Basically, [[ExactlyWhatItSaysOnTheTin an episode whose plot revolves around]] [[TimeTravel time travel]]. Maybe the villain wants to [[RetGone remove the hero from history]]. Maybe the resident GadgeteerGenius wants to see the tech of the future.

{{Groundhog Day Loop}}s don't really qualify, since in that case the time travel is reset at the end.

In some cases, the time travel is a FramingDevice for a RecapEpisode, or for giving a character's [[BackStory origins]].

See also TimeTravel, TimeTravelTropes, GroundhogDayLoop.
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!!Examples

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[[folder:Anime and Manga]]
* ''Anime/Pokemon4Ever'' is a textbook example; Celebe's powers even include time travel.
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[[folder:Fan Fic]]
* "Time Terror" from ''Fanfic/CalvinAndHobbesTheSeries''.
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[[folder:Live-Action TV]]
* ''FirstWave'' has two. Both involve the BadFuture. One has a member of post-AlienInvasion LaResistance use a time machine to save Cade's life. She succeeds and returns to her own time, hoping to find it changed for the better. In another, Cade is the one who travels to the future, where he finds his own future self, who has become an embittered man regretting his decision to [[spoiler:let Jordan die]] in order to get the [[spoiler:MacGuffin Hammer]], especially since this somehow rendered the Hammer insert. In the end, Cade [[TakeAThirdOption Takes a Third Option]]: he gets the Hammer and uses it to [[spoiler:free Jordan from Mabus's [[GrandTheftMe control]]]].
* In the final season episode "Mokey Then and Now" of ''Series/FraggleRock'', Mokey, Wembley, and Boober accidentally [[InvokedTrope get sent back in time]] after triggering some mysterious magic inside the Sacred Cave. They're sent back to a time in the distant past that Mokey identified as being before the arrival of a figure called the Great and Wondrous Blunding. It turns out that [[YouWillBeBeethoven the Great and Wondrous Blunding was none other than Mokey Fraggle]], who teaches the ancient Fraggles the "Dance Your Cares Away" song, promotes having hair, and encourages freedom over following a leader.

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[[folder:Western Animation]]
* ''{{Freakazoid}}'' had an episode where the titular hero [[RefugeInAudacity prevented the attack on Pearl Harbor]].
* ''[[FairlyOddparents The Fairly OddParents]]'' had two episodes where Timmy went back in time, first to [[JerkAss keep his dad from winning a trophy]], and next to make Mr. Crocker less miserable. Both backfired horribly.
* In the ''WesternAnimation/{{Underdog}}'' story "Simon Says No Thanksgiving", Simon Barsinister and Cad went back to the 1620s to prevent the first Thanksgiving from taking place. Underdog and Sweet Polly followed them to keep history on track.
* In the second-season ''{{Pac-Man}}'' episode "Journey into the Pac-Past", P.J. turned Pac-Man's clothes washer into a time machine.
* {{Futurama}} loves using this theme. Episodes include: "RoswellThatEndsWell", "Time Keeps On Slippin", "Bender's Big Score" and "The Late Phillip J. Fry".
* PhineasAndFerb has had two-"It's About Time" and "Phineas And Ferb's Quantum Boogaloo".
* The ''WesternAnimation/MyLittlePonyFriendshipIsMagic'' episode "[[Recap/MyLittlePonyFriendshipIsMagicS2E20ItsAboutTime It's About Time]]".
* ''WesternAnimation/TransformersRescueBots'' The season 1 finale "It's a Bot Time"/"Bot to the Future".
* ''GravityFalls'' has [[Recap/GravityFallsS1E9TheTimeTravelersPig "The Time Traveler's Pig"]], when Dipper "borrows" a time-traveler's device in order to get a "do-over" after he beans his PrecociousCrush with a baseball.
* ''StaticShock'' had two--Season Three's "Flashback," where Static and Gear team up with a Bang Baby with time-traveling powers and travel back to the night Virgil's mom died, and Season Four's "Future Shock", a crossover with ''WesternAnimation/BatmanBeyond'', in which Static traveled to that era and teamed up with Terry McGinnis.
* ''JackieChanAdventures'' three, all revolving around Jade: "Through the Rabbit Hole," in which Jade travels back to San Francisco in the 70s, meeting younger versions of Jackie, Uncle, and Valmont, "J2," in which a FutureBadass version of Jade travels back to stop an criminal who escaped from her time, and "J2 Revisited", in which young Jade travels to the future to team up with her FutureBadass self.
* ''XiaolinShowdown'' had the two-parter "Days Past"/"Citadel of Doom" in which Omi travels to the past to get help from Grand Master Dashi, "The Sands of Time," which features Jack Splicer playing an evil [[BillAndTedsExcellentAdventure Bill and Ted]], and then the series finale "Time After Time" which is chock full of every kind of time hijinks.
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[[folder:Other]]
* In ''The Star Trek Experience'' at the Las Vegas Hilton, an unknown entity/force takes a group of present (21st Century) tourists to the 23rd Century, but, when that happens, Captain Picard suddenly disappears. It is explained that one of the travellers is one of Picard's ancestors, who must be returned to the past (21st Century) to allow Picard's existence.
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