A Reality Bleed is where one version of reality is gradually overwritten by another. Unlike when we go DownTheRabbitHole, the alternate reality comes to us and begins to infringe on the real world.

This is similar to OrWasItADream, but isn't isolated to a specific item or person. Instead, all of reality is up for grabs. If it is caused by a specific individual, they are an extremely powerful RealityWarper. In a time travel story, it would be a symptom of the DelayedRippleEffect.

This generally begins a little at a time -- an anachronistic lamp or the wrong face on a coin -- but it gets worse until the process is stopped or it completely supplants the original reality.

This can either be an example of the protagonist going insane, or he could be the only one who realizes that something is very, very wrong. In some examples, everyone is aware of the changes, usually resulting in mass panic.

Due to the questionable reality inherent in the presentation of this trope, often the world being changed wasn't real to begin with. Sometimes it's even the real world which infringes on the false reality.

Compare CrashingDreams, which is when reality infringes on a dream or daydream.

[[folder:Anime and Manga]]
* This happens towards the end of ''Manga/ThoseWhoHuntElves''.
* ''Anime/SerialExperimentsLain'': What are the boundaries between reality and cyberspace?
* Happens during the climax of ''Literature/{{Paprika}}''.
* ''Anime/ParanoiaAgent'', made by the [[Creator/SatoshiKon same creator]] as ''Paprika''... [[MindScrew at least, we]] ''[[MindScrew think]]'' [[MindScrew that's what's going on]].
* In ''{{Anime/Noein}}'', this was an effect of Haruka's power.
* ''LightNovel/HaruhiSuzumiya'' has enough of this. The closed space Haruhi creates, as well as an AlternateUniverse and the ability to interfaces to warp sections of reality as they see fit (basically making it their own dimension). And then some more examples.
* In ''Manga/{{Berserk}}'', BigBad and RealityWarper ''extraordinaire'' Femto is able to [[spoiler: redirect the force of Skull Knight's attack using a sword able to cut the fabric of reality itself so as to cause the various supernatural layers of the LayeredWorld to fuse with the mundane layer in which we exist]]. The end result is that AllMythsAreTrue and [[EverythingIsTryingToKillYou most of them want to eat you]].

[[folder:Audio Play]]
* The plot of the ''AudioPlay/BigFinishDoctorWho'' story "[[Recap/BigFinishDoctorWho040Jubilee Jubilee]]" is kicked off by a serious TARDIS malfunction, which causes the Sixth Doctor and his companion Evelyn to arrive at the same location in London but a century apart simultaneously; one version of them arriving in 1903 and another version arriving in 2003, the latter of which has become a BadFuture, due to the Doctor who arrived in the past's interference. The Doctor who is stuck in the BadFuture, only gradually figures this out, as he gets in sporadic mental contact with his alternate self, who has taken TheSlowPath and is still alive, being kept as a prisoner by the local dictator, and to his horror he realises that the universe is struggling to resolve the paradox resulting of this rather serious TimeCrash, causing the 1903 and 2003 timelines to bleed into each other with rather disastrous results.

[[folder:Comic Books]]
* In ''ComicBook/MyLittlePonyFriendshipIsMagicIDW's'' "Reflections" Arc, this happens at the end of issue #20, as the barrier between the two versions of Equestria begins to collapse entirely.
* In the ''ComicBook/CrisisOnInfiniteEarths'', this takes place on a universal scale.
** Its sequel ''ComicBook/ZeroHour'' also had this effect.
* In the fifth-week event ''ComicBook/TheKingdom'', a sequel to ''Comicbook/KingdomCome'', this happened to Batman in the Planet Krypton restaurant as aspects of the multiverse began to appear inside.
* In ''ComicBook/EmperorJoker'', after SelfDemonstrating/TheJoker recreates reality in his own image, tiny reality bleeds from what used to be the real world provide hope for the heroes.
* In Creator/GrantMorrison's ''Kid Eternity'' mini-series, this occurs when a folklore researcher witnesses urban legends actually occur in the real world.
** Morrison loves this trope as seen in his run on ''Comicbook/AnimalMan'' as well. A second ''Crisis'' starts (see above entry), resulting in multiple forgotten "ideas" bleeding into one another.
** This is also the main plot of the Orqwith arc of ''Comicbook/DoomPatrol'': a fictional city starts to bleed into reality.
* In the ''Comicbook/XMen'' / ''ComicBook/FantasticFour'' crossover "Days of Future Present," this is caused by the [[spoiler:ghost of]] Franklin Richards from the Days of Future Past storyline.
* Even though WordOfGod was that it was just a warping of reality, multiple followup stories establish ''ComicBook/HouseOfM'' as an instance of this by Scarlet Witch. Rather than "simply" rewriting the 616 history she essentially copied an existing one over it.
* Marvel universe's Tomorrow Man, Zarrko the time traveler, is introduced in a Hulk story arc as existing in perception of fourth dimensional space. His presence gives off an energy that causes different time periods to bleed into the present moment, illustrated as bystanders switching to different period clothes from across the world between panels without noticing.
* In Marvel's ''Comicbook/{{Inferno}}'' crossover, the villains open a portal to the hellish dimension of Limbo which causes Manhattan to transform into a demonic version of itself. The overall goal was to spread this to the entire world.

