%% This is not a YMMV page. Please do not link to any YMMV tropes such as Goddamned Bats or Demonic Spiders, no matter how annoying or
%% dangerous the enemies are.
[[quoteright:324:[[TabletopGame/DungeonsAndDragons http://static.tvtropes.org/pmwiki/pub/images/Invisible_Stalker.jpg]]]]
[[caption-width-right:324:[[LiteralMetaphor The textbook example]].]]

->''"Oh look, they were too cheap to hire villains!"''
-->-- '''Joel Robinson''' on invisible enemies, ''Series/MysteryScienceTheater3000''

You can't see them, but they can probably hurt you.

Many invisible enemies are just [[UndergroundMonkey variants of ordinary monsters]]. Or [[TheUnseen their true forms are never revealed at all]]. In VideoGames, these tend to be {{Stealthy Mook}}s and frequently overlap with GoddamnBats or DemonicSpiders. Sometimes, they become visible when doing specific things, like attacking, dying or moving.

In other media, especially Television, an Invisible Monster is used to save budgets for more outlandish monsters. Often, they are accompanied by creepy noises or music that alerts the Audience to their presence. Done poorly they can be [[{{Narm}} laughable]], done right, terrifying.

Not to be confused with [[Literature/InvisibleMonsters the Palahniuk book.]]

See also {{Invisibility}}. Take note of [[NothingIsScarier Nothing Being Scarier]], which is why this can work at all.


[[folder:Anime and Manga]]
* In ''Anime/MagicalGirlLyricalNanohaStrikerS'', we learn that an invisible [[MechaMooks Gadget Drone]] was what [[spoiler: nearly killed Nanoha during the SnowMeansDeath incident]] after another one of them [[spoiler: [[NormallyIWouldBeDeadNow stabs Vita through her chest]]]] during the final mission.
* [[TheHeartless Hollows]] in ''Manga/{{Bleach}}'' could not be seen by anyone who could not [[ISeeDeadPeople see dead people.]] This lead to the first few episodes having these...things chasing people that nobody could see. Only the footprints and scenery destruction following them.
** Even those who can see dead people have trouble seeing them; you need to have a lot of dead person energy built up. Even Ichigo couldn't see them until the start of the series, and he had trouble telling the dead from the living when he was younger.
* The "Power" card from Manga/CardCaptorSakura is depicted as this. Until Sakura challenges it to a battle, it is only seen by the craters it leaves behind.
* In ''Manga/JojosBizarreAdventure'' part 6, the Stand ''Music/LimpBizkit'' revives the user right after death as an [[OurZombiesAreDifferent Invisible Zombie.]] [[MakesJustAsMuchSenseInContext Yeah.]] It also resurrects nearby corpses (such as a recently-dead [[RaisingTheSteaks crocodile]]) that relentlessly attack living things in search for [[BrainFood brains.]]
** And in a more broad sense, most Stands are this to non-Stand users. As a rule, Stands cannot be seen by normal people and cannot be harmed by anything other than other Stands. The Stand users, being mostly normal people (or animals) aside from their abilities, [[CaptainObvious can usually be seen and harmed just as usual, however.]]

* Creator/BillCosby recalled how his father tried to keep him in bed while dad and mom went out by warning him there were snakes all around his bed waiting to bite him if he crept out.
-->'''Bill:''' I don't see any snakes!\\
'''Dad:''' They're ''invisible!''

[[folder:Fan Works]]
* Lampshaded during an argument between MadScientist Dr Zarkendorf and the alien monster D'Ork in ''Plan 7 of 9 from Outer Space''.
-->"And what about the potion YOU invented the one that was supposed to turn me into a terrifying Invisible Monster? (* see 'Attack of the No-Budget Special Effect')."
-->"That worked!"
-->"Yes you bungling brainiac, the light passed through my entire body including my retinas! I couldn't see a blasted thing!"

* Not seen (but present) in ''Film/TheBladeMaster'', since visible monsters would've strained the budget.
* ''Film/{{Predator}}''. The titular alien hunter uses a VisibleInvisibility cloaking device, which is a cool special effect and obviously not a budget-saving shortcut. It also has a rather embarrassing [[NoWaterproofingInTheFuture weakness of water]].
* The film ''Captain Sinbad'' has the title character face an invisible monster that leaves dinosaur-like tracks in the ground (that form from an explosion as its feet land). Considering all of the SpecialEffectsFailure monsters that appear, it's rather startling.
* The Monster from the Id in ''Film/ForbiddenPlanet''.
* There's a movie called ''The Sound of Horror'' about invisible dinosaurs. ''That'' is a low budget.
* The titular "witch" of ''Film/TheBlairWitchProject''.
* In 1984's ''Film/{{Supergirl}}'', the Girl of Steel fights an invisible demon summoned by the villains.
* ''Film/InvisibleInvaders'', [[ExactlyWhatItSaysOnTheTin of course]]. Invisibility is the main weapon of the extraterrestials and big part of the plot consists in finding how to make them visible to the humans.
* The title creatures in ''Film/FiendWithoutAFace'' are invisible for most of the film, until they absorb enough radiation to become visible.

