History NightmareFuel / InvaderZim

* The ''whole goddamn entirety'' of "Dark Harvest!" For context, Zim goes on an organ-stealing rampage at Skool to make himself seem more human so Dib won't expose him. That catch is that Zim doesn't just steal people's organs, he ''replaces'' them with random objects. Here's the list: a liver replaced with a technologically advanced necklace functioning as a hall pass that Miss Bitters has already specified will explode if the student leaves campus, a brain replaced with a can of soda so the poor receptionist can only foam at the mouth, and one boy has an unknown organ replaced with ''a motherfucking radiator that was used as an auxiliary hall pass''. Other kids in the cafeteria have random objects in place of their other organs and bones. Gaz's beloved game console is implanted into her side and she's still playing it, and Dib has his lungs replaced with a cow sounder that made the school nurse think he isn't human from the mooing noises he makes.

* The unaired episode "Ten Minutes Till Doom" is pretty darn unsettling, from the revelation that Irkens will die if they are disconnected from their PAKS for more than ten minutes (complete with Zim's body starting to shut down throughout the episode) to Zim's PAK corrupting Dib's mind into believing he himself is Zim. Even worse is that this episode was originally pitched as the series finale [[KilledOffForReal with BOTH Zim and Dib dying]] until ExecutiveMeddling stepped in.

** GIR starts ruthlessly hunting Zim throughout the library with every intent of killing him "for the good of the mission". He's only stopped when a police officer that Zim brainwashed into thinking that he's a squid manages to shoot out ink, blinding GIR and allowing Zim to gets the behavioral modulator out of GIR's head and turn the dial, restoring GIR to his normal self.

** It can be a little unnerving to see the normally ultra-energetic GIR [[UncannyValley lifeless and blank-eyed]] after his brain gets transferred into the computer in "Invasion of the Idiot Dog Brain."

* The unaired episode "Ten Minutes Till Doom" was pretty darn unsettling, from the revelation that Irkens will die if they are disconnected from their PAKS for more than ten minutes (complete with Zim's body starting to shut down throughout the episode) to Zim's PAK slowly corrupting Dib's mind into believing he himself is Zim. Even worse is that this episode was originally pitched as the series finale [[KilledOffForReal with BOTH Zim and Dib dying]] until ExecutiveMeddling stepped in.

* "Gaz: Taster of Pork". When Dib confronts Gaz while she's in quarantine, she straight up becomes a demon. She begins to levitate while [[SupernaturalIsPurple purple light]] shines down on her, red flames begins to encircle and trap Dib in, her body becomes a silhouette with nothing but [[RedEyesTakeWarning her eyes]] glowing, and to top it all off she gives Dib this little message:

* Mrs. Bitters is Nightmare Fuel on her own as she frequently belittles her students, revolves the lessons she teaches around fear and pessimism, and she sometimes punishes misbehaving students in harsh ways like forcing Dib to use a tiny sponge to clean up a gargantuan mess at the end of "Rise of the Zitboy".

[[caption-width-right:350:''EyeScream'', you scream, we all scream for one of the most [[SarcasmMode family-friendly]] Franchise/{{Nicktoons}}!]]

''Invader Zim'', despite not lasting that long, managed to create so many horrific moments for a children's show that it's widely agreed to be the ''darkest'' cartoon Nickelodeon has ever created. Many episodes are so horrifying that it's a miracle that they even aired at all. What do you expect when you get the creator of a [[ComicBook/JohnnyTheHomicidalManiac comic in which the protagonist is a serial killer]] to make a kids show?

** Let's not forget about the ending to that episode, where [[spoiler: it turned out that millions of years from the episodes events, Zim's haywire Santa suit terrorizes the earth every Christmas and has to be placated with milk and cookies.]]

''Invader Zim'', despite not lasting that long, managed to create so many horrific moments for a children's show that it's widely agreed to be the ''darkest'' cartoon Nickelodeon has ever created. Many episodes are so horrifying that it's a miracle that they even aired at all. What do you expect when you get the creator of a [[ComicBook/JohnnyTheHomicidalManiac comic where the protagonist is a serial killer]] to make a kids show?

** There's the subtle creepiness of the fact that Dib [[WhatTheHellHero willingly used his sister as a guinea pig for the spell]], and she was left only being able to taste one kind of food. Worse, she was forced to undergo hours, if not days or weeks, of forced confinement and invasive experimentation by her scientist father in a futile effort to cure her. No ''wonder'' she subjected Dib to such a horrible fate.

