[[quoteright:350:[[Franchise/{{Superman}} http://static.tvtropes.org/pmwiki/pub/images/Intangible.jpg]]]]
[[caption-width-right:350:[[AndNowYouMustMarryMe Forced marriage optional]], but for Lois' sake you might wanna hurry.]]

->''"Did you expect me to dodge? How quaint."''
-->-- '''Olka''', mistmeadow witch, ''TabletopGame/MagicTheGathering'' flavor text for [[http://ww2.wizards.com/gatherer/CardDetails.aspx?name=turn%20to%20mist Turn to Mist]]

Cousin to {{invisibility}}, intangibility refers to a state where a (usually visible) entity cannot interact physically with other matter. Everything just phases through the affected object.

Those questions you have about how this could possibly work? [[BellisariosMaxim Don't ask them]].

A truly Intangible Man would slingshot off the Earth at an extreme velocity at the moment of intangibility (the Earth orbits the sun at 18.5 miles per second, and the sun orbits the galactic center at 134 miles per second, and Earth-level gravity only affects objects with mass which intangible objects do not have ''by definition''). If you decide to ignore that, then you'll have to explain how the Intangible Man can stay put on the Earth's surface when the planet's own gravity should be constantly drawing him towards the core. How they can generate enough friction and mass to remain on the Earth and move around, let alone grip things if the writer is feeling charitable, is also likely to be ignored (occasionally these problems are avoided by also giving the character the ability to [[{{Flight}} fly]]). [[RequiredSecondaryPowers Again, don't ask why]].

Asphyxiation is generally not an issue, potential breathing problems are typically ignored outright. If they're stuck in an intangible state for a while, starving to death usually isn't brought up either. Also, don't expect anyone to know that they shouldn't be able to see anything while intangible, if light passes straight through them, it can't form an image on their retinas. You can forget hearing too, air passing though you means nothing registers on the parts of the inner ear that detect sound waves. Run those same reasons in reverse, and it [[IncrediblyLamePun becomes clear]] that a truly Intangible Man would be incredibly ''boring'' as he could neither interact with the world nor even be detected by it. Fortunately, these pesky real life physics rules tend to be ignored in-story thanks to RuleOfCool.

Although the Intangible Man will pass right through walls, chairs, tables and such, he rarely has any problem properly interacting with floors, stairs or any other structures people are meant to walk upon. He may even be able to ride vehicles, with the odds of success rapidly increasing with the size of the vehicle. Anything big enough to walk around inside is quite likely, a ship or spaceship is more or less guaranteed.

Note that once we've seen someone walk through the character to establish the parameters of their intangibility, people will go out of their way not to walk through them too often as this is an expensive special effect, it's usually HandWaved as being an intensely creepy experience to see a living person's insides up close.

For a mentor, intangibility is an opportunity. Being a SpiritAdvisor or VirtualGhost lets them accompany the hero into dangerous places without ever being at [[MentorOccupationalHazard personal risk]].

The ability to render oneself intangible at will occasionally turns up as a superpower. Sometimes the power can work selectively on the user's body (allowing him to voluntarily interact with objects while intangible) or extend further from the user's body (allowing him to make other objects and people intangible) Heroes use this ability to save their teammates from danger. Anti-heroes and villains use it to [[TeleFrag put their hands through people's chests and squeeze their hearts]]. Again, let's ignore the fact that rendering a part of your body intangible would have the same effect as cutting it off. It is frequently a given that while no one else can touch them, two characters separately rendered intangible by the same process will have no problem interacting with each other.

See also ProjectedMan, AstralProjection and SuperSmoke.

----
!Examples:

[[foldercontrol]]

[[folder: Advertising]]
* In [[http://www.youtube.com/watch?v=_UHhBGTsM10 this]] Pepsi commercial, two nerds make themselves intangible and get into all sorts of hijinks. At the very end, they realise they can't even pick up their can of Pepsi anymore.
[[/folder]]

