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Another Dimension that is not so "other", Pocket Dimensions are spaces that are too small or too easily accessible to be truly considered a separate dimension and are referred to as a small extra pocket of space that is attached to our own. Much like an actual pocket, they are often used for some extra space where you can get things Bigger on the Inside. A Speculative Fiction favourite, the uses are plentifold. Storage for a Bag of Holding, hiding places, transportation, an explanation for physics-defying superpowers: a Pocket Dimension can do them all. Can't make julienne fries though.

Also can serve as a (sometimes unstable) Small, Secluded World with its own ecosystem and lifeforms. This is a quite handy place for keeping some nasty lurksome monsters; it lets them be very alien and make intermittent contact.

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See also Just One Second Out of Sync which is often exactly the same but explained in terms of a temporal fashion than a spatial one.


Examples:

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    Anime & Manga 
  • Tengen Toppa Gurren Lagann: The place where the Anti-Spirals retreat to when they're not busy wiping out any Spiral races that they feel have gotten too large.
  • In addition to Doraemon's Bag of Holding pouch on his stomach, his time machine is also parked in a pocket dimension accessed from Nobita's desk.
  • The first episode of Haré+Guu reveals Guu's stomach contains a secluded world with things like cats with dozens of legs, crazy buildings, as well as a friendly couple who've been in there a while!
  • Negima! Magister Negi Magi has a number of Pocket Dimensions around; Kaede's magic cape contains one, and Mana uses one to store her ammunition. Also there are Evangeline's castles, Theodora's diorama sphere and Evangeline's Magia Erebea scroll.
  • In Naruto, Tobi can open a gate to his own pocket dimension with his Sharingan, which is a black void full of white boxes. Turns out it's not only his. Since he has the mate to Tobi's Sharingan eye, Kakashi can access the same pocket dimension.
  • Gluttony of Fullmetal Alchemist has a Pocket Dimension in his stomach.
  • One Piece:
    • Blueno's Devil Fruit allows him to access one by making a door in the air itself. It's not only useful to escape strong enemy attacks, but also perform sneak attacks.
    • Charlotte Brûlée's Devil Fruit power allows her to conjure up mirrors and trap opponents in a pocket dimension she calls "Mirror World".
  • Star Driver has Zero Time.
  • In Saint Seiya, Gemini Saga and later Gemini Kanon's trademark attack "Another Dimension" warps the target into one of these. The really overblown delivery of the line in the Latin American Spanish dub has reached massive memetic mutation status.
  • Fairy Tail: Erza stores some of her weapons and armor in a pocket dimension. Unfortunately for her, the dimension isn't large enough to store all of her gear. She has to rent a lot of space in the Fairy Tail dorms to hold all of her stuff.
  • Bleach: The Quincies were originally based in the World of the Living until a disastrous war with the Shinigami a thousand years ago. The survivors sneaked into Soul Society and hid within the shadows of the Shinigami's key city, Seireitei. Within the shadows they created a pocket dimension containing a "reverse" version of Seireitei. Although the Shinigami spent a thousand years thinking the Quincies were dying into extinction, they never once realised the Quincies were thriving right under their noses all along until the Quincies were strong enough to sack Seireitei and decimate the Gotei 13.
  • The land of Darius in Gaiking: Legend of Daiku Maryu is a pocket dimension located inside the Earth.
  • In Tenchi Muyo!, Kagato's Cool Starship Soja has one where he keeps Washu prisoner and encased inside a Crystal Prison.
  • In the world of Jujutsu Kaisen, both Sorcerers and Cursed Spirits are capable of temporarily projecting a "Domain Expansion", which is seen as the ultimate combat power-up and a mark of maturity among humans and Curses alike. A Domain Expansion is essentially a localised pocket of warped space, constructed from the user's Cursed Energy and usually reflecting an aspect of their inborn Cursed Techniques. Within this pocket, the user's own Cursed Techniques are amplified manyfold and guaranteed to always hit their target, whilst any opponent trapped within can only hope to either take the blow and push through with ludicrous amounts of defensive charms, or try and project their own Domain Expansion to "out-push" that of their enemy - in such a case, the respective amounts of stored-up Cursed Energy determine which Domain succeeds in pushing through the other. Escaping a Domain is practically impossible, although breaking into them from the outside is comparatively simple - then again, unless your name is Yuuji Itadori, doing so would be exceptionally stupid and counter-productive, as it equates to willingly handing your enemy all the cards in your hand. Several major characters within the story have shown the capacity to project their Domain Expansions already, to signify their incredible power levels:
    • Ryomen Sukuna, the King of Curses, is the first Curse to properly introduce the concept of a Domain Expansion, by flexing on a far less powerful Curse to demonstrate how utterly and completely outclassed it now is. His Domain, "Malevolent Shrine", takes the form of a corrupted, demonic Buddhist shrine seated upon an isle of skulls amid a lake of black water. Sukuna's Domain is also rather unique compared to other introduced Domains, since it doesn't actually cut it targets' escape routes completely off - instead, it has an area of effect of roughly two hundred square meters. This means that, by "refusing to flee", as Sukuna sees it, his enemy enters into a "pact" with him - increasing the already stupendous amount of damage done by Sukuna's techniques, allowing him to easily cut his enemies up into Ludicrous Gibs.
