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9[[quoteright:350:[[ComicStrip/CalvinAndHobbes https://static.tvtropes.org/pmwiki/pub/images/calvinselves.png]]]]
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11As described in ''Literature/UpTheLine'', by Creator/RobertSilverberg, in some versions of time travel, if the same person visits the same event more than once, duplicates of that person remain. For example, if our hypothetical time traveler goes to, say, JFK's assassination five times, somewhere in that crowd will be five instances of our time traveler.
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13There's a good chance that the duplicates will interact with each other during the encounter. One common event is for a "later" duplicate to try to cause an "earlier" duplicate to do something (or prevent them from doing something) because they remember what will happen. Alternatively, directly interacting with each other poses great risks, so the "later" duplicate will try to abide by NeverTheSelvesShallMeet.
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15In contrast to this trope, some works do have a "temporal exclusion principle" that prevents you from visiting a specific time more than once so time travel paradoxes can't occur; OnlyOneMeAllowedRightNow.
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17Distinct from MyFutureSelfAndMe in that it's not simply about different temporal versions of a person meeting each other, but multiple instances of time travel creating duplicates in the same time period. To be clear, in MyFutureSelfAndMe, past and future selves ''temporarily'' coexist in the same time, but the earlier versions must eventually become the later versions, so there will once again be only one version of the person after the whole thing. This trope eliminates that requirement, allowing for ''permanent'' duplicates to be created through time travel.
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19Used as a gameplay element in some video games.
20
21----
22!!Examples:
23[[foldercontrol]]
24
25[[folder:Anime and Manga]]
26* Kurumi Tokisaki from ''Literature/DateALive'' is able to create duplicates of herself using Zafkiel's Time Master powers.
27* In one early ''Manga/{{Doraemon}}'' chapter, Nobita tricked Doraemon into doing his homework. Doraemon then got the idea to use the time machine ask ''four'' of his future selves so he can finish it five times as fast. Unfortunately, since for the most part the series runs on StableTimeLoop, this basically means he's doing the homework for five times. The final future self snapped.
28* In ''Anime/DragonBallZ'', Trunks came back in time from a BadFuture to warn Goku about the Androids and give him a cure for the heart virus that killed him in his timeline. After a present-day version of him was born, the future version returned to help in the fight against the androids and Cell. From then on, Future Trunks's timeline coexists with the main timeline, so there are two Trunkses.
29** Later in ''Anime/DragonBallSuper'', the present Trunks gets to meet Future Trunks. Three versions of Zamasu also coexist, the present-day version who Beerus went back in time to kill before he killed Gowasu, the version from Future Trunks's timeline, and the version from the original timeline who did kill Gowasu and became Goku Black. After the future timeline is erased, Future Trunks and Future Mai traveled to an earlier point in the future timeline before Goku Black showed up to create a new future timeline to live in, even though this means there will be another Trunks and Mai aleady living in that timeline.
30* ''Manga/EdensZero'' features a SpacetimeEater called the Chronophage that eats the time of planets, causing those planets' histories to regress up to thousands of years into the past, which effectively creates a duplicate of everyone and everything that was on that planet at that time but not when the Chronophage showed up. In the case of planet Norma, which regressed by 50 years, two versions of Weisz Steiner that are able to co-exist: the older present-day version, and a younger version from 50 years ago.
31* In ''Literature/HumanityHasDeclined'', the fairies trap the protagonist in a time loop which creates several dozen copies of her to make sweets for them.
32* During the Mahora Fest arc in ''Manga/NegimaMagisterNegiMagi'', Negi uses a portable time machine given to him by Chao to be able to spend time with all of his students (going through the same three days over and over again). The first time he uses it, he and Setsuna see multiple future copies of him going about enjoying themselves. None of the copies ever interact with each other.
33[[/folder]]
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35[[folder:Comic Books]]
36* Creator/MarvelComics:
37** Flashback, from ''ComicBook/AlphaFlight'', has this as his trademark superpower, where he uses his psionic power to summon versions of himself from the future. These future Flashbacks are all under the present day version's control and rely strictly in [[MesACrowd power in numbers]] to overwhelm an enemy.
