A device that allows travel between [[AnotherDimension dimensions/alternate universes/planes of existence/etc]]. This device could be anything, from a machine in science fiction to a magical item in fantasy, as long as it allows travel between these dimensions or realities. It could even be a human (or, at the very least, a sentient being), if they have the power to go to these other "places".

Compare TimeMachine and InnBetweenTheWorlds.
----

!!Examples

[[foldercontrol]]

[[folder: Anime and Manga ]]

* ''Manga/MahouSenseiNegima'''s [[spoiler:Chao Lingshen]] eventually [[TimeTravelTenseTrouble will has developed]] one of these, allowing characters to hop from one time-travel-created timeline to the next.
* The ''Franchise/LyricalNanoha'' has [[CasualInterstellarTravel Casual Inter-Dimensional Travel]], with various MagiTech starships allowing those who can't perform sufficient magic to go travel to different dimensions. Supplementary material set after ''VideoGame/MagicalGirlLyricalNanohaAsPortable: The Gears of Destiny'' also had the Eltria group discovering a piece of LostTechnology that allowed them to move people from one [[AlternateUniverse Alternate Multiverse]] to another, a function they learned after some irresponsible handling of the newly discovered artifact caused it to pull in TheMovie continuity version of Nanoha and Fate.

[[/folder]]

[[folder: Fanfiction ]]

* In the ''Film/{{Thor}}''/''Series/BeingHuman'' crossover series, ''FanFic/{{Housemates}}'', Dr. Strange devises one for Coulson's and Mitchell's universe hopping in the form of a ''smart phone app''.

[[/folder]]

[[folder: Film ]]

* ''Film/TheOne'' has a quantum tunneling device which allows the interdimensional police to track criminals and, obviously, allows them to travel to different universes.
* ''{{Crossworlds}}'' has a staff which can get the main characters from the odd world from which the staff comes and back to what appears to be our Earth.

[[/folder]]

[[folder: Literature ]]

* In the ''{{Paratime}}'' series by H. Beam Piper, the means of traveling through timelines is a conveyor using the Ghaldron-Hesthor field-generator. Conveyors are fixed in place, which means that as they travel through timelines, they may end up inside nuclear reactors or other hazards or be caught in warfare (a common activity on at least one timeline in nearly every trip, Paratimers note). Weakening of the transposition field is a concern of Paratimers.
* In Creator/RobertAHeinlein's ''Literature/TheNumberOfTheBeast'', Professor Jacob Burroughs creates a device that allows travel between dimensions. It's installed in a vehicle and allows the protagonists to go on a series of adventures.
* ''Franchise/TheDarkTower'' series has doors that allow the characters to travel between different timelines and alternate universes, including one in which [[spoiler:they meet the author, Creator/StephenKing]].
* ''Literature/TheChroniclesOfNarnia'': Several times:
** ''Literature/TheLionTheWitchAndTheWardrobe'': has a wardrobe that allows travel between Earth and Narnia -- sometimes.
** Susan's horn has the power to summon help to the user, which includes help that just happens to be in another dimension, as shown in ''Literature/PrinceCaspian''.
** ''Literature/TheMagiciansNephew'' has the green and yellow rings, which allow one to enter the Wood between the Worlds and leave there for any number of worlds. The rings are mentioned again in ''The Last Battle.''
* ''[[TitusCrow The Transition Of Titus Crow]]'' has a clock that allows Titus Crow to travel to different dimensions.
* ''Literature/HisDarkMaterials'' has items that allow for interdimensional travel.
* ''MythAdventures'' has the D-Hopper which is used throughout the series to get to different universes.
* ''[[HaroldShea The Incomplete Enchanter]]'' by Creator/LSpragueDeCamp and FletcherPratt introduced the Syllogismobile which attuned the practitioners' minds to a selected alternate universe strongly enough to shift them into it.
* In ''[[Literature/TheNeanderthalParallax Parallax Hominids]]'' by Robert J. Sawyer, decoherence created by a quantum computer sends the neanderthal Ponter to a universe very similar to our own.
* In Creator/PhilipJoseFarmer's ''Literature/WorldOfTiers'' novels, people can travel between the artificial universes of the setting by using gates. Gates can be activated by various means, including tokens and playing music on a special horn.
* ''Literature/TheWheelOfTime'' has Portal Stones which, among other things, will let people travel between parallel realities.
* ''Literature/TheLongEarth'' by Terry Pratchett and Stephen Baxter. Interdimensional travel is performed by the use of a Stepper, the designs for which appeared online one day. Its components are common enough to be bought from the local shops. And include a potato. [[spoiler:Except it turns out the Stepper device is more to do with providing a kind of mental focus - the protagonist learns he can Step without a device. ]]. Also unique is the fact that, unlike most other examples where parallel universes may diverge in recent history but are still recognisably similar to our own Earth, the parallel universes of the Long Earth are wildernesses devoid of human life. Only our own Earth evolved humans.
* The titular carnelian cube in The Carnelian Cube sends one into a parallel world based on their desires at the time one sleeps with it beneath their pillow. In order to leave to another world one must find its counterpart in that particular world.

