagher of Oasis went through a phase of doing Ryan Adams' cover of "Wonderwall", most notably on his solo and acoustic tours.
  • Suicidal Tendencies brought in significant funk influences from their side project, Infectious Grooves.
  • Robert Smith, singer and guitarist for The Cure, enjoyed Dinosaur Jr.'s cover of "Just Like Heaven" so much that it has drastically influenced the way that The Cure play the song in concerts.
  • Humorous example: After "Weird Al" Yankovic parodied Madonna's "Like a Virgin" music video with his own "Like a Surgeon", Madonna appeared in a second video dressed as a surgeon.

    Tabletop Games 
  • Warhammer 40,000:
    • The game didn't even have two-handed Thunder Hammers before Dawn of War gave one to its Force Commander.
      • Technically the Thunder Hammer is not a two-handed weapon, you just can't get a bonus attack unless you have a pair (or in 6th edition, a Thunder Hammer and a Powerfist/Lightning Claw), which no official model has. However, it was not available for a power armoured character until the 5th edition Space Marine codex, which came out after Dawn of War.
    • The Tau Railrifle was first introduced in the Fire Warrior game, and was given rules as a White Dwarf supplement before being added to the next codex.

    Theatre 
  • Revivals of a musical with a successful movie version will often try to find places to add songs written for the movie back into the show. E.g. Cabaret, The Sound of Music, Grease.
    • Additionally, some stagings of Grease will use T-Birds as the name of the boys' gang.
  • Revivals of Anything Goes invariably include "It's De-Lovely," "Friendship" and other Cole Porter songs originally written for other shows.
  • The licensed version of The Wizard of Oz as a stage musical still has those damn ruby slippers, while the originals were silver.

    Theme Parks 
  • After the Pirates of the Caribbean movies became popular, references to the characters were added to the original Disney World ride, along with several animatronic appearances of Captain Jack Sparrow. The latter are particularly jarring, as all of the original characters are cartoony caricatures of human beings, but Jack is a perfect likeness of Johnny Depp's character (although Depp himself may be sufficiently cartoony to justify this).
    • More jarring is the sound. Jack Sparrow and redone sound clips mentioning him sound very clear, while any audio still from the original version of the attraction is far scratchier.

    Video Games 
  • It's safe to say that the first Mortal Kombat movie has practically influenced any game made after it. The main changes:
    • Kano was originally American raised in Japan, but after the first film, Trevor Goddard's Australian interpretation was sufficiently well received for him to become an Aussie in the games. Ironically, Goddard was actually a Londoner who spent his entire life acting as an Australian in order to fill a gap in the Hollywood market. Sadly, Goddard passed away from a bad drug overdose in 2003 and Kano was officially made Australian from then on, in his honor.
    • The importance of winning ten tournaments, as lampshaded by Shang Tsung at the beginning of MK9's Story Mode.
    • Kitana as Liu Kang's Love Interest, lampshaded in both Shaolin Monks and 9.
    • Johnny Cage and Goro's rivalry, as well as references to their fight. Particularly in Mortal Kombat X, where Johnny gets to comment on how Goro still has a vulnerable spot and that the big fellow owes him a pair of $500 sunglasses.
    • The Ship Tease between Johnny and Sonya (assumed to be canonical on most fans' part anyway), albeit in the form of Belligerent Sexual Tension (at first, anyway; Sonya mellows out a bit towards Johnny over time). In Mortal Kombat X, we learn that they eventually have a daughter together, named Cassie.
    • Raiden being heavily influenced by Christopher Lambert's portrayal in the movies, specifically his long white hair, his dry sense of humor, his status as BigGood/MentorArchetype (the very first MK game portrayed him as simply a vengeful god opposed to Shang Tsung), and the fact that he is forbidden from directly interfering in the tournament.
  • Kirby:
    • The platformer Kirby: Squeak Squad redesigned Dedede's palace to resemble the one from the anime adaptation. The room where Kirby fought Dedede even contained the monster summoning device from the series.
    • Similarly, Kirby: Nightmare in Dream Land, the GBA remake of Kirby's Adventure features the Fountain of Dreams from Super Smash Bros. Melee, complete with its remixed stage music.
    • Super Star Ultra and Mass Attack started giving attention to Sword and Blade as Meta Knight's followers, most likely because they were in the anime (where Axe, Mace, Trident, and Javelin were nowhere to be seen). Also, in Super Star Ultra, the Halberd was redesigned to resemble its Brawl appearance.
    • Kirby's Catch-Phrase "poyo!" and Dedede's Verbal Tic "zoi" are both originally from the anime, as is Meta Knight's habit of wrapping his cape around himself.