38** Quicksilver, from ''ComicBook/TheAvengers'', at one point lost his SuperSpeed and in place received TimeMaster powers where he was able to displace himself from time and jump into the future, which in turn allowed him to summon several time-displaced duplicates of himself.
39** Also in ''ComicBook/TheAvengers'', there was a minor continuity snag with the Vision, since it was stated that his body is repurposed from the android [[ComicBook/TheInvadersMarvelComics Human Torch]], particularly once the Torch was brought back as active in the present. Eventually, it's explained that Immortus manipulated time to duplicate the Human Torch's body so that Ultron could adapt the copy into the Vision.
40** ''ComicBook/{{Venom|2021}}'' (Vol. 5):
41*** Eddie Brock accidentally creates a number of temporal duplicates of himself due to his status as a King in Black--including the bloodthirsty Bedlam (embodying Eddie's all-consuming rage when he first became Venom), and the callous and arrogant [[BigBad Meridius]].
42*** When confronted by Eddie Brock, Bedlam, and Doctor Doom, Kang the Conqueror creates three temporal duplicates of himself--noted by Doom to be a common strategy of his--only to stand back and watch as one is eaten by Bedlam and another blown up by Doom. He then deactivates his third clone's force-field so he can be eaten by Bedlam, gloating that he now has three whole new Kang-less timelines to conquer.
43* In ''ComicBook/{{Irredeemable}}'', the character of Mallus can induce this by punching someone and sending them back in time. [[spoiler:Qubit harnesses this by amplifying it, allowing him to gather several time-displaced Qubits to make a teleportal machine to escape Genhom]].
44* ''ComicBook/WonderWomanOdyssey'': The version of Franchise/WonderWoman starring in the issue meets a version of her from a different future. [[spoiler: The [[ComicBook/WonderWoman1987 regular Post-Crisis Wondy]] was killed and possessed by Nemesis, and is trying to corrupt the younger version of herself who was saved from that fate by Clotho weaving a different fate and messing with the timeline.]] In the end the two versions of Wondy from diverging timelines merge into one.
45[[/folder]]
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47[[folder:Comic Strips]]
48* ''ComicStrip/CalvinAndHobbes'': One arc that involves Calvin trying to get out of doing his homework has him use his time machine at 6:30 PM and jump two hours ahead (along with Hobbes) to pick up the finished paper. Naturally, 8:30 PM Calvin doesn't have anything because two hours prior he went to the future instead of writing it. 6:30 and 8:30 decide that it must be 7:30 Calvin's fault and go to him to demand the paper, but he weasels out of it by pointing out that any pain inflicted on him will be shared by 8:30 Calvin. 6:30 and 8:30 Calvin return to 8:30 to find that both their respective times' Hobbes have collaboratively written the paper (which, much to Calvin's horror, is about how silly the whole thing is, although he did get an A+).
49[[/folder]]
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51[[folder:Fan Works]]
52* In ''Fanfic/ChildOfTheStorm'', Doctor Strange, an incredibly powerful TimeMaster, does this quite frequently during crises to ensure that he has everything, everywhere, covered. He hasn't been seen to interact with himselves, though.
53* Mention is made of this in ''Fanfic/TheOddsWereNeverInMyFavour'' with the Exchequer's early experiments with time turners. Unfortunately, due to a lack of safety precautions, having two of the same person at the same moment in time drove both of them mad, and they started using the time turners to make more and more of themselves, all of them insane and rampaging. It took considerable effort to put all of the rampaging Pawn down, and nowadays they have more failsafes in their time machines, including a hard limit on how many times one can go back to a specific moment.
54[[/folder]]
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56[[folder:Films -- Animation]]
57* One of the villains at Villaincon in ''WesternAnimation/{{Minions}}'' used a time machine to bring back his future selves to the present and form a bit of a "one-man work crew". But then one of the future versions accidentally killed the original, causing the rest to run around screaming before vanishing in a puff of smoke.
