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[[quoteright:350:[[VideoGame/{{Growl}} http://static.tvtropes.org/pmwiki/pub/images/GSFfN_Growl_Montage_Clean_7875.JPG]]]]
[[caption-width-right:350:Poachers... poachers... more poachers...\\
%% When adding examples, remember that the boss must be irrelevant to the plot. If they are The Man Behind the Man or otherwise connected to the story, they
%% don't count, no matter how sudden their appearance is.
->''"I'm guessing if [[BigBad Megatron]]'s not the final boss, it's gotta be Galvatron, or maybe Unicron, or Fuckitron, who knows... oh, it's [[Franchise/{{Godzilla}} Mechagodzilla]]. [[SarcasmMode Of course, I should've known.]]"''
-->-- '''[[WebVideo/TheAngryVideoGameNerd The Angry Video Game Nerd's]]''' [[http://cinemassacre.com/2009/06/17/transformers/ review]] of ''VideoGame/TransformersConvoyNoNazo'' [[note]]It's actually someone who makes marginally more sense: [[http://tfwiki.net/wiki/Trypticon_%28G1%29 Trypticon]].[[/note]]

A Giant Space Flea From Nowhere is a boss with no relevance whatsoever to the actual plot, and who comes out of nowhere. They are frequently mindless creatures or beasts as opposed to actual characters, and tend to appear at the end of [[{{Filler}} unimportant plot threads]], such as {{Fetch Quest}}s.

Compare the non-video game boss equivalent, the BigLippedAlligatorMoment, which applies mostly to scripted scenes that came out of nowhere and have little or no mention of it afterward. If the boss and/or the battle is really weird and nonsensical even in the context of the game, there may be some overlap between the two tropes.

Note that, [[IThoughtItMeant contrary to what the name might at first seem to indicate]], the Space Flea is not always an EldritchAbomination, though overlap is possible. If it makes sense in the plot, it is not this trope regardless of how weird the boss might be. In other words, [[VideoGame/ChronoTrigger Lavos]], [[VideoGame/FinalFantasyVII Jenova]] and any other alien world-destroying parasites that are essential to the storyline of the game do not qualify, even if they're literal space fleas from the darkest depths of the universe. In more fantastical settings, they tend to be SingleSpecimenSpecies.

Also, note that most games that include RandomEncounters, or that have no thematic consistency to their enemies, are pretty much incapable of having a Giant Space Flea From Nowhere. In those games, even the normal enemies appear suddenly and [[ArtifactMook without any connection to the story]]; the bosses are therefore just a plain old instance of GameplayAndStorySegregation, same as the normal battles.

SubTrope of LoneWolfBoss. DiabolusExNihilo is the non-video game equivalent: a bad guy who pops up out of the blue, does some damage, and dies. Contrast OutsideContextVillain, which is a villain whose indeterminate origin is the source of their mystery and danger. Sometimes explained with AllThereInTheManual, but that might be an AuthorsSavingThrow. As you can see, many a BonusBoss is not included because they are technically a BonusBoss and may even be outside of canon. Not ''necessarily'' related to GiantEnemyCrab, but it could be.

''Now available in the TropeCo [[TropeCo/GiantSpaceFleaFromNowhere catalog]].''



[[folder:Action Games]]
* One of the [[TropesAreNotBad actually popular cases]] is arguably Dark Link from the Water Temple in ''VideoGame/TheLegendOfZeldaOcarinaOfTime''. In the middle of a, well, water-themed dungeon with water-themed enemies, you suddenly get a room that holds a MindScrew and one of the most memorable bosses of the game.
** Shiek's cryptic lines preceding the entrance to the Water Temple make reference to the use of water to 'reflect' upon one's inner self, so in a sense, the Dark Link battle could be seen as a metaphorical battle of the spirit connected to the idea of water. It still seems to come out of nowhere and is never referenced again.
** Dark Link's original appearance as the FinalBoss of ''VideoGame/ZeldaIITheAdventureOfLink'' also may qualify, as Link already defeated the Temple Guardian. For some reason, the Triforce Keeper draws out his shadow and they must fight. Many believe it was a final test to deem Link worthy of the [[MacGuffin Triforce of Courage]], but no official explanation is given.
** Another clear example is Tentalus in ''[[VideoGame/TheLegendOfZeldaSkywardSword Skyward Sword]]''. Every prior dungeon boss had some story justification (Ghirahim was TheDragon, Moldarach was foreshadowed by {{Enemy Scan}}s of the small scorpion enemies in the dungeon, Scaldera and Koloktos were objects in the dungeon enchanted by Ghirahim) but this [[BuffySpeak giant tentacle-thing]] just inexplicably appears once you reach the boss room and tries to kill you and sink the Sandship for no reason. What makes this particularly egregious is that the MiniBoss of said dungeon had a pretty strong plot connection to the place, being the Captain of the pirates who stole the ship in the first place.
** The ghosts that abduct the cows in ''VideoGame/TheLegendOfZeldaMajorasMask''. Who are they, what are they, and why are they there all go unexplained, and they have no bearing on the plot whatsoever.
* In ''Spider-Man vs. the Kingpin'', Spider-Man fights a gorilla as a mini-boss while in Central Park looking for Sandman. Yes, a gorilla.
--> [[WebVideo/AtopTheFourthWall Linkara]]: Why is there a gorilla in Central Park?
--> [[WebVideo/TheSpoonyExperiment The Spoony One]]: And why does it hate Spider-Man so much!
** Most of the bosses in the console and PC tie-ins for the [[Film/SpiderMan film]] are either from the film or villains from Spidey canon. The one exception is the boss Spidey fights when he infiltrates [=OsCorp=], which is a HumongousMecha with a WaveMotionGun.
* The video game ''Film/TheMatrix: Path of Neo'' more or less proceeded with the plot of the three ''Matrix'' movies. Until the very end, when instead [[spoiler:all of the Smiths morphed into one giant "Mega-Smith" to fight Neo]]. Atari-esque avatars of the Wachowskis [[NoFourthWall stopped the plot]] at that point to explain how the metaphorical ending of the movies didn't translate well into a video game. This may be true, but it did feel like they were making fun of the player. ("Have fun... and enjoy enlightenment!" [Both laugh])
* Despair Embodied from ''DevilMayCry 2''. He pops out of the carcass of the previous boss without any prior in-plot mention of his existence.
* ''Super VideoGame/AdventureIsland II'' does this ''twice''. The first one appears when you beat the giant bird hyped up as the final boss. Suddenly an evil wizard appears and steals Tina, and you have to play through the level ''again''. When you kill the wizard, a ''giant space octopus'' appears, which is the ''real'' final boss. And you fight him in ''outer space'' for some inexplicable reason. There's some eerie music and mist filling the room when you kill the wizard, indicating the abrupt change in mood, which is nice, but you'd think the player deserves an explanation for this nonsense.
* From the ''VideoGame/RatchetAndClank'' series, there's the Warship (that's the only name it's given, and even then only if you leave and return) in the third game. It's a black gunship with a warp drive that shows up to make a platforming section on Daxx difficult, and is then fought as an actual boss. It's not mentioned in the dialogue (it doesn't even get a post-battle cut-scene), there's nothing else with its design or abilities in the game, and its destruction does nothing but open the path to the goal.
** Similarly, there's the Mothership in the second game. Using Giant Clank to fight Thugs-4-Less' giant robots? Makes sense. Fighting a giant UFO that launches an army of respawning UFO-headed robots? Not so much.
** The first boss of the first game qualifies too; it is never hinted at or mentioned before or after, and is pretty unexpected. While it seems to be the source of/related to similar, smaller enemies in the level, the character you meet after beating it doesn't mention it at all. The thing just kind of drops down from the ceiling.
** So, we're in [[VideoGame/RatchetAndClankUpYourArsenal Holostar Studios]], playing as Clank through a platforming section to simulate the filming of another episode of ShowWithinAShow 'Secret Agent Clank'. So far so normal, but then you're suddenly thrown into the [[UnexpectedGameplayChange only Giant Clank section in the entire game]] to fight an actually somewhat tricky bossfight... not against the ShowWithinAShow's normal villain, but a four-armed dragon and his giant robot ninja flunkies. How does this make sense?! The only lead-up is the director making mention of 'The Terror of Talos' in the cutscene before the platforming, but it still comes out of nowhere, even in-universe (or... in the universe ''inside'' of the universe), since this is the only time we're shown that Agent Clank the character can turn giant in a spy drama series that a four-armed dragon has no business being in.
* The Dark Eco Plant of ''VideoGame/JakAndDaxter''. It bears no resemblance to any other enemy and seems to have no alliance with them, while at the same time having no bearing on the plot. What's even stranger is that the entire Forbidden Jungle has holes strewn throughout with tentacles poking out that foreshadow the boss. While it appears that it'll be leading up to another great plot hatched by the Lurkers, it turns out to just be an angry flower.
* ''Immediately'' after defeating the [[SequentialBoss first]] final boss of ''{{Gungrave}}'', an "Alien Head" erupts from the ground, causing you to fall from the previous boss's arena to an entirely separate corridor, in which you fight him for the true final battle. There is no dialogue to give you any clue as to what the hell just happened, and after defeating it, you are inexplicably placed outside the structure you're in. Much like the rest of the [[TheVeryDefinitelyFinalDungeon final level]], the game [[AllThereInTheManual neglected to mention]] many key details about this being, including his non-mutated human form. Which is a shame, since he actually plays an important role in the backstory, but you wouldn't know this if you had merely played the game.
* "''{{Genji}} II'' is an action game which is [[InspiredBy based on Japanese history]]. [[http://www.pressthebuttons.com/2007/03/giant_enemy_cra.html The stages of the game will also be based on famous battles]] which took -- actually took place in ancient Japan. [[http://www.destructoid.com/behold-the-most-hater-ps3-video-possible-27094.phtml So here's]] this GiantEnemyCrab..."
* ''MetalSlug 3'''s first four-and-a-half levels are a fight against a human army (and the odd GiantEnemyCrab)... until you defeat the commander. At that point, an alien springs from his body, and the last half of the last level is a war against the invading aliens known as the Mars People. [[spoiler:There is a tip-off though. The fight is a replica of the first game's final boss, except the commander's eyepatch is on the wrong eye.]]
** The Mars People appeared first in ''Metal Slug 2'', with small, ''small'' clues in the game before they showed up, so their appearance in part 3 isn't entirely unexpected. No, the real kicker was in ''Metal Slug 6'', when ''different'' aliens show up out of nowhere and start '''eating''' the Mars People.
** Sol Dae Rokker, the boss of mission four, supposedly "an artifact of the solar deity that some Japanese believe in". But again, some of the alternative routes of the game have you fighting acid-spewing snails, zombies, man-eating plants, titanic maggots, jellyfishes bigger than your submarine, and a squadron of the Japanese Army that isn't aware that WorldWarII ended decades ago.
** The Final Boss of ''Metal Slug 5'' is another example of this trope. After fighting a terrorist cell for the whole game, your last opponent is... a giant demon. Presumably it was supposed to get more build-up, but due to the game being rushed, almost all of the plot was left out.
* ''VideoGame/CaveStory'' is solid for most of it (even the fight against a tiny superfast mushroom makes sense). Monster X and Ironhead, on the other hand, are ''literally'' out of nowhere. All the latter gives you is "Something's coming", and the former just suddenly tries to run you over once the boss music suddenly starts (and its dying cutscene is [[BigLippedAlligatorMoment even more bizarre]]). Interestingly, Ironhead is [[TheCameo pulled directly out of]] [[SwimIkachan one of the creator's earlier games.]] There's also Omega, which unlocks the sun stones in the Sand Zone, and Heavy Press nearly qualifies -- however, after beating him, it's revealed that his LoadBearingBoss nature is the only way to get to the [[TrueFinalBoss final final FINAL final boss]] chamber.
* Parodied in ''VideoGame/Stinkoman20X6''. The boss of the [[UnexpectedGameplayChange Darius-style]] level -- where all of the {{Mooks}} are generic sea-life or robots that resemble them -- is described in the manual (which initially had no picture of it) as "a small and speedy octopus or squid." (It's actually a robot gangster.)
* ''TrueCrimeStreetsOfLA'' has pretty much a whole chapter called House of Wu made of this trope. You went to investigate a Triad building. Then for no reason you fell down to the basement and fight zombies. The boss of the chapter is [[spoiler:''a huge Chinese dragon that breathes fire and swims around a lava pit'']]. Since the game is a GTA-styled WideOpenSandbox game with a standard cop-show material with no supernatural or weird stuff in it outside of that chapter, many consider it to be entirely out of place. The developers admitted this level was pretty much TheArtifact of a prior build and apologized.
