Line #36 Main/BackstoryInvader


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7	->''"Our memories define us. Adam changed those memories, he changed who we are."''
8	-->-- '''Captain Jack Harkness''', ''Series/{{Torchwood}}'', "[[Recap/TorchwoodS2E5Adam Adam]]"
9
10	A new character appears in a work partway through, but for some reason the established characters don't notice and treat them as if they've always been part of the team or community. Sometimes, they may even discuss the character's involvement in past events which the audience knows that they didn't play any part in.
11
12	The reason is some kind of in-universe SF or fantasy phenomenon. Common examples are FakeMemories, where the characters' memories have been altered without actually changing the past, or outright {{Reality Warp\|er}}ing, where the timeline has been forcibly altered to insert the new character. At times this may be a particularly visible effect of a larger-scale CosmicRetcon.
13
14	This is usually a villainous move, as changing people's memories or whole pasts without asking them can seem like a violation. Sympathetic characters who do this are often suffering from PowerIncontinence, and may even be unaware of the truth themselves.
15
16	Inversions are also known, where a character genuinely did exist in the past, but some kind of phlebotinum previously prevented the other characters, and [[TheFourthWallWillNotProtectYou presumably the audience]], from noticing or remembering them.
17
18	Not to be confused with RememberTheNewGuy, where a new character is introduced as if they have always been around somehow in the background or just off-screen, and the audience is expected to simply accept it, because the writers couldn't be bothered to write a proper character introduction for them. Many examples of this are, however, intended as parodies or deconstructions of that trope. Compare the difference between TheNthDoctor and TheOtherDarrin. A type of RevealingContinuityLapse.
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20	Since this is almost always a massive spoiler, no spoiler code will be used in examples. Consider yourself warned.
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22	----
23
24	!!Examples:
25	[[foldercontrol]]
26
27	[[folder:Anime and Manga]]
28	* ''Manga/{{Bleach}}'': Shukuro Tsukishima has the reality-warping variant as a power. He did a RememberTheNewGuy on near everyone Ichigo knows, as part of a gambit to confuse Ichigo into handing over his life. By adding details, he can do things such as change the environment, learn about others, or make them collapse from the stress of conflicting info. Most importantly, he can reality-warp an entire fanfiction about himself as a captain's personal sensei - which lets him use that one-on-one training against them when he undoes the insert. This particular method has a weakness, however, in that [[LogicalWeakness Tsukishima can't counter tactics or techniques his opponent has never used before]] (read "[[IndyPloy is improvising on the spot]]"). It's also got the weakness that being the most important person in the world to someone doesn't matter if the person he's trying to manipulate values the moral judgement of another over their bonds; after he sets himself up as Byakuya's beloved teacher and confidant, Byakuya simply concludes that being Ichigo's enemy is enough reason to turn on him.
29	* In ''Manga/{{Boruto}}'', Kawaki ends up causing one via the Omnipotence power of Eida. Because he wishes to protect Naruto, and to eliminate all the Otsutsuki, which includes Boruto, he inadvertely causes the memories of everyone on the planet to be altered, and they now perceive Kawaki as the true son of Naruto, and Boruto as the outsider. All because in this way, Kawaki's quest to kill Boruto is made easier. Omnipotence is also so powerful, that people are made to progressively ignore more and more any possible discrepancy between their new memories and the reality (such as why would Kawaki be modified by Kara, if he was the son of the Hokage who was born and raised in Konoha), and while it is possible to fight off its effects by focusing on said discrepancies or choosing to have faith, people do still feel the shinjutsu trying to numb any sense of doubt. Eida herself suggests that it's unlikely that it can be reversed, and believes it'd be better to overwrite it with new memories, which is risky in its own way.
30	* Rolo Lamperouge from ''Anime/CodeGeass'' manages to insert himself into the main cast between seasons 1 and 2. Specifically, he is supposedly the main character Lelouch's little brother (replacing the sister he had previously, Nunnally). He's really an assassin who has been appointed with the mission of keeping watch over Lelouch, after the Ashford students are given FakeMemories and an amnesiac Lelouch is sent there as well, to keep him out of the way of TheEmperor's plans. [[BodyguardCrush It]] [[{{Yandere}} doesn't]] [[BecomingTheMask work]].
31	* In ''Manga/FairyTail'', when Master Makarov selects the candidates for the S-Class exams, one of them is Mest, a character we have never seen before, yet everybody claims he is a valued Fairy Tail member. He is a spy named Doranbolt who inflicted FakeMemories on everybody. And then, hundreds of chapters later, he is revealed to have been a Fairy Tail member from the beginning who even erased his own memories to spy on the Magic Council. Oh, and Mest ''is'' his real name.