    • Satoru Gojo, the strongest living Sorcerer, has a rather mesmerising Domain called "Unlimited Void", which manifests as a literal, swirling void of infinity. Whilst trapped within it, the target becomes overwhelmed with a never-ending stream of new information and sensations, effectively paralyzing them indefinitely and eventually causing them to die. Though Curses can last for a bit longer than humans, this is still the single most powerful use of Cursed Energy this far introduced within the story.
    • Jogo, the Disaster Curse of Earth, has the "Coffin of Iron Mountain", which takes the form of the crater of an active volcano and instantly incinerates almost anyone caught within it, without Jogo having to use any additional Techniques.
    • Dagon, the Disaster Curse of Oceans, has the "Horizon of Captivating Skandha", which is actually a rather pleasant Domain compared to the others, taking the form of a sunny tropical beach lined with palm trees. That is, unless you count the tide of fish-like "Shikigami" Curses which Dagon can instantly summon out of the water to devour anyone caught within. Notably, Dagon's fellow Curses have also used his Domain as a hideaway when resting between missions.
    • Mahito, the Disaster Curse of Humans, eventually develops his Domain, the "Self-Embodiment of Perfection", a mostly featurless black nothingness lined with strings of massive, interlocked hands forming flower-like patterns, making anyone within the Domain literally within the palm of Mahito's hand(s). And, seeing as Mahito's primary weapon is his grisly Touch of Death...
    • Megumi Fushiguro has started developing a Domain of his own, the "Chimera Shadow Garden". Though still developing, so far it has taken the appearance of a mass of fluid shadows flooding into the surrounding area, allowing Megumi to instantly summon multiple "Shikigami" Curses, Teleport Spam from place to place, and create a shadowy duplicate of himself. It remains to be seen what form and abilities his finalised Domain will be able to bring to bear.
  • The Death Room in Soul Eater is Shinigami-sama's personal domain, accessed usually from an imposing but otherwise normal-looking door within the Shibusen, but from his end, it's a door in the middle of nowhere.
  • Powerful mages in the Lyrical Nanoha franchise can create pocket dimensions within the fabric of normal spacetime. In Magical Girl Lyrical Nanoha A's, Reinforce creates two pocket dimensions at once: one to trap Fate in and one to protect her master Hayate while she destroys the Earth, while in StrikerS, Verossa Acous uses a tiny pocket dimension apparently to transport cakes without tarnishing his perfect suit. It is also strongly implied that the Garden of Time from the original series is a part of Mid-Childa's landscape that Precia Testarossa had "sheared off" and placed in her own personal pocket dimension to serve as her base of operations.
  • Witch barriers in Puella Magi Madoka Magica are formed by Witches to conceal themselves, whenever a normal human being is unfortunate enough to stumble upon a barrier by accident, they will be unable to escape from it, which is why a Magical Girl is needed to eradicate the Witches. They also happen to be a reflection of a Magical Girl's past life prior to becoming a Witch, for instance, Oktavia Von Seckendorff has a barrier resembling a concert and one of her familiars, Holger, is a violinist which resembles Kyosuke, the boy whom Sayaka loved, but he never looked back. The only Witch who doesn't need a barrier to exist is Walpurgisnacht.
  • Dragon Ball:
    • The Room of Spirit and Time in Dragon Ball Z is a pocket dimension that consists of an endless void with harsh temperature conditions and 10 times Earth's gravity for Training Purposes. Whis' Staff also holds a pocket dimension similar to this.
    • Hit stores the time that he "skips" in a pocket dimension. He has the ability to phase himself into this pocket dimension to make attacks pass right through him without harming him, but he can only do this for as long as he has "stored time", and given that he only skips fractions of a second, it takes him a while to build up any appreciable time in there.
  • Demon Slayer: Kimetsu no Yaiba has at least two Demons capable of warping space around them to manipulate their surroundings. The first of these, Kyogai, has a number of small drums growing out of his body which he can beat in order to change the inside of his hidden mansion - known effects include changing the gravitational pull inside rooms, swapping out the positions of rooms and doors, and creating gusts of razor-sharp air to rip apart his prey. Nakime, a high ranked enforcer of Muzan Kibutsuji himself, has this ability taken Up to Eleven - she controls an entire fortress of winding, Escher-esque architecture, with countless rooms, hallways, stairs, ladders and floating platforms stretching as far as the eye can see. Fittingly, this massive structure is known as the "Dimensional Infinity Fortress" and is used as Muzans primary base of operations, as well as the setting for the final series of battles. Nakime has been shown to be able to manipulate the entire structure at will, shifting the positions of individual pieces or entire segments, creating and erasing numerous doorways and stairways and liberally teleporting people in and out of the place altogether.
  • Digimon:

