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. 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. Not to be confused with a Palm OS game of the same name.
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- 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 Harť+Guu reveals Guu's stomach contains a secluded world with things like six legged cats, crazy buildings, as well as a friendly couple who've been in there a while!
- Negima! has a number of Pocket Dimensions around; Kaede's magic cape contains one, and Mana uses one to store her ammunition.
- 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.
- Blueno's Devil Fruit from One Piece allows him to access one by making a door in the air itself.
- 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.
- 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.
- Erza stores some of her weapons and armors 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.
- In Bleach, The Wandenreich used their powers to create one of these inside the seireitei, this is where they've been hiding for the past 1000 years.
- 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.
- 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.
- The Marvel Comics Heroes Reborn universe was explicitly called a Pocket Dimension, or Pocket Universe, which Franklin Richards literally carried in his pocket.
- 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...).
- There's 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.
- Archie Comics' Sonic the Hedgehog series 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.
- 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 travel back to meet their inspiration Superboy, the Time Trapper diverts them to there. The only inhabitable planet is Earth (and so was Krypton). It has become a dead world after Zod, Faora, and Quex-Ul killed everyone on Earth, following Superboy's death by the Time Trapper. It's apparently destroyed 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. It only made the snarl worse. (The reason they just couldn't say it was an Alternate Universe? Because alternate universes were the reason the reboot happened in the first place).
- 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.
- ''Heroes United' 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.
- Sweetie Belle stores her notebook in a Pocket Dimension in The Sweetie Chronicles: Fragments because it allows her to take it with her as she jumps between Alternate Universes.
- In Split Second, 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 as separate.
- Tartarus. Only mentioned in the story, but the blog expands upon it, saying that an entire mountain range has been folded into the space of a large building.
- Upper Canterlot. There's more real estate than there should be for a city perched upon the top of a mountain.
- The Everfree Exclusion Zone (EEZ), among other naturally occurring areas of highly dangerous terrain that are all bigger on the inside.
- 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.
- Nearly every anthropomorphic personification has been shown to have or use one of these, from the Kaos, to the tooth fairy.
- 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.
- 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. It has one "mode" that's the size of a small cathedral and exists entirely for students to dump illicit objects in - Hogwarts having been around for several centuries, that's a lot of contraband.
- The future human civilization of Walter Jon Williams's 2010 novel Implied Spaces uses pocket dimensions maintained by vast post-human artificial intelligences as living space.
- In Michael Moorcock's Elric of Melnibone stories, 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.
- 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."
- Skeeve's tent in the Bazaar at Deva in the Myth Adventures series.
- The titular protagonist of Johannes Cabal the Necromancer gets briefly trapped in a particularly boring one.
- 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.
- 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 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 AurŽnfaie 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.
Live Action TV
- Doctor Who (classic series) had 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 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 bubble universe of House also qualifies.
- The Ghost in "Hide" is actually a time-traveller trying to communicate from a pocket dimension.
- In The 50th anniversary special the Doctor along with all his past and one future incarnations placed Gallifrey in a pocket dimension a split second before it was destroyed by the Daleks in the Last Great Time War.
- In the Big Finish Doctor Who audio drama "Grand Theft Cosmos", the Black Diamond contains a self-sustainable pocket universe three light years across.
- In Land of the Lost, they can stand on a hilltop and look through binoculars... and see the backs of their own heads.
- 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 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.
- 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.
- 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 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.
- 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.
- While the cosmology of the Dungeons & Dragons 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 was based in "The Demiplane of Dread", a pocket dimesion floating within the infinite Ethereal Plane. It consisted of a continent-sized core and various clusters and islands that were the Domains of assorted interesting evil beings that both ruled and were 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-√ -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.
- 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.
- An Epic-level spell allows you to build your very own Pocket Dimension. It can potentially grow to infinite size.
- 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 and they can augment them 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.
- 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 magical world of Gensokyo was sealed off from the rest of the world when people decided that they didn't want to be bothered with magical creatures anymore. Since then there's the occasional human who wanders in by accident/gets dragged in by Yukari, but they either settle down in the Human Village or get eaten by one of many Youkai.
- 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).
- The "Sharpened Shield" Shield World in Halo: Ghosts of Onyx. 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.
- 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.
- 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.
- In Oblivion, you go inside a painting for the quest "A Brush with Death." Mankar Camoran's Paradise may count, as well.
- 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 in Kirby Squeak Squad and the anime. This explains how Kirby's 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'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'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 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 it's 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 creatures called lints.
- 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.
- 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.
- In 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.
- In Steven Universe Lion is revealed to have one in his mane which also has Rose Quartz's possessions.