* Creator/AmbroseBierce's ''The Damned Thing'' featured an early example of an invisible monster. Bierce was cited as an inspiration by Creator/HPLovecraft.
* Subversion: ''Literature/TheVoyageOfTheDawnTreader'' by C.S. Lewis had the Dufflepuds, who only ''seemed'' to be enemies at first, but who just wanted Lucy to undo the spell that made them invisible.
* The Hand That No One Sees, in ''Literature/BridgeOfBirds''.
* The Gnoolies, in Creator/RoaldDahl's ''Literature/{{Charlie and the Great Glass Elevator}}''.
* Creator/HPLovecraft:
** The titular entity in "Literature/TheDunwichHorror".
** Abdul Alhazred, the author of ''[[TomeOfEldritchLore Necronomicon]]'', was devoured alive by an invisible monster.
* [[Literature/{{Discworld}} The Agatean Empire]] is [[SuspiciouslySpecificDenial most definitely not]] under attack by 2,300,009 invisible vampire ghosts.
* Whatever is stalking the assorted characters in ''Literature/HouseOfLeaves''.
* The [[ExactlyWhatItSaysOnTheTin unseen]] in ''Literature/SsaliaAndTheDragonsOfAvienot'', [[spoiler:via InvisibilityCloak, as Ssalia discovers]]. They can be seen by people close to death and their fellow unseen, however.
* The dinosaur ''Carnotaurus sastrei'' in [[Creator/MichaelCrichton Crichton's]] ''[[Literature/TheLostWorld1995 The Lost World]]'' have chameleon- or cuttlefish-like color-changing abilities which render them virtually invisible. Even the ''tyrannosaurs and velociraptors'' don't go anywhere near their territory. [[spoiler: Except during the day, when there's too much ambient light for their camouflage to be convincing.]]
* In the ''Literature/ParadoxTrilogy'', the {{Eldritch Abomination}}s called phantoms are invisible due to being composed of pure psychic energy.
* "The terror" in ''Literature/TheThoughtMonster''.
* In ''Literature/{{Updraft}}'', a major threat to the citizens of the city are skymouths, flying creatures which are completely invisible except for the mouth they open to eat you with. Naturally, they're hard to defend against, and the protagonist's ability to repel them is why the Singers are so keen to force her join up.
* In ''Literature/LoyalEnemies'', the second generation of MixAndMatchCritters bred by the villains ends up dubbed "manglers" by the villagers they attack. It is an invisible wolf-werewolf hybrid bred to be vicious, insanely fast and resilent and docile in the presence of their masters. They also multiply by killing, twenty dead people per one new mangler, meaning one mangler can attack a village and out come five of them.

[[folder:Live-Action TV]]
* ''Series/FraggleRock'': The Invisible Garboyle from "Gobo's Discovery".
* ''Series/KolchakTheNightStalker'' featured two {{Eldritch Abomination}}s portrayed this way.
* {{Hell Hound}}s in ''Series/{{Supernatural}}'' are invisible to everyone but their target. They can also be seen with glasses that were burned by holy fire.
** One fun subversion was the monster in "Party on, Garth" that was invisible to anyone who was sober.
--> '''Garth:''' Right. So... Whoa. Monster you got to be drunk to see. Cool! Also... hard to fight.
* Mirror Monsters in ''Series/KamenRiderRyuki'' (and its American adaptation ''Series/KamenRiderDragonKnight'') can only be seen by those who've been to the mirror world; to everyone else, they're this.
* Parodied in ''Series/RedDwarf'', with a [[TheresNoBInMovie B movie]] titled 'Attack of the Giant, Savage, Completely Invisible Aliens'', which consists of [[BadBadActing Bad Bad Actors]] pointing at the sky and saying "It's the giant, savage, completely invisible aliens!"
* An Episode of ''Series/TheXFiles'' featured the angry spirits of animals being abused by a circus manifesting as physical, but invisible, phantasms: one fellow got mauled to death by an invisible tiger, on-camera, both out- and in- universe.
* ''Series/DoctorWho'':
** The Krafayis from episode "Vincent and the Doctor", although it shows up in mirrors.
** Played with during ''[[Recap/DoctorWhoS14E4TheFaceOfEvil The Face of Evil]]''. When some of these start chasing the Doctor and Leela, the Doctor deduces that the creatures can't be following them by sight, since light would just pass through their eyes if they even had them. He uses the vibrations of an alarm clock to distract them.
** In "Midnight", the monster was more or less invisible, only 'showing' itself when it inhabited other people's bodies. We never did find out what it looked like.
** The Visians of planet Mira in "The Daleks' Master Plan" are this played straight.
** The Spiridons in "Planet of the Daleks," whose powers of invisibility the Daleks are attempting to learn and imitate.
* ''Series/StargateSG1'' has featured the Re'tu, big spider aliens which are invisible because they are "180 degrees out of phase from normal space-time". Fortunately, it doesn't take long to come up with a special kind of "flashlight" that can make them visible (which comes in very handy against later invisible foes in the series).
* ''Series/{{Batman}}'' had such an episode in its cheap 3rd season and it took the concept even further in the climatic fight when the heroes kill the lights to even the odds fighting against multiple invisible enemies and the fight concludes in total darkness.

* The title creature in the ''Radio/QuietPlease'' episode "The Thing on the Fourble Board".

[[folder:Tabletop Games]]
* ''TabletopGame/DungeonsAndDragons'' has several invisible monsters, but perhaps ''the'' invisible monster is the Invisible Stalker ("pictured" above), which is, [[ExactlyWhatItSaysOnTheTin well]]. The 2nd edition ''Monstrous Manual'' features an illustration for every monster entry, and no less than two people are credited for the illustration for the Invisible Stalker... which is, of course, a blank.
** Continuing with this joke, they once released a miniature for the Invisible Stalker - which was just a base with no figure on it.
** Also Hellcats, also known as Bezekiras. They're lionlike feline monsters from Hell that are invisible in the light, but appear as a glowing silhouette in darkness.
* ''TabletopGame/{{Deathwatch}}'' makes mention of an unknown Tyranid organism kept imprisoned within the Deathwatch fortress. It was caught in a stasis field, freezing it in time, but other than the fact that the trap was activated, the Deathwatch are incapable of detecting whatever is in there. It cannot be seen, or heard, with even their most sophisticated equipment.

