"Oh, I figured everyone got blasted back to their own worlds. They probably don't remember it at all because of all the time-travel wibbley-wobbley. But you can't mess with the gooey essence of everything like that without changes happening, y'know? I bet there's still Genesis Portals out there! And there's probably even more worlds to explore! And I bet'cha at the middle of it all is some sort of nexus!"An example of a Retcon caused by forces within the story itself, usually using Time Travel of some sort to alter history. Rarely is it used purely as a dramatic device; the real function is to paper over continuity gaps and mistakes. For example, let's say that the author of a novel series was dissatisfied at the way she'd killed off a character in an earlier book. Instead of just having him show up and explain that he was Only Mostly Dead, she has the other characters pulled back in time by an evil plan of the Big Bad; in the process, they manage to prevent the events that lead to the death of the character, and when they get back, ta-da! There he is, good as new. Whether or not characters will remember the pre-retconned state depends on the story. Often (especially lately), Cosmic Retconning is the go-to method for demolishing Continuity Lock-Out and drawing in a younger audience. As a rule of thumb, superhero movies are the hottest way to increase readership; thus, the new canon should conform to whatever is playing in theaters or on television. See also Ret Canon. A potential downside to this trope, of course, is that it can invoke a strong sense of Shoot the Shaggy Dog on previous stories in the franchise. Moreover, if the old versions of the characters see the end coming for their world and realize that, at best, they can only save the universe by drastically changing it (perhaps erasing countless people from existence and rewriting the personalities of the survivors), the results can be pure Nightmare Fuel — and also possibly a source of severe Mood Whiplash if either the outgoing or incoming universe is notably more "carefree and innocent" than the other. Note that this applies only to actual retcons; something like Back to the Future, where changing the past is part of the original plot, doesn't count. Retconjuration is the ability of a character to do this, usually only found in the hands of Reality Warpers and their ilk.
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Anime and Manga
- Transformers, of course, has one of its own: the Unicron Singularity, which ripped and tore at the fabric of time and space in a way that essentially opens up a planet-sized plot hole just to make room for itself to fill it.
- The Unicron Singularity didn't exist as this at first, and it was transformed into one by the club comic writers to account for some (admittedly minor) inconsistencies between Transformers Energon and Transformers Cybertron. Mind you, these are only minor in comparison to the humongous plot holes that already populated the rest of the entire Transformers multiverse, which did not have such a black hole, though later media claims that its effects branch out to other universes as well, ergo it is both the cause of and solution to many errors in continuity (and even animation).
- There actually exists a Transformer, Vector Prime, who was tasked by Primus to protect the stability of the timeline - in other words, the number of plot holes in Transformers is so bad, it is actually an in-universe threat, and there needs to be someone to keep the holes and inconsistencies from destroying everything. He does his best to fix things (usually retconning them from outside the timeline to cover inconsistencies, but coming in person for tremendous holes like the Singularity) so presumably any inconsistency we see was simply recorded before he got around to it, and our media are ripple effect proof.
- The concept of the multiversal singularity (that is, characters of which only one exists in the entire multiverse, such as Primus, Unicron and The Fallen) was nullified by this - while at first it was gradual, with Ask Vector Prime claiming certain appearances of Unicron (such as the one in the original American cartoon continuity) were not part of the main singularity Unicron, the 2015 Fun Publications story "Another Light" had Nexus Prime solidify the walls between reality, limiting travel between dimensions and splintering all former singularities (such as Vector Prime and Nexus himself) into infinite selves across existence, as had been the case with many "regular" beings.
- Played for laughs in Excel Saga, where the Great Will of the Macrocosm has to reset the plot multiple times per episode.
- Done several times throughout the backstory of ×××HOLiC and Tsubasa Reservoir Chronicle. You'd need a diagram drawn by M. C. Escher in seven dimensions to figure out the order of which retcon came before which, though. Altogether, they produced several clones, eliminated the royalty of a kingdom as royalty while leaving their children the prince and princess in place (their ancestor from another dimension had to come in to act as a placeholder and keep causality intact), caused reality to not notice that someone had died for several hundred years, at which point it had always noticed (except for the aforementioned clones and friends), and both added and removed the main character's parents from existence (their existence in-story predated the retcon somehow, and the protagonist managed to survive his parents ceasing to have ever existed via a Deal with the Devil).
- Stone Ocean, the sixth story arc of JoJo's Bizarre Adventure, ends with the antagonist Enrico Pucci recreating the universe. The next story arc, Steel Ball Run, is a Continuity Reboot that takes place in the same time period as the first story arc, Phantom Blood.
- At the very end of the Neon Genesis Evangelion manga, Shinji rejects Instrumentality and causes the Reset Button to be hit. The final chapter takes place in the rebooted timeline, where the Earth is safe, Second Impact never occurred, and the Angels never appeared on Earth.
- In the final arc of The World God Only Knows, we learn that Elsea is, in fact, the Ultimate Weiss, the superweapon the Big Bads have been after all along. As a result, Elsea is a great deal more powerful than anyone, even herself, realized and once the dust from the final battle settles, uses her power to allow herself to be reborn as Eri Katsuragi, Keima's little sister.