32	* The "Kintama Arc" in ''Manga/{{Gintama}}'' revolves around the introduction of Kintoki, a mysterious new character who has replaced Gintoki as the protagonist of the series. He somehow has preexisting connections to nearly everyone in the cast, and the characters all seem to ascribe various acts performed by Gintoki to him, right down to [[BreakingTheFourthWall Gintoki discovering that the show's previous 5 years worth of episodes seemingly starred Kintoki instead]]. It's eventually revealed that Kintoki is an android who was originally built to act as a substitute for Gintoki while the latter was on vacation, but eventually began using subliminal hypnosis to take Gintoki's place in everyone's memories.
33	* Yashiro Isana in ''Anime/{{K}}'' is an interesting example in that even ''he'' remembers having been there all along. By the time of TheReveal half way through the first season, everyone who was made to Remember the New Guy has forgotten him, which is what leads him to realize his memories had been tampered with. Everyone in the school not only remembered him, they loved him enough to eagerly share their food with him every day.
34	* In ''Anime/MajokkoMegChan'', Meg is a young witch who has been sent to Earth where she's adopted by former witch Mami Kanzaki. In the first episode, Mami bewitches her husband and their two children, Rabi and Apo, into believing that Megu has always been the eldest child of the family.
35	* ''Anime/PuellaMagiMadokaMagicaTheMovieRebellion'' does this with Bebe a.k.a. Charlotte/Nagisa, Mami's pet witch. Mami claims to have adopted her long before meeting Madoka and Sayaka, and that they were inseparable ever since; but Bebe appeared only briefly in the original series, when she literally ''bit Mami's head off'', and then got blown up by Homura. She was never Mami's pet before the movie, but none of the characters can remember her being anything else. It turns out that Homura has manipulated the memories of most of the cast, including herself, and "Bebe" is only the tip of the iceberg.
36	* ''Franchise/SailorMoon'':
37	** Chibiusa hypnotizes Usagi's family into thinking she's a cousin who regularly stays with them. In the anime, this comes complete with a fake photo album. Granted, she [[KidFromTheFuture technically is related to them]]. Unlike most examples, we usually see this from the perspective of Usagi, who is completely aware something fishy is going on.
38	** Later, another little girl, going by Chibi-Chibi, assumes the identity of Usagi's younger sister. In the manga, she is Sailor Cosmos, who is an incarnation of Sailor Moon, though it's never really elaborated if she and Usagi are indeed the same person. In the anime, she's the Light of Hope in human form.
39	* ''Anime/SCryEd'' pulls an interesting version of this in regards to Ryuhou in the second half, after he's lost his memories and his former organization tracks him down. While he was implicitly already familiar with Kigetsuki's Alters, a trio of [[RidiculouslyHumanRobots almost-entirely-human beings]] called the Tokonatsu sisters, Unkei forces this trope on him by using ''his'' Alter, Mad Sprict, to implant false memories within Ryuhou and make him believe the Tokonatsu sisters were all his friends since childhood - complete with revisiting earlier flashbacks to Ryuhou's childhood when he first met Mimori, but with one of the three Tokonatsu sisters taking Mimori's place in the different flashbacks. Ryuhou is definitely ''not'' pleased when his memories actually return.
40	* In ''Manga/{{Servamp}}'', Mahiru believes he has been best friends with Sakuya since they were kids. In reality he has known him for only a year, and Sakuya is a vampire who created these fake memories to fit in with Mahiru and his other ChildhoodFriends. Mahiru remembers their real first meeting after the truth comes out.
41	* ''Anime/TenchiInTokyo'': Sakuya Kumashiro was created by the BigBad Yugi and inserted into the school Tenchi goes to in Tokyo, with all her classmates getting false memories of her. Since Tenchi was new in town to begin with he never had the opportunity to even suspect anything was different. Ultimately, once Yugi decided that Sakuya had [[YouHaveOutlivedYourUsefulness outlived her usefulness]], Sakuya was reabsorbed back into her and all the other students besides Tenchi forgot she'd ever existed -- she even disappeared from photographs.
42	* ''Anime/YuGiOhGX'': Season 4, where the characters are shown instantly treating the previously unknown Yusuke Fujiwara like he's one of the TrueCompanions all along -- because he's hypnotized them into thinking so. Too bad his magic doesn't work on Judai. It doesn't work on Fubuki, too, because Fubuki knew Fujiwara already.
43	* In ''Anime/YuGiOhTheDarkSideOfDimensions'', Diva uses Plana magic to insert himself into Yugi's graduating class as a student named Aigami, with the others having fuzzy memories of him but sure he'd been there for a while.