** GIR starts ruthlessly hunting Zim throughout the library with every intent of killing him "for the good of the mission". He's only stopped when Zim gets the behavioral modulator at the last second and turns the dial, restoring GIR to his normal self.

* Pretty much the entire show, really. It's odd to think that the only real difference between this universe and the ''TabletopGame/{{Warhammer 40000}}'' universe is that in this one, Earth isn't strong or competent enough to repel an invasion, let alone ''realize'' that one is even happening.

* Pretty much the entire show, really. It's odd to think that the only real difference between this universe and the ''TabletopGame/{{Warhammer 40000}}'' universe is that in this one, Earth isn't strong enough to repel an invasion.

''Invader Zim'', despite not lasting that long, managed to create so many horrific moments for a children's show, that it's widely agreed to be the ''darkest'' cartoon Nickelodeon has ever created. Many episodes are so horrifying that it's a miracle that they even aired at all. What do you expect when you get the creator of a [[ComicBook/JohnnyTheHomicidalManiac comic where the protagonist is a serial killer]] to make a kids show?

''Invader Zim'', despite not lasting that long, managed to create an incredible amount of horrific moments for a children's show, and as such, is widely agreed to be the ''darkest'' cartoon Nickelodeon has ever created. Many episodes are so horrifying that it's a miracle that they even aired at all. What do you expect when you get the creator of an incredibly violent and scary [[ComicBook/JohnnyTheHomicidalManiac comic book]] to make a kids show?

* The sheer level of stupidity of every single human except Dib, Gaz and Professor Membrane, and even Dib and Professor Membrane have their moments. "Door to Door" shows a few people who seem kind of normal, but basically everyone is TooDumbToLive... incidentially, "Door to Door" also presents "candy" made of ''sawdust''. It's far from the only indicator human society of the setting just seems to have gone completely insane.
* Mrs. Bitters is Nightmare Fuel on her own as she frequently belittles her students, revolves the lessons she teaches around fear and pessimism, and she sometimes punishes misbehaving students in harsh ways like forcing Dib to use a tiny sponge to clean up a gargantuan mess at the end of Rise of the Zitboy.

** The cherry on top of this one goes to the very end where we only see the door to the Shadow Hog's bathroom while Dib is brokenly apologizing while gagging and possibly crying. The fact that both Gaz and Membrane know where he is at that point, what is happening, and don't care at all just makes it worse.

** As an added bonus, as Dib was never aware of the situation he was in it's safe to assume that Zim kidnapped Dib then hooked him up to the machine.

-->'''GIR:''' You are no commander! You are a threat to the mission! Your methods are ''stupid!'' Your progress has been ''stupid!'' Your intelligence is ''stupid!'' For the sake of the mission, you must be '''terminated!'''
** GIR starts ruthlessly hunting Zim throughout the library with every intent of killing him "for the good of the mission". He's only stopped when Zim gets the behavioral modulator at the last second and turns the dial, restoring GIR to his normal self.

* GIR going on a vicious rampage in "GIR Goes Crazy And Stuff"

** FridgeHorror arises in the episode once one realizes that Dib is sent to life in an insane asylum, only busts out thanks to his trips to the Nightmare World, and apparently, the Skool has normalized such an occurrence with aptly named, "Crazy Cards". Maybe Earth ''is'' better off in the hands of the Irken Empire.
** Pretty much everything in that episode, really. To the point that Jhonen has said that he has no idea how any of this managed to get on the air.

* ALL of the head tumors in this show.
* "Oh, yeah... We used to have a puppy, didn't we?"
** Doubles as FridgeHorror when you consider GIR finding the aforementioned nearly-dead dog!
* "We'll have to confiscate your retinas!"
* Zim's eyes bubbling and burning as he stares at the sun. Presumably, only his contacts were burning, but from the sound of his dialogue and his pained screams... *shudder*
** ...because [[EyeScream burnt plastic on your cornea]] is somehow better.
** [[NightmareRetardant Of course, "THEY'VE BOOBY-TRAPPED THEIR SUN SOMEHOW!" is comedy gold.]]

* In the Halloween episode, that [[JumpScare surprise shot]] of that hideous monster with those big eyes during Dib's "crazy house" bus ride? Not to mention that everything in Nightmare World is actually just a figment of Dib's imagination. How ''damaged'' do you have to be to come up with the abominations that lurk inside of Dib's mind?

** And let's not forget about the exploding hall pass. Since it was put inside that hall monitor's body, what'll happen to him when he has to go back home? Will the hall pass explode while it is inside him?