- In the Pokémon Chronicles episode "Celebi and Joy", shortly after entering a big city, Ritchie is sent back 75 years in the past and prevents a boy from being killed in an accident. After Ritchie returns to the present, it's shown that the once-boy is now the mayor of the city, which is now an idealic valley town.
- Happens again in the anime proper in "Time Warp Heals All Wounds", where after learning about an old woman's husband who died in an accident after leaving town, May and Meowth are sent back into the past when said husband is still alive and prevent him from taking the train to the city where he would eventually die. As a result, the husband is still alive and is a Pokémon Egg Doctor in town who assists May when her Egg hatches into an Eevee.
- And it happens once more in Pokémon: Arceus and the Jewel of Life, where Ash, Brock, and Dawn are sent back thousands of years in time to prevent the event that made Arceus distrustful of humans and want to pass judgment on them. They succeed although they have to remind Arceus in the present what they did after returning there. It's also revealed that there is now a ancient picture in the present depicting Ash and co. having helped save Arceus.
- In the final episode of Puella Magi Madoka Magica, Madoka wishes for the power to erase all Witches that have ever existed or could possibly exist before they're born, which results in her ascending to become the embodiment of hope for all Magical Girls. Her wish ends up creating a new world where the Witches and Madoka Kaname herself never existed, Mami and Kyoko are still alive, Magical Girls fight creatures called Wraiths, a "Law of Cycles" is in place that causes Magical Girls who cross the Despair Event Horizon to disappear, and Homura now uses a bow and arrow in honor of her best friend.
- The DCU has done this several times, starting with Crisis on Infinite Earths. Usually, it's part of a larger effort to make the characters more accessible and marketable. Usually, it fails.
- Crisis on Infinite Earths did it to the entire DC Universe - the destruction of The Multiverse damaged the time-stream, changing the histories of many characters who lived on the only surviving Earth, thus removing their pre-Crisis backstories (and their campiest adventures.) Several survivors of other Earths have been rewritten into the new history. (For several years this failed to work properly with Power Girl, and she shifted between several conflicting origins until the universe found a way to slot her in properly. Or rather, that was the in-universe explanation for her Multiple-Choice Past.)
- Zero Hour!: Crisis in Time, the first sequel to Crisis on Infinite Earths, was the second universe-wide retcon, caused by Hal Jordan and Hank Hall going mad and tampering with the timestream. It created the sliding timescale that the DCU has used since and altered the backstories of several characters, most notably Hawkman and the Legion of Super-Heroes.
- In Infinite Crisis, CoIE's second sequel, a group of survivors from the pre-Crisis multiverse try to separate the numerous Earths yet again, leading to the multiverse's retroactive re-creation. It also featured a second, separate cosmic retcon; see below. (The third sequel, Final Crisis, did not radically alter continuity.)
- The picture at the top of the page came from Infinite Crisis. Many of the changes here were caused by Superboy-Prime pounding on the walls of reality, giving rise to the "Superboy Punch!" meme as a way of hand-waving continuity errors.
- Flashpoint, building off The Flash: Rebirth mentioned below, boils down to simply a time-traveller mucking things up and the heroes having to fix it. When The Flash makes the fixes, Pandora steps in and uses him to merge the Vertigo Comics and WildStorm continuities with the main DCU to create a single timeline, saying the three had originally been one timeline splintered long ago. It seems to be this merging, not a case of incorrectly repairing history, that causes the retcons.
- Convergence #8 causes the events of Crisis on Infinite Earths to be rewritten, so the pre-Crisis multiverse comes back with the addition of the worlds added post-Infinite Crisis. However, this doesn't rewrite any of the universes' continuities, and they keep going as they were beforehand.
- Marvel uses it less often, usually preferring the more "subtle" Sliding Timescale. This usually prevents the all-at-once changes of a Cosmic Retcon by feeding changes out gradually over decades.
- Marvel had their own Superboy-Prime for a while in the form of Wanda Maximoff, the Scarlet Witch. When her powers shifted from "control of probability" to "able to reshape reality at will" and she went bugnuts crazy, "Wanda did it" became a very popular Hand Wave for a little while.
- One 2000s example of a Marvel Cosmic Retcon is the Spider-Man storyline One More Day.
- The creators of ElfQuest were forced to do this by Executive Meddling: basically, they lost the rights over a large group of characters, the Wavedancers, created as a spin-off by someone Running the Asylum. Because they did want to keep the overall story, a new group of Wavedancers was created in their place, and the original group was handwaved as a dream brought on by Big Bad Winnowill.
- In The Sandman, Delirium threatened at one point to turn Mazikeen into a "a demon half-face waitress night-club lady with a crush on your boss", and "make it so you've been that from the beginning of time to now and you'll never ever know if you were anything else and it will itch inside your head worse than little bugses". Given that Mazikeen already was a demon with only half a face working at a night-club, it's unclear if Delirium actually did make a Cosmic Retcon (with the original state never being seen by the reader), or if she was just being her usual Cloud Cuckoolander self.
- This is what happens if enough living creatures share the same dream. If a thousand cats were to dream of a world where they rule over humans then the universe would change so that it had always been that way. Luckily getting a thousand cats to agree to do the same thing is nigh impossible. Also, this is how humans came to rule the world.
