History NightmareFuel / TheAdventuresOfJimmyNeutronBoyGenius

* "Sheen's Brain" where Sheen's head [[BodyHorror eventually gets so big it takes over his body]] and he develops psychic powers. And then his voice turns demonic when he starts speaking. Worse, his IQ would keep on growing infinitely until ''[[YourHeadAsplode his head explodes]]''. Sheen also becomes a sociopath and KnightOfCerebus -- to the point where he declares himself a God and nearly kills "Ultra Lord" (actually a disguised Jimmy and Carl), his lifelong idol, for trying to revert him to normal.

** The basic rules of the game show Intergalactic Showdown are that all losing teams have their planets blown up! Worse is host Meldar Prime takes sadistic pleasure in demolishing the losers' planets even more than hosting the game itself. [[FridgeHorror How many innocent planets has Meldar's show destroyed?!]]
** During the race between Jimmy's team and the team of brainy aliens. When it seems like they have made it to the finish line, they return to Retroville and find it completely empty. Then they hear ghostly voices that are haunted and strange in the Candy Bar. Inside the Candy Bar, they are suddenly greeted by their parents (all giving a rather weird smiles with their eyes creepily distorted) with a celebration of their supposed victory. When they find some things off (like the ice cream tasting like sheet rock), the "parents" urged them to "Eat and Forget" repeatedly in an increasingly unsettling manner like zombies. It was all a dream implemented by the brainy aliens to distract them; the only way they could wake up is to fall into the void outside where they find out they are in the middle of nowhere. It could be worse, think about what would have happened if the "parents" had captured the kids.

* In "Who's Your Mommy", Carl gets impregnated by a single alien egg Alien facehugger-style. Jimmy is terrified by the situation and describes how the alien is a glowing mass of energy that could kill Carl via electrocuting him, growing till it splits him in half, or eating his insides once it's born, but everyone else including Carl's parents react with utter joy at Carl's pregnancy. Then the alien behind the facehugger that laid the egg, which happens to look like a giant lightning spewing jellyfish, comes all the way to Earth to look for its baby!

* "The Evil Beneath" has Dr. Sidney Moist, one of Jimmy's scientist role models and leading researcher in phyto-chemicals compounds who was thought long dead. He ends up revealing that he's been kidnapping people who come to the Quadrangle to turn them into Algae-based manservants because of his own psychotic paranoia that newcomers were sent to spy on him. He's done this many times and would have successfully done it to Jimmy and his friends if not for Jimmy finding a way to overload the Algae Men and destroy Dr. Moist's lab. Afterward, a dense fog appears out of nowhere with multiple pairs glowing red eyes inside the fog, and Jimmy and company flee in terror.

* The renegade McSpankeys in "Men At Work". After Hugh causes the restaurant's AI to go haywire, it then comes to life and begins to eliminate all competing restaurants in town. The restaurant's drive-thru speaker head then grows bigger, to where its' face morphs into an angry face, and when it catches Jimmy attempting to bring itself down, its' face grows ''angrier'' and attempts to shoot down Jimmy.
** How it destroys the competing restaurants, by disintegrating the buildings with a gun that spews out an orange acid-like substance. Fridge Horror kicks in as we see customers running away as the restaurant vanishes, meaning there might've been a chance people were still inside the restaurants.

* At one moment in "Monster Hunt", something both cryptic and very unsettling is revealed:

'''Betty:''' ''YOU'' do!\\

** [[DontExplainTheJoke For anyone who's still confused...]] Betty intends on [[TheBait using Jimmy as bait]] to lure out the Lake Monster? [[FridgeHorror A crazy old man was willing to kill a child to catch something that for all anyone could know doesn't even exist.]]

* Paul the chimpanzee from the DNA Productions logo at the end of every episode [[AccidentalNightmareFuel can be unnerving to some viewers]] due to the fact that he has a third eye.

While ''WesternAnimation/TheAdventuresOfJimmyNeutronBoyGenius'' has developed a cult following for its unique animation style and interesting storytelling, those same elements can add some horror to the mix if DNA Productions wanted to.