44	[[/folder]]
45
46	[[folder:Comic Books]]
47	* Creator/DCComics's Moon Maiden and Triumph, and Creator/MarvelComics's ComicBook/TheSentry. All three are modern characters retconned as heroes from UsefulNotes/{{the Silver Age\|OfComicBooks}} who happened to save the world in a way that [[LaserGuidedAmnesia erases everyone's memories of them]]. Leading up to the series that introduced the Sentry, Marvel got comic news sources in on the joke; they ran stories about how he really '''was''' a Silver Age hero who was created back then but never used and promptly forgotten. Nor was this the first time Marvel had tried this tactic. 3-D Man was made in the Seventies but his story had him as active since the Fifties. There was even a ''ComicBook/WhatIf'' story where he was present as a founding member of a '50s version of ComicBook/TheAvengers[[note]]this story would later inspire ''ComicBook/AgentsOfAtlas'', which consisted of the same team minus 3-D Man, but had his LegacyCharacter, the second 3-D Man, [[MythologyGag join up later]][[/note]].
48	* ''ComicBook/AdventureTime'': Finn and Jake destroy a magical statue and then discover that they now have an adopted sister, Gata, who is intimately familiar with everyone they know and has apparently lived with them for years. Gata was once actually their sister, but their father magically banished her to another universe and removed all memories of her existence after discovering she was an ApocalypseMaiden that created a portal to a dimension filled with powerful demons when she slept. The statue was the seal to that universe, and destroying it restored her to theirs. At the end, Gata decides to perform a HeroicSacrifice and re-banish herself and the demons (who are led by her birth mother). Finn and Jake instantly forget about her when she does so. This gets a BelatedHappyEnding at the end of the "Dungeon Master" arc, where the defeat of the villains of that storyline somehow strips her birth mother of her powers and allows Gata to safely exist again.
49	* ''ComicBook/TheAvengers'':
50	** This seemed to happen with Moonraker's sudden appearance in ''ComicBook/ForceWorks'' during''ComicBook/TheCrossing''. Everybody knew him and he even was in an ongoing relationship with ComicBook/SpiderWoman. However, Rachel (Spider-Woman's daughter) notices she had never seen him before. Some issues later, Moonraker reveals he was really implanted into the team's history via time travel to warn them and the Avengers about an upcoming attack by Kang -- and that he's really Libra, [[Characters/GuardiansOfTheGalaxyModern Mantis]]'s father. Much like everything else about ''The Crossing'', this was retconned to be a Space Phantom working for Immortus in ''ComicBook/AvengersForever'' and the real Libra was confused by the Avengers acting like Moonraker was him.
51	** A major plot point in the ''ComicBook/AvengersNoSurrender'' crossover involves the return of Voyager, a former Silver Age Avenger who was supposedly lost in time after a battle with the Squadron Sinister. It's eventually revealed that Voyager is really the Grandmaster's daughter, and that she used her powers to infiltrate the team by worming her way into everyone's memories, thus making them all believe she was a founding Avenger. She eventually does a HeelFaceTurn and restores everyone's memories voluntarily.
52	* ''ComicBook/{{Batgirl}}'': ''ComicBook/Batgirl2011'' introduced Babs's old schoolfriend Greg, who turns out to be a memory-warping villain called Fugue, who Babs had never met before. Possibly a bit of lampshading on how often RememberTheNewGuy is played straight in her stories.
53	* ''ComicBook/{{Captain Marvel\|MarvelComics}}'': When Genis-Vell went mad and helped destroy the universe, it was restored shortly afterward, but with slight changes: Genis discovered that he suddenly had a sister, Phyla, and apparently always had had one.
54	* ''ComicBook/{{Daredevil}}'': After the events of ''ComicBook/DaredevilCharlesSoule'' resulted in Mike Murdock, an identity Matt came up with as part of a FakeTwinGambit to throw Foggy and Karen off the trail of him being Daredevil and whose death he later faked, accidentally brought to life as a separate person by Reader, ''ComicBook/Daredevil2019'' saw him use a Norn Stone to give himself a real history, including not only being Matt's twin, but also having played a role in Matt's origin and their father Jack's death. The same spell also resulted in the creation of Butch Pharris, another son for the Kingpin, who was Mike's best friend.
55	* ''ComicBook/DoomPatrol'': Rachel Pollack's run had a character called the False Memory, who had the power to make people remember things that didn't really happen and used this to try and infiltrate the Doom Patrol by convincing them she was a longtime companion of theirs. The Doom Patrol are eventually convinced to stand up to the False Memory and get her to leave when Dorothy Spinner refuses to give in to her manipulations.
56	* ''ComicBook/TheFlash'': In ''ComicBook/DCRebirth'', the ComicBook/New52's version of Wally West was retconned to be a separate character from the original Wally West with ''ComicBook/TheButton'' and ''ComicBook/FlashWar'' later explaining that Wallace, as the New 52 Wally started going by, was the result of the {{Cosmic Retcon}}s [[ComicBook/{{Watchmen}} Dr. Manhattan]] had pulled on the DCU. Initially, ''Rebith'' had the original Wally mention that Wallace was a younger cousin and they were both named after the same grandfather. It wasn't until Wallace travelled to the 25th Century and learned from the Flash Museum the truth of his existence, seeing evidence that clearly indicated Wally ''never'' had a similarly named cousin in the pre-Flashpoint universe.