- Alan Moore's Supreme run starts with the main character finding out that he is not the only Supreme - reality has been revisioned multiple times in history, and all his previous incarnations (be they alternate counterparts, imagined versions or "future" selves) together with all their supporting characters, end up in the Supremacy, a dimension which they turned into a utopia. Later we find out that his Arch-Enemy Darius Dax has a similar thing - all his previous versions go to a dimension called the Daxia.
- When characters from Milestone Comics and Archie Comics' Red Circle imprint started to popping up in the DC Universe, Word of God said that their worlds had been fused with DC's due to the events of Final Crisis.
- Youngblood: Judgment Day reveals that the Book of Hermes is capable of changing reality and Sentinel used it to not only rewrite his own life but also turn the whole world into one that he liked.
- Avengers Forever reveals that many events of the past have been staged by Immortus and Space Phantoms, cleaning up many Continuity Snarls.
- In The Flash: Rebirth, it is revealed that Barry Allen's mother is dead and his father, the only suspect, died in prison. For years Barry Allen was one of the few superheroes without a traumatic origin and his parents grew up and old without complication; it turns out it is because Barry's archenemy, the Reverse-Flash, went back in time, killed his mom, and framed his dad.
- J. Michael Straczynski's revamp of Wonder Woman has Diana not as the first woman to leave Themyscria and make her way in man's world, but as a survivor of a Themyscria that was sacked when she was a child and who is just now coming into her Amazon heritage. Other characters in the DCU (such as Max Lord) are stunned to find out that few people seem to remember Wonder Woman as she was. Diana's goal is to try setting things right. This revamp was a Gambit Pileup between the goddesses Nemesis and Clotho. Eventually Diana manages to set everything right, but her ordeal, likened to the Odyssea, was meant to introduce new changes into the status quo, like a revised outfit and an harder, no-nonsense attitude for Diana, though this too seems to have be retconned by the end of Flashpoint and into her new series. Wonder Woman's pants (and lack thereof) were the cause of so much drama that for several months they were in limbo, though by the time September 2011 rolled around she was again pantsless.
- In the Sonic The Hedgehog comics, this happens in the Mobius: X Years Later reality (which is separate from the main canon universe). Damage to the fabric of reality from previous adventures threatens to completely destroy the timeline, so Sonic goes back in time to fix it, which results in reality changing - before, Mobius was a Utopia ruled by King Sonic, where all the villains were either dead or at peace with the heroes. But after the changes, it becomes a totalitarian dictatorship ruled by King Shadow and enforced by his Secret Police. Fortunately, the heroes who remember the way things are supposed to be come together and defeat him, returning things to the way they're supposed to be (albeit still with the alternate history).
- There are also shades of this in Silver's stories; everytime he travels backwards in time, he causes small alterations to the timeline. Just not enough to undo the Bad Future he lives in.
- Dr. Eggman attempts to invoke this trope in the Sonic: Genesis storyline - hooking up a Chaos Emerald to the Death Egg II, he attempts to rewrite history so that Sonic never existed... and ends up creating the video game universe instead, though with the Freedom Fighters and Snively with them. Sonic is able to go Super and, in an attempt to save Sally due to the fact that she was killed before the first Retcon, resets the universe to its normal state. However, because of that one change, a number of things about Mobius itself is altered.
- Happens again in the Worlds Collide crossover with Mega Man, where Eggman and Dr. Wily recreate the Genesis Wave, this time affecting both their worlds. Though rather than trying to erase Sonic and Mega Man, they alter history so Mega Man is post-Mega Man 10 (allowing the use of Bass, Proto Man and Duo) and Sonic is in the modern video game setting rather than Archie's unique comic universe (for familiarity to non-Archie Sonic readers).
- In the final part of the story, Eggman screws up Sonic's Chaos Control, causing some major rewriting in his world that, so far, shuffles the current position of nearly everyone, integrates some game storylines into the Archie continuity, redesigns a number of characters, exiles characters created by Ken Penders (who are entangled in a lawsuit) and abruptly aborts the King Naugus and Mecha-Sally arcs.
- Doctor Strange has seen this happen a few times (being pals with Higher Beings will do this). In one storyline he saw the entire world destroyed and recreated except for himself, causing him some psychological distress as he wondered if the people he knew and loved were actually real.
- Digimon: Children of Time: As revealed in the first chapter of Children of the Present, after the events of Digimon Adventure 02, Gennai, insisting that The Masquerade still has to be maintained for a little while longer, not only erased the memories of everyone who wasn't a DigiDestined or a family member of the DigiDestined, but also somehow created the Digimon franchise as shown in Digimon Tamers.
- In Raven Child's The Smurfette Village fanfiction series, the events that take place in the fourth story "A Home Through Time" retcon The Smurfs' ninth season (the time-traveling episodes) out of existence, setting things up for the events that take place in the story series proper.
- In the Pony POV Series, the Shining Armor Arc ultimately reveals that General-Admiral Makarov is an Equinoid Abomination called the Shadow of Chernobull, which has twisted reality in order to maintain the Hooviet Empire, and set itself up to Take Over the World. When Shining ultimately defeats Makarov by feeding him to the Blank Wolf, all the changes to reality are undone, with the only ones remembering the Darker and Edgier timeline being Shining, Cadence, and Minuette (who, due to being Immune to Fate, a Concept, and a Time Lord, respectfully, have Ripple Effect-Proof Memory).