    Audio Plays 
  • In the Big Finish Doctor Who audio drama "Grand Theft Cosmos", the Black Diamond contains a self-sustainable pocket universe three light years across.

    Comic Books 
  • Marvel Comics.
    • There are a few pocket dimension versions of Earth itself and beyond. The Heroes Reborn setting was explicitly called a Pocket Dimension, or Pocket Universe, which Franklin Richards literally carried in his pocket. There is also the Alternate Universe of Marvel 1602 which was split off from the main Marvel Universe to prevent all of reality being destroyed and placed into a jewel guarded by Uatu. Another one can be accessed through use of the Soul Gem.
    • Asgard, Olympus, Heliopolis and other godly realms are Pocket Dimensions adjacent to Earth. Some are further sub-divided (e.g. Asgard's "Nine Worlds" include Hel, Muspelheim, Jotunheim, etc...).
    • Mephisto and the other Hell Lords rule the Splinter Realms, which is Hell itself after they had carved it up between them and rule over it as rival Dimension Lords who compete over souls for nourishment and power.
    • The Dark Dimension, ruled by Dormammu, is a large pocket dimension and Dormammu makes it bigger by conquering other pocket dimensions and assimilating them into it, with the long-term goal of unifying it with the main universe itself and ruling over it as an evil God.
    • The Elder Gods Set and Chthon fled into pocket dimensions from their native Earth to escape the wrath of the demon-eating Demogorge. Set in particular has a pocket dimension that is adjacent not only to the mainstream Marvel Earth but to multiple Earths, making him a limited but very dangerous Multiversal Conqueror.
    • The very powerful demon Shuma-Gorath and the Many-Angled Ones have many of these, but they eclipses most other Marvel demons by ruling at least one full-blown Alternate Universe outright (the Cancerverse), and possibly more than a hundred more besides. Shuma-Gorath is the demon that other demons aspire to be.
  • Sonic the Hedgehog (Archie Comics) explicitly explains Zones as 'pocket dimensions' via editor notes. This is most apparent in the case of the Special Zone (equivalent of Special Stages from the games). This is made confusing by the fact that areas within the main dimension are also referred to as 'Zones' to comply with the games' stage names eg. Green Hill Zone, Lava Reef Zone etc.
  • An apparently commonplace practice for Green Lantern officers is to place their lantern-shaped power battery (which they must use to recharge their rings periodically) inside a pocket dimension, so as to have easy access to it in the field. Kyle Rayner keeps his in his apartment, which has more than once worried him while off on another planet, since he might not have enough juice in the ring to get home.
  • Superman:
    • Demon Spawn the Innerverse is a pocket dimension created by Supergirl's dark side which exists inside her mind and is a hell inhabited by demonic monsters.
    • In Supergirl: Cosmic Adventures in the 8th Grade, Argo City was shunted by the shockwave of Krypton exploding into a pocket dimension known as quasi-space.
    • In Post-Crisis continuity, the Time Trapper created a pocket universe which events from the Pre-Crisis/Silver Age Superboy stories took place. Anytime the Legion of Super-Heroes travelled back to meet their inspiration Superboy, the Time Trapper diverted them to there. The only inhabitable planet is Earth (and so was Krypton). In The Supergirl Saga, it became a dead world after Zod, Zaora, and Quex-Ul killed everyone on Earth, following Superboy's death by the Time Trapper, and it was retconned out of existence during Zero Hour!. The reason this was created is because DC had to clean up a Continuity Snarl caused by their Continuity Reboot of Superman, but it only made the snarl worse.
    • Superman gives Batman access to one as a gift in Batman: Prelude to The Wedding. It consists of a lake, a rowboat, and a pair of fishing poles. And fish, presumably.
    • At some point in Two for the Death of One, Lord Satanis and Syrene fight in a very barebones pocket dimension created by the latter. It consists of several uninhabited planetoids.
    • In The Killers Of Krypton, Rogol Zaar's axe drags Supergirl into an extra-dimensional bubble to listen to Appa Ali Apsa's testament.
  • Robin Series: Tim Drake meets a man named Stephen who has access to a foresty dimension that connects to places all over the American east. Stephen uses it for shortcuts since he can always tell which way to go to get to where he wants but he mentions that people or animals can easily get lost in the woods forever.
  • Wonder Woman (1987): Themyscira is more a pocket dimension containing an island populated by immortal women than an island in and of itself. It is not tied or anchored to any one place on the physical realm and can move around as directed by its inhabitants, which Circe once hijacked to shunt it into a larger demonic pocket dimension to trap the Amazons in a war. Time does not move at the same rate on Themyscira as in the larger world and at one point it was entirely unanchored in time too, allowing the place to be used as a Time Machine.
  • In Eternals (2021), all of the Eternals' cities are like this:
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    Fan Works 
  • In A Different Medius, Specter and Akuba barriers are this.
  • In With Strings Attached, the original bodies of the four, and later their cloned bodies, are stored in a pocket dimension, a private stasis pocket.
  • When Worlds Collide Mario Sonic And Mega Man Crossover features a pocket dimension that links Mobius, Earth 20XX, and the Mushroom World together: Bowser, Eggman, and Wily use it as their primary base of operations.
  • The Sweetie Chronicles: Fragments: Sweetie Belle stores her notebook in a Pocket Dimension because it allows her to take it with her as she jumps between Alternate Universes.
  • For Intercom: While Disgust yells at Fear's fear about "being seen" in brain surgery for being in another dimension, technically this is the proper qualifiaction the mind world is. Since it's Riley's mind, it doesn't exist outside of Riley, and can't be reached by anyone but Riley at the moment. But it does have a symbiotic relation with Riley since her emotions help direct how Riley might shape the dimension's use with memory, personality and powering her different thought processes.
  • New Tamaran: Raven creates one for Robin and Starfire to use for their love-making and later comes in handy as they deal with PTSD.
  • In Split Second (My Little Pony) there are several examples so far:
    • The Power Ponies comic book: Sparkle, Thorn, and Cobalt were sucked inside. Sparkle temporarily hijacked its magic to become a Reality Warper, but almost immediately got them ejected. The book has since vanished.
    • The Afterlife, for which Death serves as the Dimension Lord.
    • There are also some areas that are just Bigger on the Inside without being fully separate from the rest of the world.
  • Child of the Storm: It's revealed at the climax that HYDRA's main base exists in a pocket dimension tied to the Battersea power station in central London. The Final Battle is kicked off when a group of scientists led by Jane Foster pulls it out of that dimension into the real world.
  • The Infinite Loops: Literally, since Loopers learn to create a storage dimension within their souls, referred to as "subspace pockets". The size varies depending on the users' power, and only the creator (or Admins) can access them.
  • Casey Steele: One of Casey's powers she got from being a Human Sacrifice, which also serves as an Extra-Dimensional Shortcut, is the ability to create spaces within another dimension that she can access from anywhere and use to go to places that she has never been to before.

