History NightmareFuel / Ben10

** It also features a completely naked Argit with nothing over his skin (since the gray covering on his skin is apparently made up of fire-able quills too). He covers up, but not before some poor kid sees him (though the kid thinks he's a hero for taking down one of the mutants).

** Ghostfreak has Ben's head turning into a skull during the first part of the transformation; it's even worst in Alien Force, where we get to see his skin distorting, his claws emerging in a Wolverine-like way from his hands, and his skull making a 180° turn;

** It also features a completely naked Argot with nothing over his skin (since the gray covering on his skin is apparently made up of fire-able quills too). He covers up, but not before some poor kid sees him (though the kid thinks he's a hero for taking down one of the mutants).

Let's face it, a [[WesternAnimation/{{Ben 10}} meta]][[Ben10AlienForce -series]] [[Ben10UltimateAlien about]] [[Ben10Omniverse Aliens]] ''has'' to involve some horror at some point.

Let's face it, a [[WesternAnimation/{{Ben 10}} meta]][[Ben10AlienForce -series]] [[Ben10UltimateAlien about]] [[Ben10Omniverse Aliens]] ''has'' to involve some horror at some point.

** ''Outbreak'' puts it further with him. Two words : [[MagmaMan Pyronite]] [[BadassAbnormal Psyphon]].

* Eon in his first appearance was damned ''creepy.'' What do you do when a TimeMaster doesn't like you? [[DoctorWho Basically, run]]. His time ray causes RapidAging, and the first guy we saw him used it on looked like a half-decomposed corpse... and was still alive. His body had become so brittle that at one point, a not-very-hard touch causes the guy's arm to break off (and we learned his ability to feel pain was very much intact.) You probably sighed with relief when the poor guy [[AlmostDeadGuy finished his exposition]] and died. There's also the way he stalked Ben: staying out of step with reality, he could follow Ben anywhere unseen. You know that weird little blur in your class picture? That's him. Watching you. It's hard to describe, but the handling of him when he'd approach Ben was more like a horror movie's supernatural foe than one of Ben's standard enemies. Also, when he's around, ''no one'' can help Ben, because Eon is fond of TimeStandsStill. You and a bunch of heavily armed Plumbers are getting ready to show this guy who's boss... and suddenly Robert Picardo starts to talk... very... slowly. Then you're the only one moving... you, and the guy responsible for the most FamilyUnfriendlyDeath in franchise history, who hasn't done it to you ''yet'' because he ''needs'' you, and who's been looking over your shoulder at school and at home and ''everywhere.'' Unlike Vilgax or Diagon or any other BigBad, there's not an alien in Ben's arsenal[[hottip:*:Okay, he'll eventually get Clockwork.]] that makes Eon less of a threat. Every time Ben encountered him - and all the times Ben had no idea he was there - Eon could have killed Ben at his leisure and there'd have been nothing Ben could do. His plan needed Ben alive and that's why Ben is still here.

* Ghostfreak comes back, and now possess additionnal, new powers. He is somehow able to provoke a mass-possession of his own, turning all inhabitants of Vilgax's home planet into his minions as part of his HiveMind. The planet is then infested in a [[{{Aliens}} Xenomorphesque]] way, with cocoon all over the place. It gets so bad that Vilgax went as far as ''ask Ben's help''.

* The Psycholeopteren whose DNA Khyber was taking is kinda hardcore. It makes you see your fondest desire, but it is a predatory beast. Most LotusEaterMachine scenarios give you a long time to realize the world's wrong and marshal your HeroicWillpower, or your friends come and rescue you, or something. This thing, you've got about five seconds in la-la land before this thing ''eats you.'' And just think, ''aliens use this thing as a GRatedDrug.'' If it's improperly contained, enjoy your DarwinAward.

** The ending of that episode makes you think Simian was dissolved with highly corrosive acid, Later subverted when he returns unscathed in ''Ultimate Alien.''
* The first episode involving the Inkursians shows us their emperor disintegrating his own lieutnant ''on-screen'' because [[YouHaveFailedMe he failed to find his daughter.]]

* In ''Save the Last Dance'', Big Chill keeps possessing Ben and making him act ''very erratic''. When Ben tried to turn into another alien, he transformed into Big Chill, his eating habits and personality go 180--Ben acts much nicer toward Kevin and was shown eating through 2 pickle jars (juice and all) and Big Chill took over Ben to transform. The similarities to Ghostfreak was ''very'' frightening [[spoiler: even as it's revealed that Big Chill was doing that so it could ''reproduce.'']]
* ''Time Heals'' gives us an Alternate Future where Hex and Charmcaster killed Gwen and took over the world. While the scene of Bellwood being invaded with Charmcaster's golem is bad enough, we also get to see what they did to the two other heroes: Kevin was forced to absob the substance the golem were made of, resulting in him becoming Charmcaster's personnal slave. As for Ben, we get to find him in jail, in his Spider-Monkey form.... suggesting they were [[AndIMustScream keeping him alive and forcing him to shapeshift just so they could torture him in his various forms]].