57	* ''ComicBook/{{Rogue}}'': In Rogue's short-lived solo series, Blindspot was retconned into being a friend of Rogue and a member of the Brotherhood, but since she has the power to manipulate memories, she was able to erase all knowledge of her existence after going into hiding.
58	* ''ComicBook/SecretAvengers'': One of the ''ComicBook/FearItself'' tie-ins to introduced Leonard Gary, a friend of Beast's with Omega-level RealityWarper abilities. Leonard is shown to be so powerful that he literally brings Washington D.C. to life to repel Red Skull's Neo-Nazi invasion, and yet we've never heard of him before. It is, however, justified since Beast implies that Leonard deliberately used his powers to hide himself from people like the ComicBook/XMen.
59	* ''ComicBook/SheHulk'': The 2014 comic revealed that the obscure 90s hero Nightwatch was originally a villain named Nighteater who'd used a spell that retroactively made everyone think he was a superhero.
60	* ''ComicBook/SonicTheHedgehogArchieComics'': Following the CosmicRetcon (and real-life lawsuit) that caused a ContinuityReboot, numerous characters showed up who had histories with the preexisting characters that were completely new to the audience. Possibly lampshaded in the case of Breezie the Hedgehog, whom Amy points out Sonic and Tails have never mentioned to the rest of the team before.
61	* In the ''Franchise/{{Transformers}}'' tie in mini-series of the IDW comics crossover event ''Infestation'', Galvatron has his loyal crew of Cyclonus, Scourge and... Bayonet, a female helicopter Transformer we've never seen before and is part of the crew. She is the BigBad Britt, disguised as a Transformer who used her powers to mess with everyone's memories to make them all believe that she was there all along. Kup, who's going crazy by this point, is the first to notice, and when trying to write it off as paranoia fails, she [[ImpaledWithExtremePrejudice impales him]].
62	* ''ComicBook/WonderWoman'' [[ComicBook/WonderWoman1942 Vol. 1]]: The Silver-Age/Earth-One ComicBook/SteveTrevor's second death cannot seem to be undone so the version of Steve from another universe is brought in and he and Diana's memories are altered to ensure there are no discrepancies. When they find out about this manipulation they both sever ties almost entirely with Paradise Island, though by this point Steve had been merged with what remained of the Earth-One Steve after another near death experience.
63	* ''ComicBook/XMen'': In ''ComicBook/XMenLegacy'', Forgetmenot's mutant power made people forget his existence the moment they stop actively thinking about him. He's apparently been an X-Men for six, in-story years.
64	[[/folder]]
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66	[[folder:Fan Works]]
67	* In ''Fanfic/HarryPotterAndTheNatural20'', Milo is a {{Munchkin}} with the standard ''TabletopGame/DungeonsAndDragons'' PlayerCharacter ability to add details to his backstory at will. So naturally, he exploits this trope for all it's worth.
68	-->"What did you do?" Relkin asked in a hushed voice.\
69	"I remembered each and every one of them as a treasured friend or relative from my backstory," Milo said quietly. "One who would never, ever raise a hand against me or impede the cause of Justice or the furthering of Good. And who gets +2 and a reroll against magical orders against their nature."
70	* In ''Fanfic/LongTermMemories'', original villain Spinel replaces Garnet and imposes fake memories on the other characters so that they believe she's always been there instead of her.
71	* ''WesternAnimation/MyLittlePonyFriendshipIsMagic'' fan works have done this a few times to lampshade the canon's heavy RememberTheNewGuy tendencies:
72	** ''[[https://www.fimfiction.net/story/344092/bbbcf BBBCF]]'' explains why Cadance and Shining Armor suddenly appeared at the end of season 2 by making Shining Armor a newly spawned changeling drone, with the whole wedding a contrived excuse to distract Chrysalis from Cadance's importance.
73	** In ''[[Fanfic/TheAlarmaverse Den Fjerde Vaeg]]'', some force from another universe is altering the past to insert new characters, and altering everypony's memories to match. Only the ponies with [[FourthWallObserver fourth wall awareness]] retain RippleEffectProofMemory. When Maud Pie pops into existence, Pinkie is a bit disturbed at suddenly gaining an older sister. When [[BrokenMasquerade Twilight Sparkle learns of the fourth wall]], she abruptly regains memories of being an only child, from before her older brother Shining Armor was retconned in.
74	** In ''Fanfic/PonyPOVSeries'':
75	*** It is eventually revealed that Shining Armor literally didn't exist before he was introduced, and once he appeared, the timeline adjusted itself both past and future to accommodate him. When he finds out, it's a TomatoInTheMirror moment for him.
