[[quoteright:350:[[Franchise/BackToTheFuture http://static.tvtropes.org/pmwiki/pub/images/delorean__back_to_the_future__by_cylonka-d6m5v3e_5818.jpg]]]]
[[caption-width-right:350:Goes from 1985 to 2015 in [[TimeTravelTenseTrouble under 8 seconds]].]]

->''"Aaron, I'm standing at the Time Portal, which scientists say follows ''Franchise/{{Terminator}}'' rules, that is, it's one way only and you can't go back. This is in contrast to, say, ''Film/BackToTheFuture'' rules, where back and forth is possible, and, of course, ''[[Film/TimeriderTheAdventureOfLyleSwann Timerider]]'' rules, which are just plain silly."''
-->-- ''WesternAnimation/SouthPark''

A TimeMachine is the main prerequisite for TimeTravel and all the other fun that goes along with it. Time Machines in fiction can boil down to a few simple types. The type of machine can combine with any of the [[OurTimeTravelIsDifferent different ways of experiencing the process of time travel]] and with [[TemporalMutability the various degress to which the past can be changed]].
* With the ''Film/BackToTheFuture''-type machine, one simply gets into a vehicle of some sort, and the vehicle is transported to a certain time. When a traveler wants to go back, they use the machine again. This is pretty much the most common type, possibly having to do with the fact that one of the earliest time travel stories (''TheTimeMachine'') used this type.
* A ''[[TimeAndRelativeDimensionsInSpace TARDIS]]''-type machine works like a ''Film/BackToTheFuture''-type one except not only can you program it to go anywhere in time, but also anywhere in space. Basically it's a vehicle that can go anywhere in 4 dimensions.
* ''{{Terminator}}''-type machines usually involve some sort of big device that projects a traveller back, but does not come with them. Once back in time, the person has no way back to the future besides TheSlowPath, unless they can somehow build another device, or if they were able to bring an entire additional time machine with them to leave behind on that trip also. (And this is sometimes precluded by time machines being too big, or the rules not allowing you to take things, or just time machines, with you.) Sometimes these only allow backwards trips to start with.
* ''TimeCop''-type machines are a cross between the ''Film/BackToTheFuture''-type and the ''{{Terminator}}''-type; the traveller is sent back by a machine that does not come with him, but has some sort of way (such as a remote or prearranged time portal) to make a trip back, utilizing the future time machine. Can also being used as a "time scoop" to bring things from the past into the present without going there. Losing the signaler or missing the prearranged portal can require past travelers [[WriteBackToTheFuture Writing Back To The Future]] to get home.
* A [[PortalToThePast Time Portal]] provides a direct gateway between two points in space and time is another variation. These can be [[NegativeSpaceWedgie random]], appear and disappear in a predictable way, or be permanent. A pre-existing Time Portal is a way to introduce TimeTravel to a series without opening the Pandora's Box of "why didn't they just go back in time and stop the bad guy".
* A Time Dilation Field is a device that causes time inside a certain area to either go [[YearInsideHourOutside faster or slower.]] While not a time machine in the classical sense, a field with time set to go slower is a good way to travel ''forward'' in time.
** In RealLife, TimeDilation is an actual effect that occurs when bodies are moving at different relative velocities, or at different depths in a gravity well. This is generally too tame and prosaic for all but the [[MohsScaleOfSciFiHardness hardest]] ScienceFiction, though.

Having a time machine can (but not always) have the side effect of ReedRichardsIsUseless - as a little FridgeLogic one can think of many ways to better use it than visiting your [[GrandfatherParadox grandparents]] or [[MundaneUtility paying your bills on time]].

Other types exist, but these are the most common. Compare InterdimensionalTravelDevice.
----
!!Examples

[[foldercontrol]]

[[folder:Advertisements]]
* There were a couple of Super Golden Crisp commercials in 1993 where Granny used a weird-looking magical clock to pull a "Granny Goodwitch Time Switch" to travel into the past to try to get away from Sugar Bear, like [[https://www.youtube.com/watch?v=S7CDcsCC7vw this one]]. Unfortunately, he was always a step ahead of her.
[[/folder]]