[[/folder]]

[[folder: Live Action TV ]]

* There are several "techniques" of universe-crossing in ''{{Fringe}}'': Walter's portal, which causes both universes to begin collapsing; William Bell's technique by which he pulled Olivia into the AU (usually only works on hybrid {{Super Soldier}}s who are designed to survive the crossing; it worked on Olivia because of her Cortexiphan-enhanced physiology); and the natural way, which is achieved by groups of Cortexiphan Kids being guided by Walter (and of the three, is clearly the least dangerous, to dimensions and dimension-crossers, but not without its kinks). Besides crossing, Peter is able to use the device created to only work with his genetics to bridge the to universes creating an InnBetweenTheWorlds. This unlike the other devices such as Walter's portal device has no know negative side effects. Another less used method is the harmonic rods which create an equilateral triangle enveloping the subject on both sides, and have the rods vibrate at the same frequency, and two objects of approximately equal mass will exchange places in space-time. There are many ways to mess this up though, such as only placing the rods in one universe.
* ''Series/StargateSG1'' has the "quantum mirror", which makes a few appearances in early episodes before being destroyed offscreen, on O'Neill's orders. In one episode, Daniel accidentally uses it to travel to another universe; in a later episode, alternate-universe versions of Carter and Kowalski come back through it, looking for refuge from the Go'a'uld invasion fleet that just arrived on Earth in their universe.
** A later episode has a strange phenomenon that causes hundreds of SG-1 teams from alternate realities to start popping up in the "main" SGC. It turns out that the phenomenon was caused by [[spoiler:the first alternate SG-1 team to arrive, who wanted to steal the "main" reality's ZPM]].
* In ''Series/StargateAtlantis'', an alternate [=McKay=] builds an "alternate reality drive" which has this function. The only problem is, it doesn't have an off switch or any way to control which reality it jumps into. This leads to one universe's worth of main characters being stranded in the wrong reality and another universe's worth dying of starvation before they can figure it out, before the actual main characters bootstrap on their research and discover a way to make it backtrack through the realities it came from (so they can at least get home, if not actually exploit the drive).
** Another episode has [=McKay=] try to use a device to generate unlimited energy by getting it from an alternate reality. Unfortunately, this ends up nearly destroying an inhabited universe, so the alternate [=McKay=] uses the "bridge" to cross over into the "main" reality. At the end of the episode, they send him back.
* ''{{Sliders}}'' had the "Timer", several of which were actually used by the main characters (the original, the one from Egyptian World, and Colonel Rickman's Timer). The Timer's job was to open wormholes between universes, and also to [[PhlebotinumBreakdown malfunction]] [[MacGuffin or get stolen]], [[PlotDevice providing half the series' plots]].
** The Kromaggs have a more advanced version, which they use to conquer human worlds. In their first episode, they use a device taken by one of the Sliders to track them down on another world. However, it turns out that they didn't invent sliding technology. It was [[TooDumbToLive given to them by Quinn's double]] (the one from the pilot) to escape from their Earth, where they were fighting with humans. Later on, they try to use human brains to build instantaneous portals that work on a different principle than sliding tech in order to bypass the Slidecage.
* ''Series/DoctorWho'':
** In [[Recap/DoctorWhoS7E4Inferno "Inferno"]], the TARDIS console transports the Doctor to a parallel universe where Britain is governed by Fascists.
** In [[Recap/DoctorWhoS28E5RiseOfTheCybermen "Rise of the Cybermen"]], the entire TARDIS travels to another parallel universe (usually referred to as "Pete's World") where Britain is a republic and [[ZeppelinsFromAnotherWorld zeppelins are in common use]]. In [[Recap/DoctorWhoS28E12ArmyOfGhosts "Army of Ghosts"]] the inhabitants of Pete's World develop transporter medallions that can travel between the dimensions; later, they create a "dimension cannon" for the same purpose.
** The Time Lords did this on a reagular basis before they died out.
* In ''TheMonkees 1997'' ABC special, ''Hey, Hey, It's the Monkees'', we learn that Mike had turned [[CoolCar the Monkeemobile]] into a dimension machine (AND lowrider, of all things). It's even capable of transporting them back to TheSixties.
* In ''Franchise/StarTrek'', transporters under the right circumstances can be used to travel between dimensions. One way is to add a device to the transporter that reconfigures it for this use.
* ''Series/BuffyTheVampireSlayer'' and ''Series/{{Angel}}'' had at least one of these, Angel used it to travel to Jasmine's old home. And another was used to travel to Skip's holding dimension where Billy was being kept. The 'verse's portal books probably count as well.
* Jefferson's hat in ''Series/OnceUponATime'' can be used to travel between the different worlds.
* The Cyber Museum from ''Series/MythQuest'' lets Alex and Cleo select a historical artifact and enter a myth associated with the culture it came from.