** To a lesser extent, the fire-breathing opera boat from the sequel.
* ''VideoGame/{{Klonoa}} 2: Dream Champ Tournament'', as its title suggests, revolves around a tournament. However, the boss stages don't involve actually fighting the other competitors; instead, you have to race them, with your opponents acting like [[TimedMission time limits]] and not otherwise showing up in the gameplay. The actual bosses of the game are just random creatures who appear on the track.
* ''VideoGame/NinjaGaiden II'' (2009) has one at the end of chapter seven. You've just finished dueling a boss who has a prominent part in the storyline, then the plane you are on crashes in the Arctic (or somewhere icy anyway) and a ''giant ankylosaurus made of molten rock'' appears out of the ground to fight you. To add insult to injury, when you defeat the boss, it will explode in what seems to be a {{cutscene}}... but is an actual explosion which will kill you if you're caught in it. And the only way to not die from the explosion is to hold the block button. This basically guarantees that players will die at least once from it.
** It's actually a part of the ship, presumably the main core. However, you likely won't hear the references to it on the ship unless you have the subtitles turned on, and the scene of it emerging from the wrecked ship is so blink-and-you-miss-it quick that most players assume that it just came out of the ground. So, it still qualifies.
* After you defeat the BigBad in the arcade version of ''{{Astyanax}}'', who is a ShoutOut to Emperor Palpatine from ''StarWars'', complete with "force lightning", you suddenly find yourself in the true final stage, which is a technorganic alien hive complete with eggs and face-huggers. At the end, of course, is the "Queen Alien", which obviously looks like a Xenomorph from the ''Alien'' movies. Space Flea Hive Level From Nowhere?
** The same thing happened in virtually every game in the ''Turrican'' series. The penultimate or final level would always be a Xenomorph hive straight out of ''Aliens'', complete with face-huggers aplenty. Needless to say, Xenomorphs have nothing to do with the plot of any game of the series.
* ''VideoGame/CastleCrashers'' also does this in the final level. As far as the bosses of TheVeryDefinitelyFinalDungeon go, [[spoiler:although the Necromancer and re-animated Cyclops were seen in the game previously, the burly painter with a lunchbox for a head who attacks by painting monsters that were ripped straight from {{Newgrounds}} was not.]]
* The Sega Mega Drive game ''AlienSoldier'' ''is'' this trope. Nearly every enemy (enemy in this case being equivalent to [[BossRush a boss in every other game]]) is unexplained save for a few, usually ungodly powerful, and progressively stranger (giant crabs in an airport, for example). You cannot go longer than a minute or two without running into something giant, random, and unexplained.
** The one that takes the cake is "[[WordSaladTitle Wolfgunblood]] [[http://www.bogleech.com/aliensoldier/as-horseman.gif Garopa]]". It's a [[NinjaPirateZombieRobot cyborg cowboy wolf]] with a [[MoreDakka machine-gun]] ArmCannon that rides on a MechanicalHorse. No explanation is given on why it's there.
* ''TheGuardianLegend''[='=]s FinalBoss, "It", appears out of nowhere in outer space after the Naju planetoid has been destroyed. Other out-of-place bosses are the "glider", which is actually an enemy from ''Zanac'', and Teramute, a ''dragon'' that is only encountered in one corridor of the Forest area.
* ''Franchise/{{Castlevania}}''
** The final boss in ''VideoGame/CastlevaniaDawnOfSorrow'' qualifies, since no one expected [[spoiler:it to burst out of Dmitri's body as a fusion of all the demons he dominated]].
** ''VideoGame/CastlevaniaLordsOfShadow'' has the final boss turn out to be [[spoiler:{{Satan}}]].
** After all the strife and struggle of reaching the end of ''VideoGame/CastlevaniaJudgment'', the player finally faces the mastermind behind the events of the game... [[spoiler:The Time Reaper]]. Granted, he reveals that a villain from ''VideoGame/KidDracula'', [[spoiler:Galamoth]], had sent him from [[spoiler:[[{{Disney/Aladdin}} TEN THOUSAND YEARS]] in the future]] to the past to alter history and make him replace Dracula as the Dark Lord, but, as [[Creator/TheQuarterGuy The Quarter Guy]] stated in his countdown video for his 15 favorite ''Castlevania'' bosses, there was no buildup to his identity other than he was messing with the timeline, and after he is defeated, he is never brought up again (QG even considered it a BigLippedAlligatorMoment).
* In ''{{Contra}}: Shattered Soldier'', the TrueFinalBoss, the Relic of Moirai, is one. Supposedly, he's some ancient EldritchAbomination [[SealedEvilInACan in a Can]], and while it comes out of nowhere at the last second, the whole reason the aliens have been attacking Earth for years was because they are Jovians and we took the relic from them (and the shadowy conspiracy government covered it all up). They were just trying to get it back.
** In ''Super C'', the FinalBoss is a weird techno-organic GiantSpider with a woman's face (nameless in the US version, but called Shadow Beast Kimkoh in Japan) that shoots small spiders at you. This enemy appears as a MiniBoss in later games.
** The TrueFinalBoss of ''[=ReBirth=]'' also qualifies. What is that thing? It looks like an organic ball that attacks you by throwing garbage and debris at you.
*** [[spoiler:However, it is not completely from out of nowhere. It may be composed of debris of Project C from ''Neo Contra''.]]
* ''VideoGame/MetroidOtherM'' includes a bolt-from-the-blue BonusBoss of the epilogue chapter, Phantoon. Why he's fought, how he's alive again after being defeated in ''VideoGame/SuperMetroid'', and what he had to do with anything on the Bottle Ship is never ever explained. For a game notorious for its long, redundant expository monologues, it's ironic that it clams up during one of the few times an explanation is actually needed.
* Some of the bosses in the ''Franchise/ResidentEvil'' series qualify:
** The first Garrador (Blind Slasher) in ''VideoGame/ResidentEvil4'' is a little out-of-nowhere as well. While the other three are there as part of ambushes, the first is randomly imprisoned in a basement just to give a short boss fight before you can pull the lever to get through the hallway upstairs. [[FridgeLogic Which also raises a number of questions about what the Ganados expect to do to get through that hallway.]] [[InsurmountableWaistHighFence Besides squeezing or climbing over the statues spewing the fire.]]
** The odd insect-like boss that attacks in Chapter 5 counts, too, since none of the reports seem to hint at it. The game doesn't even give you its real name [[AllThereInTheManual (U3, if you're wondering).]]
*** Although Saddler does call you up and TELL YOU that he's about to introduce to you to "it". That's about as much foreshadowing as Del Lago and El Gigante got.
** In ''VideoGame/ResidentEvil3Nemesis'', the primary boss is, well [[ExactlyWhatItSaysOnTheTin Nemesis]]. However, twice ingame, you are attacked by Gravedigger, a {{Tremors}}-esque giant worm, which showed up with zero fanfare the first time you fought it.
*** Nemesis himself might even count here. His specific origins have never been explained in any canon medium, which is weird because just about every other creature Umbrella has created has some kind of documentation or a plot point revealing what it used to be or how it was created. The closest thing Nemesis has to an explanation is that it's a Tyrant imbued with an NE-T parasite developed by Umbrella's French division. Interestingly, Nemesis does get an origin story in the related film series.
*** ''VideoGame/ResidentEvilCodeVeronica'' has a similar giant worm, and fighting it is optional. [[spoiler:The first time.]]
** In ''VideoGame/ResidentEvil5'', why exactly was Wesker keeping a GiantEnemyCrab in the giant rotating elevator of his underground base?
** The giant scorpion on the train in ''VideoGame/ResidentEvil0''.
*** To be fair, though, the Scorpion is at least ''mentioned'' in a file before it arrived. How it got on the train is, of course, bizarre. But the real "say what?" boss is the Centurion Centipede, who comes out of a grate because it's a nice time for a boss fight with no previous mention.
** ''VideoGame/ResidentEvil2'' gives us a giant mutant crocodile that is fought in the sewers. It has no foreshadowing at all and due to the limitations of the Playstation graphics, the crocodile looks more like a normal croc that just grew huge. ''VideoGame/ResidentEvilTheDarksideChronicles'' gives the mutant croc a makeover and it looks more like a zombie crocodile, but it still retains no foreshadowing.
* ''VideoGame/StarFox1 '' has an alternate FinalBoss that is completely random. After going through a secret level that made NO sense, you fight [[spoiler:a Slot Machine that can only be beaten by getting Triple 7s on it.]]
* Pretty much every single boss in ''VideoGame/GunstarHeroes'' and its sequel embodies this trope. Case in point: the board game level, which features a giant face named Melon Bread, a bunch of little slime men that swarm you and only have 1 HP each, a giant gumdrop that summons clones that explode for no reason, and a teddy bear that can be defeated by being run over by a car. I'd list more, but the sheer number alone would hurt my brain.
* Blues/Proto Man's first appearance in ''VideoGame/MegaMan3'' qualifies. He made sense later on, but that first time, he was just kinda... ''there''.
** There's also Doc Robot using the powers of the Robot Masters from ''VideoGame/MegaMan2'' after you beat the initial eight. There's no explanation for what he's even doing there in the first place, nor do we ever really get one.
** Sunstar from ''VideoGame/MegaManV'' is very out-of-nowhere. After spending most of the game with the Stardroids as the BigBad, then having it be [[HijackedByGanon Wily behind it all]], it's very bizarre to have the FinalBoss be a doomsday weapon never even hinted at throughout the game and with no reason to be there ([[AllThereInTheManual unless you read some books saying Wily found him alongside the Stardroids]]).
* ''MuramasaTheDemonBlade'' features a giant centipede attacking a building. Granted, it's actually a creature from the Japanese Mythology (the Oomukade if you want to know), but the story at that point indicated you were about to face off against a human antagonist instead.
* In ''VideoGame/DeadSpace'', the bosses are usually given some sort of buildup; you find Doctor Mercer's notes on the creation of the [[ImplacableMan Hunter]] before you actually fight it (and after you freeze it, Mercer will start to show up again shortly before the Hunter thaws), you spend an entire level trying to make a poison to kill the Leviathan ([[ButThouMust but it doesn't work so you just have to shoot it a bunch of times]]), and the HiveMind is alluded to several chapters prior to fighting it. However, the Slug is given zero foreshadowing. You get "Isaac, there's something blocking our communications" and have to man a giant gun in order to knock it off the antenna.
** It only comes out of nowhere if, while repairing the antenna, you failed to look up at the giant grate that covers it and see all the necromorph flesh on the other side.
*** VideoGame/DeadSpace2 gives us [[http://deadspace.wikia.com/wiki/The_Tormenter The Tormenter]] which just sorta turns up after Isaac falls though the ceiling (Isaac had spent the last two and a half levels running from a human gunship).
* In ''VideoGame/PrinnyCanIReallyBeTheHero'', once you reach the Flavor Sage and everything suddenly seems to be going smoothly, the aforementioned Flavor Sage commands the random giant padlock behind him to turn into the Chefbot-9000 and attack the prinny in order to make the Ultra Dessert. The lead character even lampshades how incredibly random this is.
--> '''Prinny''': Nine thousand?! Why does this thing even exist?!?!
* ''Run Like Hell'' for the Xbox had a problem with this, where you will face off against [[spoiler:Niles just after Nick sets the reactor to explode]], but after this awesome battle, you face off against a weak spider-like member of the race as the last boss which is nowhere near as lethal or as bad as the last boss you faced, and he just sort of appears out of nowhere as if they weren't sure what to do for a final boss. To be fair, the series was ended on game one and it was intended to be a trilogy.
* Pretty much every boss in ''VideoGame/SuperStarWars'' is a Giant Space Flea From Nowhere, including the Jawas' lava monster, a giant womp rat, and a mech in the Death Star.
** Super Empire Strikes Back was somewhat good about bosses making sense (giant probe droids aside), but then Super Return of the Jedi includes a boss fight with EV9D9 (Jabba's torture droid) in an Ewok Village, and a green fire-breathing tiger thing.
* ''VideoGame/GodOfWar 3'' has you battling in various boss fights against gods, mythic characters, and even [[spoiler:a Titan]]. After the last boss in the previous sentence, the next boss is[[spoiler:... a giant scorpion who happens to live in the area you're exploring.]] True, it's hinted at by a newly appeared enemy type that hasn't been seen before and some notes on the ground in the area, and said boss is carrying an artifact you need to progress... but after all the epic previous battles, it seems a step down.
* ''[[TwistedMetal Twisted Metal Black]]'' combines this with a subversion of TheGuardsMustBeCrazy. The FinalBoss is a military helicopter that shows up to end your rampage.
* A notable subversion in ''KirbySuperStar'': The final bosses of ''Milky Way Wishes'' are this unless the player watched its introduction sequence. However, in the original SuperNintendo version of KirbySuperStar, the introduction sequence was both optional and [[GuideDangIt not indicated to even exist]], meaning many players probably wondered what was going on at the end of the game. This was corrected in the [[VideoGameRemake DS remake]], where the introduction was automatically played.