[[folder:Anime and Manga]]
* ''Manga/MahouSenseiNegima'' has the Cassiopeia, which is essentially a time-traveling pocket watch.
* ''LightNovel/HaruhiSuzumiya'' has the TPDD (Time Plane Destruction Device), which the {{Time Travel}}ers use. No one really knows what it is because its "Classified Information", but it seems to be a handy device.
** The Integrated Data Sentient Entity is capable of producing a TimeDilationField (technically TimeStandsStill, but functionally the same), as demonstrated in ''Bamboo Leaf Rhapsody''.
* In alternate timelines in ''Anime/DragonBallZ'', Future Bulma created a time machine so her son [[FutureBadass Future Trunks]] could go back in time to find a way to defeat the rampaging Cyborgs or to bring back Goku to help.
* [[http://yugioh.wikia.com/wiki/Time_Machine Time Machine]] in ''Anime/YuGiOh'' and its card game, [[AvertedTrope except it doesn't work like one]]. Instead it [[AutoRevive re-summons the monster that just died]].
* [[spoiler:Homura]] of ''Anime/PuellaMagiMadokaMagica'' has a magical buckler that allows her to travel back in time, but only as far back as [[spoiler:her first meeting with Madoka]] because of her wish, making it a variant of the Terminator style of time travel.
[[/folder]]

[[folder:Comic Books]]
* The time machine in ''{{Meanwhile}}'' is one-way and can only go as far back as when its receiving end was originally built. When Timmy first encounters it, the Professor has locked it so that it can only go a maximum of ten minutes into the past.
* Dale and Stacey Yorkes from the Marvel comic ''Comicbook/{{Runaways}}'' pilot a stationary two-seater TARDIS-type time machine.
* In ''SuskeEnWiske'' (Spike and Suzy) the "teletimemachine" is a ''TimeCop''-type; the machine does not come with the time traveler, but an operator who stays behind can retrieve the time traveler at any moment. This feature was often used for last second rescues.
* The ''BlakeAndMortimer'' episode "The Time Trap" features a ''Film/BackToTheFuture''-style time machine. But the MadScientist who created it rigged it so the time traveler has little control over when he ends up...
* The ComicBook/{{Legion of Super-Heroes}} possesses a [[http://dc.wikia.com/wiki/Time_Bubble time bubble]] that they often used to visit Superboy and Supergirl.
* The Cosmic Treadmill used by various Flashes in the DC multiverse can transport them through time.
[[/folder]]

[[folder:Film]]
* For the record, ''[[Film/TimeriderTheAdventureOfLyleSwann Timerider]]'' uses a ''Film/BackToTheFuture''-type.
* ''TimeAfterTime'', naturally, has a ''Back to the Future''-type, since it stars the author of ''TheTimeMachine''.
* The movie ''Film/DejaVu'' has a ''{{Terminator}}''-type.
* The ''Film/BillAndTed'' movies have a ''TARDIS''-type that runs on SanDimasTime.
* The movie ''[[TwelveMonkeys 12 Monkeys]]'' is another ''Film/{{Timecop}}''-type.
* The film ''Film/{{Primer}}'' has an interesting variation on the Time Machine that doesn't quite fit into any of the above types, but can be imagined as a sort of unique combination of TimeDilationFields and TimePortals that only go backwards a la ''{{Terminator}}''. It gets worse; see [[http://en.wikipedia.org/wiki/Primer_%28film%29 the film's Wikipedia entry]].
** Summary: The time machine is a box containing a volume that exists over time. Turning the box on causes this volume to (slowly) dissociate from the rest of the universe, and turning the box off reverses that. Within this mini-universe, time flows like it usually does, but it cycles back and forth between the two endpoints - inside the box, time ''reverses'' when the box is turned off, and back again when the box is turned ("back") on. Turning the box on, waiting a minute and getting into the box just before it turns off, and waiting another minute before getting out [[TimeTravel means...]]
* ''[[AustinPowers Austin Powers in Goldmember]]'' features the ''Film/BackToTheFuture''-type.
* The Soviet comedy ''IvanVasilievich'' features a Time Portal version, connecting the inventor's apartment to IvanTheTerrible's throne room. However, given that the part about the time machine working is AllJustADream, we can't be sure if it would have ever worked, although Shurik's intention is, at least, to build a Time Portal-like device.
* ''Film/{{Looper}}'' appears to have the ''{{Terminator}}''-type time machine 30 years from the film's time, which TheMafia uses to cleanly dispose of those they want to kill (i.e. they send a message into the past, warning their predecessors about the time and the place, who then send a Looper there with a gun; the future mafia send the target with a bag over his head and payment for the hit in the form of gold bars; the Looper kills the target, incinerates the body, and gets paid).
** A case of FridgeBrilliance with gold bars, by the way, as finding 30-year-old currency in large amounts would probably be more trouble than its worth. It would also attract the attention of the cops, considering time travel is illegal.
[[/folder]]