    • Escargo(o)n, Customer Service, and Macho-San/Max Flexer appear in different extra mini-games in Kirby Mass Attack.
    • Kirby: Planet Robobot allows Meta Knight to use Galaxia Darkness, his Final Smash in the Super Smash Bros. series, as an attack.
  • On the subject of Smash Bros., that game influenced how Captain Falcon was portrayed; all of his appearances after the SSB games now have him with all of his Smash Bros. moves intact. It overlaps with Ascended Meme as well. In F-Zero GX, the song that played during the credits reel when you completed Story Mode mentioned the Falcon Punch, hinting that it was one of his canonical abilities (his other SSB moves are left up in the air). In Falcon Densetsu/GP Legend, Falcon gets to finally show his moves during the Grand Finale and goes out in a blaze of glory.
  • Pokémon. Red and Blue versions didn't take the anime into account. Later versions do. It shows:
    • Pokemon Yellow is Red and Blue altered to match the anime. Pikachu is the starter, Jessie and James appear regularly, the Pokemon designs reflect their TV appearances (rather than the Off-Model, Nightmare Fuel-inducing original sprites), and the main Team Rocket mons are uncatchable (because Ash would never catch 'em). Surprisingly, one of the uncatchable mons is Weedle, which Ash attempted to catch in the anime. Brock mentions his wanting to be a breeder in Yellow as well. The nurse sprite was altered to match Nurse Joy. Misty obtains Togepi in the anime. Misty has a Togetic in the games. Togepi evolves in the anime.
    • In the canonical games, come Pokémon Gold and Silver Misty has some minor tsundere and Hot-Blooded qualities that she lacked in the original.
    • As of Pokémon X and Y, Pikachu's cry uses its voice from the anime.
    • The games have been using Wingdinglish instead of a 'real world' language since at least the fifth gen. This originated in the anime (and was originally an invention of 4kids trying to censor everything Japanese).
    • The games usually avoid referencing adaptations besides the anime. However in Omega Ruby and Alpha Sapphire, a picture of Archie, Shelly, and Jirachi exists. In the Emerald chapter of Adventures, Archie tried to capture Jirachi.
  • Silent Hill: Homecoming takes many of its visual cues from the film adaptation (which the fans HATE). This is one of the reasons why it's considered the scrappy of the franchise.
  • Sonic the Hedgehog:
    • Sonic's love of chili dogs featured in DiC's animated adaptations didn't come from any of the games, but it eventually made its way into Sonic Unleashed (though the Japanese manual to a Sonic Advance game mentioned it), which features numerous food items Sonic can obtain, including chili dogs, described as his favorite. It was also used in Sonic Chronicles and used awesomely in the intro to Sonic and the Black Knight.
    • Also, Shadow taking off his rings for an energy boost came from Sonic X, but has since appeared in Sonic 2006.
    • In addition to that, Sonic Chronicles features the SWATbots from the old Sonic cartoon as enemies.
    • The OVAs changed Knuckles the Echidna into a treasure hunter. Half a decade later, Sonic Adventure 2 made references to Knuckles being a treasure hunter. Though this may be more of a nod than anything, likely referencing the fact that he's always searching for emeralds in these games (for the purpose of restoring the Master Emerald).
    • Outside of Japan, Dr. Eggman was known as Dr. Ivo Robotnik. Then Sonic Adventure 2 gave his grandfather the surname Robotnik in every region. Though contrary to popular belief, it still hasn't been established to be part of Eggman's name in Japan.
    • In the games, Dr. Eggman, while having his robotic minions, didn't have any close sidekicks; compare this to any of the animated series and comics, where his counterpart has some sort of underling (Grimer in Sonic the Comic; Scratch, Grounder and Coconuts in Adventures of Sonic the Hedgehog; Snively in Sonic the Hedgehog; Sleet and Dingo in Sonic Underground; Bocoe, Decoe and Bokkun in Sonic X). This changed in Sonic Unleashed, which gave him SA-55 "Orbot" as a snarky direct underling, and then furthered in Sonic Colors with "Cubot", giving Orbot somebody else to play off of for humor.
    • Sonic Unleashed and later games seem to borrow a bit from the American cartoons. Namely their more westernized tone and style, as well as Sonic and Eggman's characterizations, such as the former having a hyper personality. Before that, he was usually depicted with a more calm and cool personality.
    • Amy and Knuckles' personalities were altered to match their Sonic X interpretation after the success of the anime. For example, Amy became brattier and even more love-struck than she was in the Adventure games, while the previously serious and stoic Knuckles was changed into a quick-tempered Butt-Monkey and became more gullible.