58* Each time The Big Bad Wolf's attempt to revisit the past in ''WesternAnimation/ReduxRidingHood'' end in failure, he ends up bringing his past self along with him. The Wolves constantly argue with each other following each disastrous attempt to go back to the past and the short ends with the multiple Wolves stuck living with each other as a result of his wife stealing his time machine.
59[[/folder]]
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61[[folder:Films -- Live-Action]]
62* Austin fails to save Felicity near the end of ''[[Film/AustinPowers Austin Powers: The Spy Who Shagged Me]]'', so he takes the time machine and sends himself back ten minutes. When he encounters his past self, he explains "You're me ten minutes ago." At the very end, present Austin catches Felicity in bed with past Austin who says that it's technically not cheating.
63* ''Film/BackToTheFuturePartII'':
64** In order to prevent Old Biff from giving his younger self the Almanac, Doc Brown and Marty [=McFly=] go back to 1955 to take it back without the older Biff knowing. They are very adamant on [[NeverTheSelvesShallMeet not interacting with their past selves in any way]].
65** As ''Film/BackToTheFuturePartIII'' reveals, there was a point in 1955 that ''four'' versions of the same [=DeLorean=] time machine existed in Hill Valley at once. The first movie's [=DeLorean=], the one Old Biff briefly stole, the one Doc and Marty used to stop him (due to travelling to a point where Old Biff was in the past) and finally the oldest version, [[TheSlowPath which Doc hid after being stranded in 1885 so Marty and 1955!Doc could fix it up and use it to get Marty home]].
66* In Disney's ''Film/TheKid2000'', the main character is visited by himself as a little kid, and later, they both meet their even older selves.
67* In ''Film/StarTrek2009'', Ambassador Spock implies to the AlternateTimeline Jim Kirk that it would cause a paradox if he were to meet his counterpart Commander Spock, but he introduces himself to him during the denouement anyway, admitting deceiving Kirk.
68* The film ''Film/{{Looper}}'' has its plot revolve around a hired gun who executes people sent from the future...who just got sent his final kill: himself.
69* ''Film/SeeYouYesterday'': Claudette and Sebastian try really hard to avoid any mishaps that could happen due to this.
70[[/folder]]
71
72[[folder:Literature]]
73* Creator/RobertHeinlein short story "Literature/ByHisBootstraps". Because of time travel, there are three different versions of the same person (at different points in their lifespans) in the same place at the same time.
74* ''Literature/{{Discworld}}''
75** ''Literature/{{Pyramids}}'': In order to make sure the pyramid is built on time, the builders reluctantly use a form of time travel (pyramids mess up time around them, changing the speed, looping or even reversing time) by having multiple instances of workers on the same job. This being the Disc, the workers immediately recognize the potential of getting paid multiple times for the same job (another has problems when he sees himself with his wife and doesn't know if it counts as cheating or not).
76** One of the characters in ''Literature/ThiefOfTime'' is a [[SemiDivine child of Time]] itself that was accidentally born twice due to the trauma of the birth. The two ended up living very different lives from each other before crossing paths in adulthood.
77* ''Literature/HarryPotter'': After a failed attempt to rescue Buckbeak the hippogriff, Harry and Hermione end up running from Lupin, who's involuntarily transformed into an aggressive werewolf. As they're surrounded by Dementors, Harry briefly sees what he's certain is his father's ghost in the distance, summoning a Patronus to distract them. Then they use the Time-Turner to return an hour earlier, with Hermione insisting how important it is that they don't run into each other (until staying hidden to avoid a paradox becomes much less important than being found by a werewolf). As Harry keeps looking for his dad to save his past self (with three of the four Marauders present that evening, including one who was previously thought dead, it wasn't much of a stretch), it finally strikes him that he'd seen himself cast the Patronus, and does so.
78* Referred to in the title of David Gerrold's ''Literature/TheManWhoFoldedHimself''. The first thing Daniel does with his "timebelt" is to travel forward 24 hours to meet his day-older self. After that, he spends a ''lot'' of time with his temporal duplicates, including a party attended by dozens of his past, present, and future selves.