* ''Theatre/PeerGynt'' has the great Boyg, a mysterious unseen creature that Peer encounters on his way back from the troll kingdom. It blocks Peer's way at every turn and tells him to "go roundabout." Peer finds that he can't fight his way through it.

* Videogame/DeadlyRoomsOfDeath has spiders that camoflauge like HollywoodChameleons. Unless you [[AntiFrustrationFeature activate a vision token or turn on puzzle mode]], you can only see them when they move, or you get close.
* ''Tecmo Super Bowl'' for NES had a glitchy password which removed the opposing team from view... as well as the field. The Gameboy version at least had the decency to keep the field.
* In ''VideoGame/AmnesiaTheDarkDescent'', one of the most frightening areas is a basement flooded knee-deep with dark water. Shortly after entering the water, there is a splashing sound in the darkness ahead and then you only hear and see the splashing footsteps of something charging right at you. As long as you keep climbing on the crates that are littered through the area, you are quite safe, but as soon as you step into the water or drop something into it, the invisible creature comes charging again.
** In a later section, you enter a mostly drained cistern which has walkways that lie above the water. Many players never enter the water at all out of fear that [[NothingIsScarier there could be]] another of those creature in it. [[spoiler:There normally isn't, but when you take too long in the room, the game adds one, even if you have stepped into the water safely before.]]
* ''Franchise/TheLegendOfZelda'':
** ''VideoGame/TheLegendOfZeldaOcarinaOfTime'' has the [[WallMaster invisible hand monsters]].
** This mod of ''Ocarina'' based on the beta has [[http://www.youtube.com/watch?v=OLPkqu8un00 invisible Redeads]]. That presumably rise up from the ground. Sweet dreams.
** And ''VideoGame/TheLegendOfZeldaMajorasMask'' had invisible Skulltulas, which you could run into before you got the Lens of Truth.
*** However, you can still use the CameraLockOn to find them. You just can't see whether they're about to attack you.
*** ''VideoGame/TheLegendOfZeldaOcarinaOfTime'' set the precedent for invisible Skulltulas: In the hidden passage under the boulder near the tree in Jabu Jabu's area that leads to a Gold Skulltula, there are invisible Skulltulas hanging from the roof that can give an unaware player a nasty shock. There is also an invisible one hinted at by a "Danger above!" sign in Kakariko's Bottom of the Well section.
** ''VideoGame/ZeldaIITheAdventureOfLink'' has invisible ghosts in the abandoned town. Also, before you have a source of light, the caves are full of invisible enemies; passing through this is necessary to continue.
** ''VideoGame/TheLegendOfZeldaTwilightPrincess'' has [[spoiler:zombie rats]].
*** And the poes which are completely invisible in the day, while at night you can see their floating lantern.
*** Both of these are easily seen as a wolf while in "sense" mode.
*** The Arbiter's Grounds miniboss is a giant ghost who at first manifests as a giant floating sword, turns visible when attacked, and fades back to visibility.
** ''VideoGame/TheLegendOfZeldaLinksAwakening'' has a group of invisible enemies directly outside the room with the item that makes them visible. Said item is intended for a few other (non-battle) purposes.
** ''VideoGame/TheLegendOfZeldaPhantomHourglass'' has a boss like this -- but you can see yourself through the monster's perspective in the second screen, and judge its rough location.
** Let's not forget Ganon in the [[VideoGame/TheLegendOfZelda original game]]. He's invisible until you can shoot him with the Silver Arrows, except for a very brief period after you strike him with your sword. The only way to figure out where he is is by extrapolating from the start location of the fireballs he shoots.
** Ganon also pulls this off in ''[[VideoGame/TheLegendOfZeldaALinkToThePast A Link to the Past]]''. Even worse, he's utterly invincible while doing so. Good thing [[BossArenaIdiocy he doesn't try to destroy the lanterns in the room that can reveal his location when lit]].
* There are a number of enemies in the ''{{Metroid Prime Trilogy}}'' that require the use of other visors to track. You usually run into at least one ''before'' you get the visor...
** That robot guarding the Power Bombs in ''VideoGame/MetroidPrime'' is an exception as it is invisible to all of the available visors, but its stealth is ruined by muzzle flash.
*** It also can't be scanned or locked onto. However, if you have the Wavebuster, prepare for a short fight (thank god). And, if you've been {{Sequence Breaking}}, it actually can be seen with the X-Ray Visor, which shows that {{The Computer is a Cheating Bastard}} and allowing it to periodically put up a shield.
** The Chozo Ghosts, which are invisible when not attacking. You need to use the X-Ray visor to see them.
** The Omega Pirate makes itself invisible when it's recharging. You need to use the X-Ray visor to see it. But just in case you weren't paying attention to the boss's recharging health bar, visible Beam Troopers show up as a distraction...
** The second form of the Metroid Prime itself occasionally makes itself invisible to the visor you're using.
** ''VideoGame/{{Metroid Prime 3 Corruption}}'' has the Steamlord miniboss, who is invisible most of the time until he has to revive his flunkies. It's possible to fight the last one of those after getting the X-Ray Visor, which makes the fight a lot shorter.
*** Unfortunately however, enemies using hypermode short out that visor, making those fights very annoying on the highest difficulty (where any enemy that can go into hypermode most likely will do so immediately)
* The assassins in ''VideoGame/HalfLife1'' turn invisible when they move if you play on the Hard [[DifficultyLevels Difficulty Level]].
* The Bloodsuckers in ''VideoGame/{{STALKER}}'', humanoid monsters with a mass of tentacles for a mouth, can turn invisible, to add to the fact that they can move fast and take a lot of hits from the stronger rifles.
* Specters in ''VideoGame/{{Doom}}'' are almost-invisible versions of the pink Demons, and practically are invisible in dark areas.
** A similar effect can be achieved in ''VideoGame/DukeNukem3D'' through the use of palette-swapping and translucency in the level editor.
* The title monsters of ''VideoGame/TimeSplitters'' are mostly invisible, except when they're being shot.
* Appeared in the original ''VideoGame/MetalGear'', and again in ''VideoGame/MetalGearSolid'': Four ordinary grunts, all wearing active camo, in a small room.
* The Spy in ''VideoGame/TeamFortress2''. Cannot attack while invisible, though.
** The Assassin in ''Dark Messiah'' (multiplayer). 'Can' attack when invisible (breaking the invisiblity), however, the invisibility itself is more of a cloak meant to assist in stealth - walking in bright-lit open areas around sharp-eyed players will get the Assassin spotted.
* ''VideoGame/PerfectDark'' has a weapon that gives the mooks a cloaking device.