- In Draknophobia the White Dragon Sotrahkun is forced to do this when Alduin screw things up extremely badly. He'd created Tears through time that allowed him to summon alternate versions of himself but in the meanwhile breaking time as we know it. The Dragonborn, Petra is forced to sacrifice herself mend things in the end with the help of Brynjolf, sets the retcon in motion. as a result, only Brynjolf remembers the old timeline as Sotrahkun rewrites and actually merges timelines. But it's hinted that Petra will eventually recall everything that happpened, albeit at a different pace.
- The My Little Pony: Friendship Is Magic fanfic Make a Wish has a magic wishing star that grants every wish made on it. Many wishes are purely physical changes, but a few feature Cosmic Retcons on both large and small scale.
- On the small scale, Rainbow Dash wishes for a chance to meets the Wonderbolts, and finds herself having won a contest she never remembered entering. Yet everypony else remembers her doing so and even remarks that she visited the contest's office on a weekly basis to find out if she'd won.
- On the larger scale, Scootaloo makes the wish that she was Rainbow Dash's sister and wakes up the next day Rainbow's flesh-and-blood little sister. Like Rainbow and the contest, Scootaloo's the only one who remembers anything different in her case. The story focuses on her realizing what happened and dealing with the For Want of a Nail implications.
- The 2009 Star Trek movie has Nero traveling back in time and killing Kirk's father, radically changing the timeline, creating a brand new continuity.
- Oh, and blowing up Vulcan, and killing Spock's mom. Can't forget that!
- Actually averted, since J. J. Abrams himself stated that his movies take place in an alternate reality caused by events in the movie and that everything else in Star Trek canon is still intact.
- In the Mouth of Madness has some particularely mind-bending ones. The crux of the story is that horror writer Sutter Cane has become so powerful that his creations have become reality, and the protagonist John Trent finds himself in the fictional setting of his stories. By the time he gets back to the "real world" his partner Linda Styles has been written out by the writer (not even her boss, who sent them on their mission, can remember her), and Cane's reality-destroying novel was already delivered by Trent to the publishers and has been on the shelves for weeks, even though Trent just emerged from Hobb's End. The Cane that Trent encountered might also be an Author Avatar of the real Cane, who is writing the entire story of the movie (yes, the one you are watching), Cane might have been influenced by a monolith of Eldritch Abominations to change reality so they can transform it into something wholly alien, or Trent may be particularly insane.
- Japanese time-travel movie Time Slip Yankee shows what happens when you mess with your parents first meeting Back to the Future-style. The main character is snap-backed into a retconned timeline where his then girlfriend in now his mother after his parents fell for different people. Everything about his life is different, even his body.
- X-Men: Days of Future Past and X-Men: Apocalypse. The events of DoFP not only fix the Bad Future, but also alter the events of X2: X-Men United and X-Men: The Last Stand, preventing the death of Scott and Jean (who's still taken to wearing red). X-Men Origins: Wolverine also gets discontinued, not just its ending, but by showing that William Stryker is different and Logan's flashbacks to his adamantium bonding are those of the first two movies - not to mention what happens with Deadpool, who becomes the Merc with a Mouth instead of a zombified All Your Powers Combined mutant controlled by Stryker.
- There is still a scene from Origins in DoFP, and its events are alluded to. And Jean unleashes the Phoenix much earlier than she did in Last Stand, and she controls it to do good this time. Charles seemingly got the info about the mess he caused by locking the Phoenix inside Jean's mind when he read Wolverine's mind, and did all he could to help Jean master it instead.
- It also becomes obvious that Weapon X plays out differently than originally.
- Broad Strokes: While X-Men probably still happened more or less the same way it did in the original timeline (Rogue's got her white hair), the events of X2: X-Men United must have been altered for Jean to be alive and one of the good guys, as well as Mystique no longer being a murderous terrorist or Magneto's Dragon. Also, among the few things that remain from The Last Stand and Origins respectively are Kitty Pryde/Shadowcat being played by Ellen Page and Beast becoming Kelsey Grammer when older, and Wolverine having bone claws.
- Apparently certain characters were born earlier due to events in DoFP, such as Storm, Angel and Nightcrawler to name a few.
- Thief of Time: History was literally shattered by a "glass clock" that trapped the Anthropomorphic Personification of Time, and then patched back together (albeit with some weird gaps and miscellaneous changes) by the History Monks; the plot of the book revolves around the History Monks stopping someone else from making a second clock. It's implied that this explains the prevalence of Schizo Tech on the Discworld and some of the continuity gaps from earlier books.
- Mort: The Interface is the physical manifestation of the universe gradually retconning away Mort's 'mistake' in not taking Keli's life. More accurately, Mort changed how history is meant to go, and the Interface represents the inertia of history Cosmic Retconning it back again.
- In the Warcraft universe, the book trilogy The War of the Ancients RetCons some parts of Azerothean history due to a few people going back in time (most notably the blue dragonflight going from extinct to having enough members to wage war against all other dragons and some mortals at the same time).