[[folder: {{Anime}} and {{Manga}}]]
* Nancy Makuhari and her son Junior from ''Anime/ReadOrDie'' have this ability. It's explicitly stated that they can't breathe while phasing.
* Kurau from ''Anime/KurauPhantomMemory '' has this power as well - it's one of her more rarely used powers, as it tends to get her noticed more than superstrength or even flight.
* In ''Anime/MagicalGirlLyricalNanohaStrikerS'', Sein has this ability, allowing her to swim through inorganic material as though they were water.
* Hanyuu from ''HigurashiNoNakuKoroNi'' [[spoiler:until ''Matsuribayashi-hen''.]]
* Intangibility is the main ability of [[QuirkyMinibossSquad Noah]] clan member Tyki Mikk from ''DGrayman''. He uses it to [[BodyHorror pull your organs out]].
* In ''Manga/{{Naruto}}'' [[spoiler:Tobi]] is able to become intangible by using the same space/time manipulation he uses to [[VillainTeleportation teleport]]. The primary weaknesses are that he cannot attack while intangible, [[spoiler:he cannot be intangible while teleporting himself or others (and the more he tries to teleport the longer it takes), and he can only stay intangible for five minutes in a row.]] He found a novel way to get over the first one: by attaching a chain to arm manacles he runs toward people, phases through them when his body would touch them, and then turns solid again just in time for the chain to hit the target.
** His ability is eventually explained as instinctually teleporting the portion of his body that intersects with an attack into an alternate dimension. [[spoiler:Kakashi and Naruto exploit this by attacking him in both dimensions at the same time]].
* Ryoko of ''TenchiMuyo'' has been shown to walk through barriers and walls unless they are specifically shielded to prevent her from doing this.
** Sasami even comments on this at one point in an episode with a [[CuteGhostGirl little ghost girl]], who asks if her phasing-through things disturbs Sasami at all.
* A manga series called ''Manga/TokyoESP'' by Hajime Segawa ([[HeAlsoDid who created]] ''Ga-Rei'') features a protagonist, Rinka, who gains this power after a freaky incident involving otherworldly fish and arctic mammals.
* Perrier La Mer of ''Amuri in Star Ocean'' has this power (called Infiltration in the show) but cannot fully control it, so she's always passing through other people and solid objects. Her parents took advantage of this by making her the victim of dangerous stage performances like knife-throwing acts and passing giant buzz-saws through her body. None of it caused any physical harm, but she was still deeply traumatized.
* Alucard from ''Manga/{{Hellsing}}'' has this as one of his [[SuperpowerLottery many, many powers]].
* Some users of Logia Devil Fruit in ''Manga/OnePiece'' can do this by transforming into their particular power's element ([[PlayingWithFire Ace]], [[ShockAndAwe God Enel]], [[LightEmUp Admiral Kizaru]]), becoming immune to most attack. The only way around this is to attack them with an element-specific weakness, or be able to use a form of Haki called the "Color of Armaments", which allows its user to bypass Devil Fruit based defenses.
** This is also a part of Perona's Devil Fruit power. The Hollow-Hollow Fruit makes Perona a "Ghost Woman", allowing her to generate and control ghosts that drain positive emotions from people. She can perform AstralProjection, leaving her physical body behind while enabling her own spirit to move freely. She can't make herself tangible without returning to her body, so while she scares Usopp with the threat of 'heart squeezing' mentioned elsewhere on this page, she can't actually do it.
* EvilWeapon Anubis from Manga/JojosBizarreAdventure is an Egyptian sword who's blade can pass through objects to cut an object behind it, as demonstrated soon after its first appearance, when it slices a cow and a man behind it, but only cuts the man.
** The Pillar Men from part 2
[[/folder]]

[[folder:Comic Books]]
* ''Comicbook/{{X-Men}}'': This is Shadowcat's mutant ability. Her ability to not fall through the floor, while not explained well, has nothing to do with the actual, physical floor (which she can pass through if she chooses) and, as such, can be used ''without'' a floor. She often walks on air by visualizing an invisible staircase. Later works have treated it as slow flight. This tends not to show up in adaptations.
** Referenced in ''WesternAnimation/XMenEvolution'' when a mutant with YourWorstNightmare power is brought into the mansion and Shadowcat keeps on seeing herself falling into the Earth's Core.
*** Creator/JossWhedon created a similar situation in ''Astonishing X-Men'', where Cassandra Nova mindscrewed with Shadowcat and caused her to phase deep into the Earth.
*** Whedon also had Kitty accidentally lose control enough to phase through the floor when she and Peter Rasputin first did the deed, in an amusing display of PowerPerversionPotential.
* Also from X-Men, the villain Shinobi Shaw has the same power. Being a villain, he uses the 'heart squeezing' as his trademark killing move. He also openly admits it can be used for peeping on girls (not that he needs it with his cash)
* Negative Man from the ''Comicbook/DoomPatrol'' can leave his body as an energy-form that can control its tangibility.
* In TheDCU, all natives of the planet Bgztl have voluntary intangibility powers. This is the home planet of Phantom Girl, from the ComicBook/{{Legion Of Super-Heroes}}.
** Well, in the Threeboot version it's explained as Bgztl being a planet in another dimension which exists in the same space as Earth and her shifting her mass between our dimension and that one as a unique power. She's visible in both worlds (which gets awkward in the one she's not paying attention to) and is solid and can sense in only one at a time. This solves the floor problem (and causes a new one when someone has to go to the core of a planet) when you realize that she can't avoid the planet by shifting to a dimension with an identical planet in the same place.
* IronMan enemy and Thunderbolts member The Ghost is an industrial terrorist who uses his own technology to become intangible, invisible, and fly at will.
** He once tricked fellow IronMan foe Spymaster into accepting one of his intangibility devices, only to take it from him halfway through a wall, killing Spymaster instantly.
* In Dark Horse Comics' ''Ghost'', the titular character could make herself intangible (and fly, thus avoiding the floor problem). She had a particularly nasty attack where she would reach into an opponent's chest while intangible, grab his heart, and then become corporeal again. (Why [[RequiredSecondaryPowers her hand wasn't hurt in the process]] is not explained.)
* The MartianManhunter has this power, also having flight powers so he doesn't have to worry about falling through the floor.
* Marvel Comics' Comicbook/DoctorStrange can [[AstralProjection split into an 'ectoplasmic' self]] and his physical body. The former is intangible, and even could go right through the core of the planet Earth as a shortcut around the surface.
* Marvel Comics' TheVision was a flying android who could shift his molecular density, from intangible to denser-than-diamond. He made frequent use of this power to reach into other beings and dodge attacks.
** This includes phasing while someone is kicking at him... like Franchise/{{Batman}}.
* TheFlash can do this for about a few seconds, by "rapidly vibrating his molecules". He hasn't done this trick much since CrisisOnInfiniteEarths, though.
* Moonstone in ''{{Thunderbolts}}'' (later the Dark Avengers version of Ms. Marvel) can turn intangible. She has outright flight to deal with the falling-through-the-ground aspect.
* ''Hero Hotline'' featured Fred, the invisible, intangible man. The problem being that he can't interact with his surroundings at all. It's speculated that Fred isn't real and is just a ploy by super-ventriloquist Voice-Over to pick up two paychecks, but V/O talks to Fred when nobody else is around, so maybe not.
* The ''Comicbook/{{Daredevil}}'' villain Death-Stalker was trapped in a dimension partially connected to Earth's dimension, and while naturally invisible and immaterial, could become visible and intangible, invisible and tangible, or visible and tangible for a few hours at a time. He also wore gloves that used microwaves to give him a "death grip". He died when he shifted to full tangibility to grasp Daredevil with the gloves, but was halfway through a tombstone; the trauma and shock killed him instantly.
* Blue Fire, from ''Wham Comics'', can become intangible and is [[WreathedInFlames covered in blue flames]]. It was explained that his intangibility was related to force he or another used, the gentler he touched something it could be solid, but a punch would pass through.
* The villain Hood, from ''Amazing Man Comics'', has the powers of intangibility and teleportation. The Amazing Man himself could become intangible when he turned into the Green Mist.
* The Duke of Darkness, from ''Triple Threat Comics'', uses this power to battle villains such as Mr. Slumber.
* Sergeant Spook, from ''Blue Bolt'', has this power as well as invisibility.
* ''GuardiansOfTheGalaxy'' has minor villain Brahl, who can turn intangible at will to keep from being hurt. Subverted when he's decked anyway by a hero who's ''also'' intangible.
* This is the power of the ''ComicBook/FantasticFour'' villain Red Ghost.
* {{New 52}} introduces a new {{Superman}} villain named Anguish, a woman with this power. Anguish explains that her power comes from altering her body's density, meaning she can also increase it to the point that she's strong and fast enough to kick Superman around. She complains that her power [[PowerIncontinence activates automatically]], which is useful against sneak-attacks, but not so great when [[CantHaveSexEver she actually wants someone to touch her]]. Superman only manages to hit her once, by breaking the ground that she's standing on. In the end, Superman resorts to fixing and returning her beloved mother's locket, at which point she leaves.
* The ComicBook/SilverSurfer can do this due to his manipulation of molecules but doesn't do it often. His [[Film/FantasticFour movie counterpart]] did this quite a bit, particularly in his introductory scene where he phases through buildings, cars, the Human Torch, and even his own board.
* ''Comicbook/{{Watchmen}}'' has Dr. Manhattan, a being who can control his own molecules as well as those around him. He typically phases through walls [[ThereWasADoor without bothering to open doors.]]
* Sublime of ''[[{{Gen 13}} DV8]]'' has control over her density -- she can walk through walls or be tougher than diamonds. She mostly goes for the latter choice, being a very talented and skilled hand-to-hand fighter and all.
[[/folder]]