  • Super Mario Bros.:
    • The idea of pairing Luigi and Daisy might be the only plot element from the 1993 Super Mario Bros. movie that was actually adapted into the video games (Though "Mario Mario" and "Luigi Mario" has popped up in Nintendo of America made media, despite Word of God saying they lack surnames). In her debut in Super Mario Land, Daisy was simply a Peach expy for that game and it wasn't until the later Mario Party and Sports games that the idea of having her as Luigi's love interest came about. Miyamoto then reconfirmed that the bothers' full names are indeed "Mario Mario" and "Luigi Mario"
    • Additionally, Luigi's cowardice originally was introduced in the cartoon spinoff The Super Mario Bros. Super Show, though an Atari commercial for Mario Bros. used it earlier.
    • Super Mario Maker made the brothers natives of Brooklyn via an official course by Coursebot, in part with the American media stating that they are from Flatbush.
  • Many elements from the various media adaptations of the Street Fighter franchise ended up being used in the backstories of later games. Most notably, Street Fighter II: The Animated Movie greatly influenced the plot of the Street Fighter Alpha prequel series, from M. Bison's more muscular design to the origin story of Ryu's red headband. Ken's brainwashed "Violent Ken" form from the animated movie also became playable in SNK vs. Capcom: SVC Chaos and Ultra Street Fighter II. Masahiko Nakahira's manga adaptation of the first Alpha game featured a storyline involving Ryu being possessed by the Satsui no Hadou, the same power used by Akuma; this concept would be reused for Ryu's storyline in Alpha 2.
    • Evil Ryu having a burning hole in his chest in Street Fighter IV is taken from Masahiko Nakahira's Street Fighter III: Ryu Final manga, where Ryu impaled himself on Akuma's fist in order to avoid his Shun Goku Satsu.
    • Ryu Final also had Elena communicating with Ryu via a sacred tree in her native Kenya. The sacred tree in question is mentioned in Elena and Dudley's prologue in Street Fighter X Tekken.
    • While the real reason may be simple convenience for the artists of the scene, Guile's intro in Street Fighter IV shows him holding Charlie's dog tags, on which the name "Charlie Nash" is written ('Charlie' is his name in western territories, while 'Nash' is his name in Japan). While the true use of this probably is to avert having to redraw the scene for Japanese audiences, the name 'Charlie Nash' is a common Fanon name as well as the name given to Charlie in UDON's comic book series (which is how it fits into this trope).
    • Maki from Final Fight 2 originally sported a different outfit, but was redesigned for the Sakura Ganbaru! manga series. Elements of Maki's manga design (namely the use of a tonfa as her personal weapon) were incorporated into her new design for Capcom Vs. SNK 2, and later Street Fighter Alpha 3.
    • Speaking of which, Sakura Ganbaru! ended with a Distant Finale showing a now-adult Sakura working as a gym teacher. Sakura's Street Fighter IV ending similarly depicts an adult Sakura reuniting with Ryu several years after the events of the game, and she's now shown wearing her gym teacher outfit from the manga.
    • Ryu's Metsu Hadouken also originated as Evil Ryu's Level 3 Super in Capcom vs. SNK 2.
    • Aspects of Cammy's backstory from the Alpha series, such as her codename Killer Bee, were also based on elements that originally appeared in Masaomi Kanzaki's Cammy Gaiden manga.
    • The idea that Decapre has her face burned on the left side comes from the UDON comics series.
    • In the Street Fighter Legends: Ibuki mini-series, Sarai is eventually allowed to begin ninja training after becoming sad over her Muggle Best Friend status. This plot point was canonized in Ibuki's Super Street Fighter IV ending, with Sarai shown in the same ninja training class as Ibuki. She can even be seen wearing her ninja garb in a cameo in Street Fighter X Tekken.
    • For years, Chun-Li's deceased father had no name in the game's canon. When Capcom finally named him around the time of Street Fighter V, they went with "Dorai," his name from the Street Fighter II V anime.
  • Elements of Wolfgang Krauser's backstory (such as being Geese Howard's half-brother and having killed their father when he was a teenager) were introduced in the second Fatal Fury anime special, and later became canon in the subsequent games.
  • The Worlds of Power series of children's books based on NES games ended up affecting two games' sequels.
    • "Kal Torlin", which was the name of the land where Shadowgate took place, was first used in Before Shadowgate and ended up used in Shadowgate 64.
    • Eve, the young woman Jason falls in love with in the novelization of Blaster Master, ends up being his wife in the sequel Blaster Master: Blasting Again for the PlayStation. The author of the book was surprised to find out that his character had become canonical. She even shows up in the Continuity Reboot Blaster Master Zero alongside Jason; as a bonus, his English name is now his canon name in both English and Japanese.