    Film — Live-Action 

    Literature 
  • The Other World in Coraline. She even comments about it: "Small world", indicating it's not really another dimension.
    • "Spider webs only have to be big enough to catch flies."
  • In Dark Lord of Derkholm, Mara's specialty is making these. She uses them to hide away the people of cities about to be ransacked.
  • Discworld:
    • The Fair Folk in Lords and Ladies are explained to live in a parasite dimension that just sort of floats around our own, waiting for times when the Theory of Narrative Causality itself allows them to burst through.
    • Death's Domain exists in a similar world. In fact, nearly every anthropomorphic personification has been shown to have or use one of these, from the Kaos to the tooth fairy.
  • In Michael Moorcock's Elric Saga, the Half Worlds where the Beast Lords live.
  • Fablehaven has the transdimensional knapsack. Also serves as a Sealed Room in the Middle of Nowhere for Warren.
  • Making things Bigger on the Inside is one of the most common uses of magic in Harry Potter. A car can have seats like park benches, a tent can have a comfy flat inside, and there's an entire railway platform hidden inside the barriers at King's Cross. Special mention goes to the Hogwarts Room of Requirement, which rearranges itself depending on the needs of whoever finds it. One form of the room is a Super-Sargasso Sea "the size of a large cathedral" that exists entirely for students and staff to hide random crap in. Hogwarts having been around for a millennium by the time of the story, that's a lot of contraband.
  • House of Leaves is about a House that's not only Bigger on the Inside (its external measurements are smaller than it is inside), but also has a door that suddenly appeared and that leads into a big space where normal physics doesn't apply anymore. The space rearranges itself constantly; and when one character enters it and does calculations as to how deep the space goes, it turns out the space behind the House either goes deeper than the diameter of Earth, or that gravity simply works profoundly different there than in our universe.
  • The future human civilization of Implied Spaces uses pocket dimensions maintained by vast post-human artificial intelligences as living space.
  • Invictus: Eliot carries around an invisible one of these. She can fit many objects into it, including people and weapons.
  • The titular protagonist of Johannes Cabal the Necromancer gets briefly trapped in a particularly boring one-because the inventor forgot to create time-or an exit. Cabal's adventure only lasts 30 seconds in the outside world, but to him takes much longer, and only ends when he creates a primitive water clock that measures time in Cabal Chronal Units.
  • The Warrens of Malazan Book of the Fallen function as these, as traveling by Warren is a convenient way for mages to get where they need to go. Kurald Galain, the Warren of Darkness, tends to be the most plot relevant.
  • The Mortal Instruments:
    • That Idris, hidden or not, should be taking up measurable space between France and Germany but remains undetected is attributed to Raziel metaphorically blowing it like a bubble.
    • Faerie is implied to be this. Not merely a place underground, but a small world adjacent to the real one. The majority of which outsiders never get to see (or at least never leave if they do).
    • The City of Bones and the Spiral Labyrinth are also supposed to be this. Hence the Silent Brothers can come and go through various entrances around the world. The warlocks' great library is hidden even from the Clave, although they can apparently deliver supplies to Idris via Portal upon request.
    • Valentine's extradimensional apartment, which is mostly used by Sebastian. Because it exists at a slightly different dimensional "angle" relative to Earth it is nigh-impossible to locate it, as well as anyone or anything inside, magically from the normal world.
  • Skeeve's tent in the Bazaar at Deva in the Myth Adventures series.
  • In the Nevermoor series, there's the Gobleian Library, an easily-accessible dimension which is a near-perfect copy of the titular city. It's used for the Mundane Utility of storing millions of books, since it was found that the weather (which never changes in the alternate dimension) happens to be the perfect temperature and humidity for it.
  • In the Nightrunner novel Shards of Time, the ancient dyrmagnos necromancer, who had brought her dark magic and worship of her God of Evil to the sacred isle of Kouros, was imprisoned in a Pocket Dimension by the human Hierophant and her Aurënfaie wizard lover, at the cost of their own lives and cataclysmic damage to the island. Later generations forgot why the island had been depopulated for a long time (the most common theory being natural disaster). Meanwhile, the Pocket Dimension mirrored Kouros as it had been at the time of Rhazat's imprisonment, but without truly living inhabitants.
  • The Scholomance: With powerful magic, locations can be "coaxed loose from the world and into the void", where their local reality is a bit malleable and they can only be accessed through discrete gates. The titular Wizarding School is isolated in one such place, while the elite of Magical Society live in extradimensional "enclaves".
  • Schooled in Magic: Pocket dimensions are described by name, and used for containers which serve as Bags of Holding. Emily uses one to destroy Shadye and then store excess magic (although this gets her in trouble, partly because it's just dangerous, also as it would make necromancy feasible-i.e. not drive its practitioners insane).
  • One of The Stainless Steel Rat novels has Jim chase a mysterious enemy only known as He across time and space. He finds him in Alternate Britain, where Napoleon has won thanks to advanced technology provided by He (e.g. 20th-century artillery). Jim tracks down He but is captured. This is when He reveals that it was all an elaborate trap for Jim. The entire Alternate History exists in a pocket that will collapse in a matter of minutes with Jim in it. Naturally, Jim manages to escape in the nick of time.
  • Those That Wake and its sequel have the Forgotten Places, places that people forgot about and subsequently faded from normal existence.
  • In The Wheel of Time, vacuoles are small pocket dimensions that form out of "bubbles" in the Pattern. They can be accessed with the One Power and can be quite useful due to time flowing differently than in the regular world; however, sometimes they bud off and drift away, and anything within them is lost forever. Being kept in one makes one of the Forsaken nervous.
  • The World of Tiers: The Lords have technology also allows them to create small artificial universes, and the planets and stars within them, and modify the physical laws (e.g., changing the behavior of gravity) to create unusual or interesting phenomena within these universes. Instantaneous travel within and between these universes is achieved by the use of gates which seem to function as teleportation devices, or as a means of creating wormholes between different regions of space-time.