[[folder:Fan Works]]
* ''FanFic/TheConversionBureau'' comes about as a result of a [[AdvancingWallOfDoom particularly dangerous]] one.

* ''Film/EXistenZ'' calls this a "reality bleed-through effect."
* ''Film/CoolWorld''. As the film reaches its climax, the toon world begins to infringe more and more on the real world.
* ''Film/{{Pleasantville}}'': After the two protagonists enter the black-and-white world, larger and larger splotches of color become apparent, until the entire world is in color.
** [[spoiler:And color was just the beginning. The town isn't just rewritten, it expands into an entire alternate world. Crazy stuff.]]
* ''Film/OverdrawnAtTheMemoryBank''. In this case, it is the main character's own mind that overwrites a fictional reality.
* This occurs in ''Film/{{Franklyn}}'', a 2008 British film. If I remember correctly, it includes one of the rare instances when a reality bleed manages to occur quite quickly.
* Creator/IngmarBergman's ''Film/HourOfTheWolf''. "You see what you want to see."
* Terry Gilliam's ''Film/TheFisherKing'' (and many of his films, for that matter) begin to erupt with this trope.

* Creator/PhilipKDick loved this trope and used it in many of his works:
** In ''Literature/{{Ubik}}'', Glen Runciter's image begins to manifest itself everywhere. And then, although the story is set in 1992, the year 1939 tries to get in on the action.
** ''Literature/{{VALIS}}'' and its sequels were, more-or-less about this happening to Dick himself, in real life.
** In ''Literature/TheThreeStigmataOfPalmerEldritch'', the drug "Chew-Z", discovered by Eldritch in the Prox system, ''seems'' to have this effect, although the book is deliberately ambiguous.
* Creator/WilliamGibson's ''The Gernsback Continuum'' is about this. The main character is a photographer, and working on documenting "the future that never was", mostly the future as seen from the 1950s. Then he starts slipping into that reality...
* Creator/HarlanEllison's "Jeffty Is Five" is an unusual version of this. Jeffty is a boy who has remained five years old for over twenty years. He can listen to old radio shows on his radio... yet they are new episodes of the shows, episodes that have never existed in the "real world". He can buy comics such as Radio/TheShadow and Franchise/DocSavage that are, again, all-new although they are no longer being produced, not to mention long-discontinued pulp magazines with new stories by Stanley G. Weinbaum, Creator/EdgarRiceBurroughs and Creator/RobertEHoward despite the authors being long dead. As reality begins to bleed over into Jeffty's world, it isn't pretty.
* In the Creator/JorgeLuisBorges story, "Literature/TlonUqbarOrbisTertius" an encyclopedia is discovered with a detailed description of the fictional planet of Tlon, which was created over centuries by an AncientConspiracy of philosophers, scientists and writers. Everyone is fascinated by the discovery and discusses endlessly all aspects of Tlon. Then gradually objects from Tlon start appearing in the real world... the ending implies that reality will be completely replaced and the Earth will eventually become Tlon.
* Sort of an odd subversion? Well, something kinda like this was Creator/RayBradbury's ''[[Literature/TheMartianChronicles Dark They Were, and Golden-Eyed]]'', where a fledgling colony on Mars starts to gain a peculiarly insightful understanding of the extinct Martians, until [[spoiler: they literally ARE Martians by the end of the story]].
* In Creator/TerryPratchett and Creator/NeilGaiman's ''Literature/GoodOmens'' this occurs when a powerful and impressionable young RealityWarper reads too many New Age magazines, and [[ConspiracyKitchenSink things like Tibetan tunnels and alien visitations start becoming true]].
* In Creator/NealShusterman's novel ''Literature/TheEyesOfKidMidas'', the AmuletOfConcentratedAwesome gradually reshapes reality around the protagonist's dreams as he loses control of its power.
* The protagonists have to stop one of these in Creator/DianeDuane's ''Literature/ToVisitTheQueen''.
* In Creator/TerryPratchett's ''Discworld/{{Mort}}'', the titular character saves the life of a princess who was supposed to die. The princess then becomes the centre of an alternate reality bubble in which she didn't die, but the bubble is shrinking...
** In ''Discworld/LordsAndLadies'', when TheFairFolk invade Lancre, their country tries to come through as well, CropCircles being caused by this. At one point the characters witness the two realities fighting for supremacy.
* In the ''Literature/YoungWizards'' series there's a spell to do this, which is particularly useful for preserving the {{Masquerade}}. For instance, say that a bunch of monsters invaded Grand Central Park in New York City. The wizards can cast a spell to find an alternate reality where Central Park is monster-free, copy that version onto their universe, and *BAM*, not only are the monsters gone, there never ''were'' any monsters in the first place (except in the RippleEffectProofMemory of the wizards).
* Happens in Creator/KimNewman's "The Original Doctor Shade" where an author is hired to revamp an old franchise. However, the original versions of the characters start intruding into the real world and aren't happy with his changes...
* This may well be the result if the [[spoiler: Outsiders]] manage to win in the ''Literature/DresdenFiles''