- In the Dragonlance Legends books, much of the plot revolves around the efforts of various characters to Cosmic Retcon stuff they don't like in the past. Tasslehoff is central to this, because kender who travel through time can change the flow of events. First Tasslehoff tries to Retcon away the Cataclysm; Raistlin tricks him into breaking the time-travel device instead. Then Raistlin tries to Retcon away the death of Fistandantilus (since he himself has taken Fistandantilus's place in history), and succeeds, entering the Abyss instead of being blown to smithereens. Finally, Caramon and Tasslehoff wind up in a future where Raistlin wins, and return to the present in order to Retcon everything back to normal. The plot of Legends will give you migraines if you think about it too much.
- Jake's death, and the subsequently epic time-and-space-altering events that bring him back from the dead in The Dark Tower.
- The book Starbright and the Dream Eater has one, after Starbright manages to defeat the Dream Eater. She wakes up the next day and finds that every single reference to the "spindle sickness" that the Dream Eater created is instead replaced with a reference to a dangerous pesticide. Every person who got sick from spindle sickness got sick from the pesticide instead, and no-one except her remembers the Dream Eater even existed.
- Averted in the Star Wars Expanded Universe. Jacen Solo's brother, Anakin, died. Jacen develops the power to use the Force to time travel. Jacen's Sith apprentice is Anakin's girlfriend. Jacen's time travel, however, can only alter the events in his memory, not in reality.
- Used in the Star Trek: String Theory novels. When Voyager accidentally meddles with the "strings" underlying reality, space starts to unravel. The solution to the entire mess eventually involves rewriting thousands of years of history. An event which actually occurred within the current story (all photons within a certain range being drawn into Exosia, a realm of subspace) is now placed many millennia in the past. The starless Void from the Star Trek: Voyager Season Five opening episode is the result of this event. Its existence is therefore one big Cosmic Retcon, down to the species who developed there but technically didn't exist until a few weeks prior...
- In Star Trek: Department of Temporal Investigations, one of the characters is completely deleted from history by a particuarly malicious "uptime" villain ("Future Guy" from Star Trek: Enterprise). He proudly refers to it as the most satisfying achievement of his career.
- In Dream Called Time, Cherijo and Duncan end up in an alternate timeline where they never existed after convincing the Jxin not to transcend (and inadvertently make the universe a worse place in the process). Fortunately, the only effects on them are that they're entirely undocumented and that the only people who remember them are those with ripple-effect-proof memories. Including, somehow, their daughter.
- The Well World series by Jack Chalker has this as a power granted by someone who has root access to the Well World's main computer. Nathan Brazil had rebooted the universe at least three times.
- In The Wheel of Time this is a feature of its strongest magical attack, "balefire." Anything hit by balefire is erased from the past few seconds/minutes of time; anything living hit is Deader Than Dead, as the only known method of resurrecting someone without Reincarnation can only work if begun immediately after death. This not only stops the Dark One from bringing Quirky Miniboss Squad members Back from the Dead, it can be used to un-die main characters those villains had killed... but historically the spell was outlawed, after flagrant misuse caused Continuity Snarls threatening to unravel creation itself.
- Doctor Who Expanded Universe:
- Faction Paradox's has a far more insidious form of this: the Paradox Biodata Virus. It latches into the part of your biology linked to the Time Vortex... and makes it so you always have worked for them and always will. The Eighth Doctor was infected, and his timeline nearly destroyed.
Live Action TV
- The introduction of Dawn on Buffy the Vampire Slayer.
- And in the spinoff series Angel, the title character makes a Faustian bargain to have his son retconned into having lived a happier childhood and not remembering his real life (in which he was raised by a psychopath in hell). As a consequence, everyone else forgot about the boy's existence; so in a sense, it's the exact opposite of the Dawn scenario. Network higher-ups requested the retcon due to the show's dense continuity, which ended up being dumped back into the plot anyway.
- The latter part of Lost season 5 concerns the main characters, having traveled to 1977, attempting to prevent the plane crash which initially brought them to the island, thus undoing everything that has happened so far in the series. It doesn't work, though it does create its own side-effects later on.
- Doctor Who has loads, of course. (For Expanded Universe examples, see Literature and Radio.)
- Between the old and new series there came an off-screen event called the Time War, removing the Time Lords and Daleks (though Russell T Davies was rather reluctant to stick to that) and changing the Laws of Time. It's also a handy crutch for any inconsistencies.
- In series 5, the cracks in the universe play a similar role, erasing Rory Williams and the Doctor from history. They got better.
- In The Name of the Doctor, the Doctor's open timestream at his grave on Trenzalore provides The Great Intelligence with an opportunity to successfully retcon the Doctor's entire timeline, and Clara has to intervene throughout the Doctor's history to retcon the retcon. However, as of The Time of the Doctor, the Doctor no longer dies on Trenzalore, so the retcons may never have happened.
- In the 50th anniversary special Gallifrey's destruction itself is retconned. Instead of destroying it, the Doctors sealed Gallifrey away in a pocket dimension, and Eleven then goes looking for it.