[[folder: Fan Fiction]]
* The popular {{Glee}} fanfic All The Other Ghosts has main character Kurt (aka The Ghost) who has this power along with invisibility. He can control his intangibility, so that he is simultaneously intangible to one object while being tangible to another, as well as control his tangibility level without becoming completely solid, which is a solution to a lot of the logistical problems. In fact, when a random girl spontaneously gets his powers temporarily, she has no control over them and immediately begins sinking into the floor, forcing The Ghost to use his powers to fish her out of it. He can also make someone else intangible while touching them, something he uses often when handcuffing criminals and putting their handcuffs into the wall so they can't escape. He can also jump out of helicopters, fall right through the ground, use the ground to slow down, and then climb his way out of the cement. Really, he makes good use of his skill. And when he uses his intangibility and his invisibility at the same time? Creepy as hell. His name suits it.

* Shows up in MyLittlePonyFriendshipIsMagic fanfics sometimes:
** In Fanfic/WhipAndWing, a supporting character, a unicorn named Silver Trowel, has an enchanted necklace that allows the wearer to pass through walls and avoid injury. It helps save himself and IndianaJones from a few tight spots. [[spoiler: Much more problematic when Trowel pulls a FaceHeelTurn, and Indiana can't catch him. Indy finally kills him by grabbing the necklace, pushing Trowel into a wall, and removing it. This forces Trowel to materialize with his upper body inside the stone, and he suffocates to death]].
** Now-teenage Pumpkin Cake can cast intangibility spells in [[http://www.fimfiction.net/story/129154/brother-against-sister Brother Against Sister]], as she did in the episode "Baby Cakes." She mostly uses it for shielding against attacks, or when she and Pound Cake want to get into restricted areas. Later, she finds more uses for the spell, including as a weapon and even a painkiller on one occasion.

[[/folder]]

[[folder:Film]]
* The monster in ''4DMan'' was a scientist who acquired this ability. Using this power consumed his [[LifeEnergy life force]] at an accelerated rate and he had to replenish it by phasing through other living human beings.
* The movie ''Film/{{Ghost}}'' goes out of its way to show how much effort it takes newly dead PatrickSwayze to move a penny, but he never has the floor problem, nor does he have a problem riding in elevators.
** This and ''Film/GhostDad'' can mostly handwave the floor problem away because they are actually ghosts, and presumably susceptible to different physics/laws. Or whatever...
* The Creator/BillCosby movie ''Film/GhostDad'' has Bill as a ghost who can only interact with the real world if he "concentrates". This results in a scene where his concentration lasts enough for him to pour himself a drink, but when he tries drinking it it goes right though.
* The Twins in ''Film/TheMatrixReloaded'' can turn this on and off at will, and use it selectively in fights to dodge attacks. It has the added bonus of healing wounds - several gunshots to the arm can be undone simply by turning intangible and then reverting. [[spoiler: Morpheus blowing up their car with them inside it had more of an effect, although whether they survived is left ambiguous.]]
* In ''Film/{{Labyrinth}}'', Jareth phases through Sarah during "Within You".
* In the ''Film/XMen'' films, Kitty Pryde's mutation allows her to do this.
[[/folder]]