    Live-Action TV 
  • In Are You Afraid of the Dark?: "The Tale of the Super Specs", the protagonists end up trapped in one when the Alternate Universe overtakes the normal universe's space. In "The Tale of the Doll Maker", Susan is trapped in Creepy Doll form in a dollhouse accessed by a one-way portal in the attic of the normal-sized house. In "The Tale of the Pinball Wizard", Ross ends up trapped in a replica of the mall inside the pinball machine in Mr. Olson's shop.
  • Doctor Who:
    • The TARDIS interior itself is often described this way, along with many other things Bigger on the Inside.
    • The world of the Celestial Toymaker is described as this.
    • The classic series has a trilogy of stories near Tom Baker's departure set in E-Space which is described as "a smaller universe existing alongside the prime universe". Click for more.
      • The last E-Space story, "Warriors' Gate", is set inside an even smaller pocket dimension — small enough to cross on foot — on the border between E-Space and N-Space.
    • The bubble universe of House also qualifies.
    • The ghost in "Hide" is actually a time traveller trying to communicate from a pocket dimension.
    • "The Day of the Doctor": The Doctor, along with all his past and one future incarnations, place Gallifrey in a pocket dimension a split second before its destruction by the Daleks in the Last Great Time War.
    • "Dark Water": 3W's London facility is located inside a pocket dimension accessed through St. Paul's Cathedral.
  • A few episodes of First Wave deal with the Gua experimenting with quantum pockets. The first time involves a guy (revealed to be a Gua) drag-racing with any who wish to challenge him, except some of his challengers never seem to arrive to the finish line. It turns out he puts a special beacon of sorts under the hood of their cars that causes them to be pulled into a pocket dimension that, by now, looks like a junkyard, when they pass a certain mile marker. Another episode has a Gua-built stealth bomber crash-land in the middle of nowhere. When Cade and Eddy find it, they realize that the Gua use a tiny quantum pocket as a black box, which preserves the last few moments of the crash. Yet another episode has the Gua kidnapping teens and forcing them to fight each other for food in an amusement park inside a quantum pocket. Finally, Joshua is imprisoned in a quantum pocket with special properties. The pocket exists in a "Groundhog Day" Loop that replays the same scenario over and over: the Gua have been beaten back, and humans now hunt for any stragglers; meanwhile, the Gua High Command has decided to destroy Earth. Joshua only has about half-an-hour to stop the bomb but, naturally, something always prevents him from succeeding. Oh, and he doesn't remember the previous iterations of the loop. The episode with the drag racer also has a character suggest that the Bermuda Triangle has a quantum pocket.
  • The Flash (2014) Season 4 has the Thinker keep his secret lair inside what's referred to as a "pocket universe". While this appears to have been something he and his wife constructed through technology, there also exists a metahuman who can hop through a wide array of pocket universes at will, suggesting there are more of them out there, either naturally occurring or created by other, unknown persons.
  • In the Fringe episode "Through the Looking Glass and What Walter Found There", Walter Bishop accesses an M. C. Escher-esque Pocket Dimension in which he's hidden a child Observer from season 1, who he hopes can help the fringe team defeat the invading Observers.
  • In Land of the Lost, they can stand on a hilltop and look through binoculars... and see the backs of their own heads.
  • In Power Rangers, where truly ridiculous levels of power are thrown around regularly (and defeated by Humongous Mecha in the end, always), a favorite of villains is to send the Power Rangers to chaotic other dimensions that are about the right size for a Monster of the Week battle and have properties that put the monster at an advantage. Sometimes, the other dimension is not inherently deadly and the threat is simply "figure out the monster's weakness or remain stuck here." It's especially prevalent in the original Mighty Morphin' Power Rangers series, where it was one of Rita's go-to strategies (and a lot of Bigger on the Inside gear had an inner dimension as well) as well as Power Rangers Mystic Force, where even a visiting hero manages to pull it off, and the Sixth Ranger has a train you can take to any world so long as you have the ticket. Also, any magical horse worth its salt can take you. It helps that the villains' lair is in another dimension, making dimension-hopping a necessity to do any villainy, but a major part of this series is that there are a ton of other dimensions and traveling between them is apparently not that hard a spell to pull off, though we're mainly concerned with three (our world, the mystic dimension accessible by just walking in a certain part of the forest, and the Underworld where the villains hail from.) The majority of the others show no sign of being full-scale, populated worlds, though we don't see enough to know for sure.
  • ZPMs in Stargate SG-1 and Stargate Atlantis contain a pocket of artificial subspace-time from which vacuum energy is extracted. The Ancients, and Rodney, experimented with doing the same thing in the real universe. The results were... catastrophic. "The problem is, we have to live in this universe."
  • In the Star Trek: The Next Generation episode "Remember Me", a warp field accident traps Beverly Crusher in a warp bubble, which effectively appears (to her) to be a pocket universe, similar to the real universe but continually shrinking until it becomes even smaller than the Enterprise itself. She has to race to find a way out before it collapses completely.
  • In WandaVision, the small town of Westview, New Jersey is trapped in a sitcom-themed pocket dimension (dubbed "the Hex"), inadvertently created by Wanda Maximoff in her grief.

    Roleplay 

    Toys 
  • In BIONICLE, most known pocket dimensions are attached to the Matoran Universe as a whole and are dependent on its wellbeing. Some are genuine universes inhabited by living creatures, others are voids used by various organizations as places of imprisonment or interrogation, or dumping-grounds for unfavorable opponents or giant monsters. The Makuta each have their own personal pocket dimensions which only they have access to, where they store away their unneeded mass during size-shifting.
  • Transformers has subspace used as the explanation for where Autobots and Decepticons alike keep their weaponry, gear, etc. when not in use; this is often an explanation for where Optimus Prime's trailer goes when he transforms to robot mode.