* Paul the chimpanzee from the DNA Productions logo at the end of every episode [[AccidentalNightmareFuel unnerved a few people]] due to the fact that he has a third eye.
* While "Grumpy Young Men" is a mostly funny episode, the sheer fact that Jimmy, Carl, and Sheen are quickly dying via RapidAging can be unnerving. Jimmy outright says the three of them would continue to age until they were ReducedToDust at 6:03 P.M.… they just barely get back to normal with seconds to spare.

* While "The N-Men" is an awesome homage to the superhero genre, it's when Jimmy [[HulkingOut hulks out]] that the story takes a [[SurpriseCreepy surprisingly shocking turn]]. He did have a [[HulkOut superpower]]. [[OhCrap He just didn't tap into its potential]]. Enraged at all the mockery he got, and the fact that his work on a cure has been undone, he completely '''''[[RageBreakingPoint snaps]]'''''. You get a close-up of his eye, and they turn from InnocentBlueEyes into a [[WhamShot bloodshot bright green]] and his voice drops in octaves. The camera quickly pans as Jimmy's body changes off-screen (but you can see his shadow growing larger and more muscular). You can hear his [[BodyHorror bones crunching and Jimmy sounds like he's under]] ''[[BodyHorror excruciating]]'' [[BodyHorror pain]]. And poor Goddard is ForcedToWatch the whole thing in ''absolute horror''.

** During the race between Jimmy's team and the team of brainy aliens. When it seems like they have made it to the finish line, they return to Retroville and find it completely empty. Then they hear ghostly voices that are haunted and strange in the Candy Bar. Inside the Candy Bar, they are suddenly greeted by their parents (all giving a rather weird smiles with their eyes creepily distorted) with a celebration of their supposed victory. When they find some things off (like the ice cream tasting like sheet rock), the "parents" urged them to "Eat and Forget" repeatedly in an increasingly unsettling manner like zombies. [[spoiler:It was all a dream implemented by the brainy aliens to distract them; the only way they could wake up is to fall into the void outside where they find out they are in the middle of nowhere. It could be worse, think about what would have happened if the "parents" had captured the kids.]]

** [[DontExplainTheJoke For anyone who's still confused...]] Betty intends on [[TheBait using Jimmy as bait]] [[spoiler:to lure out the Lake Monster?]] [[FridgeHorror A crazy old man was willing to kill a child to catch something that for all anyone could know doesn't even exist.]]

* The Nanobots trying to delete everyone from existence due to them being "flawed", thinking they're doing their jobs correctly.

* Jimmy's entire situation in "The Eggpire Strikes Back". Picture yourself in his shoes: you saved your town from an evil alien race some months ago, and they come back for, at first, unknown purposes. Instead of taking over right away, they claim to come in peace and bring everyone gifts, emotionally manipulating the town with their own interests and desires. [[CassandraTruth Despite your efforts to prove their true intentions, the town that you protected starts doubting you as the alien race in question takes it over.]] By the time you finally figure out what it is they're planning (reviving their dead chicken god to feast on the town), you've become a social pariah to everyone, including your best friends, and even your parents are embarrassed of your supposed prejudice. Then the truth comes from the alien leader's mouth: they all want to get revenge on ''you'', the boy that put a stop to their plans the first time. They plan to [[KickTheDog leave you begging and pleading for everyone to believe you about their imminent doom, only to watch helplessly as the people you know and love are devoured one by one, all while your enemies simply laugh at your failure]], all caused because of your heroic actions. That's what Jimmy has to go through; if it wasn't for Cindy [[MyGodWhatHaveIDone realizing she helped the Yolkians with their evil intentions]], this episode would have ended [[KillEmAll quite a bit differently]]...

* While ''"The N-Men"'' is an awesome homage to the superhero genre, it's when Jimmy [[HulkingOut hulks out]] after hitting his RageBreakingPoint is when the story takes a [[SurpriseCreepy surprisingly shocking turn]]. He did have a [[HulkOut superpower]]. [[OhCrap He just didn't tap into its potential]]. Enraged at all the mockery he got, and the fact that his work on a cure has been undone, he completely '''[[RageBreakingPoint snaps]]'''. You get a close-up of his eye, and they turn from InnocentBlueEyes into a [[WhamShot bloodshot bright green as his voice drops in octaves]]. The camera quickly pans as Jimmy's body changes off-screen (but you can see his shadow growing larger and more muscular). You can hear his [[BodyHorror bones crunching and Jimmy sounds like he's under]] ''[[BodyHorror excruciating]]'' [[BodyHorror pain]]. And poor Goddard watches the whole thing in horror, completely and utterly ''terrified'' for his master's well-being.