[[folder:Literature]]
* In ''{{Literature/Alterien}}'', Oberon discovers he can phase through matter by touching it. Alteriens do not become intangible. They vibrate the molecules of whatever object they come in physical contact with. In the case of a wall, the wall's molecules would vibrate to the point of becoming intangible. The effect is temporary, ending as soon as they pass through. This ability does not work on iron.
* All spirits and the Aash Ra of ''Literature/AstralDawn'' can naturally move through 3-dimensional matter. They can remain geosynchronous with a planet while in an intagible state. This is possible through their higher dimensional states, which are not subject to 3-dimensional physics. For them, walking through walls, other objects and people is as simple as a 3D person or animal walking over a 2-dimensional surface.
* In the ''Literature/NightWatch'' universe, descending through enough layers of Twilight will turn the Other intangible. The "falling through the floor" problem, however, is not ignored at all - in fact, the very trick is used to climb a tower through the floors in the third book.
* In the ''Literature/WildCards'' universe, Modular Man turns intangible by shifting his mass partly out of this dimension. He also defies gravity by the same method. Both powers are lost when [[spoiler:his inventor turns Joker]] and Mod Man can no longer be repaired.
** The Astronomer also had this as one of his powers. It backfired when he tried to use another one of his powers, a mental shield, to protect from another character's literal DeathGlare... and since he could only use one power at a time, and was halfway through a wall...
** Wraith is another character with intangibility who decides to make a living as a ClassyCatBurglar. However, as she's got maybe a ten pound limit to objects she can carry while phased, she performs her heists in a mask and bikini and focuses on paper goods (such as high-currency bills, bonds, etc.).
** Mackie Messer, aka "Mack the Knife," could vibrate himself at such frequencies as to walk through walls. He didn't seem to have problems with floors.
* In Chris Wooding's novel ''Literature/StormThief'', there are creatures called revenants, that are totally intangible, and if they touch you you die. They are also invisible, and there are basically only three ways to kill them. The first is to use a specialized weapon called an Aether Cannon, the second is to have a unique golem touch them, and absorb them into himself, and the third involves total destruction of the Chaos Engine, an ancient artifact, and a massive one at that that is next to impossible to destroy.
* This condition was inflicted on an unwitting thief by a cursed amulet in a short story from ''Tales of {{Ravenloft}}''. Floors weren't a problem, but eventually the poor guy became ''so'' intangible that he completely faded out of the world.
* In ''Literature/TheSkinjackerTrilogy'' by Neal Shusterman, the Afterlights (ghosts) are like this. They can only stand on ground that has "moved on". The requirement to move on is being loved and cherished by many people. If they stand on 'living' ground too long, they will sink into the center of the earth.
* There's a German SF short story out there in which a scientist invents a machine that can turn people intangible for a time and gets blackmailed by a thief who wants to help himself to that power. The thief hasn't thought things through, though, and so when the scientist does grant his wish, he promptly falls through the ground (and presumably his death once the effect wears off again), a fate the scientist only averted during an earlier self-test by keeping his own ''feet'' unchanged and solid. In the end he decides that his device is actually rather useless, save ''possibly'' as a novel method of execution.
* In ''Literature/LevenThumps'', this is one of the twelve gifts you can receive when you arrive in Foo.
* [[GrimReaper Death]] from ''Literature/{{Discworld}}'' is more than capable of walking through walls. Rather than becoming intangible, he's simply so ''real'' that the rest of the universe may as well be made of cobwebs.
** His granddaughter Susan can do this as well, describing it as walking in the moments when the obstacles don't exist. She doesn't like using it, since she [[IJustWantToBeNormal wants to have a normal existence]], but it's rather useful, and off putting when she can't use it.
* In ''[[Literature/TheGrimnoirChronicles Hard Magic]]'', Fades are [[DifferentlyPoweredIndividual Magicals]] with the power of intangibility.
* Dutilleul in Marcel Aymé's ''Le Passe-Muraille'', though this seems limited to walls apparently.
* Klaus from ''TheMilkweedTriptych''.
* ''Literature/TheSagaOfTheNobleDead'' has the undead wraith Sau'ilahk. He is a powerful sorcerer and can turn solid for brief periods to move physical objects, but is most dangerous in his intangible state: any living thing that passes through him is rapidly drained of life.
* One of the characters in OrsonScottCard's ''Literature/{{Pathfinder}}'' novel can do this. Although [[spoiler:it's not really phasing, it is actually a limited form of TimeTravel. The character continuously jumps forward in time by seconds/microseconds. And it is painful, and potentially even deadly to actually phase through people/objects.]]
* In the short story "What Doctor Gottlieb Saw" by Ian Tregillis a StupidJetpackHitler experiment gone wrong causes the subject to fall into the centre of the Earth. His successor in ''Literature/BitterSeeds'' has learned to focus his powers to prevent this happening, but he can still only remain intangible as long as his breath of air lasts.
* The spirit haunting a space station in ''Literature/GalaxyOfFear: Ghost of the Jedi'' glides about and passes right through walls and any other solid object, though he ''can'' affect Tash. [[spoiler: He feels helpless and like a failure, but makes a decent SpiritAdvisor to her.]]
* In Creator/DennisWheatley's classic horror story ''Literature/TheKaOfGiffordHilary'', title character Sir Gifford is reduced to total intangibility by a different mechanism where normal physical rules do not apply: the occult. Presumed dead, he is still very much alive and conscious - but his [[AstralProjection soul]] has been separated from his body, so he is doomed to walk the world as a living ghost, able to see and hear but not to make contact, except with animals and psychics.
* In ''Literature/TheZombieKnight'', [[TheGrimReaper reapers]] get the true, sucky version of intangibility. They can see, fly and keep pace with the Earth, but they can't touch anything or even talk to living people unless they [[BondCreatures take a human servant]].
[[/folder]]