* The ''[[VideoGame/DarkForcesSaga Jedi Knight]]'' games have the Force Power "[[JediMindTrick Mind Trick]]" which in multiplayer renders the players invisible.
* ''VideoGame/PrinceOfPersiaWarriorWithin'' and ''VideoGame/PrinceOfPersiaTheTwoThrones'' have these- though in Warrior Within they're just invisible versions of the normal ninja enemies.
* ''VideoGame/SuperSmashBros. Melee'' also has the cloaking device. As a few comic strips have noted, in Smash, if they can't see you, ''you can't see you either''. This generally results in such mishaps as falling off the edge of the map. But to be fair, when you move or attack, you have a InvisibilityFlicker, so you aren't ''blind''.
** On the positive side, the user accumulates no damage for the duration. For some reason.
*** And, of course, there's the bonus for pulling off at least one KO while cloaked.
** Of course, [[TheComputerIsACheatingBastard the computer controlled opponents won't fall off on their own, and can still see you.]]
** It's also utterly useless for hiding if you you're playing with your name on to save your records as it will appear above your head at all times, even when cloaked.
** Replaced with the smoke ball in Brawl, though that game still has an option to [[HilarityEnsues make everyone invisible for the whole fight]].
* The Sorcerers in ''{{VideoGame/Gauntlet}}'', distinguished by their purple robes, wink in and out of existence as they charge towards you. The Super Sorcerers in ''Gauntlet II'' are able to use this ability tactically, appearing at the edge of the screen, firing at you, and then disappearing.
* ''VideoGame/InFAMOUS'' has some enemies in the third island that can cloak themselves - the flying grenadier machines, and the shotgun conduits.
* ''Franchise/{{Castlevania}}''
** Bitterflies in ''VideoGame/CastlevaniaSymphonyOfTheNight'', which phase in and out of visibility in large, seemingly empty rooms.
** Strangely avoided in the sequel ''VideoGame/CastlevaniaPortraitOfRuin'', where there is an Invisible Man enemy, but they actually start out wearing a hat and trenchcoat, so you know where they are. Once they sense you, however, they take off said hat and trenchcoat and really are invisible (barely visible via a few intentionally misplaced pixels here and there). However, it's rare that they'll be able to do much while truly invisible; they don't take that many hits to destroy.
** Both of the above enemies are back in ''VideoGame/CastlevaniaOrderOfEcclesia.''
** Nemesis and Alastor in ''VideoGame/CastlevaniaAriaOfSorrow'' are invisible enemies with visible weapons. Nemesis's soul grants Soma the ability to turn invisible. There's also the Sky Fish, which isn't invisible-- it's that weird shooting star thing you see in certain rooms. [[GuideDangIt Betcha didn't know THAT was a monster!]]
* ''Franchise/ResidentEvil''
** The [=GameCube=] remake of ''VideoGame/ResidentEvil1'' features a challenge mode in which '''all''' of the monsters are invisible. Prepare to die repeatedly.
** ''VideoGame/ResidentEvil4'' features an enemy located in an AbsurdlySpaciousSewer called the "Novistador". These enemies are invisible until they die, and their bodies become visible.
** ''VideoGame/ResidentEvilRevelations'' features the Farfarello enemies which are invisible versions of the Hunter enemies from previous games. Consider that the hunters were already a threat ''without'' being invisible, and that Farfarellos only attack in groups...yeah, you better pray that you don't get swarmed by them and caught in a hit/stun lock, and that you have enough ammo left over, because you're probably gonna die otherwise, even with them being weakened somewhat compared to the Hunters from previous games.
* There is a type of invisible robo-coptor in ''VideoGame/MegaManZXAdvent''. Siarnaq's/Model P's radar can see them though, and shoot them. They also do an InvisibilityFlicker when they shoot.
* There is a variation of this in ''VideoGame/WorldOfWarcraft''. If you visit the Kodo Graveyard, there are visible vultures that are hostile and will attack you, but if you visit the graveyard while dead in spirit form, you will notice friendly Kodo Spirits scattered around.
** There are also level 50 invisible ghosts in one area of Duskwood. A zone for characters at about half that level. Prepare to die if you hit one by accident.
*** In the same vein there are level 5 ghosts in the courtyard outside of Undercity. These are much less a threat as by the time you hit the zone you're already level 5 and you don't have any spells that would hit them at this level anyways. Both of these can be seen with spells or potions that detect invisibility.
** Interestingly, both spirit form and invisibility follow a pattern where if two entities have it, they can still see eachother. In some dungeons, the Mage's Invisibility spell was useful to spot monsters who were invisible for that exact reason.
* ''VideoGame/WarcraftIII'':
** While there is an ability to attack without breaking invisibility (called, appropriately enough, Ghost), the only unit that has it in the standard game is the Undead Shade, who doesn't ''have'' an attack. Unlike ''Starcraft'', there's no "warping" to indicate that there's a moving unit, but the unit's projectiles do appear.
** Shadowmeld is an ability shared by Night Elf women and human bandits, which grants invisiblity at night when not moving.
* ''VideoGame/NetHack'' takes this to the extreme. In addition to having two types of enemies that are permanently invisible, it contains methods that allow pretty much ''any'' creature in the game to become invisible.
** [[spoiler: Potions/wands of invisibility make living things (not items) permanently invisible. If a monster sees one on the ground, it will pick it up and use it. To top it off, these are considered "defensive items" and pretty much every monster has a chance to receive one at spawn time.]]
** [[spoiler: Cloaks of invisibility. Monsters that can wear armor will pick them up and don them.]]
** [[spoiler: Every sufficiently high-level spellcasting monster can cast an invisibility spell on themselves. Every sufficiently high-level spellcasting monster usually does the moment they see you.]]
* ''Franchise/FinalFantasy''
** In ''VideoGame/FinalFantasyVII'' , if you hit the 'ghost' monster, it turned invisible. You could still target it, but you would almost certainly miss. Not so in reverse.
** ''VideoGame/FinalFantasyVI'' has an invisible BonusBoss on a small island. It is [[PermanentlyMissableContent lost forever]] when the world explodes. Enemies also become invisible when they have the Vanish status effect, although they can still be targeted. This doesn't happen when your characters have the effect.
** ''VideoGame/FinalFantasyXII'' has a baker's dozen or so of monsters who like to shake things up by being invisible.
* The ''Franchise/{{Halo}}'' series has plenty of invisible enemies using active camouflage:
** In the original ''VideoGame/HaloCombatEvolved'' and ''VideoGame/{{Halo 2}}'', any weapons that glows still remains visible even if held by someone cloaked. One of the funnier moments in ''Combat Evolved'' was watching TooDumbToLive invisible Elites charge you with massive glowing energy swords fully visible in their hands, completely negating the point of the invisibility (especially since they had zero energy shields). This received much mocking in several flash videos.
** However, stealth-capable enemies got more powerful in subsequent games; ''Halo 2''[='s=] Mausoleum MultiMookMelee has invisible [[EliteMooks Ultra Elites]], and by the time you get to ''VideoGame/{{Halo 4}}'', you're fighting invisible Zealots holding invisible one-hit-kill swords.
** In multiplayer, you might run into an enemy player using an active camo PowerUp. Of course, you can do the same thing yourself.
* ''VideoGame/MegaManLegends'' has rather nasty variant in one specific dungeon; Sharukurusus, normally, are fast-moving, hard-hitting robots that chase you down relentlessly upon sighting you and attack with a nasty spinning drill-claw attack. Now imagine taking that and giving it a cloaking device so you can only see it JUST BEFORE IT SLAMS INTO YOU. What makes it worse is that you can still hear their footsteps, so you can hear them charging at you beforehand, but won't know where they'll be attacking from until they're right on your ass. Thankfully, though, you don't have to fight them and can easily avoid them by staying on the higher ledges of the room they're in.
** Unless you're going for the chests, in which case one Reaverbot will ambush you just as you exit the alcove.
* ''VideoGame/CosmosCosmicAdventure'', one of Apogee's old games, had invisible robots that would shove you backwards if you bumped into them. You could barely make out their outline, and if you jumped on them enough, they would become visible. Walking through them from behind would also hurt you.
* The first three ''VideoGame/{{Avernum}}'' games have black shades and guardians. The black shades are also {{Enemy Summoner}}s.
* Two versions exists in ''VideoGame/LaMulana'' : One that [[spoiler:moves so fast that you have to stop time to see it]], and one [[spoiler: that merely requires that you get an item to see them... after going through roughly 10 screens taking random hits from them]].
* The boss of Chapter 3 in ''VideoGame/SuperPaperMario'' is a nerdy chameleon who turns invisible and invincible and runs around the room. However, he has to drop his invisibility to attack you.
* In ''VideoGame/{{Rogue}}'', there are the Phantoms, which can only be seen if you're wearing a 'see invisible' ring.
* ''VideoGame/BaldursGate'' loves this trope. Most wizards will use some variant of Invisibility (usually ''Mislead'') thieves love stocking up on ''Potions of Invisibility'' (especially nasty are the "Rune Assassins" featured in one quest, that have a very nasty backstab and a near-unlimited amount of potions...) Throne of Bhaal ups the ante further, introducing a '''dragon''' that turns invisible, and who cannot be detected unless you use a particular sequence of spells. Ouch.
* ''VideoGame/KirbySuperStar'' had Chameleo Arm, which tended to be invisible...and tended to fire balls of paint which the protagonist could get the Paint ability from to reveal and damage him with.
* ''VideoGame/StarCraft'''s Dark Templar are invisible, and capable of hacking your average infantry unit into two hunks.
** Invisibility is a somewhat important unit attribute, in fact, as stealth units cannot be directly targeted for attack. When fighting a Terran or Protoss player one should always have detector units handy or else be left helpless. Zerg units can't move while invisible but they can burrow to set up ambushes.
* ''VideoGame/DawnOfWar'' games use a similar system to the aforementioned [[VideoGame/StarCraft Dark Templars]] to represent infiltrated units. In the classic and ''Winter Assault'' expansion, this was generally limited by disabling the unit's ability to attack. That is, until ''Dark Crusade'', which ''enabled'' attacking while infiltrated without revealing the unit. This was balanced by different races' detecting units and abilities, but it didn't diminish [[GameBreaker the cheapness of using massed infiltrators]].
** Unlike the other factions, the Necrons don't have a dedicated stealth unit... because one artifact makes every Necron unit in a wide area around the Necron Lord (including the Lord, vehicles and ''buildings'') invisible. Fun.
** ''[[VideoGame/DawnOfWar Dawn of War II]]'' fixed this by making infiltrators reveal themselves if they attack, or if they get within arm's reach of any enemy unit. This is with the exception of the super-infiltrated Cyrus, who can use his incredibly destructive array of explosives and specialist ammunition without breaking Infiltration, but will be otherwise be revealed just like any other infiltrated unit.
* ''VideoGame/AncientDomainsOfMystery'''s Invisible Stalker is...ExactlyWhatItSaysOnTheTin. If you [[spoiler: eat the corpse of an invisible stalker, there's a chance that YOU can become intrinsically invisible]]. Like ''[=NetHack=]'' it also [[spoiler: has spellcasting monsters who will turn themselves invisible.]]
* ''VideoGame/EverQuest 1'' used invisible monsters primarily as {{Underground Monkey}}s. Among the more notable in the early days were the Enchanter pets and the shadowed men. In both cases the characters were invisible but the weapons they carried were not.
* ''Franchise/KingdomHearts'' gives us the Stealth Sneak, first as a BossBattle, then reappearing later on in the Hades Cup. The icing on the cake is one of the latter seeds, consisting of not one but ''two'' Stealth Sneaks to carve up. Mind you, locking onto and hitting one is not affected by whether they are visible or not. They can be detected by sight alone if you look very carefully. Their camouflage produces a "heat ripple" effect, though this is easier to see during the boss fight than during the seed match.
** ''VideoGame/KingdomHeartsBirthBySleep'' also gives us the boss from the [[spoiler: Secret Episode]]. For the entire first part of the fight, the only parts of it you can see are its [[GlowingEyesOfDoom glowing red eyes]] and, when it attacks you, its claws.
* ''VideoGame/SilentHillOrigins'' has invisible monsters in Cedar Grove Sanitarium. The only way to tell where they are is by the metal harness floating in midair, and the eerie person-shaped shadow they somehow cast. Oh, and by killing you in the dark.