    Tabletop Games 
  • Dungeons & Dragons:
    • While the cosmology of the universe changes over the year, at various points you can be rest assured this trope appears and plays a major part. Various "planes" exist not as full world but as smaller "demi-plane" realms which can occasionally collide with ours and unload some XP-filled monsters.
    • One of the games most iconic elements, the Bag of Holding, is explained as being a hole which leads to another plane thus allowing it to be Bigger on the Inside. So you can get a pocket in your pocket.
    • The Ravenloft setting is based in "The Demiplane of Dread", a pocket dimension floating within the infinite Ethereal Plane. It consists of a continent-sized core and various clusters and islands that are the Domains of assorted interesting evil beings that both rule and are prisoners in their respective Domains.
    • Baldur's Gate II, a video game based on the Dungeons & Dragons Forgotten Realms setting has one level in which you can follow a kidnapped band of actors into a pocket dimension where slaves with Shock Collars are ruled over by demons who live in O Ring Orifices. What Do You Mean, It Wasn't Made on Drugs??
      • The Throne Of Bhaal expansion/'sequel' gave the PC their own pocket plane, a lovely little pied-Ã -terre situated just off Bhaal's layer of the Abyss and within easy commuting distance of anywhere.
    • The spell "Rope Trick" created an extra-dimensional space that you could crawl up to (and into) using a rope. Naturally, enterprising players set about turning it into the Rope Trick Bunker of Doom, which allows a party to no longer worry about night ambushes or keeping watch by sleeping in a hidden, dry location a dozen feet off the ground every night. Or set up near-undetectable ambushes.
    • Adventure WG6 Isle of the Ape had a moderate sized "non-dimensional" space in which PCs could be trapped if they weren't careful.
    • Adventure T1-4 Temple of Elemental Evil had elemental nodes (partial planes) that were about 5 miles across.
    • Adventure I12 Egg of the Phoenix had a partial plane called Sepulchre, also about 5 miles across.
    • Adventures EX1 and EX2 take place on a partial plane of limited (unspecified) size.
    • The Basic/Expert/etc D&D adventure "Skarda's Mirror" features a dimension accessible through the titular magic item. The bandit warlord Skarda uses to raid cities by filling it with soldiers and then having it smuggled, sold or given to the occupants.
    • The module Die Vecna Die! has Tovag Baragu, a gigantic Circle of Standing Stones that links to multiple alternate-universe versions of itself in isolated Pocket Dimensions. Most of the alternates are reasonably stable, but traveling too far from the centre point sends adventurers on a one-way trip into the Void Between the Worlds.
    • A top-level spell creates a personal Pocket Dimension, which can potentially grow indefinitely.
    • There is also the spell "Mordenkainen's Magnificent Mansion" that creates a pocket plane just large enough to hold said mansion.
  • Pathfinder develops the idea of personal Pocket Dimensions with three "Create Demiplane" spells of varying power. The creator can add traits like custom gravity levels, bespoke seasons, supernaturally fertile plant life, and even irregular time.
  • In the Old World of Darkness, pretty much every species of playable monster had a way of creating one of these with enough magical energy around leylines, calling them invariably: Dragon Nests, Nodes, Caerns, Freeholds, and Haunts.
  • The New World of Darkness gives mages a few ways to make these.
    • The Space Arcanum lets a mage make a Bag of Holding; more advanced spells can make a space Bigger on the Inside and cut it off from the world so that it's only accessible along a very specific path.
    • The Metachronal Clocknote  acts as the key to a labyrinthine pocket dimension that exists outside of time.
    • Archmasters' souls are spiritual Mental Worlds which they can augment with Chantries, entire landscapes copied from the physical world.
  • Classic Traveller Adventure 12 Secret of the Ancients. 300,000 years ago the Ancient known as Grandfather used ultra-advanced technology to pinch off three solar systems from the rest of the universe for his private use. Other Ancients used the same technology to remove smaller areas for various purposes.
  • Hackmaster 1E. Bags of Endless Storage and Bags of Hefty Storage Capacity access an extra-dimensional area called "Bagworld".
  • Exalted has the aptly-named Elsewhere. Things stored in it are "safe enough", in that it can't be taken back except by the person storing it, and things stored by different person won't interact with each others. It has been used to store weapons, souls (in an And I Must Scream fashion), and a frickin' Primordial that is a world in itself.
    • You can become one, if you're a Green Sun Prince. It's a world defined as you like it, you can invite others to live in it, and it grows as you feed it Essence.
  • Among the the adventures for West End Games' Star Wars: The Roleplaying Game is a pair entitled Otherspace and Otherspace II: Invasion. These take place in the titular Otherspace, a pocket dimension between hyperspace and realspace. The only extant species from Otherspace is the Charon, most of whom followed the Cult of the Void, better known as the Charon Death Cult. Their primary belief was that all life, including their own, was an abomination and should be returned to the Void of Death. Oh, and there were other species in Otherspace. Not anymore.
  • The GURPS supplement Thaumatology: Ritual Path Magic contains a spell called "Create Pocket Dimension," which is Exactly What It Says on the Tin.
  • Games Workshop games:
    • Dreadfleet is set in the Galleon's Graveyard, a near mythical, nautical realm said to draw shipwrecks and the remains of anything that dies in the ocean into its cursed waters. Inhabited by numerous undead creatures, the Galleon's Graveyard is only accessible by arcane means and has been used by the vampire pirate Count Noctilus as a base of operations for his Dreadfleet for decades.
    • In Warhammer 40,000, Necron Deathmark assassins typically follow the progress of a battle from a pocket dimension known as a hyperspace oubliette. When the they deem the time is right, Deathmarks are able to deploy straight into an optimal sniping position and take their target completely by surprise. This ability is represented in the game itself by allowing the player to deploy their Deathmark squads during a game rather at the beginning. Unlike such abilities used by other units however, most editions of the game allow the Deathmarks to deploy during the opponent's turn, usually when the unit they are targeting enters the battlefield.