[[folder:Live Action TV]]
* ''Series/StarTrekTheNextGeneration'': In "The Next Phase", Geordi and Ro Laren were thus afflicted by an experimental Romulan cloaking device which also served as a "phasing device". It made them invisible and intangible, making them think they were dead ghosts. Later it is revealed that the UFP also experimented with such a cloak. It can render the ship intangible. [[spoiler: but a treaty forbade it and the system was GoneHorriblyWrong.]] It is heavily implied that [[spoiler: transphase torpedoes]] work this way to get past defenses.
* The Doctor (not [[DoctorWho that one]]) from ''Series/StarTrekVoyager'' can have such effect as he is actually a ProjectedMan. His predecessors were Professor James Moriarty - a holonovel character who accidentally gained sentience - and the Vegas casino emcee Vic Fontaine, who was created to be so interactive that he surely ''seemed'' fully sentient, and was aware of his nature. (Of course, in Star Trek, it seems ''any'' hologram will become sentient if left on wrong enough, given a misworded command, etc. to the point that you gotta wonder why they're still using the things; ethical considerations and the fact that ''freaking Moriarty will take over your ship'' makes the fact that holodecks are still a thing ''most illogical,'' as a certain oldschool science officer would put it.)
* ''Series/StargateSG1'':
** They did this at least three times: A race of highly advanced humans had developed this technology; Daniel was once thus afflicted by a mysterious alien crystal skull; and Carter and Mitchell were placed in an intangible state by a security device belonging to Merlin (secretly [[BeethovenWasAnAlienSpy an advanced alien]]).
*** The Carter/Mitchell version led to an amusing moment when, after another character walks through both of them, they start poking each other to determine that they are, in fact, tangible to each other.
** They also [[LampshadeHanging hung a lampshade]] on it, when an actress in the ShowWithinAShow about the Stargate asked why they didn't fall through the floor, and no one had an answer.
** There was an episode where Carter, trapped in an Asgard research facility, used the [[ProjectedMan holographic comm system]] to help O'Neill and Teal'c rescue Thor from a Ha'Tak in orbit. Since the Asgard lack HardLight technology she was able to distract guards and scout ahead, but proved less useful when they needed someone to rewire doors.
* ''Series/{{Angel}}'':
** Afflicted Spike after he was brought BackFromTheDead. He, however, was a ghost or some other sort of psychic projection, and didn't have to worry about falling through the floor because he was essentially imagining himself wherever he liked.
** Sahjhan from Season 3. For most of his appearances, anyway.
** The Fang Gang are fighting a MonsterOfTheWeek with this skill. Fortunately he has to make himself tangible to inflict damage on ''them'', so when they do they cut his head off.
* ''Series/BuffyTheVampireSlayer'':
** "Halloween" -- Willow the Friendly Ghost, with the same lack of floor issues. This may be because the tv/movie ghosts that form the popular conception usually don't have such issues. Since that was what she was thinking of when picking her costume and the costumes turned you into what you intended them to be, she didn't have those issues either.
** The First Evil, whatever it manifests as. It's a plot point in the middle of the last season that Giles may be the First because he doesn't actually manipulate anything. It eventually lets slip that its real motivation is to assemble a flesh-and-blood body of its own.
* One episode of ''Series/TheXFiles'' had an escaped convict who had this as a power, as well as the ability to reduce anything he passed through to ash. It's demonstrated with some {{Technobabble}} that it's electricity-based and doesn't work against insulating materials, and he's eventually done in when he tries to phase through a speeding car and gets fatally smacked by the windshield.
* D. L. Hawkins, from ''Series/{{Heroes}}'', has this as his special power. He can use it selectively, allowing him to touch one object while phasing through another, thus providing a handy rationale for the "floor problem". He can also use it in a lethal fashion, such as [[spoiler: when he ''literally'' rips Linderman's brains out]].
* In the short-lived B SciFi show ''Series/{{Cleopatra 2525}}'', the 'falling through the floor' problem was averted; the BigBad revealed it had taken years of research to solve. On the other hand, [[spoiler:Hel's father]] is somehow able to do it without the device and also doesn't have the floor problem.
* Rimmer the [[VirtualGhost hologram]] on ''Series/RedDwarf'', until he gets a HardLight upgrade in season 6.
* Harlan Band of ''Series/SpaceCases'' had this problem in one episode.
* Subverted in a first season episode of ''Series/TheMightyBoosh''. After Howard is killed (temporarily) he returns to visit Vince as a ghost. Vince is impressed and moves his hand to bash into Howard's chest:
--> '''Howard:''' What are you doing?
--> '''Vince:''' I thought like, I would pass right through you
--> '''Howard:''' No, I told you, [[BreakingTheFourthWall we spent all the budget for effects on your hair.]]
--> '''Vince:''' ''(turning to look at camera)'' It ''is'' looking good.
* {{Lampshaded}} in ''Series/BloodTies'', where a ghost complains to the main character (and only person that can see him) that how come he can't touch stuff, but he can still sit on a couch.
* ''Series/MutantX'' had Jesse. Unlike most examples of this trope, he could also reverse the process to the point where he was MadeOfDiamond. He later learns how to make other objects (or parts of them intangible. This becomes incredibly useful to getting his teammates into locked areas.
* This was Jack's unmorphed ability in ''Series/PowerRangersSPD''.
* Many gods in ''Series/HerculesTheLegendaryJourneys'' and ''XenaWarriorPrincess'' will be some combination of invisible [[spoiler:to almost everyone]] and intangible when they appear.
* The mentally-projected hologram of Al on ''Series/QuantumLeap'' appeared to have this power, but he wasn't really "there." He was able to give the impression of intangibility to a man who was able to see him in the episode ''[[YetAnotherChristmasCarol A Little Miracle]]''.
* A natural ability of Dessarians in ''Series/{{Tracker}}'' was the ability to phase and walk through solid objects.
* The ''Series/{{Eureka}}'' episode Phased and Confused had this as the intersection of its A and B plots. The mysteriously solid floors became very noticeable when a phased character noisily runs down a short staircase, immediately after not being able to touch things was an obstacle.
* Happens in an episode of ''Series/TheFlash1990'', where a drug dealer forces Barry to inhale a new designer drug. Unlike a normal person, Barry's molecules start vibrating extremely fast, and he ends up walking through a brick wall (but not falling through the floor).
[[/folder]]