* It's explained that ''VideoGame/{{Bayonetta}}'' and her entire clan of Umbra Witches are often accosted by Angels who their Demon contractors would love as sacrifices, and the whole game takes place during what can be seen as an entire ''revolution'' for the angels, so at no point can an angel appearing to fight Bayonetta be strange. The real Space Flea from nowhere is the one enemy of the game that ''isn't'' an angel... It's a machine. The Occult Device: The Golem. It's not mentioned at any point in the story, and its backstory explains that it was created by both the Lumen ''and'' Umbra clans. Because the weapon was built by Witches and Sages, it makes it even stranger, still, that it appears in Paradiso, the world of the Angels, of all places. It's just... there. Slamming itself into random walls throughout the level and eventually fighting Bayonetta properly at the end, but it gets no mention in the plot, and the controller of this device [[spoiler:or of the one that appears in [[VeryDefiniteFinalDungeon A Tower To Truth]]]] is never revealed.
* The Rogons in ''EvoSearchForEden'' are a race of intelligent fish who are harming the whales, and the player is tasked with taking them down. Absolutely none of this is foreshadowed in any way, nor do the Rogons have any relevance to the rest of the game.
* In the Japanese Famicom version of StarWars, you run into Darth Vader a ''lot'' in the game. He shows up very early on, starting in the Sandcrawler for some reason. When you hit him, he turns into a scorpion. This actually happens throughout the game, and Darth Vader will transform into different creatures depending on the level. The ''real'' Darth Vader is actually fought twice.
* In the relatively down-to-earth ''Franchise/JamesBond'' game ''VideoGame/EverythingOrNothing'', one of the early levels ends with Bond in a helicopter attacking a hidden base that rises out of the Nile that wouldn't look out of place in a ''StarWars'' game. Never gets mentioned again.
* The PC game for ''[[VideoGame/HarryPotter Harry Potter and the Sorcerer's Stone]]'' has Harry escaping from the astronomy tower, pursued by Filch, to a Quiddtich game, and then randomly under the trap door -- leading to the final battle with Voldemort. The game skips about half of the book and movie.
* ''Treasures of the Deep'' has a level titled [[IncrediblyLamePun "Montezuma's Revenge"]], where you explore the underwater ruins of a Aztec Temple to find two pieces of Montezuma's lost treasure. After getting the first treasure, entering the room with the second brings you up close and personal with [[spoiler:a giant reptilian monster with webbed underarms]]. The worst you faced up until this point were some angry crocodiles and booby traps.
* ComicJumper has Benny, a walking, talking ''Film/TotalRecall1990'' reference (complete with giant drill machine) show up in the last Silver Age level, followed by the giant photorealistic head of a Japanese kid in the first manga level.
* ''Anime/AfroSamurai'' the game has a few of these. On the Bridge level, the player finds themselves taking on several mini-bosses directly out of left field, with most of them immediately followed with an IndyEscape over a collapsing bridge. The first is an overconfident Big Mook who you later see mass-produced with a few standard mooks. The second is a band of 5 samurai aptly dubbed 'The Wild Five', who are troublesome but easily dealt with. And the last and most ludicrous is explosively introduced as Afro walks away from the fight with the Wild Five with no warning what-so-ever. A flying robot (that looks akin to FLCL's Canti) smashes through the bridge beneath Afro's feet and pulls him into the sky for a midair-freefall-boss-fight of {{Badass}} proportions. The player's navi guide in the shape of Afro Samurai's Ninja Ninja (Creator/SamuelLJackson) even presses the unexpectedness further by turning to the player (camera) and saying just how unexpected it was. "Did you just see that sh**?!... You go keep an eye on that fool, I'm gonna go get some coffee."
* In ''VideoGame/{{Psychonauts}}'', the StepfordSuburbia of the Milkman Conspiracy is suddenly interrupted at two points where demons called Nightmares pop out of the ground and drag you to a [[PlanetHeck a stage full of fire and darkness.]] [[WhatCouldHaveBeen They were originally going to be part of Milla's mental world]], but were moved because it didn't make sense for a boss fight then either.
** They ''are'' in Milla's mental world as well, she just keeps hers locked up in an out-of-the-way area.
*** It has lead some the theorize [[spoiler: that it was [[EpilepticTrees the Milkman who burned down the orphanage.]]]]
* Played straight and then lampshaded in ''VideoGame/KidIcarusUprising''. At the end of Chapter 8, Pit prepares to take on the captain of the Space Pirates in order to retrieve the three Sacred Treasures he used to defeat Medusa in the first game, when suddenly a giant [[KrakenAndLeviathan Kraken]] leaps out of nowhere and [[BaitAndSwitchBoss eats him]].
-->'''Palutena:''' "A Space Kraken?! Well that came out of nowhere!"
* In ''DeadToRights'', at the end of the warehouse level, Jack Slate finds the guy he was chasing (Gopher) killed, and the person who killed him is... some random hulking dude with a crossbow called Longshoreman X who you then fight in a boss battle; this guy has zero build-up, and there's no mention afterwards as to who he was or why he killed Gopher.
* ''VideoGame/MetalGearRisingRevengeance'' has the Metal Gear EXCELSUS, piloted by Senator Armstrong. Even more-so is [[spoiler:Armstrong himself, who afterwards bulks up and induces TheWorfEffect upon Raiden]]. Even the Mission Control is shocked, since if you talk to Kevin beforehand, he'll note that [[spoiler:there's nothing they dug up on Armstrong that could have suggested that he was in any form a physical threat (aside from the fact that he was in the Navy but didn't see any action)]].
* The final boss of ''JourneyToSilius'' is an oversized {{Terminator}} endoskeleton; a holdover from the game starting development as a LicensedGame in that franchise.
* As seen in the page quote, Trypticon from TransformersConvoyNoNazo isn't quite an example, but the game ''does'' still have an example in the form of a giant Decepticon logo that's fought more than once throughout the game.
* In the second ''Film/TheBlairWitchProject'' game, ''The Legend of Coffin Rock'', the final boss is something which looks like a cross between a lizard and a bull, and named "Schnell Geist". The only foreshadowing for this is one book in the library near the beginning of the game which describes a local folklore creature called "Snallygaster". Those are different names for the same thing, although the game never gives you that connection. It actually comes from real folklore for the Maryland region.
* ''VideoGame/AngryVideoGameNerdAdventures'' has an unexpected appearance by TheGiantClaw, which the Nerd had never mentioned in his prior videos.
** "The Giant Claw" was part of his "Monster Madness" Series of Horror Movie Reviews. But nonetheless, it wasn't from his video game reviews, but movie ones.
* The arcade classic ''VideoGame/{{NARC}}'' has you fighting human criminals (though outlandish ones) and attack dogs through the entire game. Then you fight the final boss, Mr. Big, who is a disembodied big giant head sliding around on some sort of high-tech pedestal. Damaging him first causes his sunglasses to break off, which will allow him to shoot fire from his eyes. More damage will turn him into a skull slithering around at the end of a tentacle-like spine, spraying you with an endless supply of detached tongues.
* Some of the {{True Final Boss}}es of ''VideoGame/TheBindingOfIsaac'' fall into this category. While the final fight against Mom makes sense, as does [[spoiler: Mom's Heart in The Womb to an extent]], the latter is eventually replaced by [[spoiler: It Lives]], which makes less sense. The Halloween update adds Sheol and [[spoiler: Satan]], which make some degree of sense, but then ''Wrath of the Lamb'' adds two more space fleas: [[spoiler: Isaac himself and JokeCharacter [[MyNameIsQuestionMarks ???]]]]
** The first new FinalBoss of ''[[UpdatedRerelease Rebirth]]'' is a space flea as well. Apparently the next logical step after fighting [[spoiler: Satan]] is to fight [[spoiler: The Lamb, some random demon found in the Dark Room.]]

[[folder:Role-Playing Games]]
* The ''Franchise/FinalFantasy'' series has a bunch of them.
** ''VideoGame/FinalFantasyIII'' contains a prototype for these types of enemies in Cloud Of Darkness, a barely-explained cosmic force who pops quite literally out of nowhere to fight you after you beat BigBad Xande.
** ''VideoGame/FinalFantasyIV'' ups the ante with Zeromus, its final boss. He had only a vague connection to the plot, being the hatred of the main villain given form, and seemed to be present largely to provide a massive, intimidating final boss -- which Zemus [[TheManBehindTheCurtain very much wasn't.]]
*** Calcabrina, the living dolls, though the sequel, ''VideoGame/FinalFantasyIVTheAfterYears'', not only ties them into the plot, they even become playable.
*** There's also Lugae. Halfway up a tower which you already know contains a boss you'll have to fight, you run into a guy in a lab coat with Einstein hair, who fights alongside an '80s Frankenstein's monster and then turns himself into a gangly zombie. And apparently survives both battles.
** Ultros from ''VideoGame/FinalFantasyVI'', the most amusing Space Flea ever. He's a giant purple octopus who comes out of nowhere and attacks you (in the [[{{Woolseyism}} Super Nintendo translation]], he claimed to want to eat your party, which was at least ''some'' sort of motivation, but this wasn't in the original Japanese, nor the Game Boy Advance version, where he just attacks you and that's that). When you give him a beating, he escapes and later comes back to wreck the opera you're attending, along with other situations, for revenge. It's even funnier if you pick Gau and Cyan to go to the opera house. Why? Because this means your party is made up of members Ultros has never met before, and thus he's plotting "revenge" against a pack of total strangers.
*** He makes a cameo as a boss in ''The After Years'', and the collective reaction of the party is something along the lines of "what the hell was that about?"
*** Ultros also makes an apparition in ''VideoGame/FinalFantasyXIV''. Apparently, the thaumaturges of Ul'dah summoned him to their world by mistake. At least his role in the plot gets some build up, as he needs to work at the coliseum in order to repay the heavy debt he piled up by drinking at the local bar. Aside from that, citizens of Ul'dah seems to be unfazed to see a purple pervert octopus [[MoreTeethThanTheOsmondFamily with a lot of teeth]] in their city.
** Atma/Ultima Weapon also fits this trope. He's the boss of the DiscOneFinalDungeon, and enters battle delivering a BadassBoast about how ancient and powerful he is while a new, more foreboding boss theme begins to play. Aside from an off-hand mention from a single random NPC much earlier in the game, he's never mentioned beforehand and the party doesn't give him any thought afterward.
** Siegfried/Ziegfried. He is a joke boss on the Phantom Train, also appearing in [=WoR=] Cave of Figaro and the Coliseum, who has no relevance to the story whatsoever. He is a "legendary" thief who has some relation to Ultros (this is not explained in detail), but despite being "legendary", the only two characters that mention him are himself and Ultros. It is probable that the version on the Phantom Train is actually an impostor, but this just adds to the randomness.
** Arguably the most (in)famous example is Necron in ''VideoGame/FinalFantasyIX'', predominantly because he is also a ''final'' boss who appears suddenly and has no prior lead-up within the context of the storyline. Fans have come up with many EpilepticTrees concerning his relevance and existence, but nothing definitive is ever provided, and his existence is not even mentioned during the ending sequence. Even worse, he directly followed Kuja, a ''legitimate'' BigBad and one of the more popular villains in the series. One is left wondering if the designers wouldn't have been better off making Kuja a SequentialBoss.
*** WordOfGod says that Necron was a "thematic" final boss, acting to fight Zidane's desire to live with a being who represented total death (as opposed to Kuja, who was pretty much just deluded). The writers never even tried to tie him into the plot, though, stating he "could have" been several things. In the Japanese version, Necron's name is "The Eternal Darkness" when directly translated, making it clear that he isn't meant to be a character at all, but just a thematic force of nature.
** While we can't very well say that ''all'' the [[BonusBoss Notorious Monsters]] in ''VideoGame/FinalFantasyXI'' fit here, as most aren't part of a storyline, and others are actually mentioned before you meet them, there's not much mention of ''[[http://wiki.ffxiclopedia.org/wiki/Snoll_Tzar a giant angry snowball the size of a van with teeth]]''. Most of them are at least thematically consistent with the areas they come from, though.
*** Worth mentioning are two of the three main [[BonusBoss optional Mega Bosses]] (Kirin and the Pandemonium Warden, although the former's not so mega these days) who are thematically inappropriate with the areas they appear in (especially Kirin). Along with Absolute Virtue, there is dialogue indicating vague backgrounds with no real relevance to any of the game's overarching plots.
** On a less-major level, several minor bosses throughout the series are just random monsters that turn up and fight you for no real reason, to ensure you are levelled properly.
*** The most infamous of those is probably FFVII's Schizo, a strange two-headed dragon who showed up ''immediately before another (actually plot relevant) boss fight,'' just to prove it wasn't even there for level structure reasons. It was just kinda there.