* In ''The Place of the Lion'' by Creator/CharlesWilliams, the higher reality of Platonic archetypes begins bleeding through into our world, replacing all the mundane examples of each Platonic Form. So, for instance, the titular Lion, which represent Power, starts draining all the strength and energy out of everything near it.
* In the Franchise/StarTrekExpandedUniverse novel ''Q-Squared'', a Trelane from an alternate universe starts merging three different realities into one, just for the hell of it. Three ''Enterprise''s start to intersect: the Prime Universe's, the one where the ''Enterprise''-C never went back in time and the Federation is at war with the Klingons, and one where Jack Crusher is the captain of the ''Enterprise'' with Picard as his NumberTwo (and Data is a human body with a positronic brain). In the end, Prime!Picard and Prime!Q stop Alternate!Trelane, splitting the realities. However, while the Prime Universe is largely unaffected, the second reality is worse off with both Second!Picard and Second!Riker dead, and Second!Data stuck in the third reality. In the third reality, Jack Crusher accidentally kills Third!Beverly and then [[AteHisGun eats his phaser]], leaving Third!Picard in command.
* Immersive Virtual Reality in {{Literature/Idlewild}} allows students to program their own personal domains. When they make personal phone calls to each other the system mashes the domains together.
* ''Literature/TheGodsThemselves'' by Creator/IsaacAsimov has the physics version of this driving much of the conflict of the novel. The physics of a parallel universe start leaking into ours. At first this seems like a good thing, because it's a way of generating energy (on both sides), but some scientists start to suspect there may be unforeseen consequences ([[spoiler: unforeseen by us, that is; the inhabitants of the other universe have known it all along, and don't care, because they'll get all the energy they could ever want when our sun goes nova]]).
* A temporal variant of this occurs in Jack Finney's early story "I'm Scared" in which elements of the past begin to appear in the present. (e.g., the sudden appearance on the outside of a house of a wide strip of the original paint from decades before.) These elements begin growing in size and effect as the story progresses.

[[folder:Live Action TV]]
* Happens in the season 5 finale of ''Series/BuffyTheVampireSlayer'', when Glory uses Dawn's blood to lower the barriers between worlds and things start bleeding together until the portals can be closed (by Buffy's death)
** "Nightmares" might also count-a comatose boy's psyche was somehow causing a bleedover and warping of reality and everyone's nightmares.
* ''Series/DoctorWho'' features several stories where temporal events cause bleedover from other time periods, including [[Recap/DoctorWhoS9E1DayOfTheDaleks "Day of the Daleks"]], [[Recap/DoctorWhoS11E2InvasionOfTheDinosaurs "Invasion of the Dinosaurs"]] and [[Recap/DoctorWhoS21E2TheAwakening "The Awakening"]]. Perhaps the ultimate example is [[Recap/DoctorWhoS32E13TheWeddingOfRiverSong "The Wedding of River Song"]], where all of earth's history starts happening at the same time, and only the Doctor realises anything is wrong.
* Occurs the season one finale of ''Series/{{Eureka}}''. [[spoiler:The majority of the episode takes place in an alternate time-line created by Henry to prevent Kim's death. Soon after jumping to the alternate (future) time-line, the two time-lines begin merging with destructive consequences.]]
* In ''Series/{{Fringe}},'' there is an alternate dimension, and the walls are breaking down. Things in one universe begin to affect the other, or are even forced to exist in the same place at the same time, to disastrous effect. The other world has it worse and is becoming nearly unlivable, but "ours" is on the same path, and if unchecked, both worlds will be destroyed.
** In another sense, Peter Bishop is a walking reality bleed, since the new timeline was created in which Walter failed to save him as a child, but he still reappeared as an adult. Eventually reality goes through another shift when Olivia [[spoiler: regains all her memories from the original timeline]].
* In ''Series/KamenRiderGaim,'' the otheworldly Helheim Forest is beginning to leak into our world. However, it gets much more complicated than that before it's over.
* A common occurrence in ''Series/SapphireAndSteel''.
* An odd inversion of this occurs in the ''Series/StarTrekTheNextGeneration'' episode "Remember Me." [[spoiler:The false reality Dr. Crusher experiences begins to disappear, with people and objects disappearing until the whole universe was the size of a room, populated by one person.]]
** A different version comes in "Parallels", but that's because [[spoiler:Worf is somehow jumping between parallel universes thanks to a rift in reality. The next-to-last commercial break ends with realities clashing together and thousands of ''Enterprises'' appearing near the rift.]]
* Happens in at least one ''Series/TheTwilightZone1985'' episode. In the episode "Wordplay", a man is having trouble learning a new product line, and the words start replacing regular words, a little at a time. Pretty soon no one can understand him, and he can't understand them -- even though they're using the same words, they mean totally different things. [[spoiler:Or, he had a stroke.]]