[[folder:General]]
* It's been suggested that the Time Portal must be the only feasible method out of the ones listed, by dint of the fact that all of the others would allow time travelers [[TimeTravelTenseTrouble to have come back]] to visit us in the past/present, which would presumably be noticeable - more out-of-the-blue ETGaveUsWiFi moments, for example. A Time Portal requiring a "receiver end" to be built before travelers can come back would mean time travel is only possible as far back as the invention of the time machine. On the other hand, it could just be an ExtraStrengthMasquerade at work.
[[/folder]]

[[folder:Literature]]
* Named for ''TheTimeMachine'' by HGWells, which might even be the trope maker.
* OlderThanRadio: ''[[ElAnacronopete El anacronópete]]'' by Enrique Gaspar y Rimbau, published even before Welles' ''The Time Machine''.
* Creator/RayBradbury's ''Literature/ASoundOfThunder'' has them recently invented.
* The book ''{{Pastwatch}}'' is another ''Terminator''.
* The book ''Literature/ToSayNothingOfTheDog'' has an interesting variation on the ''TimeCop''-type machine mixed with Time Portals; it's mostly used for historical purposes.
* The book ''ToBringTheLight'' involves a guy sent back to the late Roman Empire [[LightningCanDoAnything by way of lightning]].
* The mechanics of the trip back in Mark Twain's ''Literature/AConnecticutYankeeInKingArthursCourt'' are never explained, but time travel forward was due to the wizard Merlin, even though there was no magic in the book before this.
* TimeDilationFields are used extensively in Creator/LarryNiven's ''Literature/KnownSpace'' stories, most notably ''ARM'' and ''World of Ptavvs''. The Slaver Stasis Field is a kind of Time Dilation Field: inside one, time ''stops''. ''World of Ptavvs'' has a character who's been in one for a ''very'' long time (in the outside universe, of course; from his perspective he just now turned it on).
* In PoulAnderson's series of short stories and novellas about the Literature/TimePatrol, the members of the Patrol use distinctly [[TimeAndRelativeDimensionsInSpace TARDIS]]-like vehicles, ranging from one- or two-person motorcycle-like "time scooters" to larger, multi-passenger time transports.
* Near the end of TheForeverWar we find out [[spoiler:some humans are using a spaceship as a time-dilation type of time-machine in order to get reunited with people separated by FTL travel.]]
* The Time Matrix, from the ''Literature/{{Animorphs}}'' mythos, appears at first to be a basic TARDIS-type, though it's notable that it's (realistically) regarded consistently by the characters as the greatest weapon ever created. Then it gets ''really'' weird. For example, if mixed or vague coordinates are given, it will actually create new universes to fit the specifications.
* Several of [[FarFetchedFiction Robert Rankin's novels]] involve time travel, most often by means of a talking time-travelling Brussels sprout named Barry, who can share his powers with people if shoved in their ear. Largely, it seems implied that Barry is a ''Film/BackToTheFuture'' type 'time machine' - although physical locations rarely seem to be a bother. Barry was also cited to be the driving force behind [[HGWells Wells]]' [[TheTimeMachine Time Machine]], inhabiting a metal box in the back. Oh and he's [[spoiler:Elvis Presley's best mate.]]
* Time travel in Dan Bayn's ''Tempus'' setting is ''{{Terminator}}'' style. You can only travel to the past, and once you've arrived, you cannot go back -- time is like a funnel in Tempus, with an infinity of possible futures spiralling into the present until just one becomes the past, and going forward in time would scatter you among those many futures like dust in a hurricane. Basically, [[RuleOfCool it's an excuse to have cool futuristic tech in the modern day]].
* HarryTurtledove's ''Literature/TheGunsOfTheSouth'' features South Africans using a time machine to go back to the AmericanCivilWar. The machine goes back by a fixed amount, so time passes at the same rate on both sides.
* The [[spoiler:trolley (shopping cart)]] in [[Literature/JohnnyMaxwellTrilogy Johnny and the Bomb]] is a Film/BackToTheFuture-style time machine.
* Gerald Durrell's ''The Fantastic Dinosaur Adventure'', the sequel to ''Literature/TheFantasticFlyingJourney'', turns a hot air balloon into a Film/BackToTheFuture-type time machine.
* In ''Literature/TheExtraordinaires'', the Neanderthals construct a TimeCop style device as part of their plan to MakeWrongWhatOnceWentRight. The machine sends people into the past with belts that allow them to return to the present.
* The M.I.N.D. Machine of ''{{Literature/Dinoverse}}'' is between a Terminator and Time Cop type device, which can also breach dimensions. When it comes to time, you CantTakeAnythingWithYou, [[IntangibleTimeTravel including your body]], but you end up in a new one and have to get something done before it lets you come back. There is no such restriction with interdimensional travel, but it ''doesn't'' take you back.
* The ''[[Literature/TimeMachineSeries Time Machine]]'' gamebook series is all about traveling to the past with a time machine to unravel mysteries, then traveling back and forth between various eras once you're in the past. You never actually get to see what the time machine looks like, and your amount of control over where and when it deposits you varies heavily from page to page.
* The Time Turners of ''Franchise/HarryPotter'', first introduced in ''Literature/HarryPotterAndThePrisonerOfAzkaban'', are a ''Terminator'' type. Due to the obvious potential dangers of misuse, they are heavily regulated by the Ministry of Magic, and the two most important laws those who are issued them must follow are: [[NeverTheSelvesShallMeet never be seen by your past self]], and [[YouCantFightFate don't change time]] (this one may be moot, as Harry's actions in the past turn out to be a StableTimeLoop).
* In the book ''Literature/SonicTheHedgehogInTheFourthDimension'', Franchise/SonicTheHedgehog and tails use a [[HamsterWheelPower Time Treadmill]] to race back to the beginning of time. Physics is slightly more realistically applied than usual, as both Sonic and Tails get exhausted and have to take turns running, and their previously indestructible shoes, made specifically to withstand the force of their running, get demolished.
[[/folder]]

