History Main / TemporalDuplication

** One sidequest in the Middles Ages ends in Robo volunteering to replant a forest, rejoining the party via TheSlowPath. After giving him a tune-up after four centuries of outdoor labor, you can revisit the Middle Ages with him in the party, and see his past self still at work reversing desertification.

* In ''VideoGame/OuterWilds'', this causes a NonStandardGameOver. [[spoiler:On Ember Twin, you can recreate the [[{{Precursors}} Nomai's]] experiments to confirm that warp travel can cause a "[[TimeTravel negative time interval]]," by shooting your scout camera into a black hole and seeing it emerge from the connected white hole a split-second before entering the black hole. If you yank out one of the power sources while there's two scouts coexisting, [[RealityBreakingParadox reality shatters]] to the message "YOU DESTROYED THE FABRIC OF SPACETIME."]]

* ''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.

** 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).
** 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.
** 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.

** 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. He seemed to be limited to only one of him of each "regeneration", though, so this may count as [[PlayingWithATrope playing with the trope]] as each regeneration has an altered personality [[TheNthDoctor and appearance]].

** Jack Harkness post-Series 1 took TheSlowPath from 1869 to meet up with the chronologically correct version of the Doctor, and in the ''Series/{{Torchwood}}'' episode "Exit Wounds" where [[AndIMustScream he's buried from the 1st century to the start of the 20th century]] [[HumanPopsicle before being frozen in Torchwood until his present]]. As such, "[[Recap/DoctorWhoS27E9TheEmptyChild The Empty Child]]", "[[Recap/DoctorWhoS27E10TheDoctorDances The Doctor Dances]]" and "[[Recap/DoctorWhoS27E11BoomTown Boom Town]]" have three versions of Jack Harkness present. It's even more evident in "Boom Town", where they are all located in Cardiff, with the second Jack putting Torchwood on lockdown to avoid a paradox.

* ''Literature/{{Discworld}}'', ''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).

* ''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 the time. 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.

** 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. Now they're stuck with two different Annies, and there may now be at least one other timeline where she has suddenly ceased to exist.

* In ''Manga/EdensZero'', a being called the Chronophage has eaten 50 years of a planet's time, causing that planet to regress 50 years into the past. This has effectively created duplicates of everyone and everything that was on that planet 50 years ago but not when the Chronophage showed up. As a result, two versions of Weisz Steiner now coexist together, the older present-day version, and a younger version from 50 years ago.

* Played for laughs in a Website/CollegeHumor sketch that spoofs ''Film/BackToTheFuture''. 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]].

Distinct 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.

* ''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 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!

* In ''LightNovel/HumanityHasDeclined'', the fairies trap the protagonist in a time loop which creates several dozen copies of her to make sweets for them.

* Kurumi Tokisaki from ''LightNovel/DateALive'' is able to create duplicates of herself using Zafkiel's Time Master powers.

* ''Series/MysteryScienceTheater3000'' once had Mike and the Bots watching a time travel movie (''Film/TimeChasers'') and 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.
* The ''Series/StarTrekDeepSpaceNine'' episode "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..."
* On ''Series/AgentsOfSHIELD'', after the rest of the team got transported to the future, Leopold Fitz decided to take TheSlowPath to go after them, by cryogenically freezing himself aboard a spaceship. After everyone returned to the present, there were now two Leopold Fitzes in the present, one who came back from the future, and one still frozen aboard the ship. After the team broke the StableTimeLoop and changed the future, the Fitz from the future died, so the team decided to go out into space to retrieve the present Fitz from the spaceship.

* 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 effots 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.

* ''Machinima/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.

* The Battle Royale mode of ''VideoGame/{{Fortnite}}'' has each match justified in lore as the entire island being subject to a GroundhogDayLoop. Multiples of characters running around are further justified as this loop creating duplicates called "Snapshots". During the crossover with Marvel Comics, Iron Man managed to access and modify this property to mass produce a fleet of weaponized Battle Buses.

As described in ''Up the Line'', 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.

* 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, taking it UpToEleven with a party attended by dozens of his past, present, and future selves.

* 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 takes this UpToEleven, with 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.

* ''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. Taken UpToEleven with Joan of Arc, whose temporal duplicates make up 98% of {{Atlantis}}'s police force.