79* In Creator/PoulAnderson's novel ''There Will Be Time'', Jack Havig is a natural time traveller and at a very young age he defeats a school bully in a fight by temporally duplicating himself many times. In a later scene, he fights a group of natural time travellers and they all use the same temporal cloning technique.
80* In ''Literature/TheTimeTravelersWife'', Henry (the time traveler) mentions that since he keeps traveling back in time to his mother's death, the scene is filled with copies of him.
81* Happens frequently in ''[[Literature/{{Magic20}} Magic 2.0]]'', as time travel is as easy as teleportation to anyone with access to the file. In book 2, for example, it's established that two versions of Brit coexist in {{Atlantis}}: the one who built the city (Brit the Elder) and the one who has yet to go back in time and build the city (Brit the Younger). Neither is particularly fond of the other. Book 5 has multiple versions of characters interacting and also adding Brit the Much Elder (who lives in the 21st century) and [[spoiler:is Miller and Murphy's boss]]. At one point, some of the characters are forced to fight their future selves. When asked why they're doing it, their future selves explain they're simply closing a StableTimeLoop, meaning they ''have to'' fight. By the time the fight is over, the younger versions are eager to pay themselves back for getting their asses kicked and are itching to close the loop themselves, while a version of Brit has made a video recording of the fight in order to spend the next several months rehearsing it with the guys in order to make sure they follow the script exactly.
82* In ''Literature/HyperionCantos'', the Shrike can pulls this off by calling multiple copies of itself from different points in the timeline.
83[[/folder]]
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85[[folder:Live-Action TV]]
86* In ''Series/AgentsOfSHIELD'', after the rest of the team are transported to the future, Leopold Fitz decides to take TheSlowPath to go after them by cryogenically freezing himself aboard a spaceship. After everyone returns to the present, there are now two Leopold Fitzes in the present, one who came back from the future, and one still frozen aboard the ship. After the team break the StableTimeLoop and change the future, the Fitz from the future dies, so the team decide to go out into space to retrieve the present Fitz from the spaceship.
87* ''Series/TheColbertReport'': In a Creator/StephenColbert animated segment of Tek Jansen, multiple Jansens appear; mostly one after the other, but a few interact with each other including killing one another.
88* ''Series/DoctorWho'':
89** The Doctor has used his TARDIS several times to join forces with himself in order to handle a problem that only one of him couldn't handle. Most of these instances limits himself to only one of him from each "regeneration", though, so this may count as [[PlayingWithATrope playing with the trope]] as each regeneration has an altered personality [[TheNthDoctor and appearance]]. However there have been occasions when multiple Doctors from the same regeneration have popped up, such as the Eleventh Doctor in "[[Recap/DoctorWhoS31E13TheBigBang The Big Bang]]", where the Doctor abuses a Vortex Manipulator to hop around and ends up running into versions of himself from the recent past and future.
90** "[[Recap/DoctorWhoS27E8FathersDay Father's Day]]" has Rose ask the Doctor to take them back in time to when her dad got hit by a car so she can be at his side when he dies. But she bottles out after seeing her dad get hit and runs away from the scene. So she asks the Doctor to take her back to the moment again. The Doctor does so, and Rose and the Doctor see themselves from when they traveled the first time. Then Rose creates a TemporalParadox by saving her dad in front of her and the Doctor's past selves...
91** A couple of stories establish the "Blinovitch Limitation Effect", which means that bad things happen if different temporal versions of the same individual make physical contact. See especially "[[Recap/DoctorWhoS20E3MawdrynUndead Mawdryn Undead]]" and "Father's Day". This doesn't seem to apply to different regenerations of the same Time Lord.
92* On ''Series/TheFlash2014'', this concept is referred to as "time remnants", where the duplicate is considered the remnant of a previous aborted timeline which was preserved by the Speed Force.
93** This is practically Zoom's SignatureMove, where he abuses time remnants in order to be in ''two places at once'' to manipulate or even mess with his enemies.
94** Eobard Thawne is known to utilize this trick too. In "Aruba" he summons an [[MesACrowd army of time remnants]] to battle the Legends. Later in "Legacy", he creates one extra time remnant to battle both the Flash and XS simultaneously, although this one may be Thawne's own signature move - appearing in two places at the same time by moving really fast, since they end up merging at the end.