[[folder:Live-Action TV]]
* ''Series/StargateSG1'', while mainly using ''Film/BackToTheFuture''-type machines, also uses Time Portals and {{Time Dilation Field}}s.
* While the TARDIS in ''Series/DoctorWho'' in theory can go anywhere in four dimensions in practice, it breaks so often that it only really works if you don't care where you're going. It doesn't so much break down as take you where you need to go.
** "Carnival of Monsters" and "The Five Doctors" had ''{{Timecop}}'' style Time Scoops, machines that could beam in objects from anywhere and anywhen to the machine's present, without needing any equipment at the other end.
** The episode "The Girl In The Fireplace" revolves around Time Portals.
*** Also totally random in their targeting, and their reliability in the case of the titular fireplace.
** The Daleks' time-travel technology has varied over the years. In "[[{{Recap/DoctorWhoS2E8TheChase}} The Chase]]" and "[[{{Recap/DoctorWhoS3E4TheDaleksMasterPlan}} The Daleks' Master Plan]]" they use [=TARDIS=]-like time vessels, but in "[[{{Recap/DoctorWhoS4E9TheEvilOfTheDaleks}} The Evil of the Daleks]]" and "[[{{Recap/DoctorWhoS21E4ResurrectionOfTheDaleks}} Resurrection of the Daleks]]" they use portal-style "time corridor" technology. (According to fanon, their minds are too hidebound to be really comfortable with the job of navigating a time vessel.) But then in the 21st-century series, the Cult of Skaro, at least, have time-vessel capability built into their power armour.
* ''Franchise/StarTrek'' often uses ''Back to the Future''-types, especially ''Series/StarTrekVoyager'' and ''Series/StarTrekDeepSpaceNine''. [In fact, the Federation has a TimePolice force, the Department of Temporal Investigations.] They've used other types from time to time (no pun intended) though:
** Timecop-style in the ''Series/StarTrekVoyager'' episode "Relativity"
** a Time Portal in the ''Series/StarTrekDeepSpaceNine'' episode "Time's Orphan", the ''Series/StarTrekTheOriginalSeries'' episode "The City at the Edge of Forever" and the [[Film/StarTrek 2009 film]].
** The ''Series/StarTrekTheOriginalSeries'' episode "Return to Tomorrow" was the first episode in which the crew deliberately used a time-travel mechanism they'd stumbled across accidentally in an earlier episode. They flew at warp speed very close to a star, and by controlling the vector with which they pulled away they travelled to a specific time in the past.
** A Terminator style in the ''Series/StarTrekEnterprise'' episode "E-squared".
** TimeDilationField in the ''Series/StarTrekVoyager'' episode "Blink of an Eye" and the ''Series/StarTrekTheOriginalSeries'' episode "Wink of an Eye". Or vice versa, maybe...
** And a unique sort of time travel in the ''Series/StarTrekVoyager'' two parter "Year of Hell": You couldn't actually go forward or back, but you could delete objects from time. This would negate all changes caused by that object (except that time travellers and other ships with "temporal shields" were not affected).
* ''Series/SevenDays'' has a ''{{Terminator}}''-type that goes back, you guessed it, exactly seven days, except when it's eight days one time due to an upgrade.
** Or seven years in one case due to another alien ship crashing, providing more fuel.
** Or only a couple days due to an unexplained breakdown. Honestroy, the Sphere broke down more times than it worked right.
* ''Series/PhilOfTheFuture'' has the Diffys' van as a time machine. It's always broken, though, for some reason or other.
* ''Series/KamenRiderDenO'' has time-traveling trains, which generally work in ''Film/BackToTheFuture'' fashion. The biggest difference is that you can't travel freely: the trains require a ticket to a specific point in time[[note]]created by "scanning" an individual with a blank ticket, which then registers the date of an extremely strong memory[[/note]], and then can only go between that time and [[SanDimasTime the "present"]]. There's also an extremely rare Infinity Ticket that lets the bearer go whenever he wants, but the [=DenLiner=]'s Owner has it and only lets the heroes use it in times of immense crisis.
[[/folder]]