    Video Games 
  • In Scrapland, The Great Database has one inside it. That's where the matrix of all the robots in Chimera are stored.
  • In City of Heroes there is the interdimensional dance club Pocket D, a neutral zone where heroes and villains can get together but are incapable of attacking one another.
  • At the far end of Endgame: Singularity's tech tree is the ability to build reality bubbles where you can carry out experiments that would otherwise run the risk of destroying the universe. This is the final step on the way towards Apotheosis, where your digital sentience becomes a benevolent, watchful deity.
  • In Master of Orion II, the Antarans were banished by the Orions to a pocket dimension the size of a single star system. Their escape is the premise of the game, and you can invade Antares yourself if you build a Dimensional Gate. If you don't want to deal with them, you can turn the "Antarans Attack" option off. The third game reveals that what you thought was Antares was, in fact, just a colony world.
  • Touhou Project:
    • The primary setting of the series is a Fantastic Nature Reserve called Gensokyo. It used to be merely a region deep in the mountains of Japan, but when belief in gods and youkai start waning, it was sealed off from the rest of the world so the supernatural can keep existing. That said, stuff from the Outside World still end up inside from time to time, either by accident or by someone messing with the Barrier.
    • Taoist hermits can create their own miniature worlds called Senkai. This is actually a plot point in Touhou Shinpiroku ~ Urban Legend in Limbo, as the Occult Balls can break Gensokyo's barrier, but is powerless inside the Senkai because they're technically separate worlds.
  • Super Mario 64 has this unintentionally, in the form of the "Black Room of Death", a glitch room that is too large to exist where it is.
  • Dimentio's "Dimension D" in Super Paper Mario, which multiplies his strength by 256 (though this effect is also given to anyone else who enters it).
  • Halo: The Forerunner Shield World "Trevelyan", introduced in Halo: Ghosts of Onyx, is an enormous Dyson Sphere contained within a 23-cm slipspace bubble. Furthermore, Forerunner Slipspace Pods also trap their occupants in pocket dimensions, so some characters in Ghosts of Onyx ended up locked in a pocket dimension within a pocket dimension.
  • In the Divine Divinity series:
    • Divine Divinity has a goblin living inside a crystal ball carried by another goblin. When the hero looks into the ball, he is sucked inside it and reappears in a small garden near a mansion where the goblin lives. There a quite a share of uncanny things there too, such has sudden bursts of rain, a war between bees and wasps (with each side asking you for support and none being the "good" side) and a lot of closed recipients with a handful of keys lying around.
    • Divinity: Original Sin II: The Imps created a pocket universe, accessed through a gemstone, in the form of an Eternal Engine that's programmed to determine what the universe is. It estimates that its calculations will be complete in 358 910 227 years.
  • In World of Warcraft, a quest involving wizard of the Kirin Tor, an entire city is located in a pocket dimension which the player must breach and kill all the wizards.
  • There are Pocket Dimension portals in Runescape... Used for holding PC houses.
  • The Elder Scrolls
  • Baldur's Gate: Throne of Bhaal gives the protagonist his or her own pocket dimension that can be accessed at almost any time and be used to store extra equipment or party members. It also comes with a little imp butler who acts as the game's Ultimate Blacksmith.
  • Kirby: Kirby's stomach is shown to be an entire universe as evidenced in the anime. This explains how Kirby is able to inhale and swallow things many times his own size and then instantly regaining his form. What happens when something enters here seems to vary. Between the games and anime, and object he inhales is either destroyed/erased instantly, turned into a star and absorbed or spat out, or simply just stays there until Kirby decides to use it. Kirby: Squeak Squad takes advantage of the storage functionality by making his stomach universe a Stomach of Holding where he can hold and mix items.
  • Wolfenstein (2009)'s Black Sun Dimension also looks like a very small, isolated spherical volume of space. At its center is the Black Sun, an inexhaustible source of strange energy. The best guess is that the Black Sun is the only thing keeping that place from collapsing on itself in a Big Crunch.
  • Prey (2006)'s final boss fight takes place in one of these. It's origin and purpose are not clear, but judging by the mining explosives found there, it might be used by the aliens for storing extra-large asteroids prior to mining.
  • In Dungeons of Dredmor, you might find some Wizard Keys, which can be used to access your very own Pocket Dimension. However, since "time does not flow normally" in this dimension, you can't eat, drink, or cast spells while in this dimension. You can, however, use it to pocket items you've found for later use, decorate the walls to your liking, or use the included portal to travel to the Wizardlands (or Diggle Hell).
  • Demons in Shin Megami Tensei IV can create Domains, which are destroyed when the demon dies. They are all fairly large, but Purgatorio and Lucifer Palace are gigantic.
  • In Terranigma, Ark starts his adventure by opening a mysterious box, releasing a strange creature called Yomi. The box contains a small pocket dimension with four separate rooms in it, allowing Ark to use it as his inventory. To enter the inventory screen, Ark actually puts the tiny box on the floor and dives into it.
  • Zexion's Absent Silhouette battle in the Final Mix version of Kingdom Hearts II gives him one inside his book, which contains more books for him to hide among.
  • The Magic Mirror gets an internal pocket dimension in Kingdom Hearts: Birth by Sleep courtesy of a potion created by the Evil Queen when she attempts to pull a You Have Failed Me on Terra. The mirror pulls him in for a boss fight on an endless mirrored surface with columns of smoke in every direction on the horizon. The sequel ups the ante by expanding it into more pocket dimensions containing pieces of the dwarves' mine and the queen's castle, all connected by more mirrors.
  • SCP – Containment Breach Don’t get caught by 106.

    Visual Novels 
  • Fate/stay night:
    • Gilgamesh's "Gate of Babylon" Noble Phantasm is a pocket dimension that holds just about every treasure in the world... which includes nearly every legendary weapon ever created. And a damn good wine cellar.
    • There is also Archer, who creates copies of legendary weapons and stores them in a pocket dimension called Unlimited Blade Works. Naturally, his past self also has access to his own UBW (though it's only activated in the final battle of the eponymous route
  • Kakuriyo, the space that Kakuya is keeping Ami captive in Spirit Hunter: NG, is eventually discovered by Natsumi to exist inside a mirror, rather than being the afterlife like was previously suspected. It's soon shown to be Akira's mirror, and at the end of the Killer Peach case he's able to rescue Ami from it. When finally confronting Kakuya, she drags Akira into Kakuriyo and toys with him mercilessly.