76	*** During the Finale Arc, Button acts like he's always been Sweetie Belle's coltfriend and the Crusaders' SixthRanger. However, this is because from his perspective, it really ''had'' always been that way.
77	*** Also during the Finale Arc, Maud Pie is really the [[AmnesiacGod amnesiac]] avatar of Entropy, the Goddess of Nothingness and Endings. Upon her arrival, characters briefly question who she is before their memories are rewritten so that they believe she is Pinkie Pie's older sister. As Maud doesn't remember being Entropy and only remembers being Maud, she genuinely believes she is Pinkie Pie's older sister.
78	** In ''Fanfic/AWitchInBroadDaylight'', [[spoiler:Scootaloo]] possesses a [[RealityWarper reality distortion field]], which she uses to retroactively make herself [[spoiler:Rainbow Dash's little sister]]. It only works within ten miles of her, but everyone within its radius acts as though things have always been that way, while those who exit its range reverts to normal, recalling nothing about their modified memories.
79	* Late in ''Fanfic/PerfectionIsOverrated'', Bachiko is introduced as a supposed childhood friend of [[Anime/MyHime Mai]], and it's claimed that Mai has also known Bachiko's best friend Meiko when she first arrived at Fuuka. Natsuki is confused when Mai and the others assume she knows the two when she knows she doesn't. It turns out that Meiko, using her powers, altered everyone's memories so that they would remember herself and Bachiko as their friends, as part of an EvilPlan to manipulate everyone's relationships as they see fit with Bachiko's personality altering abilities, and they posed as Mai's friends in order to monitor their progress. Natsuki happened to be outside of Fuuka's campus at the time, and so was not affected by Meiko's power.
80	* Done InUniverse in ''Literature/TheVampireDiaries'' story ''Return to Mystic Falls'' by Elena, who is really Katherine. She had a witch make people think she had been there all along to fool people, [[EspeciallyZoidberg especially Stefan]].
81	[[/folder]]
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83	[[folder:Film -- Live-Action]]
84	* ''Film/{{Dark City\|1998}}'': A heroic example in the climax, wherein the protagonist Murdoch receives a memory altering injection that is his current set of memories with the addition of a supporting character sometimes assuming roles like a fireman, postman, or teacher that tutor him on his psychic powers. It's effective enough to grant instant mastery to the point of being on equal footing to the antagonistic aliens that used to be the only ones with this power.
85	* In ''Film/KamenRiderSaberTrioOfDeepSin'', Mamiya used the Amazing Siren Wonder Ride Book to write himself into Touma's life as his second childhood friend.
86	* ''Film/MenInBlack3'': After Boris alters the timeline by going back to 1969 to kill K, J gets on the elevator to go to work and he is joined by another agent, AA, who addresses J as if J is his partner. Neither J nor the audience has ever met this guy before, much less been partnered up with him. J naturally knows something's wrong.
87	[[/folder]]
88
89	[[folder:Literature]]
90	* ''Literature/TheCampHalfBloodSeries'':
91	** In the series, the [[WeirdnessCensor Mist]] can be manipulated to create FakeMemories of a person. For example, in the first book of ''Literature/PercyJacksonAndTheOlympians'', after Mrs. Dodds (Percy's teacher and a servant of Hades) attacks Percy and is killed, a new teacher named Mrs. Kerr mysteriously appears to take her place, and nobody but Percy remembers that Mrs. Kerr hasn't always been their teacher.
92	** This is also used in the SequelSeries, ''Literature/TheHeroesOfOlympus'', to get Jason's classmates to think that he has always been in their class. Leo Valdez believes that Jason was his best friend, and Piper [=McLean=] even has memories of dating Jason.
93	* In ''Grinny'' by Creator/NicholasFisk, the title character has this as an explicit power: by saying "You remember me", she can make adults (but not children) think they've known her all their lives.
94	* In ''Literature/InCryptid'', this is the Johrlac ("cuckoo") modus operandi. They're a species of powerful, [[BewareTheMindReader sociopathic telepaths]] who use their powers to ingrain themselves into their victims' lives, making them believe they'd always been there as a member of their family, before draining them of all resources.
95	* The ''Literature/{{Torchwood}}'' novel ''Border Princes'' by Creator/DanAbnett (published between series 1 and 2) has pretty much exactly the same plot as the episode "Adam" (below), except it's a RealityWarper, rather than a memory-alterer, and he isn't doing it intentionally.
96	[[/folder]]
97
98	[[folder:Live-Action TV]]
99	* In ''Series/{{Angel}}'', Connor inverts the trope by being given fake memories of a normal life, so that no one except Angel and Cordelia remembered his true identity. However, to his new family, who also had memories of him implanted in their minds, he plays this straight, though unintentionally, as he did not consent to Angel having done this to him or them. He's just as clueless as they are, at least at first. The Beast's introduction also has shades of this, because [[SuperpoweredEvilSide Angelus]] remembers him but Angel (and thus the audience) doesn't.