[[folder: Music]]
* {{Marillion}} ''The Invisible Man''. Despite the title, the lyric describes an ''intangible'' man.
--> I will walk stride for stride with you
--> I will try to help
--> When you stumble
--> You will stumble through me.
* The Music/TheMoodyBlues' EpicRocking anthem ''Legend Of A Mind'' is about another way of becoming intangible: dedicated to sixties' drugs guru Dr Timothy Leary, a theme of the song is AstralProjection brought about by (un)wise ingestion of [[DrugsAreBadForYou psychotropic pharmaceuticals]]
[[/folder]]


[[folder: Multiple Media]]
* From the ''Franchise/{{Bionicle}}'' universe:
** Tuyet, a Toa of Water, wore a [[MaskPower Mask of Intangibility]].
** One of the powers potentially available for a Rahkshi (their creators, the Makuta have it by default) is Density Control. This can be used not only for phasing through walls and attacks, but for [[NotQuiteFlight floating into the air]] and then [[ColonyDrop dropping with the force of a meteor]]. Makuta Krika frequently made use of this power after a mutation caused him to lose most of his other abilities. [[spoiler: It also lead to his death. When forced out of control, his power turned him so intangible that he simply ceased to exist.]]
** Wearers of the Kakama Nuva, the enhanced version of the [[MaskPower Mask of Speed]], can pass through objects and people by vibrating their own molecules very fast.
[[/folder]]

[[folder:Other Sites]]
* ''Wiki/SCPFoundation'', [[http://www.scp-wiki.net/scp-2332 SCP-2332 ("Thought Messenger")]]. Because SCP-2332 is made of light, it can pass through solid objects as long as they're made of a substance permeable to light (i.e. not opaque) such as glass and Plexiglas.
[[/folder]]

[[folder:Pinball]]
* Subverted in ''Pinball/AmericasMostHaunted;'' an animated clip shows a ghost getting punched in the fact, causing its teeth to fall out.
[[/folder]]

[[folder:Tabletop Games]]
* In {{Mortasheen}}, the [[http://www.bogleech.com/mortasheen/xenogog.htm Xenogog]] has this power, though it can solidify the tips of its needlelike arms to perform "''a surgically perfect lobotomy with a single touch''"
* In the collectible card game ''MagicTheGathering'', there are entire races of intangible people (the Dauthi, Soltari, and Thalakos). Their homeplane got caught between Dominaria and Rath and ripped to shreds, leaving the inhabitants as Intangible Men who can pop in and out of reality at will.
* Necron Wraiths do this at will in TabletopGame/{{Warhammer 40000}}. The same technology may play a role in the effectiveness of Necron melee weapons against power armor.
** As do the C'tan, the masters of the Necrons.
* ''In TabletopGame/{{Deadlands}}: Reloaded'', Harrowed get intangibility as an Edge; a power they can turn on and off at will.
** This has its roots in the Classic system, where Ghost (becoming intangible at will) was one of the possible Harrowed powers.
* ''TabletopGame/DungeonsAndDragons'' has the "incorporeal" subtype, which cleared up a LOT of confusion about intangible beings such as ghosts or 2E ''Wraithform'' spellcasters when 3E introduced it to the game.
** 4th Edition splits this in two, with the Insubstantial resistance ability (half damage from all attacks) and Phasing movement ability (the ability to move through solid objects and difficult terrain without penalty, though you still have to occupy an open square when your movement is finished). Some creatures can be Insubstantial without having Phasing and vice versa, though most creatures with one also have the other.
* The "Insubstantial" advantage in ''{{GURPS}}''
* Also the Desolidification power in the ''HeroSystem''. Which works a bit asymmetrically -- characters with it can't affect the physical world at all while it's in use unless they buy their relevant powers (such as strength) with a rather expensive advantage, but need to define some reasonably common way(s) in which the physical world can still affect ''them''. They also can walk on solid ground with no problems, but don't automatically get to fly unless they buy that power separately, and may in fact fall through the floor if they don't stop themselves at the price of taking the usual damage from the 'impact'.
* The fourth level of the Insubstantial power in 2E ''MutantsAndMasterminds'' grants this power and handwaves the breathing and being able to stand on the floor, although you still face a breathing problem when within solid objects. It's also required that some reasonably common material or effect counters your insubstantiality for game balance purposes.
[[/folder]]