[[/folder]]

[[folder: Tabletop Games ]]

* ''DungeonsAndDragons'' has had a number of such devices, like the Amulet of the Planes and the Cubic Gate.
** There's ''way'' more, from portals disguised as mirrors and ordinary doors that only activate when a certain combination of objects (a "portal key") are presented to them, to various high - level spells that can take you to such places as the Astral Plane, the Plane of Elemental Fire, or planes that house the afterlife.
** Module Q1 ''Queen of the Demonweb Pits''. A temple in a Drow city has a mural of a starry sky. If the {{PC}}s pass through an image of Lolth and touch it, they will be transferred to the level of the Abyss where Lolth's Demonweb exists. Once there they can find doorways to alternate Prime Material Planes as well as the Abyssal level where Lolth's spider ship awaits them.
** Module X2 ''Castle Amber''. The Gate of the Silver Keys takes the {{PC}}s from Glantri in the Known World to the dimension where the country of Averoigne exists.
* ''TabletopGame/{{Paranoia}}'' had the Transdimensional Collapsatron, which allowed travel between dimensions in several adventures.
* One of the campaign settings for ''{{GURPS}}'' has the {{PC}}s as interdimensional travelers, using a variety of devices ranging from handhelds to gates to vehicles.
* ''TabletopGame/{{Champions}}'' adventure ''The Great Supervillain Contest''. The Crimson Claw's base had the power of interdimensional teleportation. It was originally a dimensional exploration ship: when it entered his home dimension, the Claw [[VampiricDraining drained]] the LifeForce of the crew and stole it.

[[/folder]]

[[folder: Toys ]]

* In ''{{BIONICLE}}'', the [[MaskPower Olmak]] can do this.

[[/folder]]

[[folder: Web Comics ]]

* In ''WebComic/DragonBallMultiverse'', some guys called the Vargas have one; it drives the plot, as they're able to cross between universes (timelines). They come from a different universe than the one the protagonists live in, and they offer them a chance to participate in a tournament among fighters from different universes. [[spoiler:One of them is hijacked by King Vegeta and the Saiyans of Universe 10 in a coup de'tat. But this part of the plot is in a galaxy far, far away... and only discussed in the novelization.]]
* Featured in ''Webcomic/MSPaintAdventures'':
** In ''ProblemSleuth'', there two ways to travel between the real world and the world of imagination: Either climbing through a window, or entering a fort and imagining really hard (booze helps with the latter).
** ''Webcomic/{{Homestuck}}'' features fenestrated walls. Normally they're used to observe faraway places, but smashing through the wall allows one to travel to the location. Andrew Hussie breaks through one of these walls to get from his house in RealLife to Doc Scratch's house in the trolls' universe. Later, [[spoiler:Jade and John use another of these walls to escape a universe that's being written out of existence]].
* In ''BobAndGeorge'', [[http://www.bobandgeorge.com/archives/000528c they send the Author back through one.]]
* In ''SluggyFreelance'' Riff invented the Dimensional Flux Agitator (DFA), originally to blast [[KillerRabbit Bun-]][[TheThingThatWouldNotLeave -bun]] into a random alternate universe. [[EpicFail He and Torg ended up standing on the wrong side and sent themselves instead]]. He later built a remote allowing people to come back. [[EpicFail In theory]].
* A one-shot character in ''ThreePanelSoul'' tore his way into a parallel reality that was... [[http://threepanelsoul.com/2011/06/12/on-sliding/ a bit more parallel than most]].
* In ''Webcomic/ElGoonishShive'', Nioi [[http://www.egscomics.com/index.php?id=548 possesses]] one of these which also seems to [[http://www.egscomics.com/index.php?id=461 function]] as a CrystalBall.