* "N-Men", when Jimmy [[HulkingOut Hulks Out]] for the first time after hitting his RageBreakingPoint for being apathetically ridiculed '''''by his own friends'''''. At a close up at his eyes as they turn from [[InnocentBlueEyes Innocent Heroic Blue]] to an Angry Bloodshot Green and his voice deteriorates and grows deeper. The camera quickly pans as Jimmy's body changes off-screen (but can see his shadow growing larger and muscular). You can hear his [[BodyHorror bones crunching and Jimmy sounds like he's under]] ''[[BodyHorror excruciating]]'' [[BodyHorror pain]]. And poor Goddard watches the whole thing in horror, completely and utterly ''terrified'' for his master's well-being.
--> '''Jimmy''': ''[growling]'' What's wrong with me. ''[voice deepens]'' Feeling strange... ''[Goddard cowers in fear as he watches Jimmy transform]'' Thoughts cloudy... image of Cindy '''BURNING IN MY BRAIN!!!''' ''[emerging from his lab in hulk form]'' Jimmy ''did'' get super power! Now Jimmy strong! ''[looking at the camera]'' Now Jimmy '''SMASH!!!''' ''[roars as he runs towards the camera]''

* Paul the chimpanzee from the DNA Productions logo at the end of every episode unnerved a few people due to the fact that he has a third eye.

* ''N-Men'', when Jimmy [[HulkingOut Hulks Out]] for the first time after hitting his RageBreakingPoint for being apathetically ridiculed '''''by his own friends'''''. At a close up at his eyes as they turn from [[InnocentBlueEyes Innocent Heroic Blue]] to an Angry Bloodshot Green and his voice deteriorates and grows deeper. The camera quickly pans as Jimmy's body changes off-screen (but can see his shadow growing larger and muscular). You can hear his [[BodyHorror bones crunching and Jimmy sounds like he's under]] ''[[BodyHorror excruciating]]'' [[BodyHorror pain]]. And poor Goddard watches the whole thing in horror, completely and utterly ''terrified'' for his master's well-being.

* ''Win, Lose, or Kaboom'':

* In ''Who's Your Mommy'', Carl gets impregnated by a single alien egg Alien facehugger-style. Jimmy is terrified by the situation and describes how the alien is a glowing mass of energy that could kill Carl via electrocuting him, growing till it splits him in half, or eating his insides once it's born, but everyone else including Carl's parents react with utter joy at Carl's pregnancy. Then the alien behind the facehugger that laid the egg, which happens to look like a giant lightning spewing jellyfish, comes all the way to Earth to look for its baby!

* At one moment in "''Monster Hunt''", something both cryptic and very unsettling is revealed:

--> '''Jimmy''': ''[growling]'' What's wrong with me. ''[voice deepens]'' Feeling strange... ''[Goddard cowers in fear as he watches Jimmy transforming]'' Thoughts cloudy... image of Cindy '''BURNING IN MY BRAIN!!!''' ''[emerging from his lab in hulk form]'' Jimmy ''did'' get super power! Now Jimmy strong! ''[looking at the camera]'' Now Jimmy '''SMASH!!!''' ''[roars as he runs towards the camera]''

* ''N-Men'', when Jimmy [[HulkingOut Hulks Out]] for the first time after hitting his RageBreakingPoint for being apathetically ridiculed by ''everyone'' he's saved countless times, even '''''his closest friends making fun of him'''''. At a close up at his eyes as they turn from [[InnocentBlueEyes Innocent Heroic Blue]] to an Angry Bloodshot Green and his voice deteriorates and grows deeper. The camera quickly pans as Jimmy's body changes off-screen (but can see his shadow growing larger and muscular). You can hear his [[BodyHorror bones crunching and Jimmy sounds like he's under]] ''[[BodyHorror excruciating]]'' [[BodyHorror pain]]. And poor Goddard watches the whole thing in horror, completely and utterly ''terrified'' for his master's well-being.
--> '''Jimmy''': ''[growling]'' What's wrong with me. ''[voice deepens]'' Feeling strange... ''[growing [[HulkingOut bigger]] as Goddard cowers in fear]'' Thoughts cloudy... image of Cindy '''BURNING IN MY BRAIN!!!''' ''[emerging from his lab in hulk form]'' Jimmy ''did'' get super power! Now Jimmy strong! ''[looking at the camera]'' Now Jimmy '''SMASH!!!''' ''[roars as he runs towards the camera]''

* At one moment in "''Monster Hunt''," something both cryptic and very unsettling is revealed:

%% Image selected per Image Pickin' thread: https://tvtropes.org/pmwiki/posts.php?discussion=1495476049035052900
%% Please do not replace or remove without starting a new thread.