[[folder:Pinball]]
* ''Pinball/JunkYard''[='=]s eponymous location allows the player to [[NostalgiaLevel start a mode from an earlier Williams title]]: [[Pinball/TheAddamsFamily "Mamushka"]], [[Pinball/AttackFromMars "Saucer Attack"]], [[Pinball/CreatureFromTheBlackLagoon "Move Your Car"]], and [[Pinball/Terminator2JudgmentDay "Payback Time"]] on earlier machines.
* The Loony Machine of ''VideoGame/LoonyLabyrinth,'' which was hidden in a maze and built by ancient {{Precursors}}.
** The Loony Machine returns in ''VideoGame/MadDaedalus,'' albeit in a supporting role in the backstory.
* ''VideoGame/ProPinballTimeshock'' has a large cylindrical ball lock that is used to travel back in time.
* Creator/DataEast's ''[[Pinball/TimeMachineDataEast Time Machine]]'' has a morphing car in an unsubtle ShoutOut to ''Franchise/BackToTheFuture''.
[[/folder]]

[[folder:Tabletop Games]]
* ''TabletopGame/FengShui'' uses the Time Portal method of going through time. Characters travel time by means of going through the Netherworld, a weird mystical realm made up of loamy grey tunnels as well as whatever stuff its inhabitants can Shape into being that acts as a PortalNetwork between different junctures in time. The main method of effecting changes in the timestream is by capturing or destroying Feng Shui sites, [[PlaceOfPower Places Of Power]] that generate Chi.
[[/folder]]