  • Updated Re-release Fire Emblem: New Mystery of the Emblem several details that were simply Word of God, such as Ogma being a former gladiator, and made them part of the characters' official backstories through its support conversations. There's also a Downloadable Content map which centers around a duel between Ogma and Navarre similar to the second episode of the short-lived anime.
  • Starting with the second game, the anime has had an influence on the Yo-kai Watch games. For example Jibanyan (who is a main character in the anime and the franchise's mascot) was made into an Ascended Extra while Katie (the female protagonist) was Demoted to Extra in exchange for Inaho (a female character who has a Yokai Watch in the anime).

    Western Animation 
  • Transformers:
    • Transformers Animated has a group called the Cybertron Elite Guard serving as the commanding military and security force for the Autobots. Then, the BotCon 2009 theme was about a similar group (with the same winged Autobot insignias) set in G1 continuity called the Cybertronian Elite Guard. The Elite Guard are also in Prime, with Smokescreen having once been a member.
    • In another Transformers example, the Beast Wars toyline originally portrayed the events as taking place on present day Earth and Optimus Primal and Megatron being merely new forms of Optimus Prime and the original Megatron. When the animated series premiered with the events taking place on prehistoric Earth via time travel and Primal and Beast Megatron being made legacy characters, the toyline was changed to match up with the cartoon.
    • Transformers Prime shows heavy influence from the Transformers series including the general appearance of Optimus Prime, Bumblebee and Megatron, as well as Bumblebee's muteness (although he now speaks in generic beeps and tones instead of talking using clips from his radio). Many fans have described the aesthetics of the robots as a mix of Movie-style and Animated-style.
    • The War for Cybertron game was effectively a G1 prequel, stated to be in the same universe as the Prime series by the toy company despite the existence of Dark Energon being the only thing the two stories had in common. However, the sequel, Fall of Cybertron, is upping the similarities to Prime with Cliffjumper's head design changing from a G1-inspired design to a clearly Prime-inspired on as well as Bumblebee having his voice box destroyed by Megatron, muting him in the same way as in the Films and Prime. Prime has also had a few nods to the games. Both versions have left their marks on each other to the point that they've sorta converged.
    • Prime also follows in the footsteps of Exodus lately, incorporating bits from across franchise history. Four key macguffins that go into an "Omega Lock"?
    • Beast Wars introduced the concept of a robot soul called a Spark, all subsequent material have included this as a major component of the Transformer culture. This was even retroactively applied to all G1 characters, with the original Optimus Prime and Megatron having particularly powerful sparks able to upgrade the forms of Optimus Primal and Beast Wars Megatron.
      • An earlier concept of this was hinted at in Generation One, when two episodes referred to a "laser core." Once, the 'cons wanted to make sure Prime's was extinguished rather than assuming he was dead due to the damage he'd taken earlier; another time, Megs ordered Devastator to extiquish the Autobots' laser cores forever. This was very spark-esque (something in your chest that, if "extinguished," means you're dead-dead and not cartoon dead, and checking for this is the only way to be sure) and may have been in the back of the Beast Wars writers' minds. However, there's no clear indication that they were aware of it when they conceived of the 'Spark' concept, and it was mentioned on those two occasions only.
    • They also introduced Protoforms, though what they are can vary from the equivalent young, infant, or even prenatal Cybertronians, to simply a Cybertronians' basic form. (The movie toy packaging stands alone in using "Protoform" to mean "Cybertronian who hasn't scanned an Earth mode yet," which would make the entire casts of The War Within or War for Cybertron protoforms.) Not every series included them, but a lot did.
    • IDW Publishing's Transformers series begins life as an updated retelling of G1, but bits of other versions begin to sneak in. These days, not using things like the units of time (cycle, megacycle, etc.) and what we know of Transformer biology (sparks, etc.) that Beast Wars originated is unheard of. Also, by now, we've met Lockdown (Animated-original) and Grindcore (Movie comics original), quite a few characters from the Japan-only G1 sequels, and Omega Supreme uses his name as a Badass Boast (Animated Omega was the first to do that.)
      • To make a long story short, once any Transformers property introduces a character or concept, it becomes fair game for both new series and new versions of older series. In The Multiverse, one Demolishor or Barricade or Omega Lock existing means that every universe probably has one that you just haven't met... yet.
  • The chapter books and comics based on My Little Pony: Friendship Is Magic were initially considered Loose Canon. With Hasbro's official position that if something happened in the official comics, the official chapter books, or even in Equestria Girls and its sequels, it's canonical unless outright contradicted by the series itself. Despite the fact that no episodes prior to Season 5 (save for at least one episode) make outright references to either. Several episodes in Season 5, however, either explicitly reference or allude to events in the books, largely due to the books' main writer joining the show's writing stable.

http://tvtropes.org/pmwiki/pmwiki.php/Main/Retcanon