95** Barry Allen learns this technique from Zoom and uses it to perform a HeroicSacrifice to destroy Zoom's DoomsdayDevice. It later comes to bite him hard when in a Bad Future, Barry gets driven to the DespairEventHorizon and creates an army of time remnants to battle Savitar after he killed Iris, only for Savitar to kill every time remnant but one [[StableTimeLoop which ended up]] [[ParadoxPerson becoming Savitar himself]].
96* In the Creator/{{PBS}} miniseries ''Genius by Stephen Hawking'', [[UsefulNotes/StephenHawking Professor Hawking]] points to this idea in a thought experiment as a reason for why TimeTravel violates the laws of physics. The logically required temporal duplicates (there would be two, one from you traveling backwards in time, the second from you traveling forwards again once you stop going backwards) violate the Law of Conservation of Mass, since the atoms making up both your bodies have to come from somewhere; they cannot just zap into existence or nonexistence.
97* In the ''Series/MysteryScienceTheater3000'' episode "[[Recap/MysteryScienceTheater3000S08E21TimeChasers Time Chasers]]", Tom and Crow decide to send Crow back in time to convince Mike not to continue working as a temp and pursue his dreams of becoming a rock star. This results in him dying onstage and his lout of a brother Eddie taking his place on the Satellite of Love. Crow then goes back in time again to convince his past self not to talk Mike out of his current timeline. When Mike tells this story to Pearl at the end, she points out that the first Crow never returned to the present.
98* The ''Series/StarTrekDeepSpaceNine'' episode "[[Recap/StarTrekDeepSpaceNineS03E17Visionary Visionary]]" has a time-traveling Miles O'Brien meet a version of himself from a few hours in the future, leading to the immortal line, "I hate temporal mechanics..."
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101[[folder:Tabletop Games]]
102* ''TabletopGame/Warhammer40000'': Waaagh! Grizgutz ended after the Warp brought the Waaagh! back to its starting point, just before it set off into the Warp. During the inevitable battle, Warboss Grizgutz fought and killed his past self in order to have two of his favorite gun. We're told that the Waaagh!(s) disbanded in the ensuing confusion.
103* ''TabletopGame/ContinuumRoleplayingInTheYet'': Any experienced time traveler has the occasional "Gemini incident" and needs to know how to coordinate their Elder and Junior versions to avoid TemporalParadox. Joan of Arc's temporal duplicates make up 98% of {{Atlantis}}'s police force.
104[[/folder]]
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106[[folder: Toys]]
107* Toys/{{Bionicle}}: The Brotherhood of Makuta member Bitil has a MaskOfPower that allows him to pull duplicates of himself from different points in his timeline, allowing him to create a small army of himself. The downside is that any injuries these other versions sustain stay with them when returned to their own time, meaning he often winds up with spontaneous wounds with no memory or explanation as to how he got them.
108[[/folder]]
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110[[folder:Video Games]]
111* ''VideoGame/ChronoTrigger'':
112** It's possible to leave Robo in the Middle Ages to tend to a forest and get him back in the present (that is, 400 years later). Going back to the Middle Ages results in seeing Robo tending to the forest but not interacting with you (even if you bring his future self to his past self).
113** In the DS remake's Lost Sanctum side-quest, the player needs to combine two crystals to create a new one. Since only one of the crystals exists in the entire world, the heroes have to travel to the future, retrieve the crystal, then bring it to the past to combine it with the original. The Lost Sanctum inhabitants even voice their surprise that you somehow found a second crystal.
114** Possible for the player to accomplish with a few of the "black box" treasures found throughout the game. After [[spoiler: empowering Marle's pendant with the Mammon Machine]], these can be opened. As there are several locales that can be visited in multiple time periods with these boxes, Crono and crew can open these boxes in later time periods, then travel to earlier periods to grab the same treasure again.
115* In the climax of ''VideoGame/DayOfTheTentacle'', Purple Tentacle steals one of the Chron-O-Johns and amasses an army of temporal duplicates of himself as part of his plans for world domination.