** ''VideoGame/SilentHill2'' has a single invisible demon in Toluca Prison. However, since it's trapped in a cell you can't open and can only be "seen" by James jerking his gun toward it when you're close enough, a lot of players fly straight by it without even noticing the first couple of playthroughs. It can be ''heard'', saying something that could be anything from "ritual" backwards to "[[Music/TheBeatles I buried Paul]]", but strange noises are so commonplace in Silent Hill that you don't make that link until you kill it and hear the ''absence'' of the sound.
** The original game has nearly-invisible Larval Stalkers, which can't actually hurt you, and later, the Shadow Children, which can.
* ''VideoGame/CatacombApocalypse'' has invisible monsters (that look kind of like a cross between a red cartoon pig and one of the demons from the same game series). Unfortunately the creators of the game seem to have been rather intimidated by the thought of turning the awesome power of invisibility against the player, so the monsters blink into visibility all the time, move fairly slowly and can't take that much damage, and don't shoot, making them if anything easier than normal opponents.
* ''VideoGame/{{Diablo}}'' has the genuinely creepy The Unseen, which do come visible when they attack, but before that could fill the entire room without you knowing it. Fortunately, they can still be hurt while invisible, so it became standard procedure for adventurers, when opening a new door, to spray the room with arrows, just in case. If you hear a "splorch" sound, keep firing.
** Due to a bug in the level generation routine, they do not respect the safe zone around the entrance. So when you just arrived in the level and you are gathering your bearings, casting {{Mana}} Shield, checking item durability, etc., they could be ''[[RightBehindMe right behind you]], getting closer''. And if this is multiplayer mode, your gear is now on the floor next to a sea of enemies right at the stairs.
* ''VideoGame/DiabloIII'' has the Deceivers, serpents who become invisible as soon as they notice you and then crowd around you before they attack. Unlike the previous example, they can't be hit while doing this, so you have to wait to be surrounded.
* Chapter 10 of ''VideoGame/EternalDarkness'' features a [[OurVampiresAreDifferent telekinetically vampiric]] creature who turns invisible when he's not attacking anyone or getting healed at a shrine. Mercifully, you can use a spell to reveal him.
** That spell is less useful in the final chapter, when it can reveal only some of the invisible Trappers in a room. Good thing they can be {{Helpful Mook}}s.
* ''VideoGame/PlantsVsZombies'' has the mini-game [[PunnyName "Invisi-Ghoul"]]. ALL The zombies are invisible. The only TWO ways to detect them is to 1. use an ice-shroom to cause ice to appear around their feet or 2. the audio cues they make when they appear. Oh, and the Zomboni that runs over your plants [[OneHitKill in one shot]]? Yep, it's fought in this minigame.
* Flying-Neo from ''VideoGame/AlienSoldier'' is an [[NinjaPirateZombieRobot alien zombie dragon helicopter]]. Once its health gets to a quarter, it turns ''completely invisible'' other than the silhouette of its legs against the ground when it flies low. Or when the [[LightningReveal lightning in the background strikes]].
* Do-it-yourself variation can be (not) seen in ''[[VideoGame/TheElderScrollsIIDaggerfall Daggerfall]]''. This game allows players to create their own spells - so it is possible to create custom-made Invisibility spell for casting not on yourself, but on your opponent. Thus player can make opposing monsters invisible - complete with tell-tale blood flying when they are hit.
* A handful of creatures in ''VideoGame/TheElderScrollsVSkyrim'' make use of the [[ExactlyWhatItSaysOnTheTin Invisibility]] spell, usually to cover their retreat when they're critically injured or hopelessly outmatched by their opponent(s). Spriggans and high-level vampires are the most notorious examples. Their invisibility isn't a direct threat because it has a fairly short duration and breaks the moment they attack. What makes it annyoing is their habit to heal themselves and/or recover lots of magicka while cloaked, so when they finally do show up again for another go at your PlayerCharacter, they're often back at full strength from near-death. Thankfully, this type of invisibility is far from perfect, allowing observant players to keep track of the target and hunt it down before it can retaliate.
* In ''VideoGame/ShinMegamiTenseiStrangeJourney'' ''every'' monster is invisible. Fortunately you soon get a program downloaded into your power suit that allows you to detect, confront, and communicate with the demons. However, until you've killed them at least once, every non-boss monster will be rendered as a blob of static that you can't analyze.
* The ''VideoGame/{{Fallout 3}}'' addon "Operation: Anchorage" includes Chinese snipers, who start off cloaked as though using a Stealth Boy power-up. Until they become visible, the player can't target them with the auto-aiming [[FunWithAcronyms Vault-tec Assisted Targeting System (VATS)]]. And to add to the tension, both this and the proximity compass on the HUD identify them as friendlies, until you walk past them just enough to get a critical potshot.
** Somewhat subverted. You can't issue attacks on them via VATS, but the system is still perfectly capable of detecting where they are. Nothing keeps the player from shooting or meleeing at their general direction manually after that.
** Nightkin in ''VideoGame/FalloutNewVegas'', an UndergroundMonkey version of Super Mutants, have the same effect, which is much more difficult to see while climbing Black Mountain at night. Even worse are nightstalkers, mutant coyote-rattlesnake hybrids that can also cloak. It's nearly impossible to make out the tell-tale visual distortion in their dark cave, especially since they're so small and quick, but you can hear their faint rattling and hissing as they approach, sometimes in packs.
** ''VideoGame/{{Fallout 4}}'' makes deathclaws even worse by introducing the chameleon variant. The new assaultron robot can also cloak and some boss enemies in the main story make use of Stealth Boys.
* The turn-based RPG ''VideoGame/{{Odium}}'' features, near the end of the game, a group of invisible monsters which are visible only when they move. You have to remember where they stopped so that you can shoot them (explosive weapons come in handy, as they cover a wide radius). Or you can just look at your character's movement range and check which squares are mysteriously inaccessible...
** They are [[{{Foreshadowing}} hyped]] throughout the game as dangerous enemies, but they're rather weak, being slow and easy to kill. And their poison is ordinary poison that does mediocre damage, rather than [[GameplayAndStorySegregation the supposed deadly toxin that kills in seconds]].
* The V38 Phantom TIE fighters in ''VideoGame/StarWarsRebelAssault II''.
* Anything that has stealth in ''VideoGame/TheLordOfTheRingsOnline'' will appear invisible until the player is nearby ''and'' facing it. By then it may already be too late, especially if the player is a ranged class.
* In ''VideoGame/MarioAdventure'', ghosts are invisible when you are looking at them. Thankfully they still don't move during this time.