Let's face it, a [[{{Ben10}} meta]][[Ben10AlienForce -series]] [[Ben10UltimateAlien about]] [[Ben10Omniverse Aliens]] ''has'' to involve some horror at some point.

** Even worst in "Gwen 10", where it's made clear he doesn't ''need'' to cut Ben's (or in this case Gwen's) arm to get the Omnitrix. He just prefers doing it that way because it's [[ForTheEvulz more fun for him...]]

Let's face it, a [[{{Ben10}} meta]][[Ben10AlienForce -series]] [[Ben10UltimateAlien about]] [[Ben10Omniverse Aliens]] ''has'' to involve some NightmareFuel.

** Well, when you undergo plastic surgery via the hand of someone best described as an [[TheIgor Igor]] {{Expy}}, there's bound to be a line that gets crossed... namely, Gwen catching the leftover scent of the man's ''blood'' in the operating room. We get a GoryDiscretionShot, of course, but the cast knew he'd gotten a back-alley surgery because there was just that much blood left over. (As for the good doctor? We find ''him'' in a freezer case, quite dead.) There are a lot more deaths kept offscreen. The NightmareFuel pages sometimes suffer from EmphasizeEverything, but the entire episode was ''incredibly'' dark. And ''Omniverse'' hints that he might still be out there. (Of course, as a LighterAndSofter series, he'll probably be more like his first appearance than his second if he does. Then again, ''Omniverse did'' give us [[VileVillainSaccharineShow Malware]].)

** Then it turns out his powers allow him to copy Ben's powers by absorbing energy from aliens, resulting in some scene into large BodyHorror; his final mutation in "Framed" is one of the creepiest scene in the show, especially since we can feel the pain he goes through.

** Well, when you undergo plastic surgery via the hand of someone best described as an [[TheIgor Igor]] {{Expy}}, there's bound to be a line that gets crossed... namely, Gwen catching the leftover scent of the man's ''blood'' in the operating room. We get a GoryDiscretionShot, of course, but the cast knew he'd gotten a back-alley surgery because there was just that much blood left over. (As for the good doctor? We find ''him'' in a freezer case, quite dead.) There are a lot more deaths kept offscreen. The NightmareFuel pages sometimes suffer from EmphasizeEverything, but the entire episode was ''incredibly'' dark. And ''Omniverse'' hints that he might still be out there. (Of course, as a LighterAndSofter series, he'll probably be more like his first appearance than his second if he does. Then again, ''Omniverse did'' give us Malware.)

*** And it's also a traumatic experence for Ben. It filled him with such rage that he actually ''killed Malware'', (though he survived.) It also left him traumatized to the point where he won't even talk about Feedback in the present time.

** ''Showdown'' also finally shows Malware killing two Galvan guards onscreen, [[spoiler: and the end of the same episode has Malware seemingly entering OmnicidalManiac territory by ''destroying Galvan B.'']]

** The alien whose DNA Khyber was taking is kinda hardcore. It makes you see your fondest desire, but it is a predatory beast. Most LotusEaterMachine scenarios give you a long time to realize the world's wrong and marshal your HeroicWillpower, or your friends come and rescue you, or something. This thing, you've got about five seconds in la-la land before this thing ''eats you.'' And just think, ''aliens use this thing as a GRatedDrug.'' If it's improperly contained, enjoy your DarwinAward.

** And we finally find out ''why'' Ben's so afraid of Malware. [[spoiler:He painfully tore Feedback out of the Omnitrix and destroyed him]]. As if that weren't bad enough, there's how he did it. [[spoiler:Red lines spread over feedback before he's torn out, hanging limply in Malware's hand before Malware ''causes him to wither and disintegrate into dust right in front of Ben!'']] So on top of all the ''other'' reasons this guy is so scary [[spoiler:Ben knows he can destroy his aliens in a horrific fashion if he ever gets the chance.]] No wonder Ben's scared of him.

** That same episode gives us Toepick, one of Ben's aliens. At first it seems to be an ordinary alien with a helmet. [[PleaseKeepYouHatOn Then the faceplate opens, revealing it's horribly grotesque face]]. [[TakeOurWordForIt We're never shown its face]], but if Psyphon's screams of terror are any indication, it's better if we didn't.

** That same episode gives us Toepick, one of Ben's aliens. At first it seems to be an ordinary alien with a helmet. Then the faceplate opens, revealing it's horribly grotesque face. We're never shown its face, but if Psyphon's screams of terror are any indication, it's better if we didn't.