116* ''VideoGame/Disgaea4'': DLC character [[VideoGame/MakaiKingdom Petta]] utilizes this as an attack with "Time Drive" -- she strikes the enemy into the air, then travels back in time one second to strike the enemy again, follows that up with another one second trip backwards for a third strike, and then all three vaporize the target with her [[EyeBeams Petta Beam]]. She retains this skill going into ''VideoGame/DisgaeaD2'' and ''VideoGame/Disgaea5''. Her shared scenario with Pram and Zetta in the latter even has a small army of her temporal duplicates trying to prevent a prophesized disaster from happening should Zetta meet Killia. (Of course, said "prophecy" came from Pram, who is doing so to cause trouble for her own amusement.)
117* ''VideoGame/FateGrandOrder'': Edmond Dantes' [[LimitBreak Noble Phantasm]] "Enfer, Chateau d'If" is described as a technique of "super high-speed movement and thinking" that lets him transcend spacetime, and he can use it to create time-displaced duplicates of himself to attack multiple enemies simultaneously.
118* The Battle Royale mode of ''VideoGame/{{Fortnite}}'' has each match justified in lore as the entire island being subject to a GroundhogDayLoop. When a character manages to escape, the loop still repeats with a copy of them known "Snapshots". More snapshots are created each time a character enters and leaves, justifying multiples players being the same character like Jonesy or his variants running around. During the crossover with Marvel Comics, Iron Man managed to access and modify this property to mass produce a fleet of weaponized Battle Buses.
119* Because of the time-travel shenanigans involved in ''VideoGame/MortalKombat11'' as the result of [[BigBad Kronika]] messing with time, several characters meet up with their past selves. Whatever affects a character's past self affects their present self as well, which is used in a hilarious moment for Johnny Cage involving a bullet grazing the past self's cheek, as well as being used to [[spoiler:finally kill off Sonya's nemesis, Kano, by means of a MoeGreeneSpecial to his past self's non-cybernetic eye]].
120* ''Franchise/TouhouProject'': Sakuya Izayoi, the resident TimeMaster, often uses her time powers to let her throw a countless number of knives by pulling in knives she has thrown from specific points in time and then throw them again, and repeating the process.
121[[/folder]]
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123[[folder:Web Animation]]
124* ''WebAnimation/RedVsBlue'' had Church utilize this at one point, leading to a whole army of identical Churches ([[MyFriendsAndZoidberg and an absurdly yellow Church]]) trying to save his group and finding all of his plans backfiring on him. Later in the fifth season, Wyoming's use of his own time-loop powers ends up creating an army of himself that he uses to fight the Blues with.
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127[[folder:Webcomics]]
128* ''Webcomic/GunnerkriggCourt'':
129** This seems to have happened to Antimony Carver due to Loup messing with space and time to speak with her. Afterwards, Annie returned to the Court to find that not only have several months passed, but there's another Annie who has been there that whole time. They were stuck with two different Annies for a while, before [[spoiler: Zimmy (somehow) merged them back together, with both sets of memories]].
130** In chapter "The Thousand Eyes", it is revealed the mysterious robotic birds (several of which saved Annie back in chapter 8), are all the same bird, sent through time.
131* In ''Webcomic/{{Homestuck}}'', all Time players are expected to do this to bootstrap their group's session, averting UnintentionallyUnwinnable scenarios only to be [[ExpendableClone fated to die once they avert their branching timeline]]. Dave's time travel always results in multiple copies of himself from different points in time in the same location, who take care to coordinate with each other so that they don't accidentally break the StableTimeLoop. They work together to accomplish takes varying from [[DoppelgangerAttack teaming up to fight a foe too strong to beat alone]] to [[MundaneUtility cheating the stock market]]. Aradia, in her robot body, exploits her time powers to summon an endless army of temporal copies to use both as missiles against her session's FinalBoss and to suppress his acquired psychic powers that would have instantly wiped out all but one of her party.