- Occurs near the end of Mighty Morphin' Power Rangers. The villains turn back time to a period a decade or so before, and when the effect was canceled, anything that had changed during the reverse-time led to changes in the present day. Most notably, Aisha had moved to a small African village as a child, and Tanya's Adventurer Archaeologist parents had left her in America rather than the African village.
- Balthazar attempts this in Supernatural, traveling back in time to save the Titanic: this has the effect of ruining Celine Dion's career, creating 50,000 new souls for Castiel, and preventing the deaths of Ellen and Jo Harvelle. Unfortunately for them, Castiel resinks it at the end of the episode after Fate herself calls him out on it. The whole thing was on Castiel's orders, in order to create new souls for the civil war in Heaven that he's losing.
- The fourth season of Fringe picks up in a timeline that's been cosmically retconned as a result of Peter being erased from existance at the end of season 3. The differences are subtle — the prime universe Fringe Division has a different lineup, Walter is a shut-in, some characters are now strangers — but most of what happened in the previous seasons seems to have unfolded in the same way, or at least similarly.
- Kaizoku Sentai Gokaiger has the power of the Greatest Treasure of the Universe, which lets its discoverer rewrite the universe to suit their own desires. The Gokaiger ask if it could eliminate Zangyack, and are told that it would be as if Zangyack never existed — but that they would also erase all of the Super Sentai from existence too. They end up rejecting the "wish", deciding to take on Zangyack themselves, because facing impossible odds is what Super Sentai members do, and because they don't want to lose everything that they've gained and become as a result of the hardships Zangyack inflicted upon their lives.
- In Stargate SG-1, a two-part episode in Season Eight involved the team time-traveling back 5,000 years into the past, screwing something up, and then their counterparts in the alternate timeline had to time travel back again to fix it. In the end, the only visible difference was that Jack's pond now had fish in it.
- Star Trek: Voyager: The Krenim timeship from "Year of Hell" is a weaponized form of this. Its main weapon erases its target from past, present and future, resulting in it never having existed except in the memory of the timeship crew, which is insulated by technobabble. Unfortunately using it on the Krenim Imperium's current enemy the Rilnar means that ancient interbreeding between them never happened, meaning that the Rilnar never contributed a crucial antibody to the Krenim genome, meaning billions of Krenim are now dead of a plague. Annorax, the captain, spends the next couple centuries trying to undo his mistake with more temporal incursions, which eventually brings him into conflict with Voyager. The two-parter ends with Janeway ramming the timeship, causing it to erase itself, which pushes the Reset Button on the two-parter's entire plot.
Radio & Audio
- In Big Finish Doctor Who, Charlotte Pollard being saved by the Doctor causes her to become a living paradox meaning history starts breaking down, the CIA are around in 1937 before they should have been formed and Benjamin Franklin was a President. But after she saves the Web of Time the paradox and these events become part of the Web, therefore there is no paradox. Timey-Wimey Ball indeed.
- Nobilis has one of these in its Back Story. Something like 500 years of time were erased, but in an uneven way so that some events moved back the full five hundred years, some a portion of that and some not at all. The souls of all the people on the space colonies this erased are very upset, and seemingly still on the planet they used to live.
- This is also the goal of the Excrucians; they attack aspects of reality, causing them never to have existed.
- In GURPS Infinite Worlds, a retcon is called an "ontoclysm" or "reality quake", described as a cosmic event that can change the past and even the natural laws of a given universe. The game even gives rules for attempting to trigger one! It has been mentioned that superhero worlds are especially susceptible to reality quakes, and that any world with magic or super-powers could be explained by "shards" of the previous reality existing in the new universe (which sounds much like the DCU's explanations about the various Crisis of Infinite Retcons).
- One of the last adventures for Dungeons & Dragons 2nd Edition was Die Vecna Die!, in which the titular evil god gains control of the city of Sigil, a Cosmic Keystone that lets him restructure The Multiverse to his whim. He fails, but the city's rightful ruler, the Lady of Pain, can't put everything back together perfectly. This was implicitly meant to explain away the differences between the cosmologies of 2nd and 3rd Editions.
- Exalted manages to have its own equivalent of Crisis on Infinite Worlds during a First Age Historical Event called "The Time of Cascading Years". It was a rare foray into Temporal Mechanics for the series; Creation had split into 700 separate timelines, each one with only a single Celestial Exaltation in it. The timelines each reintegrated when that timeline's Exalt managed to save Creation in some massive way... which took longer for some than others. First Age historians basically ended up hand waving the calendar as 'skipping over' the Time of the Cascading Years in the year count, as some timelines were hundreds or thousands of years older than others. The writers primarily introduced it to allow Player Characters in the First Age to have Multiple Conflicting Continuities about "Who saved what from whom with how many chickens", who got to wield the Aidenweiss, and other sorts of badassery that would otherwise be exclusive to historical NPCs.
- The Mage: The Awakening Sourcebook Imperial Mysteries introduced this as a big trick of archmasters. Via Imperium Rites, they can build off of changes they've already made in the world to alter fundamental truths of reality, retroactively introducing changes to history or cosmology. This is part of how one becomes an archmaster (rendering the facts of one's existence only vaguely remembered to mages and not at all to others), and is the most well understood path to Ascension; you remake the world into one where your transcendence is and always was a fundamental property. Ripple Effect-Proof Memory is possible, but only to archmasters and only while within their Golden Road.