100	* ''Series/BuffyTheVampireSlayer'': One of the most significant examples is the case of Buffy's little sister Dawn, whom everyone treated as always being around despite only debuting in the fifth season. She actually ''didn't'' exist before her first appearance; she's really a cosmic key between dimensions, [[MacGuffinTurnedHuman transformed into a human being]] in order to hide her from a demon goddess. The monks who transformed her also [[FakeMemories created memories of her in everyone's minds]] to ensure that she has the Slayer to protect her. The trope goes far enough that Dawn is referenced on ''Series/{{Angel}}'', the spin-off show she never appeared on, because Angel himself (and Cordelia and possibly Wesley, for that matter) would have met Dawn in the first season of ''Buffy''. She also appears in comics and novels set before the fifth season, on the grounds that the characters would have remembered her being there even though she wasn't there before. When a ''Buffy'' animated series, set during their high school years, was in development, Dawn was planned as a main character.
101	%% Note that Jonathan's actions in "Superstar" are not an example, as he was an established recurring character already.
102	* ''Series/TheFlash2014'':
103	** In season three, various alterations to the timeline result in (among other things) Barry having a new co-worker at Central City forensics. Barry is the only one with RippleEffectProofMemory, so only he finds this odd.
104	--->'''Barry:''' How have I been working with [[{{Jerkass}} this guy]] for a year?\
105	'''Joe:''' You say that all the time.\
106	'''Barry:''' I'm sure I do!
107	** When Professor Stein visits during the "Invasion" crossover, he discovers that, due to advice he gave his past self [[Series/LegendsOfTomorrow on his own show]], he has a fully-grown daughter with an entire life story he doesn't remember.
108	* Parodied in ''Series/{{Scrubs}}''. New character Kim Brigs is introduced as a new character, only for Turk to explain to JD that she's been at the hospital literally as long as they have. A montage ensues of Kim composited into scenes from earlier seasons where she wasn't actually there. The excuse for this? Women wearing wedding rings are literally invisible to JD.
109	* ''Series/StargateSG1'': "[[Recap/StargateSG1S5E4TheFifthMan The Fifth Man]]" starts with SG-1 having to leave Jack and new member Lt. Tyler behind as they flee a bunch of Jaffa. When they get to the SGC and say that Tyler was injured, Hammond says, "Who?" Tyler eventually comes clean that he's an alien whose species secretes a pheromone that makes others perceive them as a familiar (even if fictitious) and trusted figure. Since he was on the run from their mutual enemies and didn't mean the team any harm, they let him go. In later episodes, they reverse engineer the memory-altering compound to infiltrate enemy organizations.
110	* ''Franchise/StarTrek'':
111	** ''Series/StarTrekTheNextGeneration'':
112	*** Played with in Tasha Yar during the AlternateTimeline in "[[Recap/StarTrekTheNextGenerationS3E15YesterdaysEnterprise Yesterday's Enterprise]]", in which she insists that she's always been good friends with Guinan. Guinan, of course, never met Tasha in the original timeline because she died a year before Guinan joined the crew, and thanks to her species's RippleEffectProofMemory, instinctively knows this is untrue.
113	*** In "[[Recap/StarTrekTheNextGenerationS4E8FutureImperfect Future Imperfect]]", Riker goes on an away mission when he falls unconscious and when he wakes up, he's informed that it's 16 years into the future and he's now the captain of the ''Enterprise'' with a teenaged son. However, he sees that this is an illusion when he discovers that his late wife "Min" was actually Minuet, the holographic character from the season 1 episode "[[Recap/StarTrekTheNextGenerationS1E1411001001 11001001]]", and it's revealed to be a Romulan simulation. Then, he discovers that's ''also'' an illusion by Barash, a lonely alien boy on the planet that Riker and the away team were surveying.
114	*** In "[[Recap/StarTrekTheNextGenerationS5E14Conundrum Conundrum]]", the entire crew is hit with amnesia and forget who they are. While looking up their identities and ranks in the ship's computer, everything looks fine until it lists the First Officer as being Lt. Keiran [=MacDuff=], someone the audience has never met before. Turns out he is an alien intruder, trying to trick the ''Enterprise'' into attacking the enemies of his species.
115	** Quite a clever example appears in the ''Series/StarTrekVoyager'' episode "[[Recap/StarTrekVoyagerS5E11LatentImage Latent Image]]" when the Doctor (''Voyager'''s Emergency Medical Hologram and acting chief medical officer) finds evidence of [[RedShirt crew member Ahni Jetal]], whom he cannot remember ever being on ''Voyager''. It turns out that his memories of her were deleted by Captain Janeway after he failed to save Jetal's life because he chose to prioritize saving someone else's, an event [[HeroicBSOD too traumatic]] for [[LogicBomb his programming to take]]. Considering that she really had never appeared on the show before, a possible reading is that the entire series up until that point reflects the EMH's edited memories and Jetal could have been around and involved in major plot points.