*** There's also the Red Dragon in the Temple of the Ancients. First, Sephiroth reveals his master plan to become one with the Planet. He flies off, then suddenly, the room that this took place in starts shaking and the lights begin to dim. Cloud wonders if this is Sephiroth's doing, but the latter says it's not him. It was actually the Red Dragon that got absolutely no prior build-up, at all. When you defeat it, Cloud immediately asks where Sephiroth went and the Red Dragon is ''never'' brought up again.
** Several bosses in ''VideoGame/DissidiaFinalFantasy'' have no plot reasons for their encounter with the heroes, they just appear and decide to challenge you. The Warrior of Light's battles with Garland, Ultimecia, and the Emperor are the most prevelant; he's searching for his Crystal, the enemy appears and taunts him, he replies ShutUpHannibal and they fight.
** ''VideoGame/FinalFantasyXIII'' has possibly the most literal example out there: at one point, the party must fight an improbably huge robot bug that has somehow appeared on the satellite you're on. No explanation is ever given for what it's doing there.
* ''VideoGame/DragonQuestII'' had one of the earliest examples of the Giant Space Flea from Nowhere final boss. After defeating the BigBad of the game, Sidoh (Malroth in the American version), who he turned out to serve and worship, appears out of nowhere to be the final boss. This was particularly nasty in the US version, as absolutely ''nothing'' hinted at his presence aside from a minor quest item named "Eye of Malroth", and he is infinitely harder than the game's BigBad, Hargon, mostly because he randomly casts Healall to set his life back to full whenever he feels like it.
** ''VideoGame/DragonQuest'' in general is ''terrible'' about doing this to the ''final boss of the game''. Even the very first one, the original text had the Dragonlord's pet superdragon come out of nowhere after you beat him (although the first translation [[{{Woolseyism}} changed this to his]] [[OneWingedAngel "true form"]] to help make the fight climactic and continuous.)
** Deathtamoor of ''[[VideoGame/DragonQuestVI DQVI]]'' gets namedropped pretty late in the game, as well, with his evil being pretty much OffstageVillainy, via his minions.
*** Not that Dragon Quest VIII is without them, though. Megalodon and Ruin (from when you're trying to escape [[spoiler:The Black Citadel]]) both fit this trope pretty well.
*** And VII is not without its Giant Space Fleas From Nowhere (although you're generally dealing with the effects of said Space Fleas); it's just that the (plot relevant) final boss is set up from the very beginning of the game. There are two {{Bonus Dungeon}}s, with {{Bonus Boss}}es, but they're, well, bonus dungeons.
** DragonQuestV: Bjorn the Behemoose can appear to be one (emphasis on the Giant, he's the size of a mountain and is fought from the top of a tower) via accidental SequenceBreaking, as the key he drops is needed for the final dungeon but he can be fought just after three-fourths of the way in the game.
* Happens in the original ''StarOcean'', after a VictoryFakeout no less. Just when you think you've saved the day, all of a sudden, there's this Jie Revorse jackass to deal with, and there's absolutely no lead-up into this. The PSP rerelease at least has a minor rewrite in order to link him to the main plot. This was one of many unfortunate side effects of half the game being DummiedOut for space reasons.
** The third game features literal Giant Space Fleas, literally from Nowhere, which invalidate entirely almost everything that happens previous to their arrival. Not a technical example of the trope since the entire second half of the game involves dealing with them, but considering the profound implications their arrival has on the ''entire series'', the fact that they happen with absolutely no warning has gone so far as to [[BrokenBase break the base]].
* In ''VideoGame/{{SaGa Frontier}}'', Emelia's final boss is an actual gigantic Mecha Shiva that drops down from the roof of the church where Emelia is pretending to have a wedding ceremony with the party in lieu of her dead boyfriend. WordOfGod explicitly states that there's no relationship at all between this creature and the BigBad. It seems to exist solely to provide a final boss to the character arc.
* {{Discussed|Trope}} in the elaborate StrategyGuide for the remakes of both ''{{Lunar}}'' games. The developers chose to remove several Giant Space Fleas that could distract from the main narrative. Of course, the remakes put a lot more emphasis on some of the baddies that ''did'' make sense.
* ''VideoGame/SkiesOfArcadia'' has quite a few of these. An overweight, acid-spewing rabbit, a giant robotic penguin with a death-ray, a floating tortoise that could make itself invincible, and a cockatrice-esque giant bird all appeared suddenly, were dispatched by the heroes, and died without comment from anyone.
** There was a gigantic green blob in the game's sewer level (the aforementioned "acid-spewing rabbit"). What made him twice as bad was that not only does he come from nowhere, but after beating him, you ''immediately'' have to fight a boss that IS related to the story. That sequence sticks is one of the toughest parts of the entire game, partially because it happens so early and your healing options are very limited.
*** The Bleigock (the aforementioned "gigantic green blob") was likely there (placed by Valua, or more likely just because it was hungry) to eat the bodies that were dumped through the hole that Vyse is trying to enter the Coliseum through. The other mentioned creatures were bosses guarding the Moon Crystals (by coincidence or ancient design), which would be an understandable security measure to add.
* ''VideoGame/MarioAndLuigiSuperstarSaga'' has a couple:
** Trunkle, a rock-tree-creature who suddenly appears at the end of the desert section to menace the princess for a distinctly nonspecific reason. If you go to that area before Peach is with you, Trunkle will be sleeping there; you can infer she woke him up and he got angry.
** Before Trunkle, there's a part of the game where you save the queen by having her drink a legendary soda. The main boss of that section... [[WidgetSeries is the soda. The guy who created it made it able to defend itself.]] No one mentions this again.
* ''VideoGame/MarioAndLuigiDreamTeam'' has a couple of these:
** Mammoshka. You never know there's a powerful guardian on Mount Pajamaja unless you speak to one of the trapped Pi'illos on the mountain, otherwise you won't until you literally see it in the cut scene just before the fight. It's supposedly legendary... but no one ever mentions it except for said Pi'illo and the Massifs about 30 seconds before the battle.
** Earthwake. One minute you're walking through Dreamy Wakeport trying to free the Bedsmith from some Nightmare Orbs, next minute that Pi'illo Collector guy appears and warns you of a terrible guardian that attacks anyone who hits the nearby ! block (and you see a save block nearby). And even after hearing this, you most likely don't expect the building you're standing on to fly into the air, an alarm klaxon to sound, and a HumongousMecha made of buildings from the background to form and try to kill the Mario Bros.
** Pi'illodium. You don't know about this ancient Pi'illo security system until it literally appears and someone asks what it is.
* On the whole, ''VideoGame/SuperMarioRPG: Legend of the Seven Stars'' is pretty good about making sure all its bosses are either connected to the plot in some way or at the very least foreshadowed. However, nothing whatsoever explains what happens when you [[SpeakNowOrForeverHoldYourPeace break up the Princess's wedding to a minor villain]]: The chefs who prepared the wedding cake get upset that their work will be unappreciated, so they attack you. Then, the wedding cake inexplicably comes to life and uses its inexplicably vast magical powers to try and kill you for some inexplicable reason.
* ''VideoGame/PaperMario'' series:
** Smorg from ''VideoGame/PaperMarioTheThousandYearDoor''. While its individual components do appear in one room in an abandoned train station where [[CreateYourOwnVillain you bashed them in the face to get to a switch]], it gave no indication that they would be able to amass together to create some giant animal made out of sentient balls of lint. The only apparent reason it exists is to give the chapter a boss fight that isn't [[spoiler:Doopliss]].
** There are also the three giant Bloopers in the first Paper Mario. They serve no purpose in the game's story, and just appear without warning while you're exploring the sewers under Toad Town screaming "BLOOPER!" in huge text, and are not mentioned by anyone before or after fighting them. Although, by the time you see the Super Blooper (the third one), the shock has all but worn off.
** There's also Kent C. Koopa, who you encounter on Pleasant Path. He literally shows up from out of nowhere to block your path for no good reason. You can either fight him or pay him a temporary toll, and it is absolutely necessary to use the path, so... (Actually, there's a sign in the Mushroom Kingdom that foreshadows his existence. Make sure to read both sides of it each chapter).
* {{Lampshaded}} in ''{{Suikoden}}'', where encountering a random boss enemy that is not referenced before or after causes one character to exclaim something along the lines of "What the hell!?" before the fight. It's also played straight with a few other encounters.
** In ''SuikodenIV'', at the climax of the game, you fight [[spoiler:a [[WhenTreesAttack Giant Space]] ''[[WhenTreesAttack Tree]]'' [[WhenTreesAttack From Nowhere]]. [[ItMakesSenseInContext It's actually explained]] in the game's {{Backstory}} -- and [[SuikodenTactics the sequel]] clears things up for those who didn't piece things together on their own -- but still, it's very much a [[BigLippedAlligatorMoment WTF moment]] at the time.]]
** Almost every boss that isn't a human character in ''SuikodenV'' falls into this category. [[spoiler:Even the ''final'' boss of the game, the Sun Rune incarnation, shows up and then dies without a single mention before or after. At no point does the Queen mention that the Sun Rune can do that, none of the villains mention that that's who they're trying to awaken or that that's their ultimate plan... The BigBad just disappears into a cloud of dust right before the battle and '''QUICK BOSS TIME GO'''.]]
* [[Disney/{{Fantasia}} Chernabog]] from ''KingdomHearts''. He literally appears out of nowhere, after you've jumped through the hole in "The End of the World". You don't know who he is, Sora makes no comment about him whatsoever, it's never explained if he's a Heartless, what connection he's got to Xehanort or ''why'' he's even there, he's the only boss who doesn't get an entry in Jiminy Cricket's journal, and he's never mentioned again. It's as though the developers just thought it would be a disservice not to include one of the most impressive Disney creations, even if they had to just drop it in without so much as a single word of context. It's just plain RuleOfCool (and copious RuleOfScary).
** In [[Disney/{{Fantasia}} his original appearance]], Chernabog isn't really given a backstory either. The ''Night on Bald Mountain'' begins with him turning out to be the top of a mountain and proceeding to terrorize a nearby village in some pretty frightening scenes. Therefore, he could perhaps be considered a Giant Space Flea From Nowhere in Fantasia as well.
** There's a brief reference to Bald Mountain... in Traverse Town. Which you may never actually notice. And which makes no actual reference to giant demons.
** Apparently, when they were asked about him being in the game, the devs stated that Chernabog was originally going to be the final boss, as he was supposed to be the source of all of the Heartless. Unfortunately, having a Sephiroth proxy seemed cooler, so Ansem's battles were put in. That's why they're so relatively easy compared to his battle.
*** Note that Chernabog apppears as Sora is traveling through the "Dark Paths" that the Heartless use to get from world to world. Each gate Sora travels is a different color depending on if that world's keyhole is locked or not, or if the Heartless never visited (Hundred Acre Woods). Chernabog's is red, implying this is a world that fell to darkness ([[VideoGame/KingdomHearts3DDreamDropDistance which was since confirmed]]). Chernabog may just be the Heartless of an entire world.
* ''The Granstream Saga'' produces a boss from nowhere. ([[spoiler:But also manages to tie it into the plot while simultaneously nullifying the rest of the point of the game]].) You've happily completed the game's quest across four floating continents to save them from falling into the sea. ([[spoiler:Then you're sucked into a black hole where someone named Demaar tells you that the whole world was an illusion and that you have to fight him to break a hundreds-of-years-long cycle.]]) To call it out of nowhere would be something of an understatement.
* In ''VideoGame/JadeEmpire'', the obstruction of the spirit world at Dirge allowed a being of pure darkness from outside the human and spirit worlds to arrive, which the player must defeat. There is little explanation of what it is or where it comes from, it simply is.
* Nearly every boss in ''VideoGame/{{Mother 3}}''. Notable ones include Master Eddy, an animate whirlpool you fight near Tanetane Island, and the Forlorn Junk Heap, a discarded clayman reinforced with scrap metal. Of course, [[WhatDoYouMeanItWasntMadeOnDrugs considering what kind of]] [[MindScrew game this is]], you really can't complain about weirdness.
* ''VideoGame/ChronoCross'' and the Time Devourer. Sure, Lavos is mentioned a couple times in passing ''if'' you go out of your way to read side documents near the end. Schala isn't. But the game already gave two 'final' bosses before this, one at the end of a long dungeon and the prior requiring a long attunement and the entire game having built up to it. But then you fight this giant space-eating glowing thing that merged with Schala somehow and defeat it with ThePowerOfRock? What the hell? Dropping Magus in would have made about as much sense. Hell, Chrono, Marle, and a zombie Lucca would have made about as much sense. And what was with Miguel? ''Why was he a superpowered philosophical fisherman?''
** Most of the bosses in ''VideoGame/ChronoCross'' fall into this category, really. Generally there's a thematic link between boss and area they're fought in, but pretty much any fight that's not preceded by a story scene exists solely to give the player another star level.
* The roaming legendaries in ''Franchise/{{Pokemon}}'', once unlocked, can be found absolutely anywhere in the world and change location at random. You're just sitting there, training up your Golbat, when -- HOLY CRAP! A RAIKOU!