[[folder:Tabletop RPG]]
* A fast version of this occurs across the entire Earth in ''TabletopGame/{{Torg}}''. Invading "cosms" take over our reality, changing the laws of nature to match their own. However, certain objects known as "hardpoints" have a strong connection to their original reality and maintain it around them, preserving it even when surrounded by a cosm -- e.g. the Eiffel Tower maintains Paris in a bubble of our reality, despite the rest of France now being part of the cosm of the Cyberpapacy.
* ''TabletopGame/WerewolfTheForsaken'' has places called verges where the spirit world bleeds into the real world.
* ''TabletopGame/MageTheAwakening''
** The [[EldritchAbomination Abyssal intruders]], some of which overwrite [[RealityIsOutToLunch the local laws of reality]] or [[RetGone the timeline]] when they visit the Fallen World. One example is [[AlienGeometries The Twisting Maze Zone]], which will usually overwrite an apartment building and turn it into a labyrinthine superstructure that extends in all dimensions, including ''time''. Eventually, the building -- and everyone who was in it at the time -- gets written out of existence because it was never there in the first place. The only way to cure it is to walk through it ''exactly'' as it is in the real world, ignoring all deviations -- basically forcing the way it ''should'' be back into place.
** Even worse: the Nemesis Continuum. It's a set of physical laws from the Abyss, and every time you understand one, the next one makes a little more sense. And as people understand them, they become real. Suddenly, the SquareCubeLaw no longer applies, or objects of a certain size are no longer subject to friction... the worst part is that just looking at them for long enough can get them into your head, and as for trying to get rid of them -- well, how do you fight ''math''?
* ''TabletopGame/MagicTheGathering'': The Overlay of Rath, Yawgmoth's plan to [[DemonicInvaders connect Phyrexia to Dominaria]].
** When the Shards of Alara begin to unite once again, the reality of each shards begin to bleed into each others. The good news is that it means there are now force of life in {{Mordor}}. The bad news is that it means there are now demons and zombies in {{Arcadia}}.
* ''TabletopGame/{{Exalted}}'': Creation itself is a reality as defined by Primordials, which was grown by devouring the Wyld and absorbing everything. This is not a good thing if you're a Raksha. Whenever the reality of Creation doesn't keep the Wyld at bay strongly enough, it creates [[RealityIsOutToLunch all sort of interesting effects]].
** The Underworld is reality as defined by slain Primordials, and they try to drag Creation with them to Oblivion. When the Underworld seeps into Creation, it creates Shadowlands.
** Finally, Hell is reality as defined by broken and imprisoned Primordials, and they try to wrestle Creation back from their conqueror by overlaying Hell with Creation via demonic cults. Keyword here being ''try''.
* Policing reality bleeds and the things that cause them is the whole concept of TabletopGame/TheWhisperingVault.
* ''TabletopGame/{{Warhammer 40000}}'': The Warp is the realm of emotion and demons, where FTL ships travel and from which psychic power is derived, and fortunately has very little crossover with reality. Until you go to the [[NegativeSpaceWedgie Eye of Terror]], of course, an area of the Milky Way where the warp and the Materium intersect, born from the creation of the last Chaos god(dess). The Traitor Legions who gave themselves to Chaos ten millennia ago still live here, periodically launching Black Crusades on the rest of the galaxy.

