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.



[[folder:Anime & Manga]]
* ''Anime/Pokemon4Ever'' is a textbook example; Celebi's powers even include time travel.
* In the ''Anime/{{Ulysses 31}}'' episode "Strange Meeting", the main characters are sent back in time to Ancient Greece, the setting for the original [[Literature/TheOdyssey Odyssey]]. Before he, Telemachus, Yumi and No-No can return to the 31st Century, Ulysses must help his ancestor (and namesake) to reclaim his kingdom.

[[folder:Fan Fic]]
* "Time Terror" from ''Fanfic/CalvinAndHobbesTheSeries''.

[[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 [[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]].
* These are very common in the various ''Franchise/StarTrek'' shows and movies:
** ''Series/StarTrekTheOriginalSeries'': There's the episode "City On the Edge Of Forever", in which Bones accidentally steps through a time portal that takes him back to the 1930s, where he inadvertently changes the timeline so humans never went into space. It's up to Kirk and Spock to follow him and repair the damage.
** ''Series/StarTrekTheNextGeneration'': There's "Time's Arrow", where the Enterprise find Data's centuries-old head lying in a cave in San Francisco in the 24th century. It turns out Data went back in time to the 19th century to follow two aliens and became TrappedInThePast.
* ''Series/StargateSG1'': In the episode "1969", SG-1 ends up in the 1960s when a solar flare intercepts with an active wormhole.
* ''Series/{{Supernatural}}'':
** In the episodes "In the Beginning" and "The Song Remains the Same", Dean is sent back in time by the Angels to meet his parents before either he or Sam were born.
** In "Frontierland", Sam and Dean [[CowboyEpisode travel to the Old West]] to find an AchillesHeel they need to kill one of that season's villains.
* ''Series/AshVsEvilDead'': The penultimate episode of Season 2, "Home Again", involves Ash and co. going back in time to 1982 to prevent his younger version from ever using the Necronomicon at the cabin to summon the Kandarian demons. The following episode, "[[SeasonFinale Second Coming]]", continues this plot.

* ''Machinima/Supermarioglitchy4sSuperMario64Bloopers'' has had four episodes:
** "Time Travel Tells", where Mario goes back in time and accidentally changes history by killing a Nintendo employee, resulting in an alternate future where Mario doesn't exist;
** "Castle Jumping = Time Travelling = Zombies" where Mario goes into an encounter with his future self in an attempt to jump the Castle and they end up time-travelling into a ZombieApocalypse future;
** "Ssenmodnar 9 - Time Travel Edition" where Mario tries to go back in time to save his brother Luigi's life from a fatal accident and ends up in the multiple skits of the video and;
** "[=SM64=]: Retarded Recap 2015" where Mario goes back in time to the beginning of 2015 in an attempt to eat an expired pizza, and changes the timelines of all the 2015 videos in the process.

[[folder:Western Animation]]
* ''WesternAnimation/{{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 in the dinosaur age, where Ned accidentally changes history by stomping on a fly, resulting in an AlternateUniverse where Newton-like newts are the dominant species and humans are the pets. When they fix it and attempt to get back home, they instead end up at Series/GilligansIsland, but it [[AllJustADream turns out to be just a dream]]. [[OrWasItADream Or was it?]]
* ''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]]".
** The season 5 finale, "[[Recap/MyLittlePonyFriendshipIsMagicS5E25TheCutieRemarkPart1 The Cutie]] [[Recap/MyLittlePonyFriendshipIsMagicS5E26TheCutieRemarkPart2 Remark]]" features season BigBad [[TheEvilsOfFreeWill Starlight Glimmer]] heading back in time to try and [[MakeWrongWhatOnceWentRight prevent the events that brought the Mane Six together]]. Twilight gets trapped in a cycle of trying to stop Starlight, failing and getting transported to worse and worse {{Bad Future}}s, until [[spoiler: showing Starlight the results of her actions, inducing a HeelRealization]].
* ''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.
* ''WesternAnimation/TheSimpsons'': "WesternAnimation/TreehouseOfHorror [[Recap/TheSimpsonsS6E6TreehouseOfHorrorV V]]"'s second short "Time and Punishment", in which Homer somehow turns a toaster into a time machine and ends up in the Mesozoic, where [[ButterflyOfDoom he messes up the present by his actions there]]. Naturally, HilarityEnsues when he attempts to fix it.
* ''WesternAnimation/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 Film/BillAndTed, and then the series finale "Time After Time" which is chock full of every kind of time hijinks.
* The ''WesternAnimation/AdventuresOfSonicTheHedgehog'' 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]].
** Before that was the three-parter "The Savage Time", wherein immortal villain Vandal Savage sends advanced knowledge and technology to his past self, allowing him to take over Nazi Germany and win UsefulNotes/WorldWarII, going on to conquer the world. The Justice League (minus Batman, who wasn't present) are protected from the changes to the timeline by Green Lantern's ring, and travel back to the war to defeat Savage and restore history.
* ''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.
* WesternAnimation/{{SpongeBob|SquarePants}} 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 need to stop Patrick from messing it up like the first time.
* In the ''WesternAnimation/KimPossible'' three-episode story "A Sitch in Time", three of [[RoguesGallery Kim's recurring enemies]] [[VillainTeamUp work together]] to find a "Time Monkey" with which to interfere with Kim's childhood and prevent her from developing the strength and confidence that will make her a hero. The main plan fails, but [[HyperCompetentSidekick Shego]] grabs the Time Monkey for herself and uses it to {{take over the world}}.
* In the ''WesternAnimation/ThePowerpuffGirls'' episode "Get Back Jojo", Mojo Jojo uses a time portal to travel back to 1959 and kill the young Professor Utonium so he can't create the Powerpuff Girls. The girls follow him and stop him, and witnessing all this turns out to be what inspired Utonium to become a scientist in the first place.
* The cast of ''WesternAnimation/{{Kaeloo}}'' have their own time machine, and they use it in a few episodes: the episodes "Let's Play Time Travel", Episode 75 and Episode 76[[note]]Episodes 75 and 76 are a two-parter[[/note]].
* The ''WesternAnimation/AtomicPuppet'' episode "Bucket List" is about Joey and AP trying out a time travel challenge (done a la ''Film/SupermanTheMovie'') that Joey made on a list of "things I want to do when I become a superhero". They end up in the Mesozoic, the Middle Ages, Feudal Japan, and the early 2000s, where they meet a younger Joey, the former Captain Atomic, and a pterodactyl-ninja-knight created by a time vortex.
* The ''WesternAnimation/MegaMan'' episode "Future Shock" was about Mega Man traveling to the future when he thought he'd sent Dr. Light there accidentally using a prototype time machine. But since Mega Man wasn't around to defeat Dr. Wily, he wound up in the BadFuture instead.

* 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.