- Warhammer 40,000: anything and everything can be easily fixed with liberal application of Tyranids. This is how the Squats faction was quietly removed from the product line.
- The game Time Hollow involves the main character "fixing" Cosmic Retcons caused by the game's villain.
- In The Elder Scrolls series, the Warp in the West, which among other things, allowed each of the Multiple Endings of Daggerfall to be true.
- Tiber Septim was said to be capable of this. Perhaps the biggest example is the province of Cyrodiil itself, which, before he came around, was all tropical jungle. These days it is more of a temperate forest.
- This was retconned again in The Elder Scrolls Online. Now they're saying it's a case of Future Imperfect and Cyrodiil was never a jungle. So they're saying that it was never a Cosmic Retcon after all, and just a mistranslation of old documents.
- Given that timelines are confusing and tangled in the Elder Scrolls lore when divine beings are involved and paradoxes are rampant as a result (Vivec has two contradicting origin stories which are both true, for example. Or how all six of Daggerfall's mutually-exclusive endings are canon), it's possible that the temperate Cyrodiil in The Elder Scrolls Online was a retroactive change to the timeline by Talos.
- Tiber Septim was said to be capable of this. Perhaps the biggest example is the province of Cyrodiil itself, which, before he came around, was all tropical jungle. These days it is more of a temperate forest.
- Sonic the Hedgehog (2006), in which the ending writes the game out of continuity, though Sonic still has memories of what happened.
- And then Sonic Generations happened, reintroducing the game as an alternate timeline.
- City of Heroes has the PsychoChronoMetron, a device that allows psychics to alter the world. It was only used once; as something of an aversion, it caused a Continuity Snarl as the villainous inventor attempts to use it to turn a hero into an ally, without knowing anything about his history. The history of this hero was left... somewhat confused.
- This happens in Suikoden Tierkreis whenever the world undergoes a radical change. The cause of these events is worlds fusing together, the actual retcon part is an effect of the True Chronicle.
- The newest Mortal Kombat game has the Raiden from Armageddon broadcasting a premonition to himself around the time of the tournament from the first game. The Raiden of the past is now imbued with knowledge of events to come and sets about changing them (hopefully for the better).
- Failure, thy name is 'Raiden'. Through the inscrutable phrase "he must win", Raiden ends up making things a lot WORSE this time around. By the end of Mortal Kombat 3, his misinterpretation of said phrase leads to nearly every single Earthrealm warrior dead and just in time for the events of Mortal Kombat 4 to begin with a massively stacked deck for the side of evil. It's still a Cosmic Retcon as he averted the Armageddon and possibly sealed Shao Kahn for good...but at a terrible cost.
- In Fable II, Lord Lucien originally intended to rebuild the Tattered Spire in order to bring back his deceased wife and daughter, but by the time the Hero of Bowerstone gets to him to rescue the other three Heroes who are trapped by him, Lucien decided that the world itself needed a Cosmic Retcon. However, the Hero of Bowerstone prevents Lucien from accomplishing this and either kills him or lets Reaver shoot him after explaining himself. After this, Theresa gives the Hero the choice of one of three wishes, two of which are in themselves retcons of history.
- The events of the first game of the Prince of Persia: The Sands of Time trilogy are retconned twice. First within the game itself, when the Prince rewinds time at the end of the game and kills the Vizier that kicked off the events of the game, and then again at the end of Warrior Within, inadvertently retconning the Vizier's death, causing him to come back as the Big Bad of Two Thrones. By the time Two Thrones rolls around, the first game's story has ceased to exist in its entirety, and only the Prince remembers what happened.
- Final Fantasy Crystal Chronicles: Ring of Fates has this as its ending. The Yuris and Chelinkas from every parallel world rewrite reality to prevent the tragic events of the game and resurrect their family. Yuri and Chelinka remember, but nobody else does.
- Drakengard 3 uses this trope as a central plot device. Accord, a cyborg girl from the Old World who serves as the story's narrator, tries to find a branch where The Flower is sealed away and no Intoner survives. The way alternate timelines are handled has been compared to Steins;Gate.
- One of the endings of Saints Row: Gat Out of Hell is God rebooting the Saints Row universe to a world where Johnny, Kinzie and Matt are cops. This ending leads to the Agents of Mayhem universe.
- The weapon of the Chrono Legionnaire in Command & Conquer: Red Alert 2 does this. The target is locked in a time bubble and slowly erased from existence. More 'complex' (i.e. expensive) units take longer to erase, presumably because every individual component must be written out of history.
- The Mirror Realm in Blank Dream supposedly has the ability to grant one's greatest desire. In Mishiro's case, she wants to make it so that she never existed at all.
- The opening of Megadimension Neptunia VII's second act is one of these taking place, wiping the CPUs from collective memory and establishing Gold Third as leaders in their place. It puts focus on the "retroactive" part of "retcon" too, the nations now appearing as though their Gold Third has been running them for years instead of days. Since none of them even wanted this in the first place, the world is falling apart.