116	* ''Series/{{Torchwood}}'': [[Recap/TorchwoodS2E5Adam "Adam"]] is all about this. Gwen enters the Hub one day to find the titular New Guy working like he's been there all along. She's never seen him bef- Oh, wait, [[RememberTheNewGuy of ''course'' she has]]. The New Guy is actually an extra-dimensional entity that implanted himself into everyone's memories because he has to be remembered to exist. They even did a SpecialEditionTitle sequence that implanted the mysterious new guy.
117	* ''Series/TheTwilightZone1959'': In "[[Recap/TheTwilightZone1959S2E8TheLatenessOfTheHour The Lateness of the Hour]]", a wealthy, reclusive couple's android servants have implanted "memories" and are programmed to believe that they have been in their positions for years. All hell breaks loose when the couple's grown daughter figures out that this applies to her too.
118	* ''Series/TheXFiles'': Inverted in the episode "[[Recap/TheXFilesMiniseriesE10TheLostArtOfForeheadSweat The Lost Art of Forehead Sweat]]", about various false memory syndromes including repressed memories and the Mandela Effect. Reggie, the guy who tells Mulder and Scully about the memory conspiracy, insists he's known them for years, and eventually claims to have founded the X-Files, but nobody apart from him remembers this because he's being erased. He turns out to probably just be crazy. Or is he?
119	-->'''Skinner:''' Hey, where are they taking Reggie?
120	[[/folder]]
121
122	[[folder:Video Games]]
123	* Akasha in ''VideoGame/DragaliaLost'' mysteriously convinces the main characters that she's a long-lost friend of theirs. Heinwald suspects she's implanted fake memories, but Akasha claims she merely encouraged memories of their encounters in past lives and future possibilities.
124	* Invoked and lampshaded in ''VideoGame/FireEmblemFates''. ''Hidden Truths'' reveals that Anankos's good side had actually given false backstories to Inigo, Severa, and Owain when he took them to his world. Since their backstories involve them having earned enough of a reputation in the world to serve the royal family, it's implied that Anankos possibly warped peoples' memories around to account for their presence in the world. Xander, however, points out in his C support with Laslow that he does find it odd that he has never even heard of Laslow before he was appointed as his retainer, but he will not [[PragmaticHero question the results]].
125	** Niles provides an additional lampshade in his supports with Selena, pointing out that they may as well have appeared out of thin air before they started serving the Nohrian royal family.
126	* In ''VideoGame/KingdomHeartsChainOfMemories'', Sora is subject to Castle Oblivion's memory-altering shenanigans, and as he slowly loses some memories, others that he had forgotten come back to him. Through this, he's reminded of his one-time friend Naminé, and as time goes on, he speaks of Naminé more and more, even though she did not appear in his hometown in the first ''VideoGame/{{Kingdom Hearts\|I}}'' and was never mentioned previously. Eventually, he manages to ''completely forget'' about his actual childhood friend Kairi, whom Naminé seems to have supplanted in his memories... and there's actually good excuse for all this! He's actually never met Naminé before at all, and the Castle's supposed powers were a ruse; Naminé was being coerced by Organization XIII into using her unique ability to tamper with Sora's memories in order to serve their own interests. This was probably made easier by Naminé being Kairi's Nobody.
127	[[/folder]]
128
129	[[folder:Visual Novels]]
130	* In ''Miniature Garden'', Sumika is introduced after everyone wakes up in the school as one of Yasunari and Ayana's friends. In her route, it's discovered that Sumika is in reality the ghost of a girl that was killed decades prior by the school and who first possessed Ayana's doll before becoming tethered to the school. Her presence also turns out to be the cause of the supernatural aspects of the story.
131	* We actually see the final stages of this process early in ''VisualNovel/{{Tsukihime}}'', as Ciel completes her integration into Shiki's school community, and he has trouble "remembering" her at first, until she "reminds" him of their previous meetings. In reality, Ciel is an agent of TheChurch who has arrived in town to pursue an ancient vampire connected to Shiki's family, so she has been using magic to insert herself into his and his classmates' memories.
132	[[/folder]]
133
134	[[folder:Webcomics]]
135	* Right before ''Webcomic/{{Asperchu}}'' went on permanent hiatus, there was a story arc starting where someone had messed about with time travel and the PowerTrio of Asperchu, Max and Jivin suddenly had a fourth member, a [[PrettyFlyForAWhiteGuy pretty fly white guy]] named Groovan. It seemed like Asperchu might have been somehow aware that Groovan shouldn't be there, but the strip ended only a few strips afterwards before the situation was expanded on.