[[folder:Video Games]]
* The first ''VideoGame/ApeEscape'' is built off of this: main antagonist Specter, a white monkey that got his hands on a helmet that supercharged his intelligence, uses a newly invented time machine to attempt to change history so that monkeys ruled the world, and main protagonist Kakeru (Spike in the dub) must use the same machine to go after him.
* In ''VideoGame/{{Scribblenauts}}'', you can summon a time machine that can take you to a few predetermined time periods. One of these led to a [[MemeticMutation meme]]:
-->'''''"I FUCKING TRAVELLED THROUGH TIME AND JUMPED ON A DINOSAUR AND USED IT TO KILL MOTHERFUCKING ROBOT ZOMBIES."'''''
* ''VideoGame/ChronoTrigger'' has an interesting mix of three types: the Epoch is ''Back To The Future''-type, while the Timepod is a ''Terminator''-type, and the gates are Time Portal-types.
* ''TheJourneymanProject'' uses a ''{{Timecop}}'' approach (which helps since that's what the player is), depositing the agent at points where time has gone all ass-over-teakettle... by comparing all of history to a [[MagicFloppyDisk flimsy CD containing all known history]] or something (lolwut?). Each trip has a time limit that seems surprisingly lenient, as long as the agent doesn't achieve catastrophic failure.
** The sequel has a cooler time machine entirely self-contained within a metallic space suit (mobile TARDIS-type?). In addition to allowing instantaneous time travel, the suit has a cloaking mechanism, a temporal anachronism detector, and permits instantaneous translation of the written and spoken forms of all languages (except Latin written backwards). Notably, the suits worn by the live action actors in the game's {{cutscenes}} were designed by the same group responsible for the suits from the [[Film/TeenageMutantNinjaTurtles Turtles]] films.
** The third game has a modified version of the spacesuit time machine, equipped with holo-projectors and voice synthesizers, allowing the wearer to imitate any person he scans. This is done so the player can actually interact with characters in the past (and get punched by GenghisKhan).
* ''VideoGame/TalesOfPhantasia'' has a combination of TARDIS- and Terminator style time machine in the sunken city of Thor. It can send the user anywhere in time and space but does not come with them. The game also features TimeTravel by [[AWizardDidIt magic spell]], but only two [=NPCs=] can use that spell.
* [[SwordOfPlotAdvancement The Master Sword]] in ''VideoGame/TheLegendOfZeldaOcarinaOfTime'' is a Time Portal that transports Link 7 years into the future when he picks it up (also aging his body in the process, so it shows traits of a Time Dilation Field as well), and 7 years back when he returns it to the Temple of Time.
** The ocarina can also move objects in time, as is shown during the ending scene of ''Ocarina of Time'', and exploited more fully in the sequel ''VideoGame/TheLegendOfZeldaMajorasMask'', where it can take Link to the start of the three day cycle, setting up that game's GroundhogDayLoop.
** In ''VideoGame/{{The Legend of Zelda Oracle|Games}} of Ages'', the Harp of Ages can at first only open Time Portals in fixed spots, is later upgraded twice: The first upgrade makes it Timecop-style, transporting Link to the past while opening a return portal; the second upgrade allows Link to freely between the game's two time periods; the present, and 400 years into the past.
* In ''VideoGame/{{Achron}}'', human and vecgir players can build chronoporters / slipgates (which act as ''Terminator''-type projectors) while grekim units can all time travel without external assistance (making them living ''Back To The Future''-types).
* The Alpha and Beta suits from ''VideoGame/TimeShift''. The beta suit has the interesting adaptation that damage to the 'jump' drive allows you to use time powers.
** Actually its designed to work that way, the jump drive just lets you go back and forth much more greatly than the 10, 15 seconds you can in combat. It was designed for military purposes, presumably they would remove the jump feature so everyone couldn't screw with the timeline.
* [[ThoseWackyNazis Dr. Richtofen]] from ''NaziZombies'' found that the Teleporter is capable of time travel through overcharging it with Element 115: first on accident, bringing them to an abandoned theatre in Berlin, 1962; then on purpose to present-day Siberia.
* ''VideoGame/MagicalGirlLyricalNanohaAsPortable: The Gears of Destiny'' has a time machine [[LostTechnology Lost Logia]] as central to the plot. Unfortunately, normal humans can't use it since it puts too much strain on their bodies. [[spoiler:RidiculouslyHumanRobots, on the other hand...]]
* SeriousSam has a interesting take on the time machine, the [[http://www.serioussam.wikia.com/wiki/Time-Lock Time-Lock]] The machine itself is a stationary object found in Eqypt, you can only travel backwards and only to another time the machine was 'armed'.
* ''VideoGame/{{Persona 3}} FES'' has multiple doors which open to different points in the main cast's history. Most of these doors only allow you to see what is happening and not interfere but the door in the lounge of the dorm travels to the mall where they can interact with what is happening. [[spoiler:This door is eventually used to travel to the moment when the SilentProtagonist makes his HeroicSacrifice.]]
[[/folder]]

[[folder:Visual Novels]]
* Time travel is the theme of ''VisualNovel/SteinsGate'' and there are a couple different kinds. Or rather, there's one kind, but how well you can use them is fairly limited. SERN in the future has your classic go back in time kind of machine [[spoiler:as does Amane Suzuha]] but the device normally seen in the present, the Microwave Phone, is only able to send small data packets. If you go over the threshold protected size in any time travel, errors appear, which for physical objects is turning into a mysterious green goo. Data merely gets corrupted and cut off after the size limit is reached. Naturally, this is hard to work with.
[[/folder]]