- In Narbonic, Dave goes on a time-travel adventure. Afterward:
Dave: I guess this proves that time is a closed system, unalterable, our fates inescapable. I guess I'll have a cigarette and brood.Mell: Since when do you smoke?
- In the Web Comic Thog Infinitron, a movie producer interested in optioning the comic for a live-action movie says his offer hinges on the creators making a change to Thog's origin. The resulting retcon sets off an alarm in a time travel watchdog agency.
- Deletionism...er, Retconjuration is the school of magic that allows the Titans of Erfworld to do this.
- The original run of Zortic ended with a fight between two cosmic beings creating a big swirly Negative Space Wedgie, which the heroes all fell into. The comic went on hiatus for a short time, and then came back, starting over from the beginning. The original run of Zortic was based exclusively on parodying popular science fiction franchises; the two cosmic beings were arguing over the merit of this. The new version is intended to be more original and less parody-driven.
- Fairly late into Homestuck, John and an entourage of trolls find a supposed weapon that could be used to destroy the Big Bad. It is intangible, however, and reaching into it causes John's arm to show up all over the comic's history. To help sell the effect, the panels in question (and a few Flash animations) had the arms put in retroactively. It's later discovered that it allows John to alter the Alpha timeline entirely without creating a doomed timeline as a result, meaning Cosmic Retcon is his superpower.
- A few hundred pages later, this is done again, but with less impact on the plot. After John met his Denizen and completed his quest by getting rid of the oil on his planet by zapping it through existence using the power mentioned above, smudges of oil "suddenly appeared" on a lot of old panels.
- Terezi has now sent John on a mission to change subtle things in the timeline in hopes that it will fix everything that has gone wrong. For now, it seems this mostly involves keeping Vriska from being killed.
- An explicit power of the Big Bad in Captain SNES: The Game Masta. So far, it seems she can only retcon things within the framework of existing backstory, fleshing things out in a way favorable to her... but its implied that at full power, she isn't so restricted.
- The non-canon El Goonish Shive, EGS:NP storyline "Oblivious Wand Waving" features a wand that does this while seeming to do nothing from the perspective of both the user and everyone else around them.
- In The Spoony Experiment, Linkara punched the wall in order to bring back Spoony a la Superboy Prime, but only succeeded in changing Donna Troy's origin story again and turning Dr. Insano into a man.
- To Boldly Flee works this way for the entire Awesomeverse, explaining any kind of continuity errors in previous stories as the Plot Hole retroactively screwing with reality, and any future mistakes being the result of the Plot Hole merging with the universe as a whole, effectively breaking reality. Best summed up by this exchange:
Doctor Insano: The Plot Hole created havoc because we used to live in a universe that made sense, but now that the whole is the universe, there is no conflict.JO: But that doesn't make sense.Doctor Insano: Nothing does! Isn't it great? Crazy's the new normal...Luke: But I don't want to live in a giant mistake!Doctor Insano: Well tough shit, nothing's perfect kid.
- In Worm, part of the author's justification for his rewriting of Chapter 7.9 a day after it was posted was Coil, the boss of the protagonist's team, had the power to split the world into two timelines and then collapse whichever one he didn't like.
- In season 2 of Danny Phantom, Danny accidentally gets his ghost powers removed by a Literal Genie, leaving Sam to recreate the event that gave him his powers in the first place, except she puts a "DP" logo on his suit so that he'll have it in ghost form. When she decides it'd be easier to just wish everything back to how it was, she does so, but specifies that the second version of him getting his powers be the canon one, because she really likes how he looks with that logo.
- Fry's travel back in time created his time-copy, which also allowed them to retcon the most heartbreaking episode of the series.
- In fact, the whole Bender's Big Score movie is just made of this trope. It even leads to a giant rip in the universe by the end when Bender meets all of his past selves hidden in the caves under Planet Express with all of history's treasures and convinces them to all emerge at the same time instead of when they were supposed to, at which point Nibbler exclaims "Everyone out of the Universe!" and eats himself.
- In one of the early episodes of The Avengers: Earth's Mightiest Heroes!, Captain America's sidekick Bucky is violently killed during World War 2. Then near the end of the first season, Cap accidentally touches the Cosmic Cube, which grants his greatest desire by retroactively changing history so that Bucky survived the explosion.
- All the retcons in Ben 10: Omniverse are explained by the entire universe getting destroyed and then getting imperfectly recreated by Ben in Alien X form in the seventh note episode of the series. One of the main changes is that the living planet Primus, which used to be a massive DNA storage for the Omnitrix and which played a major role in season 3 of Alien Force, no longer exists. Whether this means Eunice is also Ret Gone is unclear; she was on Primus, but her existence wasn't directly tied to it. Word of God is that she's "unlikely" to appear in Omniverse.
- This came up again in another episode shortly before the series ended, where Ben was put on trial for it. Ben's lawyer defends him by claiming these kinds of changes were previously done all the time by others of Alien X's species, using as evidence Azimuth's appearance and/or voice having completely changed at least three times.
- Scooby-Doo! Mystery Incorporated ends with one. The Nibiru Entity is defeated when the crystal sarcophagus it was using to draw power from another dimension is destroyed. This results in the sarcophagus imploding into a black hole and erasing the Entity from existence. As a result, everything is changed to be as if it never existed at all.