136	* In ''Webcomic/CaseyAndAndy'', the guest strips by Rob Petrone (starting [[http://www.galactanet.com/comic/view.php?strip=492 here]]) feature Rob insidiously inserting himself into the title characters' lives (and the title). [[http://www.galactanet.com/comic/view.php?strip=501 It doesn't end well for him.]]
137	[[/folder]]
138
139	[[folder:Web Original]]
140	* ''Website/SCPFoundation'': "Ramos", the subject of [[https://scp-wiki.wikidot.com/uiu-file-2021-121 UIU File: 2021-121]], can control people's memories to make them think he's a friend, coworker, family member or otherwise someone they know and trust.
141	[[/folder]]
142
143	[[folder:Western Animation]]
144	* In Season 5 of ''WesternAnimation/TheAdventuresOfPussInBoots'', the episode "The Iceman Melteth" suddenly features a new orphan, Li'l Pequena, who appears in five episodes before "Remember Me Not" reveals she's a fairy who can implant FakeMemories, and an agent (or, as it turns out in the season finale, mind-controlled slave) of the Blind King. Dulcinea grows suspicious when she realises Toby's pictures don't include her, and we see her altering Puss's memories so that she was the first person he met in San Lorenzo, and Dulcinea's so that she'd been popping up all through the series insisting they were best friends. And when that doesn't work, she alters everyone's memories to believe ''Dulcinea'' is a monster from the Netherworld...
145	* ''WesternAnimation/TheAmazingWorldOfGumball'':
146	** "[[Recap/TheAmazingWorldOfGumballS3E7TheName The Name]]" mixes this with SelfServingMemory: [[SplitPersonality Zach]] changes Gumball's memories to turn his failures into spectacular successes to erase his original personality and [[SplitPersonalityTakeover take his place]].
147	** "[[Recap/TheAmazingWorldOfGumballS4E4TheOthers The Others]]" inverts this by introducing a few new characters this way. Since Gumball is so self-centered that he believes the entire world revolves around him, he and Darwin (and thus, the audience) only ever saw the students of their own class... and Anais who is a year above her brother and half-brother. After [[https://www.youtube.com/watch?v=UHknXuwuWJU&t=45 opening their minds]], Gumball and Darwin realize that there are dozens of students and several faculty members that they never noticed before.
148	* In ''WesternAnimation/Ben10AlienForce'', Kevin's father, Devin, was retroactively added in as a postmortem character from Grandpa Max's past. But ''WesternAnimation/Ben10Omniverse'' retconned this again by revealing Devin never really existed in the manner portrayed in Alien Force. It was a fake memory implanted in Max's mind by the Rooters during the year before Alien Force occurred.
149	* This was going to be one of the main points of the failed ''Series/BuffyTheVampireSlayer'' animated spinoff. The show would retell the Scooby Gang's high-school years, with the addition of Dawn Summers, who was intentionally retconned into the fifth season of the show as a plot point, but had not appeared prior to that. Unfortunately, the show was never made.
150	* The ''WesternAnimation/RickAndMorty'' episode "[[Recap/RickAndMortyS2E4TotalRickall Total Rickall]]" has the family become infested by alien parasites that breed via fake memories and take the form of wacky characters. This starts off with parodies of typical sitcom characters such as Uncle Steve and Cousin Nicky and eventually spirals into the house being filled with all sorts of fantastical characters. Most prominent is Mr. Poopybutthole, who is not only there from the start, but is also edited into the intro. Eventually, they realize that the parasites can only create happy memories and that the real ones are the people they have horrible memories of. However, Mr. Poopybutthole turns out to be real; he ''really'' is just that great of a guy. Unfortunately, the family learns this in the worst possible way when Beth shoots him.
151	* ''WesternAnimation/SouthPark'': Parodied in "[[Recap/SouthParkS7E7RedMansGreed Red Man's Greed]]", when a random kid with "ALEX" written on his shirt appears in multiple scenes, each time giving a generic line any other character could have said. It takes until the very end of the episode for anyone to comment on it:
152	-->'''Stan:''' Dude, who the hell are you?!\
153	'''Alex:''' Alex. Alex Glick. [[ContestWinnerCameo I got to come on and do the guest voice thingy]].\
154	'''Kyle:''' What?! Get the hell out of here!\
155	'''Alex:''' ''[exiting]'' [[HiMom Hi Mom! Hi Dad! Hi Jill!]]
156	* ''WesternAnimation/TeenTitans2003'': Mother Mae-Eye from [[Recap/TeenTitansS4E10MotherMaeEye her eponymous episode]] is a witch who successfully brainwashes the Titans into believing she's always been their caretaker.
157	[[/folder]]

Context Main / BackstoryInvader