** The second generation actually did set up the (original) roaming legendaries of Raikou, Suicune, and Entei quite a bit. As far as their appearance in Generation III, or Latios, Latias, and (in Platinum) the bird trio? Or what Cresselia and Mespirit's deal is? Uh...
*** The game does give the excuse that Mespirit wants you to chase it (perhaps as a game of sorts), but that doesn't mean you won't still run into it entirely by accident while doing something else.
** In the original games, Moltres also qualifies. His Ice and Lightning counterparts are found at the end of optional Ice and Lightning dungeons. Naturally, you'd expect find Moltres, the fire bird, in some kind of fire-themed area. Then you find him standing around in a dead end of the underground tunnel leading to the last bosses. He was relocated to a less bizarre area in the remakes.
** In ''[[VideoGame/PokemonXAndY X and Y]]'', you can encounter Mewtwo [[spoiler:lurking in a cave in the Pokemon Village]] after defeating the Elite Four. No explanation is given in-game as to why it's there, other than [[CallBack Gen I nostalgia]] and a halfassed HandWave about the [[spoiler:village being a refuge for unloved Pokémon]].
* The FinalBoss of ''VideoGame/RogueGalaxy'' is a ''very'' odd example of this. For the first two-thirds of the game, Valkog appeared to be the BigBad; after a certain event ([[spoiler:actually reaching Mariglenn/Eden]]), Valkog and his flunkies are suddenly demoted to QuirkyMinibossSquad and you don't expect to even SEE them again. However, once you face off against the supposed new BigBad in a [[OneWingedAngel two-stage battle]], Valkog shows up again...and through a convenient plot contrivance, he and his two flunkies ''and their spaceship'' are transformed into the FinalBoss.
* Ah, ''VideoGame/{{Okami}}''... a long and winding story based on Eastern mythology and presented in a heavily stylized watercolor graphics evoking old Japanese prints. During the game, you battle shadow demons, multi-headed dragons, and Tengu to finally reach the final boss: A black whale-like fetus in a glass orb driving around a glowing technological ball-shaped mecha in the heart of a star ship. The idea may have been to give Yami a sense of [[OutsideContextVillain wrongness]] compared to the rest of the world, but it still comes out of nowhere.
** Its sequel, Okamiden, has Asteroidean. While all the other bosses in the game have some sort of story relevance, Asteroidean is just a random starfish that is fought underwater, with no mention before it appears, no dialogue before or after the fight, and no mention of it for the rest of the game after. In fact, most people who play the game tend to forget it's even in the game to begin with.
* Erebus, the final boss of ''[[VideoGame/{{Persona3}} Persona 3: The Answer]]''. It ''was'' mentioned in the first game that [[spoiler:Nyx, the BigBad, was being called into existence by the despair and depression of humanity]], but the player was probably not expecting that [[spoiler:those emotions would take the form of a giant, two-headed... thing made of shadow]]. For that matter, the main game's BigBad was also kind of an example, being revealed after 80% of the game was over and never explained beyond wanting to bring about TheEndOfTheWorldAsWeKnowIt.
** One could make the same case for ''VideoGame/{{Persona 4}}''[='=]s TrueFinalBoss, only she is revealed at the very last minute (as in moments before you're supposed to leave town on a bus.) This is made more apparent because the true murderer of the case you were trying to solve has already been defeated, as well as the being that was behind him. The plot also winds and swerves in so many directions that spoiling the TrueFinalBoss by itself doesn't really give away anything else.
*** Of course, Persona 4's True Final Boss is the answer to the first question the player likely ever had. "Why do I suddenly have the power of Persona?" Thematically, that the player stopped caring after the first few minutes makes it the ultimate expression of the "Fog of Truth" -- the question that cannot be seen.
* In ''VideoGame/DarkCloud 2'' (Or ''Dark Chronicle''), the final boss of the game, at the end of a bonus dungeon, is the BigBad (for no reason) from the previous game.
** Exists outside of time. It is the link between the games.
* A ''lot'' of the bosses in ''VideoGame/LastScenario''. Some (generally the more human ones) at least merit some acknowledgment by the characters, but others (say, the Viviones) are never mentioned again, even if they [[ThatOneBoss took you a dozen tries to defeat]].
** And then there's the mother of all Giant Space Fleas From Nowhere, unlocked by beating the game after collecting every hex tile, at which point it's just hanging out on the World Map waiting for you to fight it with no explanation or even a single line of dialogue: [[spoiler: Planetary Consciousness.]]
* ''BatenKaitos Origins'' is particularly infamous for one of these. The game is a double disk, and you switch from one disk to the other right after battling a boss and moving to a new area. You have to save your progress when inserting the second disk, only to be shipwrecked and stranded in a hostile forest instantly and having to battle one of the most ridiculously difficult boss battles in the game (since, most likely than not, your party will be severely underleveled and the boss can heal itself). It ends up being one of the cheapest battles in the game, since it's completely unexpected and thus you'll be unprepared for it. And since you're stranded in a forest and you just saved your progress, you can't go back to raise your characters' level.
** BatenKaitos Lost Wings and the Eternal Ocean is similar. At one point, you're in a [[BigBoosHaunt ghostly area]] where it's stated that the walls between dimensions is weak. Best way to showcase this? A giant monster bursts out of another dimension, and you fight it back in.
* The original ''Franchise/DotHack'' games were actually decent about its Giant Space Fleas. All the 8 Phases of Morgana may have looked bizarre -- as [=BlackRose=] was oft to point out -- but there was a point where that was expected. Even Cubia was given ample foreshadowing, although his initial appearance at the end of the first game certainly may have been a surprise.
** The [[DotHackGUGames .hack//G.U.]] games each play out by introducing successive Space Fleas at the end of each game: the first game ended with a surprise AIDA infection after a battle with Tri-Edge [[spoiler:actually, Azure Kite]]; the second game ended with [[spoiler:Tri-Edge being revealed as the monster hiding in Ovan's arm]], hitherto [[spoiler:thought to be where Corbenik was hiding]]; then, suddenly, in the last game, [[spoiler:Cubia appears]].
*** [[spoiler:Cubia]] was mentioned in the G.U. Terminal Disc that came with ''Rebirth''. In a very usual [[AllThereInTheManual hackish way]], it had not been entirely forgotten.
*** However, the Terminal Disc [[NoExportForYou was only released on the special pre-order version in the US release]], so if you got the regular version, there was [[GuideDangit no way for you to know about that]].
* Quite a few of the bosses in ''VideoGame/EternalSonata'' were these. Potentially justified, in that things don't always make sense in a dream.
* ''VideoGame/UltimaIII'' has one in the form of Exodus; not a traditional boss fight to end the game with, but instead, in the midst of a medieval fantasy setting: [[spoiler:a computer into which you must insert four punchcards in the proper order]]. Not exactly what you were expecting, after the first two games, but paved the way for the last-boss-less sequels.
* Armageddemon shows up in ''DigimonWorld3'' just before you get to fight the BigBad. Every other Digimon boss is foreshadowed by having an overworld sprite; he doesn't. It's debatable whether he's supposed to be a ''boss'' -- the random battle theme is used and it's possible to run from him. [[spoiler:He's also one of three old bosses featured in the final boss battle]].
** He's used in a similar capacity in ''DigimonWorldDS'', but this time he gets a line of dialogue and the player's character explaining what he is.
** The main plot of ''Digimon World 3'' also does this. All of the terror in the Digital World was supposedly caused by [[spoiler:the MAGAMI company]]. However, after dispatching all of their head honchos, something called [[spoiler:Lord Megadeath]] shows up and claims responsibility for everything. You are then transported to his orbiting satellite, where you fight him. Absolutely no mention of this character is made until just before that sequence.
* The BigBad of ''{{Anachronox}}'' is not revealed until the very end[[note]]You ''can'' actually see him while on a trip to Sunder.[[/note]], his name is not revealed, nor is anything known about him. It doesn't help that the game was supposed to [[SequelHook have a sequel]].
* The ''ValkyrieProfile'' series has a few, but a particularly odd one is Ull, from ''VideoGame/ValkyrieProfile2Silmeria''. He appears in a brief cutscene establishing that he knew Silmeria at some point in the past, does his job as WakeUpCallBoss, and is then never seen or mentioned again.
* ''[[BaldursGate Baldur's Gate 2]]'' had the Twisted Rune. Originally intended as the [[TheManBehindTheMan hidden cabal]] behind several sidequests, including the Athkatla slaver ring and the serial-killing tailor, the actual breadcrumb trail that was to lead to them ended up as cut content. They remained in, however, peacefully chilling in their evil clubhouse under the docks district unless the player randomly stumbled across the entrance, resulting in being dropped straight into a battle with an [[CosmopolitanCouncil eclectic]] bunch of [[BonusBoss obscenely overpowered spellcasters]] after trying to enter an ordinary-looking house.
* ''VideoGame/GoldenSunDarkDawn'' does a ([[UnreliableNarrator deliberately]]) bad job of recapping the [[VideoGame/GoldenSun first two games]] in the "Sun Saga" books and Psynergy Training Grounds in-verse. Among other things, they made Alex and [[HeroWithBadPublicity Felix]] into the {{Big Bad}}s of the story, leaving the Fire Clan, the AntiVillain main antagonists of the games, to look like "freaky dragon people from nowhere".
** Interestingly enough, the previous game in the Golden Sun series, ''VideoGame/GoldenSun: The Lost Age'', actually ''subverts'' this trope. At the end of the game, the main characters appear to be unhindered as they achieve their goal. Suddenly, the Wise One, a character that [[ChekhovsGunman appeared very early on in the first game but was seemingly forgotten about until the very end]], appears and summons a three-headed dragon to combat the characters. At this point, almost every playable character responds similarly to the player himself would at this point, pointing out that it's kind of odd that a being with god-like powers would do something as weird as summon a dragon to fight the protagonists, especially considering (which the characters actually point out), they've already defeated a two headed dragon in the last game. All the characters respond this way... except for token [[TheObiWan Wise old master]] Kraden. [[spoiler:He realizes that nothing from a being called the Wise One could possibly be that simple, and, [[GenreSavvy realizing that every major dragon they fought in the series was someone transformed]], realizes that the three-headed dragon was actually the main characters' missing parents fused together. He tries to warn the characters, but is unable to before they defeat the dragon, fatally wounding their parents in the process. Whoops.]]
* ''VideoGame/BraveSoul'' has two. One is a giant flying goldfish, although it gets a pass since it's found in some sunken ruins, and most of the monsters in the game look pretty weird anyway. The other, however, is a giant beetle, found in a Dragon's cave, and can't even be fought during the first visit, because of a scripted event triggered by the associated quest taking over control and moving the player directly to the destination. The only reason it was even included was because one of the developers already made it.
* The third Darm Tower boss in ''VideoGame/{{Ys}} I and II'', Khonsclard, is some weird spinning conglomeration of rocks. Many other bosses in the series also qualify, solely acting as {{beef gate}}s or guarding {{plot coupon}}s.
* ''VideoGame/{{Drakengard}}'' is mostly a hybrid of DynastyWarriors style HackAndSlash and ''VideoGame/PanzerDragoon''/''AceCombat'' style flight combat. The TrueFinalBoss is a NintendoHard RhythmGame. It should noted that the game's soundtrack is primarily composed of classical music samples arranged to sound harsh and dissonant. All the other possible Final Bosses are fought in the same way you've been fighting for most of the game.
* In ''VideoGame/TheElderScrollsVSkyrim'', there's a quest for the Thieves' Guild where [[CorruptCorporateExecutive Maven]] [[IOwnThisTown Black-Briar]] hires you to sabotage a competing meadery. The quest involves putting what amounts to rat poison into the Honningbrew Meadery's brew, and killing the skeevers (giant rats) that prompted the owner to hire an outside exterminator. Then you find an insane spell-slinging self-styled skeever master in the tunnels under the meadery. And he's not {{Squishy|Wizard}}, and you have no clues that he even exists until the first Firebolt collides with your head. After you kill him, you can loot his journal to find out his backstory, and the quest-giver admits they knew about him but didn't tell you, but going in you have no warning he's going to be in there and his arrival is very surprising.
* ''VideoGame/{{Grandia}}'' has this this in spades, not to mention you fight some of them again for no explained reason.
* ''VideoGame/DragonAgeII'' has The Ancient Rock Wraith, the final boss of the first act. While there is a lore explanation for it (it's the spirit of a dwarf too evil to return to the Stone), it's only revealed after the battle.
* In the GBA adaptation of Harry Potter and the Prisoner of Azkaban, the final boss turns out to be none other than [[spoiler:''Draco Malfoy!'']]. There was absolutely no build-up to him being there whatsoever (mind you, this didn't happen in the book) and quite literally just pops up just as you're about to rescue Sirius. The battle itself has ''literally no'' impact on the story whatsoever. Its only purpose is possibly to have a more satisfying final boss as compared to the fight against Lupin (which wasn't really a fight, so much as it was "keep Buckbeak alive").
