!'''As a NightmareFuel page, all spoilers are unmarked [[Administrivia/SpoilersOff as per wiki policy]]. You have been warned.'''
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/girl_dead_6162.jpg]]
[[caption-width-right:350:"I'm dead because of '''YOOOOOUUUUUU'''!"]]

While ''WesternAnimation/{{Metalocalypse}}'' is known for its [[BloodyHilarious gory]] and brutal BlackComedy, [[NightmareFuel it's very much]] '''[[NightmareFuel not]]''' [[NightmareFuel for the faint of heart]]. Some of the subject matter the show covers is a lot more unsettling than you'd expect from an over the top send-up of heavy metal culture, and gruesome imagery is never shied away from. It reaches the point where you'll probably be horrified as often as you're laughing at the chaos that unfolds onscreen.

Spoilers beyond here.
----

* Facebones. Normally, he's just a mildly goofy and gory mascot/caricature Dethklok uses to make their informational videos... then you see the Mordhaus Tours reel on the Season 1 DVD Extras. When he takes you down to the secret basement hallway where the Jomfru brothers were, uh..."dealt with", he starts up laughing. [[EvilLaugh Maniacally.]] Made all the more creepy by the fan theory that Offdensen/Charles is the one who does the in-universe voice for Facebones, possibly as an outlet for the frustrations of his job.
* The part in the second episode of the second season where the prisoner from Die-For-Dethklok.com ''uses half of his dead brother's face'' as a mask for a teenager. It's pretty goddamned disturbing.
* The last stretch of "Snakes and Barrels", where the titular band has a freak-out. It's mostly pretty standard stuff for the show... right up until the part with a thousand angry aborted babies, which feels like something out of a horror movie. And what's the source of the freak-out? Pickles and Snakes n' Barrels unknowingly consume a mind control drug that renders whoever consumes it insane. Pickles' immunity to drugs means it doesn't really affect him at all. Snakes n' Barrels, on the other hand... well, let's just say that they wound up clawing their eyes out and throwing up acid blood.
* The ending of "Dethfashion" is one of the few moments that's too brutal, [[EvenEvilHasStandards even for Dethklok]]. They see the already creepy fashion designer at work skinning a dozen models alive to make his "leather".
* The ending of "Dethecution" where the escaped child murderer [[EatsBabies prepares to eat a baby]] with a knife and fork. We never actually see it, [[NothingIsScarier which honestly makes it even worse]]. He's the Trope Image for IAmAHumanitarian for a ''very good reason''.
* A lot of "Snakes 'n' Barrels II" is even more horrific than the first part:
** Toki ''beating an obnoxious fan to death with his bare hands'' is easily one of the most visceral and unsettling things shown in the entire series. He's normally the friendliest and gentlest member of Dethklok, but this moment is a spine-chilling reminder ''why'' he's in the band. The entire thing is highlighted by the fact that Nathan, Skwisgaar, and Murderface all witness this, [[BewareTheNiceOnes and they look fucking terrified of Toki]]. [[https://youtu.be/80IORg9r6Ek Watch for yourself.]]
** The recently rehabilitated [[MonsterClown Dr. Rockso]] appearing on stage, absolutely high and announcing his comeback in a very scary [[https://www.youtube.com/watch?v=80IORg9r6Ek manner]].
--> '''Dr. Rockso''': I'm b-b-b-b-b-back, baby! The name's Doctor Rockso, the rock n' roll clown! And I ''do cocaine''!
** Rikki Kixx strangling his assistant after delivering his MotiveRant, as the assistant [[HeKnowsTooMuch now knew too much about Rikki’s plan]]. And unlike most deaths in the show, the assistant’s death is far more slow and drawn out, making it incredibly nerve-wracking to watch.
* The infamous ending of "Dethkids", where Toki finds the LittlestCancerPatient dead and starts hallucinating her decaying maggot-filled body yelling in a shrill voice that he killed her as he screams in horror. It even provides the page image.
* The episode "Dethealth" contains a scene where the band members decide to [[FacePalm drink bleach]] in order to falsify the results of a urine test. The NightmareFuel comes into play when Nathan has a hallucinatory episode featuring a beautiful yet inhuman woman who exchanges kisses with him. After she pulls back her face morphs into a horrific visage complete with rotting teeth and a skeletal nose. Nathan's face then begins to rot in a likewise manner ending with his gangrenous lower jaw falling into the tooth filled water below. We can't blame him when he wakes up screaming in horror.
* [[BigBad Mr.]] [[HumanoidAbomination Salacia]] in general.
** At the end of season one, he decapitates Crozier's troops with bass music and then causes Ravenwood's eyes to explode and then strangles him ''with his own intestines''.
-->[[{{EyeScream}} "Be blind"]].
** In season two, after Mordhaus is attacked, Vater Orlaag shows up with a [[MemeticMolester Rape Face]] before Crozier gets {{mind rape}}d by Salacia again.
** Season three ends up showing what Offdensen saw of Salacia's demonic nature.
** His true form towards the end of season 4 is even creepier. He now has razor sharp teeth, an otherworldly glow, a voice of legion and is floating. He even uses telekinesis to nastily kill [[CoolOldGuy Roy Cornickelson]] for getting in his way.
* "Burn the Earth" is possibly the most unsettling of the music videos. The song itself is very dark and threatening but unlike most songs on the show, mostly lacks BlackComedy. The sequence itself mostly depicts TheVirus causing the world to decay graphically.
** Another contender for that title is "Briefcase Full of Guts", which is about an salesman who goes around disemboweling fellow employees to maximize his profits. The {{Gorn}} nature of that premise is bad enough, but it becomes more surreal when [[BattleInTheCenterOfTheMind he fights his inner demon]], before cutting back to reality to reveal that he was killing himself.
* The results of [[ButtMonkey Murderface's]] painfully plastic surgery from "Dethvanity" (fortunately it doesn't last). Instead of becoming handsome, [[NightmareFace his face got infected and becomes hideously deformed]].
* The hideous BlobMonster that the miserable married couple transform into in the music video in "Dethwedding." It's a giant, twitching lump of flesh covered in its own blood and vomit, and at one point it [[ChestBurster rips itself open]] and more of the aforementioned angry aborted babies fly out.
* ''The Doomstar Requiem: A Klok Opera'' has plenty of this:
** Just about any part with the Masked Assassin, especially the first scene where we see [[spoiler: Toki and Abigail's imprisonment]]. After years of being on the show, [[Music/CannibalCorpse George 'Corpsegrinder' Fisher]] finally gets to cut loose, and it's just as horrifying as you've imagined.
** The Depths of Humanity. Everyone Dethklok has left behind on their rise to power has gathered there, and they are more than happy to put Dethklok through the guilt wringer. [[spoiler: Only Skwisgaar holds it together long enough to find what they need and escape. Nathan is reduced to screaming, Pickles can't stop saying [[BigNo no]] over and over, and Murderface gets straight up [[MindRape hypnotized]].]]
** [[spoiler: Ishnifus Meaddle's crucified body after MMA decapitates him. Some Revengencers can be seen huddled underneath the body ''eating his remains.'']]
----