[[folder:Video Games]]
* Akuma's float-on-one-knee trick from ''Videogame/StreetFighter'' also turns him intangible so he can zoom around untouchable. If you ever see him doing this trick while tangible though, hit him or get out of the way because you're a second away from the [[DangerousForbiddenTechnique Raging Demon]] attack.
* Bow's "Out of Sight" ability in ''VideoGame/PaperMario'' turns the player intangible and invisible, but you can't move while using it.
** Boos can turn intangible in ''VideoGame/SuperMario64''. Mario can do this himself with the Vanish Cap. (Should have been called ''Intangible Cap.'')
* ''Videogame/{{Touhou}}''
** Suika Ibuki has the ability to manipulate her own density at will. [[SNKBoss An ability she puts to good use as the boss of the franchise's first fighting game]]. [[InterfaceScrew During which, you cannot see either of your life bars]]. Yep.
** Reimu Hakurei has the ability to float, [[WhatKindOfLamePowerIsHeartAnyway which seems rather redundant since everyone in Gensokyo can fly]]. However, it turns out that this ability includes the ability to [[HeartIsAnAwesomePower float away from reality itself]], where she becomes completely impossible to touch, making her nothing short of invincible. [[WordOfGod If it wasn't just for play (with time limit)]], [[CurbStompBattle no one could beat her with any method]].
* ''VideoGame/FinalFantasyVI'' famously has Intangirs, a kind of untouchable bonus mook, in addition to regular intangibility spells.
* The DS-exclusive Violet Wisp from ''VideoGame/SonicColors'' turns Sonic into an intangible ''hedgehog'', able to pass through walls.
* ''{{Lusternia}}'' has Zenos, a particularly creepy example: basically, he's an [[OmnicidalManiac omnivorous]] sentient fog. Tales abound of him enveloping whole forests and cities, devouring the inhabitants and leaving only charred wasteland in his wake.
* In ''VideoGame/DragonAgeII'', Fenris has the ability to become partly intangible as a result of having his body forcibly laced with [[AppliedPhlebotinum lyrium]]. Exactly ''how'' intangible he can become is unclear; in gameplay terms, his "Lyrium Ghost" mode makes him more resistant (but not immune) to damage, and aside from that he mostly uses the ability to crush people's hearts in their chests.
* ''VideoGame/TalesOfMonkeyIsland'': [[spoiler:Subverted at first in Chapter 5, when Guybrush can still touch and pick up the items as a GhostPirate in the Crossroads of the afterlife; but when he returns to the living world, it becomes Double Subverted when he tries touching the Cursed Cutlass of Kaflu, only to find that he can't touch it (or any other item) or even pick it up while in the living world (he needs to get back in his own body in order to do that).]]
* ''[[Videogame/DevilMayCry Devil May Cry 3]]'' has The Fallen, angels with the faces of demons who fly through walls, floors and ceilings as easily as they do empty air.
* ''Videogame/ManaKhemiaAlchemistsOfAlRevis'' has Pamela Ibis, a friendly ghost who makes regular use of this in cutscenes. In gameplay, this is also the source of her [[ExactlyWhatItSaysOnTheTin Physical Immunity]] skill and her [[NoSell Bear Shift]] defensive support.
* A very hard to get upgrade of Cloaking in ''VideoGame/SwordOfTheStars'', for thirty seconds ships with the module cannot be hit or fire on enemies, but they are visible.
* The "IDSPISPOPD" cheat code allows the player to walk through walls in ''VideoGame/{{Doom}}''. Usually, it's handy for getting through the level quicker, but on one occasion in Doom II, there is a [[EasterEgg special area]] that can only be accessed with the cheat code.

[[/folder]]

[[folder:Web Comics]]
* Ulkurz from ''{{Earthsong}}''
* Geist from the webcomic ''{{Heist}}'' is a rare case of simultaneous Intangibility and {{Invisibility}}. While he doesn't have to worry about falling through floors, there is a two-minute time limit and he can't phase individual body parts.
* One of the standard abilities for Siracs (psionic raccoons) in ''TheCyantianChronicles''.
* Kira of ''Webcomic/BreakpointCity'' has this [[http://www.breakpointcity.com/archives/2006/03/22/phase-one/ ability]].
* Along with {{Invisibility}}, this is one of the main abilities of a fully-realized Void hero in ''{{Homestuck}}''. Roxy, the only Void hero known to earn these powers, can currently only use them with the help of the Black Queen's [[RingOfPower ring]], but it's implied that any God Tier Void hero can use them at will.
[[/folder]]