132* In ''Webcomic/SchlockMercenary'', Kevyn travelled back in time to prevent events that led to the destruction of the galaxy. He succeeded, so now there's a [[https://www.schlockmercenary.com/2005-04-16 time-clone Kevyn]] from the alternate timeline. Sergeant Schlock also went back in time, but since he's a [[BlobMonster carbosilicate amorph]] he was able to [[https://www.schlockmercenary.com/2005-09-04 merge]] with his past self.
133[[/folder]]
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135[[folder:Web Original]]
136* In ''Chronotron'', you must travel back in time and use your copies to solve puzzles.
137[[/folder]]
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139[[folder:Web Videos]]
140* Played for laughs in a Website/CollegeHumor sketch that spoofs ''Film/BackToTheFuture1''. Marty travels back to the past to make sure his parents hook up, but he accidentally sleeps with his mother instead. Doc Brown sends him back in time to stop this, but he ends up having a threeway with his mother [[ScrewYourself AND himself]]. This escalates until the picture that originally showed Marty's parents now shows his mother and a [[MyOwnGrampa whole crowd of Martys]].
141[[/folder]]
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143[[folder:Western Animation]]
144* ''WesternAnimation/AdventuresOfSonicTheHedgehog'': The climax of the Chaos Emerald storyline involved Sonic gathering his past selves from his previous time traveling efforts in order to stop Robotnik, who had succeeded in gathering all the Emeralds and attained a super form.
145* ''WesternAnimation/DextersLaboratory'':
146** In the special "Ego Trip", Dexter travels into the future to meet his teenage self, then they both go further into the future to meet their elderly self, then all three go slightly into the past to meet their adult self. Their rival, Mandark, has a similar reunion.
147** In "Deedee-mensional", Dexter sends Dee Dee into the past to save himself from a slime monster that came out of his dimensional portal. He doesn't believe her until he sees her in the yard talking to her previous self. [[spoiler: In the end, he gets eaten anyway and [[HereWeGoAgain sends both Dee Dees into the past]].]]
148* In the ''WesternAnimation/FamilyGuy'' episode "Back to the Pilot", Stewie and Brian do some time travel to find the location of an old tennis ball that Brian buried ten years ago. Despite Stewie's best efforts to leave the past untouched, he ends up interacting with his past self from the original pilot "Death Has a Shadow", and Brian is no different, having intentionally interacted with his past self and given him information from the future to prevent 9/11, which has a huge ButterflyOfDoom consequence. It only gets worse when Stewie's attempts to prevent Brian from telling of any future events eventually leads to multiple Stewies and Brians coming in from the "further, further future", all declaring they had [[BadFuture Bad Futures]]. Soon, there is a large crowd of Stewies and Brians arguing it out over what to do, multiple duos [[CloneDegeneration having been subject to different temporal anomalies (such as one Stewie having boobs)]], and one duo being accompanied by their Peter. After one of the Stewies decides to hold a vote and most of the crowd agrees to let 9/11 happen, this Stewie decides to pull a case of "TheStoryThatNeverWas" and go back in time to prevent the first Stewie and Brian from ever causing damage to the past, thereby erasing the entire AlternateTimeline mess.
149* ''WesternAnimation/{{Futurama}}'':
150** ''[[Recap/FuturamaS4E10TheWhyOfFry The Why of Fry]]'': After sealing the Brainspawn in an alternate universe, Fry is given the opportunity to go back to 1999 and stop himself being frozen. He ends up underneath the table [[Recap/FuturamaS1E1SpacePilot3000 the original Fry was leaning against]]. He ends up pushing himself off balance to be frozen in the first place, before telling Nibbler that "Scooty Puff Jr sucks!" so he doesn't get stuck in the Infosphere again.
151** ''[[Recap/FuturamaM1BendersBigScore Bender's Big Score]]'': Whenever the Time Code is used to change someone's personal history, the past version becomes a time paradox duplicate with a new, separate timeline from the original. Due to EquivalentExchange, that duplicate is always doomed to die. Bender exploits this to create a copy of himself to go after Fry while he's busy using the bathroom, and due to using TheSlowPath there are hundreds of Benders in the limestone cavern that end up causing [[RealityBreakingParadox a tear in the fabric of the universe]] when he brings them up at once instead of when they're supposed to be. [[spoiler:Leela's new boyfriend, Lars Fillmore, is revealed to be a time duplicate of Fry from when he time travelled to when he got frozen, leading him to spend 12 years there while the original Fry falls into the same cryogenic tube he fell in during the pilot. This also means for almost a thousand years, there were ''three'' Frys frozen in the same facility.]]