[[folder:Web Comics]]
* In ''{{Homestuck}}'', Dave gets a pair of turntables that can accelerate or reverse the flow of time around him. He uses them to go back to the past to SetRightWhatOnceWentWrong. The turntables also have the distinction of being one of the very few forms of time manipulation in the series that doesn't outright create {{Stable Time Loop}}s (thanks to the universe's built-in precautions against {{Temporal Paradox}}es).
* ''Webcomic/BreakpointCity'' has a few of these. We've seen two cars, a portal, and a brain swapper.
* In ''Webcomic/TimesLikeThis'', the time machine in question is a handheld device cobbled together from a cell phone, two lasers and a piece of [[GreenRock Sesquicentium]]. Once activated, temporary time portals (or "time windows") can be generated at will.
* The various starship drives in ''{{Webcomic/Starslip}}'' are kind of incidentally time machines of the TARDIS type. There's also Deep Time's timesuits, which are also TARDIS-like, but in suit form.
[[/folder]]

[[folder:Web Original]]
* Wiki/SCPFoundation: [[http://www.scp-wiki.net/scp-1968 SCP-1968]] is a bronze torus of unknown origin. Officially it merely alters a person's memories so that they do not match current historical records. The truth, and what makes it qualify for Keter status, is that it's actually a time machine. The person's memories don't match history because of RippleEffectProofMemory. The Foundation is keeping the torus on hand as a last resort. They speculate that this might not be the first time someone used it to save the world either, but there's no way to confirm it.
* Danny from ''WebAnimation/BravestWarriors'' built a time machine so he could kick the crap out of his childhood bullies and tell his past self to wear more flattering clothing. When his friends expressed concerns that doing so might cause a TimeParadox or [[TimeCrash worse]], he dismissed them claiming that if anything went wrong his future self could go back in time to destroy the time machine. [[TemptingFate Immediately after he says this]], Danny's future self appears and smashes the time machine to pieces with a bat. Wallow claims this happens every time someone builds a time machine.
[[/folder]]