** To make it worse, the game tricks you into thinking that Lupin would be the final boss, since aside from the Demetors, he's technically the last enemy Harry and his friends face in the book. Not only that, he received his own unique battle theme so you know that he's not a normal boss and he is fought at the climax of the story.
** Then again, the game is absolutely rife with GSFFN. It contains inexplicable fights against a mountain troll, a forest troll, a venomous Tentacula, a giant rat, several run-ins with the Monster book of Monsters, and perhaps most inexplicably of all (bar the final boss): [[spoiler:Crabbe and Goyle]], who appear for no reason during the transfiguration maze!

* In ''MetalCombat'', after defeating the "real" Anubis (who seems to be either a robot or a particularly extensive cyborg), you fought Typhon and [[AmbiguousGender his/her]] ST, Giga-Desp.
* The ''{{Strikers|1945}}'' series (1945, 1945II, and 1945III/1999) lives on this trope. The attract screen and the PS1 version opening doesn't hint any [[spoiler:HumongousMecha forms of whatever boss fortress you face and an alien entity as the final bosses]]. Instead, the attract screens and intros show a WWII-themed shmup.
* ''AeroFighters'' has an alien entity -- [[KillerSpaceMonkey a giant skinless apeman]] -- break off a jar as the final boss. The second game has you fight a black eyeball that resembles Buckbaird at the end, or a BedsheetGhost, which is randomly selected. Finally, at the third game, if you proceed good, you either fought a mutant ghost submarine in Bermuda Triangle, or go off to space and fight an UFO in another route. Do badly, and you'll fight a joke cartoon thing instead. And the rest of the game is you fighting various modern-day ([[SchizoTech sometimes future]], however) war machines with a jetfighter (except the third). Oh, did I mention that you either go into space, a temple, or underwater in the final stages?
* In ''VideoGame/{{Touhou}}'', the EX stage of ''Lotus Land Story'' has Reimu and Marisa wandering through a dream world, uncertain how they even got there. Cue getting randomly jumped by the ''creator of that world'' in the guise of a {{Meido}}... and, once you've trounced her, her ''[[StrongerSibling big sister]]'' shows up.
** More generally, the early stage bosses are unlikely to have much to do with the plot, though the games seem to be moving away from this, as of the 12th and 13th games.
*** Lampshaded and inverted in Reimu's storyline in ''Lotus Land Story'', where she pretty much only calls out and attacks the Stage 1 boss because she knows there's supposed to be a boss fight. Said boss was ''hiding from Reimu''.
* Jitterbug is built up as the BigBad of Cave shooter ''DeathSmiles''. After you beat him, however, [[NamesToRunAwayFromReallyFast Tyrannosatan]] suddenly jumps out of an open portal to ''eat'' him. Tyrannosatan has no relevance to the plot, and is only there to provide a more climactic final boss. [[spoiler:Although Jitterbug can come back as [[TrueFinalBoss Bloody Jitterbug]] depending on how you've done.]]
** Jitterbug may have attempted to summon Tyrannosatan, but since EvilIsNotAToy, it eats him. Bloody Jitterbug may be the result of Jitterbug absorbing Tyrannosatan's power.
** More likely, given Jitterbug's motivations [[spoiler:to return to Earth]], Tyrannosatan is the force behind the demonic invasion that came through said portal before him.
* Since ''{{XOP}}'' has no real plot, most bosses are like this, but the final boss of the original is the most blatant. You've been fighting weird translucent aliens for the entire level, then you get the boss warning, and travel down some organic tentacled landscape, shooting blobs. Then you make it to an egg, it hatches...and a phoenix comes out and starts [[BulletHell shooting lasers all over the place]].
* VideoGame/GunBird2 has you racing to collect elements to make a [[MacGuffin cure-all medicine]] to resolve whatever ExcusePlot there is in the game (each of the 5 characters has a reason for the need of the medicine) and fighting off a GoldfishPoopGang pirate crew who wants the medicine for their own evil deeds. Then you get to the main boss- [[spoiler: a giant {{Expy}} of Japanese pharmaceutical mascot Sato-chan (an orange-colored anthropomorphic elephant)]]. Ok, so maybe ItMakesSenseInContext, but it still qualifies since said final boss this was never mentioned in the game until the moment he appears, and up until then, the villain has always been said pirate gang.

* Every other boss in ''GodHand'' seems to be one of these. Mind you, it's part of the game's appeal: You know that a game is unique when you get to fight two HardGay twin thugs in {{stripperiffic}} outfits, a TerribleTrio whose hobby is to cut random people's arms off, [[EverythingsBetterWithMonkeys a masked gorilla who uses pro-wrestling moves]], a rock duo from hell who attacks by shooting [[BeamOWar lazers and beams]] from their instruments, a group of five midgets dressed in PowerRangers style clothing, an afro-coifed black disco reject in a yellow vinyl suit, replete with arm tassels and flare bell bottom pants. Gene even [[LampshadeHanging comments]] this, after beating the Psychic Midget in the caverns, by saying that the paranoid old hermit seemed [[NoFourthWall to pick the wrong game to appear in]].
* The ending of ''NoMoreHeroes'' has '''got''' to be a parody of this, with a long stream of nonsensical boss fights and totally non-foreshadowed plot twists which push Travis to break the FourthWall and complain that the developers are just making this up as they go along.
** The best example period is Mimmy from the second game. Travis has completed one of the toughest fights in the game and is now 7th, had a tense, sort of tough-to-watch scene, and suddenly [[http://www.youtube.com/watch?v=Dfma_bqEDWY this]] happens.
* The classic ''Comicbook/{{X-Men}}'' arcade game inexplicably throws Nimrod (an advanced Sentinel from the future) at you. It doesn't make any sense why he would be working for Magneto, since he was designed to hunt and kill mutants. The same could be said of {{Wendigo}}, another boss in the game who has no connection with Magneto.
** At the end of the second-to-last level, some pharaoh statues attack you in the tomb without any foreshadowing, and earlier on in the level, the players get attacked by six weak clones of Pyro.
* As depicted above, ''VideoGame/{{Growl}}'' is all about beating hordes of poachers to death and freeing captive animals. When you take out their leader (a masked freak with enough strength to throw a tank), his corpse begins to slither around the arena, when suddenly [[BodyHorror a millipede bursts out of his back]] and states that ''it'' is the true leader of the poachers. (Players of the ''VideoGame/{{Darius}}'' games will recognize it as [[OutsideContextVillain one of the aliens from those games]], but there were barely any hints that ''Growl'' shared a universe with them.)
* In NoituLove 2 we have some pretty strange bosses. Starting with [[https://www.youtube.com/watch?v=NfBQSQWYKH4&list=UU3Q13RAmFVfDkYOWnnqFM2A a boat with tank treads that tries to run you over]] in stage run, to a [[https://www.youtube.com/watch?v=f-CVtyAp8cY&list=UU3Q13RAmFVfDkYOWnnqFM2A&index=89 train that apparently thinks it's some kind of transformer]], to the last boss, which becomes [[https://www.youtube.com/watch?v=LIMWLSurr6g&list=UU3Q13RAmFVfDkYOWnnqFM2A&index=86 a fetus thing, a giant mechanical thing with gears,]] and... [[ArsonMurderandJaywalking A person.]]
* The arcade version of ''VideoGame/DoubleDragon II: The Revenge'' took a turn to the occult for some of its enemy characters. The first boss, Burnov, is a masked wrestler who, instead of blinking into non-existence like all the other defeated enemies, will stand up and yell with his arms raised and then vanish into thin air, leaving behind his clothes and mask. In later encounters, he will rematerialize after using his death animation once. Later in the final stage, after defeating Machine Gun Willy, the game seems to be over until the player's own shadow starts gaining a life of its own and attacks the player as the actual final boss.
** The TrueFinalBoss in the NES version is a nameless martial artist with the ability to make himself invisible in battle. [[AllThereInTheManual Unless you've read the manual]], his existence is never hinted anywhere in the game. He is also a MasterOfIllusion, which explains why your [[YourMindMakesItReal shadow gained sentience...]]
** For most of ''Double Dragon 3'', the player spent their time fighting human enemies such as bikers, martial artists, swordsmen, and scantily-clad Roman warriors. In the fifth and final stage, the enemies consist of living tree people, stonemen, and the reanimated corpse of Cleopatra (which in the NES version is a possessed Marion).
* When TheSimpsons got their own BeatEmUp [[VideoGame/{{THESIMPSONS}} arcade game]] made by Konami, there was only the first season to draw material from. Thus, we got such surreal bosses as [[AdaptationalVillainy an evil Werner von Brawn]], a Krusty The Clown parade float piloted by Mr. Smithers ([[AdaptationalVillainy who is also evil]] in this game), [[ThoseTwoBadGuys two mobsters]] who copied the two-player combination attacks, a Cerny-esque fire-breathing giant hiding in Moe's Tavern, a {{bear|sAreBadNews}}, an anthropomorphic bowling ball conjured by [[BattleInTheCenterOfTheMind Homer's imagination]], and a Noh Theater actor with a BladeOnAStick.
* ''AnarchyReigns'' features random boss fights commencing in its multiplayer matches: particularly, a GiantSquid named Kraken, and a HumongousMecha named Cthulhu ([[DidyouJustPunchOutCthulhu which you can punch out]]).

[[folder:Fighting Games]]
* ''[[VideoGame/CombatOfGiants Battle of Giants]]: Dinosaurs'' has Mystery Bosses, who are not super dinosaurs, but instead angry inanimate objects. They include monster trucks, rockets, ''telephone boxes'', and ''a schoolhouse''. It's jarring because otherwise you're in some kind of ''Land Before Time''-esque world filled with dinosaurs, and no explanation is give for the phone boxes attacking you. On the other hand, seeing a T-Rex beat up a school is crazy awesome.
* ''[[CapcomVsWhatever Marvel Super Heroes Versus Street Fighter]]'': The seventh round is Apocalypse, fair enough, he's a significant Marvel villain... and then, [[MemeticMutation Suddenly, Cyber-Akuma]]!
** Akuma similarly comes from nowhere to face you in Puzzle Fighter (then again, the boss you were "[[BaitAndSwitchBoss supposed]]" to fight is [[JokeCharacter Dan Hibiki]]).
*** Ditto for Akuma's first appearance as the TrueFinalBoss in ''Super StreetFighter II Turbo'', where he appears out of nowhere and kills M. Bison, who you normally fight. His name wasn't even shown then.
*** This happens ''again'' in ''VideoGame/CapcomFightingEvolution''. The game [[NoPlotNoProblem doesn't have a plot]], yet it's still ridiculous seeing Shin Akuma suddenly showing up after defeating [[VideoGame/{{Darkstalkers}} Pyron]]. Admittedly, you can only fight him after fulfilling specific requirements, but still...
** If you said that [[{{Okami}} Yami]] would be the boss of ''Tatsunoko vs. Capcom'' prior to its release, everyone would be mocking you.
*** After the boss battle, do they talk about their achievement? No, they do a completely different task, ''[[BigLippedAlligatorMoment and they never mention fighting Yami again]]''.
*** Improved upon in ''Ultimate All-Stars'', where some characters do in fact acknowledge 1) that Yami pulled their worlds together and 2) they had to beat it to undo said pulling.
* The ''VideoGame/{{Touhou}}'' fighting game ''Touhou Hisoutensoku'' features three of them. One is Utsuho Reiuji, the final boss of ''Subterranean Animism''. It's a bit of a stretch, though, as Sanae is descending into the geyser control center when you run into her, and if you're at all familiar with the story of ''Subterranean Animism'', you probably expect to see her or at least someone else from that game. After you beat her, however, you fight Sanae's final boss, Suwako Moriya, who actually ''does'' come out of nowhere. Given that Suwako is already in the game as one of Sanae's assists (and you can even use Sanae's Suwako assist during the fight!), it's safe to say that no one was expecting her to be Sanae's final boss.
** However, even Suwako pales in comparison to the horror that is [[http://www.youtube.com/watch?v=671SA4Pg6Hw Hong Meiling's final boss in her story...]]
* Who's the final boss of ''GuiltyGear Isuka''? Is it Justice? Nope. Dizzy? Nope. That Man?!? Nope again. It's Leopaldon. Some strange, gigantic white beast with a huge puppy inside its mouth that is being controlled by a man in black who looks somewhat like [[Franchise/FinalFantasy the Black Mage.]]
* The final boss in ''VideoGame/{{Tekken}} Tag Tournament'' is Unknown: a woman whose actions are controlled like a puppet by a forest spirit -- which looks like a werewolf's torso -- floating behind her. It probably helps that the game is non-canon, but she/they still come out of nowhere.