* One of the most frustrating missions in ''VideoGame/JakIIRenegade'' involve slaying 30 invisible Metal Heads in Haven Forest. They come in two flavours: humanoids with guns instead of hands which shoot at you from afar and keep moving all the time and big, bulky crabs with machine guns that drop their camouflage when they first spot and procceed to blast you away. The first kind make a brief return in ''VideoGame/Jak3Wastelander'', although only in one quest.
* The aptly named Unseen Terror from ''VideoGame/{{Enchanter}}''.
* One level of ''VideoGame/PathwaysIntoDarkness'' is populated by Wraiths, who can only be seen with infra-red goggles. To trip you up, there's also a Banshee in the level, who can't be seen while you have the goggles equipped.
* The ''[[VideoGame/FirstEncounterAssaultRecon F.E.A.R.]]'' series has the nearly-invisible [[McNinja Replica Assassins]]. The [[CanonDiscontinuity non-canon]] expansion packs feature the just-as-invisible Shades, supernatural versions of the Assassins[[labelnote:*]]not an understatement: the Shade has the exact same AI behavior as the Assassin[[/labelnote]] that are apparently controlled by Alma. While the Assassins' cloak tends to spark brightly and fail if they're hit (the only way you'll be able to see them coming), the Shade is more subtle but more consistently easy to pinpoint, as they whisper and growl constantly and their [[RedEyesTakeWarning red eyes]] [[GlowingEyesOfDoom shine in the dark]].
* One level in ''VideoGame/DemonsSouls'' has invisible enemies that you probably won't even know are there until they stab you in the back, which is likely to [[NintendoHard kill you outright]].
* ''VideoGame/KingsQuestMaskOfEternity'' had one of these in the Frozen Reaches, which served as a GiantSpaceFleaFromNowhere as well.
* ''VideoGame/TheHidden'': 8 troopers vs. 1 invisible KnifeNut. The titular Hidden has ''Film/{{Predator}}''-type invisibility, but, unlike him, is entirely waterproof.
* In ''VideoGame/WizardOfWor'', Garwors and Thorwors could turn invisible at times, though they would still appear on the radar screen.
* Certain enemies in ''VideoGame/BubbleTanks 3'' have the ability to use stealth, which turns them invisible. ''Bubble Tanks Tower Defence'' has the Stealth enemy, which is invisible to the player. When damaged, their invisibility wears off for a short time.
* ''VideoGame/MiniRobotWars'': The Mole is able to dig underground unseen, while the Ghost is able to fly past your units unseen. While the player ''can'' see them, the minirobots will not unless you have a radar or surveillance robot platform.
* ''VideoGame/NintendoLand'' has the Luigi's Ghost Mansion multiplayer game, which is an interesting inversion where one player actually gets to play as the invisible monster. The person playing as the ghost uses the game pad and is invisible to the other players, who are trying to shine their flashlights on him.
* ''VideoGame/DungeonCrawl'': Similar to fellow Roguelike ''[=NetHack=]'' above, Crawl features permanently invisible monsters as well as an Invisibility spell and wand that will be liberally employed by any monster with access to them. Enemies you can't see get considerable bonuses in combat and can easily corner you without warning, but this is balanced somewhat by the common Scroll of Fog marking the tile they're on with a "strange disturbance" to aim spells or ranged weapons at.
* ''VideoGame/{{Borderlands 2}}'': Stalkers. Better have a good shock weapon handy, as there's a reason they're called "Invisibl Assholes" in-game. There's also the Hyperion Infiltrator, a cloaking-enabled shotgun-toting ambush unit. These, too, can be revealed by depleting their shields. Canonically, Handsome Jack blatantly nicked this idea from Dahl's Lost Legion Scouts in ''VideoGame/BorderlandsThePreSequel'', who operate in a similar fashion.
* The aliens in ''VideoGame/EnemyZero'' are completely invisible; your only way of detecting their presence is with the use of a device Laura plugs into her ear, causing nearby movement to be gauged via tones which change in pitch and tempo depending on the aliens' proximity to you, and whether they are in front, beside, or behind her. Oh, and encountering one is also a OneHitKill, and your only weapon against them carries ''very'' limited charges at a time.
* ''VideoGame/GhostHacker'' has the Ghost, which has a stealth ability that makes them nearly invisible and prevents almost all your towers from detecting them. Thankfully, the Scanner tower destroys their stealth.
* ''VideoGame/{{Descent}}'' likes this one. Invisible enemies go from being rare to semi-common in the latter half of the game. This is one of the reasons you have a Spreadfire Cannon. Early on, they often show up in brightly lit areas so you can just barely see their outline, but later they start showing up in dimly-lit areas.
* Priscilla in ''Videogame/DarkSouls'' can make herself invisible during the battle. Unfortunately for her, you can still track her by her footprints in the snow.
* ''Videogame/DarkSoulsII'':
** The human enemies in the Shaded Woods all appear as barely-visible white outlines, and, to make things worse, their primary hunting grounds are under perpetual heavy fog. You cannot lock onto them and there is no way to undo their invisibility, except for a certain DLC item (which you are practically guaranteed to not have access to until long after you've cleared the area).
** Darklurker can pull Priscilla's trick, and since he spends the whole battle floating above the ground, he doesn't leave any prints. You can still lock on to him while he's invisible.
** The King's Pet Aava in the ''Crown of the Ivory King'' DLC, however, is ''always'' invisible until you get an item that lets you SeeTheInvisible. There are also several human enemies that are similarly invisible.
* ''VideoGame/DarkSoulsIII'': Sister Friede pulls a similar trick to Priscilla, as part of her being a walking CallBack to that boss. She can briefly turn invisible, jump to another location, and then attack you around ten seconds later. Her invisibility is undone if you get close to her, however, and you can still track her position by sound and by the puffs of snow she kicks up when jumping.
* In ''VideoGame/{{Faria}}'', invisible enemies make RandomEncounters annoying and towers treacherous long before you get the [[SeeThruSpecs Magic Glasses]] that let you see them.
* A few Badniks in the ''VideoGame/SonicTheHedgehog'' series tend to be this... then they appear and you can Spin Dash them.
* ''VideoGame/BrothersATaleOfTwoSons'' has some sort of invisible yeti creature. The effect is rather wasted on it due to its dumb and stompy nature.
* ''VideoGame/LuigisMansion'': Many of the Portrait Ghosts are invisible unless Luigi is looking away from them. Two rooms also have invisible Grabber ghosts. One of them has a giant mirror on the wall, and the Grabbers' reflections are visible, while the other has a projector, and the players has to track the Grabbers by their shadows on the screen.