[[/folder]]

[[folder: Web Original ]]

* In Blackbird's ''{{Aniverse}}'' setting, the hammerspace drive, which can fit in a character's pocket and allows travel into {{hammerspace}}, which connects various zones in different dimensions. For example, in the "{{Kawaii}}" dimension, there's a Happy Bunny Forest zone, which is an ''entire universe'' filled with ExactlyWhatItSaysOnTheTin. In the "Boring" dimension, there's Tokyo Prime, a universe where Tokyo is the center of everything, but nothing ever happens there, and so on.

[[/folder]]

[[folder: Video Games ]]

* In ''VideoGame/ChronoCross'', Serge uses kids astral amulet to travel between his world and the other world which was created 10 years ago due to a universal split where Serge is alive in one universe and dead in the other. See SchrodingersCat
* In ''VideoGame/CrashTwinsanity'', the psychetron created by Dr. Neocortex can travel between Crash's world and the 10th dimension and most of the game is based around gathering the power crystals needed to power the device so Crash Bandicoot can get to the 10th dimension to save his world.
* The "ancient ruins" that are the goal of ''VideoGame/{{Touhou}} 3: Phantasmagoria of Dim. Dream'' turn out to be a Hyperprobability Space Vessel used by Yumemi and Chiyuri to travel from their own world to Gensokyo in search of the secrets of magic.
* While not a device, there are two main methods shown in ''VideoGame/TheLongestJourney'' and ''VideoGame/{{Dreamfall}}'' that allow travel between the various worlds. Shifters are people who physically travel via portal they themselves open. Normally they can only travel between Stark (the world of technology) and Arcadia (the world of magic). April actually had to fly into space in Stark in order to get to the Guardian's Realm via a wormhole of some sort. The sequel also introduces Dreamers, people who fall asleep in one world and project a physical double into another one. The reason both types of people are able to cross between worlds is because all these worlds used to be one until they were split up by powerful wizards and scientists with the help from some space dragons in order to keep the world from the being destroyed.

[[/folder]]

[[folder: Western Animation ]]

* ''FamilyGuy'', Stewie invents a remote control that can travel to many universes, including one where Meg is hot, but still ugly compared to everyone else.
* ''{{Futurama}}'': Professor Hubert Farnsworth invents the parabox which allows travel to different realities, including one where Fry and Leela are married.
* On ''TeenageMutantNinjaTurtles'', the Turtles use the transdimensional portal, a technology that allows travel to alternate universes. It is most commonly used in the 1987 cartoon series. Another approach is used in ''TurtlesForever''; the teenage mutant ninja turtles use a dimensional portal stick to go to the 1987 universe.
* In ''PhineasAndFerbTheMovieAcrossThe2ndDimension'' the Other Dimension-inator is used by Heinz Doofenshmirtz to go to the second dimension, as the title suggests.
* ''WesternAnimation/{{WITCH}}'' has several magical items that allow travel through dimensions, with the Seal of Phobos (and later the Heart of Candracer after it absorbs the seal) being the first example shown and the Mage's ring and the Tonga Tooth necklace in the second season. Elyon, the Heart of Meridian, can open Folds with her power and jokingly laments that she doesn't get any new jewelry like the others.
* Rick Sanchez of ''WesternAnimation/RickAndMorty'' has a handheld portal gun that shoots out a portal to a dimension of his choosing.

----