[[folder:Web Original]]
* In the The Legion of Nothing Ghost has this power along with Flight and invisiblity.
* In the ''Literature/WhateleyUniverse'' Phase (Ayla Goodkind) has the ability to become a number of variants of intangible, most notably fully intangible, nearly-intangible, or super-dense, so he's NighInvulnerable. This is supposed to be an extra-dimensional density-changing ability (though according to the school testing wonks, it's not, but the ensuing scientific babble is hard to understand). While intangible (or close to it), he can fly, and at his most dense, he is almost impervious to damage. But when he first manifested as a mutant and got his powers, he couldn't control them and had trouble NOT sinking through the floor, or going super-dense and smashing his bathroom to shards. Or, for that matter, not going intangible and leaving parts of his clothing behind.
** He also has a fun/hilarious [[RequiredSecondaryPowers Required Secondary Power]]: if he becomes solid while phased through something, ''the other object disappears.'' Forever. This results in lasting ClothingDamage (and, y'know, other damage) if he phases in and out quickly, but turns a scary situation into lots of awesome when he has an I-beam stuck through his chest as part of his Test To Destruction experimentation by his family's anti-mutant science labs.
** Phase's power is also quite rare. Only one other mutant has the same powerset: Tinsnip, one of the deadliest assassins in the world.
* ''Literature/FineStructure'' has Mitchell Calrus, "The Four-Dimensional Man", who is able to turn intangible at will.
** Mitch is notably not able to breathe while phased and makes use of scuba equipment.
* The Wraith is a mercenary thief from the ''GlobalGuardiansPBEMUniverse''. He specializes in getting into places that others cannot get into by way of this power.
** Phantom Panther is a Chinese martial artist who can not only turn intangible but can become invisible as well.
** Breeze, as part of her [[ElementalPowers control over wind and air]] can transform into a humanoid cloud of mist.
** Several of the [[SuperSpeed speedsters]] in the setting can vibrate through solid material.
* [[Roleplay/{{AGENTS}} A-GENT]] 66 can become Intangible at will and pass through various materials. Except lead, for a yet unexplained reason.
* In ''Literature/{{Worm}}'', Shadow Stalker's shadow form can pass through ordinary obstacles.
** The mercenary villain Watch has, among other powers, the ability to make his hands intangible -- and partially unphase them inside people to do damage.
* A dark power in ''Literature/{{Phaeton}}'', intangibility allows for full transvection when partially inside something, preventing the user from passing through the ground but means that if they don't see something coming it will not pass through them, alternatively it is achieved through tiny short range wormhole generation.
[[/folder]]

[[folder:Western Animation]]
* ''WesternAnimation/BuzzLightyearOfStarCommand'': Voluntary intangibility is an inherent ability of the Tangean people, including ranger Mira Nova. It's more often used to walk through walls and even phase through floors (in-universe it's called "ghosting"), but on a handful of occasions, it's been shown to allow projectiles to pass right through Mira without harming her. [[spoiler:On one occasion, she ghosts into Buzz's body. Ew.]]
** Mind-reading is another, lesser-used, Tangean ability, in which Mira ghosts her hand into the subject's head.
* ''WesternAnimation/BatmanBeyond'': An unscrupulous reporter stole a device that gave him this power so he could spy on anyone he pleased and make a fortune as a celebrity gossip columnist. In the end, he subverted the trend and ''did'' suffer the KarmicDeath (he not only stole the device, but killed the inventor with a fire he set to cover his tracks) of becoming permanently intangible and falling first through each individual floor of the building he's in, then falling through the ''basement'' into the ground, and then, presumably, the Earth's crust all the way to the core. Depending on whether or not heat/gravity has any effect on him, and how long he can survive in an intangible state, it may be a horrific AndIMustScream ending of the kind ''Beyond'' loved to spring on the audience.
** Since the intangibility is simply an effect granted by a full-body suit, it's likely that at most he has only three days before he starves/dehydrates to death in the suit, assuming its internal air supply (which you would expect it to have, solving the "how do you breathe" issue) lasts that long.
* The lead character of ''WesternAnimation/DannyPhantom'' has this as part of his ghost powers, as well as flight (solving some problems) and invisibility (introducing new ones).
* Ghostfreak in ''WesternAnimation/{{Ben 10}}''. At one point, someone manages to turn the intangibility off, leaving Ghostfreak stuck in solid form temporarily.
** As well as Big Chill from ''WesternAnimation/Ben10AlienForce''.
* ''WesternAnimation/TheVentureBrothers'' has the villain the Intangible Fancy, whose henchmen are all equally intangible.
** Also, "the Investors," a mysterious trio of men in the employ of the [[WeirdTradeUnion Guild of Calamitous Intent]] known for making DealWithTheDevil type deals. Bullets and knives are shown to pass right through them, and they can even phase others through solid matter.
* In ''WesternAnimation/TeenTitans'', this is just one of Raven's [[NewPowersAsThePlotDemands superpowers]].
* ''WesternAnimation/XiaolinShowdown'': [[CallingYourAttacks SERPENT'S TAIL!!]] It even becomes a plot point when [[spoiler: Wuya combines its effects with the Reversing Mirror to become tangible again. Why this actually brought her back to life instead of just making her a solid ghost is left entirely unexplained, though.]] The Serpent's Tail later becomes Chase Young's weapon of choice.
* In ''WesternAnimation/LegionOfSuperHeroes'': Phantom Girl has this ability, as apparently does the rest of her planet.
* In ''WesternAnimation/TransformersPrime'', the Phase Shifter grants its user intangibility. As a nod to RequiredSecondaryPowers, it is explicitly stated to work intuitively, so you don't end up phasing through the floor by accident.
[[/folder]]

[[folder:Real Life]]
* Neutrinos act very much like this, as they can (and do) pass through people, buildings, and even entire planets without interacting with anything in their path. It takes a very sensitive detector in large tanks of very pure water deep underground to detect their presence, and even then the massive burst of neutrinos from a supernova yielded only about 6 confirmed interactions.
[[/folder]]

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