[[folder:Web Originals]]
* Cor's tickle monsters are invisible and amorphous. They wear gloves when they want to be seen. Lots and lots of gloves.
* The ''Wiki/SCPFoundation'' has a few examples of these.
** SCP - 966: a skeletal-looking monster species that hunts humans by depriving them of sleep, and can only be seen in the 700-900 nm wavelengths of light, meaning they're only visible in the ultra-violet. Inflicting second or third-degree burns renders them visible, however.
** SCP - 870: a species of creatures that can only be seen by schizophrenics, and can take a variety of nightmarish forms such as "An alligator with spider legs and three eyes, A man made out of smoke, A giant ant with a human face." among others. [[spoiler: The worst part is that it's strongly implied at the end that even schizophrenics can only see small glimpses of these creatures, implying that they're possibly {{Eldritch Abomination}}s that we can't properly visualize. What's worse? They live in densely populated areas.]]

[[folder:Western Animation]]
* One ''WesternAnimation/JonnyQuest'' episode is ''titled'' "The Invisible Monster". At least, it's invisible until [[spoiler: the heroes cover it with paint, allowing them to see it--and then destroy it.]]
* In ''WesternAnimation/StevenUniverse'' episode "Island Adventure" has a invisible gem monster, being covered in mud showed what it looks like.
* Parodied to hell and back in ''WesternAnimation/{{Freakazoid}}'' with Invisibo, who is invisible pharaoh who can only be seen via his scepter. However, when we first see him, his scepter is being held by string, prompting a WeInterruptThisProgram to declare the Network is embarrassed by this and gives the show extra money to make it ''believable.''