152* ''WesternAnimation/TheGrimAdventuresOfBillyAndMandy'': In "Billy Gets an A", Grim and Mandy try to go back in time to stop the past Grim from altering reality by changing Billy's test grade. As they go farther and farther into the past, dozens of Grims end up joining them.
153* In the ''WesternAnimation/LloydInSpace'' episode "Day One", Lloyd uses Douglas' experimental time machine to go back into the past and prevent the incident in grade school that had him deemed a dork for years to come, manages to succeed and returns to a seemingly more successful present, but finds that being one of the popular kids is not all it's cracked up to be. After returning to the past again to stop himself from doing so, both Lloyds return to the present, only for an old Douglas to come back from the future and erase the first Lloyd that changed the future from existence before leaving.
154* In ''WesternAnimation/MiloMurphysLaw'', whenever Cavendish gets himself killed, Dakota goes back in time to prevent it, while sending his paradox self off to live on a distant island. Due to Cavendish constantly doing idiotic things that lead to his death, Dakota has done this so many times that his copies have started a civilization on the island.
155* ''WesternAnimation/PinkyAndTheBrain'': In "Brain of the Future", the title characters travel forward in time to 2,000,000,000 in a time capsule ship. While there, they meet multiple versions of themselves from different timelines. All of these different Pinkys and Brains then return to Acme Labs in 1997 and resume planning to take over the world.
156* ''WesternAnimation/Sealab2021'': In "Lost in Time", Quinn and Stormy get blown fifteen minutes into the past by a freak accident that destroys Sealab. When they try to warn Captain Murphy, they're accused of being "doppelgangers" and locked in the brig. Every time they go through the loop and try to stop the accident, more and more Quinns and Stormies [[JailedOneAfterAnother start filling up the brig]], including [[CloneDegeneration some weird-looking alternate versions caused by temporal anomalies]]. Finally, Stormy uses the two-way radio in his watch to warn the original Stormy and Quinn. How does Murphy deal with all the clones? He has them [[GladiatorGames fight to the death for his amusement]], of course!
157* In ''WesternAnimation/TheSimpsons'' Treehouse of Horror short "Bart & Homer's Excellent Adventure", Bart goes back to 1974 and ends up causing Homer and Marge to never get together and in-turn leads to Artie Ziff to be his father instead, and Bart actually enjoys this new life. Unfortunately for Bart, Homer from 1974 manages to hitch a ride in the time machine and ends up meeting the present-day Homer, and the two of them devise a plan to change history back. Their plan is to recruit Homers from all over the timestream to attack Artie and Bart... with all of them utterly failing and getting beaten up.
158* In ''WesternAnimation/{{Spliced}}'', [[InsufferableGenius Mr. Smarty Smarts]] uses a time machine to go back and prevent his past self [[ItMakesSenseInContext from creating an intelligence enhancing machine to make all mutants as smart as him]]. The two eventually play chess against each other only for one to get upset at the results. Cue another Smarty Smarts coming in to prevent a chess move followed by more and more.
159* ''WesternAnimation/SpongebobSquarepants'': In ''Back to the Past'', in order to undo their mistake of stopping Man-Ray from being sealed away in the past, Spongebob and Patrick go back in time to fix things. Failing the first time around they keep going back to fix things, with the episode ending with '''hundreds''' of Spongebobs and Patricks in one place, with more arriving constantly. Eventually Man-Ray stops [[MindScrew out of sheer confusion from the time travel]].
160* In the ''WesternAnimation/StevenUniverse'' episode "Steven and the Stevens," Steven comes across a device that allows for time travel. He uses this power to create a band with himself and three other temporal duplicates. Things soon spiral out of control and dozens of Stevens are fighting each other.
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