Basically, [[ExactlyWhatItSaysOnTheTin an episode whose plot revolves around]] [[TimeTravel time travel]], whether it's to the future or to the past. 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 & 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]]
* ''Series/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.
* ''Series/MurdochMysteries'': The plot of "Twentieth Century Murdoch" revolves around a time machine. A man gets involved in a couple of incidents (a suicide attempt and a shooting) and claims he went to the future, saw the events and went back to intervene. He also wants to save a boy from being trampled by horses, and Constables Crabtree and Higgins later go to the street intersection and witness events unfold just as the man said they would. Soon word gets around, and people are lining up and paying for trips to the future. Murdoch is initially skeptical despite the testimony of other paying travelers, but when the scientist suggests he try the device, Murdoch takes him up on the offer. What Murdoch sees (including himself married to Julia in 1912 and an eight year old boy who introduces himself as "William Murdoch Junior") changes his mind, and he's soon closeted in his office with the scientist, with his blackboard covered in equations. It turns out [[spoiler: the machine uses electricity to make people more suggestible and they have "visions" of the future based on what the scientist tells them they're seeing]] and [[spoiler: the scientist is using the money to finance a cryogenic chamber for his half-brother Dr. Roberts, who has Huntington's disease]].

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[[folder:Machinima]]
* Machinima/Supermarioglitchy4sSuperMario64Bloopers has two of these: "Time Travel Tells" and "Castle Jumping = Time Travelling = Zombies".
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[[folder:Western Animation]]
* ''{{Freakazoid}}'' had an episode where the titular hero [[RefugeInAudacity prevented the attack on Pearl Harbor]].
* ''WesternAnimation/TheFairlyOddParents'' had three 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. Later on Timmy goes back in time with Cosmo and Wanda to meet some of their past god kids and messes up every kid's plan to invent something new.
* 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 ''VideoGame/MsPacMan'' episode "Journey into the Pac-Past", P.J. turned Pac-Man's clothes washer into a time machine.
* ''{{WesternAnimation/Futurama}}'' loves using this theme. Episodes include: "RoswellThatEndsWell", "Time Keeps On Slippin", "Bender's Big Score" and "The Late Phillip J. Fry".
* ''WesternAnimation/NedsNewt'': "Jurassic Joyride".
** In the episode, Ned and Newton go back in time to Friday so they can enjoy the weekend again, but instead end up at the dinosaur age, [[spoiler:where Ned accidentally changes history simply by stomping on a fly]]. When they [[spoiler:fix it]] and attempt to get back home, they instead end up at Literature/GilligansIsland, but it [[AllJustADream turns out to be just a dream]]. [[spoiler:Unfortunately for Newton, he notices [[OrWasItADream W-ZIP TV is informing about Ned and him crashing at Gilligan's Island]], and as the presenter calls him a "big blue doofus", it pushes his BerserkButton, which makes him attempt to get his agent, "the biggest egg roll in Chinatown" and "some broccoli with cheese sauce" until he turns back into a small newt]].
* ''WesternAnimation/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".
* ''WesternAnimation/GravityFalls'':
** [[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.
** In a later episode, Dipper and Mabel end up ten years in the past after another run-in with the time-traveler. They use the opportunity to figure out why Soos never enjoys his own birthday parties.
* ''WesternAnimation/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.
* ''WesternAnimation/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.
* The ''WesternAnimation/TheAdventuresOfSonicTheHedgehog'' four-part Chaos Emerald Saga involves Dr. Robotnik forcing Professor Caninestein to build him a time machine so he can travel back in time to get the Chaos Emeralds and become the Supreme high Robotnik. Professor Caninestein invents time-travel devices for Sonic so he can find the Emeralds before him. The episodes involve a Pirate Ship, a Medieval Kingdom, a Pyramid, and a Prehistoric Island, respectively.
* ''WesternAnimation/TinyToonAdventures'':
** In "A Ditch in Time", Plucky's future self invents a time machine, then travels back four days to show his present-day counterpart. The present-day Plucky borrows the time machine so he can travel back in time to do his homework ahead of time. However, when he shows it to Buster and Babs, he travels back to a Prehistoric Acme Acres, while Buster and Babs travel to a Medieval Acme Acres. They all meet the ancestors of the show's cast, mostly the Prehistoric ones. Plucky takes advantage of the Prehistoric ancestors, until Buster and Babs reunite with him and tell them the truth.
** In "What Makes Toons Tick", Calamity builds a time machine so Buster can show the viewers why his friends are the way they are. He and Calamity travel back to Dizzy Devil's first romantic encounter, Baby Plucky's experience with a mall elevator, and Hamton and Sneezer's fearless encounters with a closet monster.
* ''WesternAnimation/JusticeLeague'': The two-parter "The Once and Future Thing" has several of the heroes chasing time-traveling villain Chronos, first into [[CowboyEpisode the Old West]] and then into [[WesternAnimation/BatmanBeyond the future]].
* ''WesternAnimation/DefendersOfTheEarth'' has "Terror in Time", in which Ming manipulates all but two of the Defenders into a time warp and sends them back to the days of King Arthur. While there, they meet Prince Valiant and help him to rescue his wife from an evil sorcerer. However, Ming's motive for sending his enemies back in time is far more nefarious than simply getting them out of the way; he has developed a [[TheSymbiote parasitic mutant life-form]] - and he has used the Defenders as pawns in his plan to send the organism back in time and destroy all life on Earth.
* In the ''WesternAnimation/ThreeTwoOnePenguins'' episode "Wise Guys", the Rockhopper crew gets sent 75 years into the future via time machine malfunction. Zidgel, Midgel, and Fidgel encounter their future selves, although Zidgel is frightened by his future self.
* SpongeBob and Patrick accidentally get sent back in time with Mermaid Man & Barnacle Boy and Patrick foils their plan to capture Man Ray and stop him from taking over Bikini Bottom. When they go back in time to fix things, they eed to stop Patrick from messingg it up like the first time.
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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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