** Tag Tournament 2 has Unknown return, but is less [[BuffySpeak Space Flea-y]], because the game confirms the EpilepticTrees floating around about it being Jun Kazama. Also, as a ContinuityNod to Unknown's own ending from the first, the wolf thingie is gone.
* SamuraiShodown 6 is a [[DreamMatchGame "festival"]] game whose [[ExcusePlot plot]] is basically that Yoshitora Tokugowa is holding a swordfighting tournament and will use his powers as "ruler of everything" to grant the winner one wish. The tournament gets [[HijackedByGanon hijacked]] by one of the four previous final bosses, ''then'' you go to HELL and fight Demon Haoh, right out of nowhere. Like the Tatsunoko vs. Capcom example above, neither the "hijacked" boss or Demon Haoh are ever mentioned again.
* ''VideoGame/SuperSmashBros Brawl''[='=]s ''Subspace Emissary'': [[Franchise/{{Pokemon}} Rayquaza]] attacking [[VideoGame/DonkeyKongCountry Diddy]] and [[VideoGame/StarFox Fox]] for no apparent reason. From a ''[[MisplacedWildlife lake]]''. It's supposed to live in the ''sky''.
* The obscure arcade fighter/beat 'em up hybrid ''Mutant Fighter'', after having you battle a variety of fighters and beast in hand to hand/grappling combat, reveals its final boss to be...'Magician', a wizard who barrages you with spells and doesn't throw a single punch. While not as jarring as some examples, the fact that you get to the end of this elite warrior hand to hand tournament and find a magician is like getting to the end of StreetFighterII and finding a [[TheTerminator Terminator]] expy waiting for you instead of M.Bison.


[[folder:[=MMORPGs=] ]]
* Kil'jaeden, the FinalBoss of the first ''VideoGame/WorldOfWarcraft'' expansion, ''The Burning Crusade'', could easily be considered one of these by players who aren't well versed in the background story of the game. It's not so much that he's an unknown entity (he's not), but that all of the marketing of ''Burning Crusade'' was focused exclusively on Illidan, the final boss of the Black Temple. Kil'jaeden, despite being one of the canonical {{Big Bad}}s of the series, got almost no mention at all from the in-game story until suddenly being introduced in patch 2.4. Despite this, Sunwell Plateau (where you fight Kil'jaeden) is widely considered a CrowningMomentOfAwesome in terms of dungeon design.
** Blizzard has actually stated themselves that they released Black Temple too early and needed to find some way to keep everyone interested in the game. Still, it worked.
** In Drak'Tharon Keep, the players fight a skeletal wind serpent named Tharon'ja. It's unclear whether this is supposed to be a spirit that the trolls worship, or a troll that ate its god like the trolls of Gundrak did.
*** The Dungeon Journal introduced a patch and a half later explains that Tharon'ja was indeed one of the trolls who killed and stole the power of a loa, only to be killed in turn and turned into a servant of the Scourge and the Lich King.
** Prince Malchezaar of Karazhan. The other bosses are mostly ghosts or magical constructs left behind in Medivh's castle, but while he's associated with the Eredar, it's never stated why he is there. The same applies to the nether dragon Netherspite.
*** Malchezaar is considered by Blizzard to be the last boss of Karazhan, effectively making him its ruler, as far as the unexplained storyline goes. The question of what does the [[LegionsOfHell Burning Legion]] want to do with a place like [[EvilTowerOfOminousness that]] is left for us to wonder.
*** [[EldritchLocation Karazhan is the only place they can do]] ''[[EldritchLocation anything with at all]]''. It reaches into the Twisting Nether and thus can be used to try and invade Azeroth. In fact, it's been hinted that Karazhan was relatively quiet up until Malchezaar appeared and started stirring up the spirits.
*** More importantly, Karazhan is three unfinished dungeons (Well, one finished, two unfinished) combined into one.
** A lot of minor dungeon bosses are this. They get one throw-away line to explain who they are and what they're doing. Sometimes.
*** In ''Cataclysm'' some effort has been made to explain some of the more bizarre bosses. New quests for classic dungeons offer some explanation of their background, though not every boss gets this.
** Speaking of Cataclysm, let's not forget the final boss of the Worgen starting zone. Rather than using Crenshaw, the previously-introduced undead general that had bombed Gilneas City, Blizzard decided to put you and your friends up against a weird mutated orc named "The Machinist", who had never even been hinted at.
* ''GuildWars'' has one of these in ''Eye of the North'', the Disc of Chaos. It has some of the highest health and damage seen on a mob and uses a model that has been flipped horizontally so it floats. The Disc only appears during its fight and is never mentioned before or after.
** The Disc stands out even more due to its name. All other Destroyers have names in the format of "Destroyer of" or "of Destruction". The Disc is the only Destroyer to not follow this pattern.
* ''{{Runescape}}'' has Chaos Elemental who, instead of residing in some sort of cave or building, is located in a seemingly uninteresting and generic spot in the Wilderness.
** A few of the quests have boss battle creatures that come out of nowhere and have nothing to do with the story, just to make the quest a bit harder.
** Lamp-shaded in the 'could you fetch my ball from the fenced yard' quest: the unnecessary boss morphs into six or seven arbitrary forms with escalating difficulty. Inverted in that earlier in the quest, you read the witch's journal where she mentions her experiment.
** Averted in My Arm's Big Adenture. In this quest, you teach a troll how to farm. Once you have the stuff you need, My Arm (trolls are named for either the first thing they try to eat, or for the noise said thing makes; it was his father's arm) warns you about a "bird". Sure enough, once the goutweed is planted, a Giant Roc attacks you. If you're the type of player who ignores dialogue, you would have been caught by surprise. The mod who wrote the quest was probably counting on that.
* ''PuzzlePirates'' has "[[http://yppedia.puzzlepirates.com/Monkey_boat monkey boats]]". [[strike:ForScience]] [[FakeBalance For balance]].
* As silly and nonsensical as ''VideoGame/KingdomOfLoathing'' is, the final boss of the main quest takes it to a whole new level. Most other enemies in the game are parody versions of [=RPG=] monsters, which you kill with weapons and/or spells with goofy names. The Naughty Sorceress is no exception; she appears to be your basic evil female spellcaster, but her [[OneWingedAngel "true form"]] is [[spoiler:some kind of EldritchAbomination covered in eyes, fanged mouths, and CombatTentacles.]] After you beat ''that'', she takes on her "[[ExaggeratedTrope actual true form]]" and turns into [[spoiler: a goddamn ''sausage''. With ludicrously high HP and RealityWarper powers. Which can only be defeated by using ''anagrams'' to deflect its attacks.]]
* Invoked in ''VideoGame/PhantasyStarOnline2'', thanks to the randomly-generated nature of the game's stages, particularly multi-party areas, where bosses can spawn at any time. Even bosses from different fields (but still the same planet) can spawn, such as the Tranmizer, the sub-boss for Lillipa's Mines, appearing on Lillipa's Desert and Quarry. Darker bosses are exempt from the "same planet" rule, and can spawn in any field, regardless of which field they act as the boss of. Also, some event quests subvert this rule: a limited-time map introduced in February 2014 features bosses from Lillipa and Naberius spawning on Vopal's Coastline. The only exceptions to this rule are Val Rodos (Vopal Coastline's boss) and [[spoiler:Dark Falz Elder (an emergency quest-exclusive boss)]], due to their large size and the unique nature of their battles.
* In the ''VideoGame/StarTrekOnline'' mission "Installation 18", if you're playing as either a Federation or Klingon character, this is the first time you meet an Elachi. It's tough to fight, especially flanked by Tal Shiar soldiers, and it holds no bearing to ''either'' storylines. This is because it's actually geared towards the ''Romulan'' player, who has a whole history of dealing with these things.

* The boss of the Sandopolis Zone Act 1 from the SonicTheHedgehog game ''Sonic and Knuckles''. All of the other bosses in the game (and in fact most other Sonic games) are either Robotnik or his robotic henchmen. And then at the end of Sandopolis we get this big huge... golem thingy that you have to trick into the nearby quicksand pit. Yeah.
** Actually referenced in ''SonicAdventure2'' with the "Egg Golem" boss. Except that one was bigger, defeated in a different way, and was a robot.
** King Boom Boo from ''Sonic Adventure 2'' fits this trope perfectly. Seriously, Knuckles has to fight a giant bug-eyed ghost with a rainbow colored tongue for no reason? What was the point in even having this thing in? Did fighting the ghost even do anything to advance the plot?
*** Amusingly, the ghosts in that game are references to the aforementioned Sandopolis Zone.
*** Also from ''SonicAdventure2'', the Biolizard. The only foreshadowing we get to its existence was a report Rouge found that called Shadow's identity into question. Then Sonic and company have to keep the ARK from pulling a ColonyDrop and come face-to-face with a massive red biomechanical reptile, which later fuses with the colony's WaveMotionGun to continue steering the colony towards Earth. Sure, there's some foreshadowing that Shadow is ''not'' the first constructed creature while trying to make the ultimate life form, but chances are no one expected ''this'' to be his prototype.
** The first boss of ''VideoGame/SonicRushAdventure'', the Ghost Rex. The actual plot of this game is built up very slowly, and so many of the first few levels are just Sonic and Tails trying to accomplish some things on their own, so when a gigantic, mechanical [[EverythingsBetterWithDinosaurs T-Rex]] drops down and fights Sonic before a villain has even been established, it's... jarring, to say the least.
* [[spoiler:Heinrich]] from ''VideoGame/ConkersBadFurDay''. Up until this point, the BigBad had been the Panther King. You're all ready to fight him, and [[spoiler:a xenomorph implanted by his [[TheDragon mad scientist right-hand man]] [[TheStarscream pops out of his chest]] and becomes the FinalBoss. Yes, [[Franchise/{{Alien}} THAT xenomorph]].]]
* ''PunchOut (Wii)'' has one when you get to fight a hidden boxer. [[spoiler:Franchise/DonkeyKong. Yes, the same Donkey Kong who beats up Kremlings and plays with Mario in sports and go-karting. He has no relation to the Punch Out franchise at all...unless you've played the old arcade version and seen TheCameo]]. See, sometimes there's a point!
** You want to know what the original secret character was? [[spoiler:Princess Peach. [[http://kotaku.com/5320198/punch+out-devs-talk-graphics-difficulty-nixed-princess-peach-idea No joke]].]]
* ''Videogame/AloneInTheDarkTheNewNightmare'' features a battle with a nightmarish Insectoid Winged Demon from Nowhere MiniBoss in the Library.
** Before that, some sort of sea monster attacks you in the sewer (if you play as Edward) or out of a ''rug'' (if you play as Aline).
* ''VideoGame/{{Postal}} 2'' was a semi-realistic game in that there were no "bosses" or monsters, just a free-roaming journey through a town inhabited by assorted screwed-up gun-toting humans with varying levels of craziness. ''Postal 2: Apocalypse Weekend'' ends with the sudden and completely out-of-left-field appearance of a "final boss" in the form of a 20-foot tall demonic half-cow half-man who declares "I am Mike J, Kosher Zombie Mad Cow, God of Hellfire! All bow down, and worship my asscock!". The Postal Dude promptly lampshades the trope by stating "Some designer has lost his tiny mind".
** Actually, an easily missed passing mention was made by one of the [=NPCs=] at the start of the expansion about his colleague named Mike J catching Mad Cow Disease. But that still came out of nowhere since one does not expect this to happen to a Mad Cow Disease victim in real life.
* While every boss starting with Kling Klong in ''[[VideoGame/LittleBigPlanet LittleBIGPlanet 2]]'' is some creature either created by the Negativitron, the boss of [[EternalEngine The Factory of a Better Tomorrow]] is... Copernicus the Guard Turkey. No one ever mentions that the factory even '''has''' a Guard Turkey, but when you beat the fourth level of the world, Clive will show up, horrified, and tell you that Copernicus is on the loose. After a [[AdvancingBossOfDoom quick chase]], Copernicus is dead and the plot resumes as usual.
* ''VideoGame/WinBack'': Jin, the McNinja boss, is a blatant example. He is the only boss in the game to not have any introductory dialogue before the battle.
* The final boss of ''RazingStorm'' is an enormous skull-shaped battleship. One of your comrades lampshades its sudden appearance by asking why no one told him about it, to which someone else responds, "Because we didn't know about it! Now [[MoreDakka keep firing]]!"
* "Caduceus", the final boss of ''VideoGame/{{Strider}} 2'', not only pops out of nowhere with no explanation or relevance to the plot, but is in fact gigantic, fought in outer space, and unmistakably flea-like.
* ''BeyondTheBeyond'' has Akkadias as the final boss, who is not mentioned anywhere prior in the entire game. The rest are all plot-relevant.
* SpiderMan is a [[http://www.i-mockery.com/shorts/shinobi-vs-spiderman/ boss fight]] in ''Revenge of {{Shinobi}}''. The only foreshadowing of this is a 'Copyright of Marvel Comics' at the beginning of the game.