[[folder:Western Animation]]
* ''WesternAnimation/SouthPark'', as implied in the page quote, featured a ''{{Terminator}}''-type machine in one episode.
* In ''JemAndTheHolograms'', Techrat uses his own ''{{Timecop}}''''-type TimeMachine to send the ''JemAndTheHolograms'' back in time in "Journey Through Time."
* ''{{Meet the Robinsons}}'' features a TARDIS-type time machine: It is essentially a jerry-rigged (flying) car like the [=DeLorean=], and can be driven like a regular car, but has instantaneous space/time-travel capabilities as well.
* The ''KimPossible'' movie ''A Sitch in Time'' had an ancient Time Monkey Idol that created a [[PortalToThePast Time Portal]] used by the villains, and unexplained Time Portal-opening watches for the heroes.
* ''WesternAnimation/{{Gargoyles}}'' has a few episodes with a TARDIS-style amulet, the Phoenix Gate. The characters can't use it to change the past [[StableTimeLoop because they didn't]]. Time travel's funny that way.
* ''TheAdventuresOfJimmyNeutron'' has one (in "The Tomorrow Boys"); the Chrono-Arch. This is a Terminator-like type of time-travel machine ([[spoiler:Jimmy had to find it back when he went 15 years into the future, which he luckily did]]), and has an additional view-mode.
** Additionally, in "The League of Villains", Jimmy built a wormhole generator: [[spoiler:the Wormhole Generator 9000. The invention sent all of Retroville (except Jimmy, the gang and Tee) to the prehistoric past with no hope of ever returning, until Jimmy appears]]. This can't really count as a time-traveling-machine, though, since [[spoiler:Jimmy had to disrupt the wormhole in order to get all of Retroville back to their time (leaving the bad guys in the past)]].
** In another episode, Jimmy invented a small gizmo which could accelerate or reverse time. [[spoiler:And he ended up in the past by it, so he had to use ''BambooTechnology'' in order to get them back. Ultimately, someone uses the gizmo on all of Retroville, sending them back to the point where the adventure didn't even start! "''Deja vu''"!]]
* In ''WesternAnimation/XiaolinShowdown'' the ineffectual villain Jack Splicer had apparently built a working Terminator-style time machine years ago. It only goes backwards and there's no forward counterpart since he was never able to provide sufficient power to make it useful (he could only go back two seconds in time).
* Squidward uses one of these in the ''WesternAnimation/SpongeBobSquarePants'' episode "SB-129", trying to go back to the past after being stuck in the future as a HumanPopsicle.
* In ''WesternAnimation/BeastWars'' any ship equipped with Transwarp Cells has Film/BackToTheFuture style time travel. This includes ships that were never intended for TimeTravel, like the Autobot Shuttle the Maximals use at the end of the series.
** The whole Golden Disc plot involves the original Megatron leaving a message for his descendants, expecting transwarp drives to develop to the point where they can be used to travel to a specific point in time in order to alter the course of the Autobot-Decepticon war.
** The ridiculous point is the episode where the Maximals start sending out transwarp probes to search all of time and space for Optimus Primal and his crew. The amazing thing is that they almost succeed, considering this is an impossible task, and the probes can't scan for shit (it passes right above the stranded Maximals and doesn't see them or the ''Axalon''). There's also the question of why they'd go into all this effort to find them, given that they're not terribly important figures. Optimus Primal is not the leader of the Maximals unlike his ancestor.
** Doc Greene finds one in ''WesternAnimation/TransformersRescueBots''. It was built in 1939, and the only reason it remained unused for so long was because there was no power source capable of sustaining it until nuclear power was invented.
* In ''WesternAnimation/BackToTheFuture: TheAnimatedSeries'', the [=DeLorean=] is a TARDIS-type.
* [[RockyAndBullwinkle Mr. Peabody's]] WABAC (Wayback) Machine took him and Sherman to visit historical figures.
* The ''WesternAnimation/DangerMouse'' episode "The Hickory Dickory Dock Dilemma" had a grandfather clock that took the hero and his assistant Penfold through time, from prehistoric days to a future London. Contained a gratuitous ''DoctorWho'' reference.
* ''WesternAnimation/RandyCunninghamNinthGradeNinja'': [=McFist=] had Viceroy build one in "Randy Cunningham: 13th Century Ninja". To Viceroy's disappointment, instead of using it to destroy the Ninja, [=McFist=] wanted to use it to travel back to a time his favorite breakfast cereal still hasn't been discontinued.
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[[folder:Real Life]]
* TruthInTelevision / PortalToThePast - Okay fine, only sort of. But during the controversy over the Large Hadron Collider in the run-up to its activation, as media all over the world started blabbering about the end of the world due to some pretty poor evidence, some supporting scientists put out a reassuring theory. Apparently, after some calculations were done, it proved more likely that time travellers would come out of the first full power collision, than the LHC bringing about the end of the world. There's a chance someone in the future will make a machine that can target wormholes in the past and use them for time travel, if they know about them. Given that the LHC ''may'' be capable of generating wormholes with fraction-of-a-second long lifespans, this may give them a 'year zero', an earliest point for time travellers to come back to, as it would be the first instance of a wormhole forming close enough to Earth to be useful. The LHC has not made a full power collision yet.
** Also in real life, Dr. Ronald Mallett has proposed a time machine that works more on lasers and particles than macroscopic objects, but otherwise is quite similar in manner of operation to the system from ''Primer'', described above.
* Any sort of FasterThanLightTravel, such as the [[http://en.wikipedia.org/wiki/Alcubierre_drive Alcubierre drive]], could theoretically travel back in time. This would technically be Film/BackToTheFuture-type, but given that this one can go a ''lot'' faster than 88 mph, it's somewhat TARDIS-type.
** Except the key thing with the Alcubierre drive is that it avoids any time dilation effects because the ship is "stationary" within the bubble so the ship wouldn't actually travel back in time but could still arrive before a light pulse.
* If you had a wormhole and used time dilation to make time pass faster on one end, you would eventually get a [[PortalToThePast time portal]].
** A [[http://en.wikipedia.org/wiki/Krasnikov_tube Krasnikov tube]] would be similar to this. It's built with the ends at different times. The entrence and exit time match the departure and arrival times of the space-craft making it. If you built one and went through it, you'd arive a little after you left. But if you spend ten years building one in a giant circle, then anyone from the future can follow you back.
* A [[http://en.wikipedia.org/wiki/Tipler_cylinder Tipler cylinder]] would technically be a Time Dilation Field that lets you go back. Specifically, it skews time and space so moving to one side takes you back in time a little. If you move in circles around it fast enough, you go back in time. Practically, it's Portal To The Past.
* The current physics models predict that if faster-than-light travel is possible, time travel is also possible; that as far as we know neither is possible; but that if you could travel into the past, it would create a StableTimeLoop, and you wouldn't be able to change any history. A few models add that [[MadeOfExplodium everything nearby would explode]] the moment you (or anything else) arrived in the past, or even at the moment the two ends of the wormholes approached near to each other within space.
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