[[folder:Video Games]]
* The ''VideoGame/NanashiNoGame'' series. The haunted video games begin to make themselves more and more apparent in the real world.
* The VideoGame/ChzoMythos has this happen in ''6 Days a Sacrifice'' -- as each day goes by, the hallway slowly changes to resemble the basement of the [=DeFoe=] Manor [[spoiler: to show [[TragicMonster John DeFoe]]'s slowly taking over the [[ChurchOfHappyology Optimology]] complex]].
* The VideoGame/RPGMaker game ''Videogame/VisionsAndVoices'' is set in a small village that starts out relatively normal. Then mirrors become portals to bizarro versions of the real world, other objects become portals to fantastic dungeons, strange buildings appear, and finally every building in town becomes linked through a bizarre, monster-filled [[BodyHorror flesh dungeon]].
* This is generally how one finds a deeper layer in the ''Franchise/SilentHill'' series. The town is relatively normal, if a bit creepy, when suddenly you see a rusty wheelchair.
* Happens in ''VideoGame/FatalFrameIIITheTormented''. The Manor of Sleep and the waking world seem ''mostly'' separate at the beginning of the game. As the story progresses, however, things such as the photographs taken in the manor and even the manor's ghosts begin to appear in the waking world.
* In ''VideoGame/GuildWars Nightfall'', the world the players inhabit becomes more like the Realm of torment as the game goes on. Completing this process is the goal of the bad guys, while the players are attempting to stop and reverse the process. A couple of zones actually change for particular missions in the story, and later zones in the story have a more "Nightfallen' feel to them as the process occurs.
* This starts to happen in ''VideoGame/TheLongestJourney'', though it's less about one reality overwriting the other, and more about two largely incompatible realities attempting to merge with each other.
** Technically, the realities are compatible. In fact, they used to be one. However, as people became more adept at both science and magic, it became clear that the world would eventually be destroyed. Thus, it was split in two (with some extra pieces left behind such as Storytime, Mrs. Alvane's house, and the Guardian's realm): Stark (world of science) and Arcadia (world of magic). Magic is impossible in Stark because of strict laws of nature. Science is impossible in Arcadia due to the laws of nature being in flux.
* This is the main problem in ''Videogame/{{Persona 2}}'' (both versions) as the BigBad starts making every false rumor and conspiracy theory become real just ForTheEvulz. (The good guys also exploit this by spreading rumors convenient to them.) [[spoiler:Unfortunately, Nyarlathotep's ''way'' better at doing it.]]
* This is the main mechanic in ''Videogame/{{Radiant Historia}}''. The game requires the player to alternate between two timelines where actions of the player in one have changing effects in the other.
* ''VideoGame/StrongBadsCoolGameForAttractivePeople'' has this happen in episode 5, "8-Bit is Enough". A malfunctioning Trogdor cabinet leads to Free Country USA being combined with the worlds of assorted {{Fictional Video Game}}s.

[[folder:Web Original]]
* Happens frequently in ''WebAnimation/HomestarRunner''. Many things that are considered part of the overall Homestar Runner universe such as Trogdor the Burninator, Sweet Cuppin' Cakes and Limozeen started as Strong Bad's random ruminations. This has been lampshaded at least once.

[[folder:Western Animation]]
* In ''WesternAnimation/TheFairlyOddParents'', Timmy becomes obsessed with action movies and wishes for life to become one. No one except him notices the difference.
* ''WesternAnimation/{{Gargoyles}}'': In "The Mirror", Puck [[spoiler:changes the gargoyles to humans and the humans to gargoyles]] but afterwards they all insist that everything is as it has always been.
* In one episode of ''WesternAnimation/{{Chaotic}}'', Underworlders appeared in the Real World from the land of Chaotic by means of an inter-dimensional portal, attempting to take it over. [[spoiler: It was actually AllJustADream, as Kaz was really just dozing off while attempting to cram for an upcoming test.]]
* In ''WesternAnimation/MyLittlePonyEquestriaGirlsFriendshipGames'', the human Twilight's pendant keeps causing a ManaDrain on the Humane Six, and after it drains Sunset's magic while she's touching the portal, it causes portals to Equestria to appear every time it opens. [[spoiler:When Twilight becomes Midnight Sparkle, she starts ripping holes into Equestria willy-nilly, causing reality to fracture, uncaring that she's destroying her own world in the process of reaching Equestria, even after Sunset says that she's destroying her own world to get there]].
* In the animated ''WesternAnimation/{{Jumanji}}'', whenever someone cheats, "if you don't come back to the game, the game comes to you". Which is funny, seeing how in the film which this series [[AlternateContinuity was inspired by but is definitely not a continuation of]], the game coming to you was how it always worked.