** Franchise/{{Batman}}, Franchise/{{Godzilla}}, and a Franchise/{{Terminator}} were also bosses in some versions of the game. Seems like Sega liked NoCelebritiesWereHarmed.
* The [[MultiArmedAndDangerous six-armed]] humanoid ("God Vishnu" according to the sound test) in Level 17 of the SNES AdaptationExpansion of ''VideoGame/PrinceOfPersia1'' has no relevance thematically to the rest of the game. It is the only boss other than the FinalBoss with a unique BattleThemeMusic, the only enemy that doesn't appear in the manual, and the only one that doesn't swordfight you.
* Most Bosses from ''BlueDragon'' don't really tie into even the countless sub-plots, and no one bats an eyelash after slaying them.
* A Sachen game called ''Silent Assault'' had numerous bosses which even didn't make any sense. This is supposedly a game where aliens and mind-controlled humans are attacking the Earth, but bosses also consist of a floating skull, a computer with a mouth, a clown's head on a boot, a fire-breathing tree, and, as a final boss, a pair of sphinxes. However, it's Sachen so what do you expect.
* ''VideoGame/DonkeyKongJungleBeat'' features our simian hero fighting warthogs, other gorillas, and the occasional robot elephant. Then you get to the final boss fight, and meet: The Cactus King, a weird, green, giant space-gremlin with what looks like a dead tree for a head and rides a fire-breathing pig. Nothing in the game even hinted toward this character's existence, he has no motives, and totally clashes with the aesthetic featured in the rest of the game.
* The Kalhar Boss Monster in ''SuperStarWars'', which only briefly appeared in the film as a holographic chess piece, randomly appears out of the blue to block you from meeting Han Solo in the Cantina.
* The almost forgotten SNK side shooter ''[[PrehistoricIsle Prehistoric Isle in 1930]]'' has the some of the usual StockDinosaurs as boss encounters, except the fourth one which is appropiately named "Unknown dinosaur": Part plant and part whale.
* The ending to ''VideoGame/{{Borderlands}}''. You're all geared up to fight Commandant Steele, whose mercenaries have been making your life difficult for the last quarter of the game, when suddenly [[spoiler:a massive EldritchAbomination pops out of the vault, impales Steele and swallows her whole, and then tries to kill the player.]]
** Lampshaded in the intro of ''VideoGame/{{Borderlands 2}}'', where Marcus states that the only things the Vault Hunters found were tentacles and disappointment.
* In ''VideoGame/{{Fable|I}}'', escaping a prison with your mother ends in a battle with a Kraken. What it's doing there or how it survives in what appears to be a pond of water just large enough to contain it is anyone's guess.
* ''VideoGame/SigmaStarSaga'' gives us a few of these, including some ''literal'' giant space fleas from nowhere.
* Indy platformer ''WilliamAndSly'' has this with its final and only boss. Okay, it is mentioned in the beginning that something strange must be going on at the storehouse. But still...the game is an hour or so of relaxing platforming in the vein of ''VideoGame/{{Knytt}}''. Impressive vistas, all exploration and scavenger-hunting, only a handful of not-very-threatening enemies. Then you top it off with an awkward and difficult fight against [[spoiler:a giant phantom in the shape of a cobra's head]].
* Baron Brrr in ''VideoGame/SuperMarioGalaxy'' (and also, to an extent the Undergrunt Gunner in many appearances). Baron Brrr has no lead in from the level to the boss other than being there, and unlike nearly every other boss, never appears again. Similarly, the Undergrunt Gunner, the very common cannon Monty Mole doesn't even get mentioned in the mission name, and appears in two levels completely out of the blue (and one, he's just guarding the cannon, right at the start of the level, and you don't even need to use said cannon.)
** Neither of them have anything on Kingfin, [[DemBones a giant skeletal fish]] living on his own water planet.
* The FinalBoss in ''VideoGame/{{Doom}} 64'' is a giant space fly from nowhere, and a {{Subversion}}. It is alluded to only [[AllThereInTheManual in the manual]] as what's been reviving and mutating the Demons for another invasion. The whole game and the collection of the three items for the superweapon are basically to stop this demon's resurrections from continuing.
* In the game ''VideoGame/{{Sanitarium}}'', after navigating a hedge maze, you have to face a scarecrow with a pumpkin for a head, wielding a scythe. The game may be based in [[spoiler:the PC's subconscious mind]], but this was a serious LevelBreaker.
* Tutankhamenattack in the NES version of ''VideoGame/LifeForce'', which is, as his name suggests, a giant pharaoh mask. The stage is also a BigLippedAlligatorMoment.
** The international releases of the game using the "fight through an evil invading alien fleet" graphics from Salamander while putting the "fight through the body of a giant planet-eating alien" plot from the arcade version of Life Force (an UpdatedRerelease of the ''Salamander'' arcade game with redone graphics to match the plot change) in the manual didn't exactly help matters.
* In ''DawnOfWar: Winter Assault'', there are two campaigns, Order (Imperial Guard and Eldar) and Disorder (Orks and Chaos). If you play the Disorder campaign before you play the order campaign you will be immensely surprised in mission five when [[spoiler:Necrons, whom you had no knowledge of even being in this system, let alone coming to this planet, land and attack you. When you play the Order campaign it is explained by the Eldar characters that the Necrons are coming and why they want to attack.]] But if you play Disorder without playing Order first they seem like a Giant Space Flea From Nowhere.
* After defeating the BigBad Plutonium Boss of ''VideoGame/BlasterMaster'', a strange cyborg knight with a [[WhipItGood plasma whip]] appears out of nowhere to challenge you.
* In ''VideoGame/LegendaryWings'', after defeating the last version of the RecurringBoss, you fight a teleporting robotic GiantEyeOfDoom for the TrueFinalBoss.
* Magic Mushroom from ''TonicTrouble'' who randomly shows up to [[ItMakesSenseInContext steal your last piggy bank.]]
* The appropriately-named Unknown Entity in ''VideoGame/TombRaiderLegend''.
* This is always what forgotten beast attacks in ''VideoGame/DwarfFortress'' are. They attack with no warning, kill everything they find, and then promptly are killed or the fortress is wiped out.
* In ''VideoGame/MasterOfOrion'' a Giant Space ''Amoeba'' From Nowhere will occasionally show up and charge across the map, killing everything in its path until it's destroyed. If you take it down, you get a significant boost to your standing with the other races.
** In the sequel, it's a mild nuisance at best, unless you happen to encounter it at the start of the game, and it eats one of your planets, leaving behind a toxic rock that takes a very convoluted method to turn back into a habitable planet.
* ''PuyoPuyo Fever'' has an interesting case. It isn't the boss of the game that makes sense (no, it's just a big plot hole), but the ''secret boss''; Carbuncle, who awards you for finding him with '''the hardest fight in the game series'''.
* The final stage of the story mode of ''VideoGame/FZero GX''. Most of the story involves Captain Falcon taking on Black Shadow and Deathborn, both of whom are introduced in the first cutscene. Nothing vastly out of the ordinary until the final stage, where, just as the story is being wrapped up, [[spoiler:three ghosts representing the developers appear and announce that Deathborn was wrong about everything. They then challenge Captain Falcon to a race in a kind of digital dimension. He defeats them, they vanish, and the story just ends there.]]
* The final boss of TokyoXtremeRacer 3 is a [[MirrorBoss ghost copy of your own car]].
* Monstrous in RidgeRacer 6 and 7 has no maker stated, making this machine even more mysterious. Racers have to wonder if where did this machine come from. [[spoiler: Even Kamata Angelus and Soldat Crinale users don't know about it.]]
* In ''VideoGame/DanceCentral 2'', the entire career mode seems to hint that the Glitterati are the final boss. However, once you beat them, you're suddenly picked up by a passing airship, which reveals a mad scientist who wants to use his robots to replace all the dance crews in the city. Suddenly you have to do five dances in a row with hardly a break in between to beat them. And you have to get near-perfect scores for each one, or you lose. This boss is never even hinted at throughout the entire game until he suddenly appears to kidnap you.
* In ''VisualNovel/HatofulBoyfriend'', dating [[CloudCuckooLander Anghel]] somehow ends in a [[GenreShift turn-based JRPG battle]] against an EldritchAbomination summoned by the school doctor with dark magics. [[http://lexlee20.tumblr.com/post/23616979639/omg-himnesia Fan theories]] posit that this creature is actually Anghel's SuperpoweredEvilSide [[spoiler:and a representation of the plague the doctor implanted in Anghel]], but during a first playthrough it's pretty confusing.
* ''KingdomRush'': There you are, fending off bandits, orcs and other such enemies from attacking your castle, placing your newly acquired paladins and wizards here and there. Cue [[MookMaker drone-shooting]] HumongousMecha who beats the everloving crap out of your troops. The other two bosses aren't nearly as unexpected.
* In ''VideoGame/ArmoredCore'', it seems the most notable difference between Normal and Hard Mode is that Hard will occasionally throw an extra enemy AC/NEXT at you, regardless of your actual mission objectives. While they aren't exactly "Giant Space Fleas" (you face other AC's/NEXT's all the time in regular gameplay), you can't help but notice that their timing is impeccable, especially if you just finished your main objective and [[ThisIsGonnaSuck you're running on low health and/or ammo.]]
* The ''entire'' penultimate level of CybermageDarklightAwakening could be considered an example of this trope, overlapping slightly with GenreShift. To recap; you've fought your way through all manner of gun-toting {{mooks}}, [[MechaMook killer robots]] and genetically-engineered SuperSoldiers in high-tech research labs, a crime-infested WretchedHive, the headquarters of a Megacorporation, a blasted-out battlefield, and an AbsurdlySpaciousSewer (twice) - all pretty much bread-and-butter for a FirstPersonShooter in the CyberPunk genre. Then right before TheVeryDefinitelyFinalDungeon you find yourself inside a gothic citadel with unmistakably medieval architecture, fighting off robed cultists and [[LivingShadow LivingShadows]] that wouldn't look horribly out of place in Origin Systems Inc's other game, {{Franchise/Ultima}}. Even AllThereInTheManual sheds no light on the in-universe origins or plot significance of this place.
* Golden Freddy in ''VideoGame/FiveNightsAtFreddys'' is very different from the four animatronics who try to kill you - he's an empty and discolored Freddy costume who only appears when "summoned" and can only disappear when "unsummoning" him (i.e. changing camera views). Nothing foreshadows him, he is never explained, and if he kills you, the game ''outright crashes''.
* "VideoGame/{{Pikmin}}": There's an enemy that appears in only one dungeon, and it's never really explained where it comes from (the ship says it might have come from another dimension). This enemy is the Waterwraith.
* ''VideoGame/YuGiOhReshefOfDestruction'' has the Chevaliers. In their introduction, they simply say that Master Chevalsky turned them into what they are. That's all you get from them, and that makes them even more creepy.

[[folder:Non-video game Examples]]
* ''Roleplay/DestroyTheGodmodder'': Almost every boss that ever pops up. The paradox monster, the grandmatriarch army, Lord Helix...
* A musical example: Music/ElioELeStorieTese's song "[[http://www.youtube.com/watch?v=7x2_c22UsTI Supermassiccio]]" is actually ''about'' Giant Space Fleas from The Future that came out of a black hole. No, it's not supposed to make any sense.
* In ''{{Naruto}}'', after 200 chapters of war against Madara ([[spoiler:both the real and fake one), Kaguya Otsutsuki, an in-universe ''mythological'' character who was first mentioned and not even hinted at until about 650 chapters into the story and is supposed to be ''dead'', reveals herself as the true villain behind everything, less than 20 chapters after her first mention. Kishimoto ''tried'' to justify it by revealing that ''Black Zetsu'' was manipulating the entire world in order to revive her, with many of his actions causing the most pivotal events in ninja history, but it didn't make it feel any less of a copout.]]
* In YuGiOh, after building up Malik as the Big Bad for Battle City, his dark side takes over and becomes the true antagonist. There was absolutely no foreshadowing and Dark Malik was made into a CardCarryingVillain to make his villainous alter-ego seem more sympathetic.
* DC Comics' ''ComicBook/FinalCrisis'' kept building Darkseid up to be the final villain, but in the end Mandrakk the Dark Monitor showed up out of nowhere to be the real threat.
* In ''{{Homestuck}}'', from the [[OurTrollsAreDifferent Troll's]] point of view, [[RealityWarper Bec]] [[OmnicidalManiac Noir]] is this [[UnwinnableByInsanity to their game of SBURB]]. Especially since [[ItMakesSenseInContext he came from a completely different session of the game.]]
* In the Broadway version of ''[[{{Disney/Tarzan}} Disney's Tarzan]]'', instead of being chased by a group of baboons Jane is captured by a giant spider.
* PlayedForLaughs in ''Webcomic/EightBitTheater'', when the main characters complain that they live in a classic fantasy world and that the Warmech hunting them is completely thematically inappropriate.