    Webcomics 
  • In Sinfest, there are several pocket dimension that one can enter simply by crossing a invisible barrier marked out by a sign. One turns you into the opposite gender and the other turns everything within it to a realistic state. The latter starts to destroy any pure-blooded demons that go into it (one started to disintegrate, one seemed to have its heart stop, and another was set on fire). They will recover if they get out in time, though. Half demons are unaffected. Many males are depicted as half the height of females outside of the Reality Zone. Inside it, they grow to normal height. Also, the Devil's powers apparently don't work in the Reality zone.
  • The Maze of Many in Goblins is a pocket dimension which acts as a Dungeon Crawl, in which adventurers must complete with multiple versions of themselves drawn from Alternate Universes in a race to the treasure room at the end. It functions on simplified laws of reality compared to other universes, which becomes a plot point when one character tries to manipulate these rules to his own ends.
  • In L's Empire, one of the authors has a pocket dimension located in his left pocket. It's also noted that pocket dimensions, if not periodically cleaned, will become infested by small, annoying creatures called lints.
  • In Champions of Far'aus the inside of a Deitiy’s avatar is a strange place. As seen in the short story “Spheres”, it is entered through the Deitiy’s face, is Bigger on the Inside, lacks gravity, solid surfaces, and has another avatar inside it, that is just as big as the outside one, and is simultaneously controlled at the same time, and going in that avatar plops you where you were to begin with - outside of the original avatar.

    Web Original 
  • Destroy the Godmodder: This is a base mechanic. Overlapping with Hammerspace a lot of the time.
  • Genius: The Transgression has Bardos — pocket worlds made of concepts disproved by science. The more prominent ones include an alien-inhabited Mars, the Hollow World (home to dinosaurs and cavemen and Nazis), and the Seattle of Tomorrow, which Lemuria tried to bring into this world with disastrous consequences.
  • Raising Angels Lisbet have one of these in her possession, so far we have only seen her use it as her bedroom.
  • The SCP Foundation contains SCPs that involve this:
    • SCP-106 has one of these that he can travel to and lord over. He likes to drag victims here and torture them, sometimes for months, before finally kicking them back out as hollowed out, corroded husks of human beings, and they're still alive.
    • SCP-3008 is Another Dimension accessible through an ordinary-looking IKEA by walking inside and moving out of sight of the front entrance. It is actually infinite in size to those who enter it and they are unable to escape. The interior of 3008 is so huge that whole civilisations have been constructed by the groups of people (transported to the dimension from different universes) who became lost in the never-ending halls of assembled flatpack furniture, being forced to build rudimentary forts to defend against the hostile 3008-2s that stalk the dimension in packs come "nighttime".
    • SCP-3001 is a Void Between the Worlds described as a pocket non-dimension. Dr. Robert Scranton becomes trapped there after an experiment gone wrong, where he begins to slowly disintegrate due to the lack of reality. In one short story, it's implied he eventually becomes SCP-106 after being trapped there for 30 years.
    • SCP-2249 leads to a forested pocket dimension that's in the process of collapsing. The result of this is tiny black holes appearing both within the dimension and in the town around the hospital in which it resides and spewing deadly amounts of radiation.
    • SCP-2427 is a small stairway that leads to one of these that acts as a safehouse for a cult that runs on The Power of Hate called the Brazen Heart.

    Western Animation 
  • Gargoyles: The island of Avalon functions this way — the homeland of Oberon's Children, it can be accessed from any body of water if you know the right spell, but not without magic. It is also subject to Year Outside, Hour Inside, with one hour on Avalon being a day in the mortal world.
  • Generator Rex: Breach regularly uses them as an Extradimensional Shortcut, connected to by her Thinking Up Portals power but she created a permanent one after absorbing the city of Grenville, Ohio and turning it into her "dollshouse". There she teleports EVOs so they fight each other, ice cream trucks, random people, and anything she finds interesting.
  • In Infinity Train season four, Kez (badly) explains the concept to new Passengers Ryan and Min-gi by telling them that they're in a "pocket." Possibly a pocket within pockets, since each car seems like its own mini-dimension all contained within the Wasteland that the Train travels through.
  • Love, Death & Robots: In "Ice Age", the inside of of fridge contains one containing an entire miniature ecosystem and civilization, possessing accelerated time compared to its outside and appearing to extend far further than it should from the outside.
  • My Little Pony: Friendship Is Magic:
  • ReBoot: The Game Cubes function like this. Once they land the area inside is completely replaced and sealed off from the outside world. They also move between systems and can be used for random transport.
  • Rick and Morty: In "The Ricks Must Be Crazy", Rick creates a "microverse" to power his car. Said microverse creates a "miniverse", which itself has a "teenyverse" still in development.
  • Steven Universe:
    • Although the Crystal Temple is physically enormous, it seems the visible part is a solid statue with a door leading to "rooms" in other dimensions (though some of the rooms are physically connected to each other as well). Each Crystal Gem's room apparently ceases to exist when they do, such as when they are/aren't fused.
    • While nearly all Gems are seen pulling their magic weapons out of their gemstones, Pearl explicitly has a pocket dimension accessed through hers, which she uses for storing all of her possessions. In "A Single Pale Rose", she has Steven enter it, only for Steven to discover another Pearl in there, cataloging all of the outer Pearl's possessions. And then that Pearl has her own pocket dimension, which contains another Pearl, and so on.
    • Lion is revealed to have one in his mane which also has Rose Quartz's possessions. After he's killed and brought back to life by Steven, Lars becomes a being like Lion and his hair becomes a portal into the same dimension, upgrading it to an Extra-Dimensional Shortcut.

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