* "Sheen's Brain" where Sheen's head [[BodyHorror eventually gets so big it takes over his body]] and he develops psychic powers. And then his voice turns demonic when he starts speaking. Worse, his IQ would keep on growing infinitely until ''[[YourHeadAsplode his head explodes]].'' Sheen also becomes a sociopath and KnightOfCerebus -- to the point where he declares himself a God and nearly kills "Ultra Lord" (actually a disguised Jimmy and Carl), his lifelong idol, for trying to revert him to normal.
* ''Win, Lose, or Kaboom''
** The basic rules of the game show Intergalactic Showdown are that all losing teams have their planets blown up! Worse is host Meldar Prime takes sadistic pleasure in demolishing the losers' planets even more than hosting the game itself. [[FridgeHorror How many innocent planets has Meldar's show destroyed]]?!
** During the race between Jimmy's team and the team of brainy aliens. When it seems like they have made it to the finish line, they return to Retroville and find it completely empty. Then they hear ghostly voices that are haunted and strange in the Candy Bar. Inside the Candy Bar, they are suddenly greeted by their parents (all giving a rather weird smiles with their eyes creepily distorted) with a celebration of their supposed victory. When they find some things off (like the ice cream tasting like sheet rock), the "parents" urged them to "Eat and Forget" repeatedly in an increasingly unsettling manner like zombies. [[spoiler: It was all a dream implemented by the brainy aliens to distract them; the only way they could wake up is to fall into the void outside where they find out they are in the middle of nowhere. It could be worse, think about what would have happened if the "parents" had captured the kids.]]
* ''Flippy''. Hugh purchases a puppet named Flippy to practice ventriloquism, but his comedy routine is lacking, so Jimmy puts a computer chip in Flippy's head to enhance Hugh's brain. Instead, Flippy uses the chip to draw consciousness from Hugh to give himself sentience and become a real person who happens to be malevolent and pretty sociopathic, while Hugh loses his mind and becomes a lifeless empty shell. When Jimmy caught on, Flippy threatened to destroy Hugh's brain, since he controlled Hugh's body. When he gained full sentience, Flippy planned to kill Hugh by chucking his body off a cliff so Hugh couldn't get his brain back. Worse off, even though Jimmy manages to destroy the chip, it's implied in the end Flippy is still alive and still has some control over Hugh's mind.

* "Sleepless in Retroville", where Jimmy, Sheen and Carl have a sleepover with a machine that cranks out scary stories, pillows, and pizzas. The climax is when Carl accidentally creates a flesh-eating pizza monster that chases them around the house, and is able to split into three pizza slices, as well as a pack of pillow monsters that go after Jimmy's parents. At the end after disaster seems to be averted, the pizza monster strikes back - "Haven't you ever heard of sequels?" Then it spirals into a series of nightmares from each of the characters. While most of them are funny, one ends when Carl tries to hide under Hugh and Judy's bed, but gets stuck and is eaten by the pizza slices. ''Yikes''.

'''Carl:''' [[MoodWhiplash Why does the monster go in with the gadgets]]?\\
'''Sheen:''' [[MoodWhiplash No no, the monster goes in with the water]].\\
'''Carl:''' [[MoodWhiplash Our monster]]?
** [[DontExplainTheJoke For anyone who's still confused...]] Betty intends on [[TheBait using Jimmy as bait]] [[spoiler:to lure out the Lake Monster]]. [[FridgeHorror A crazy old man was willing to kill a child to catch something that for all anyone could know doesn't even exist]].

* Jimmy's entire situation in "The Eggpire Strikes Back". Picture yourself in his shoes: you saved your town from an evil alien race some months ago, and they come back for, at first, unknown purposes. Instead of taking over right away, they claim to come in peace and bring everyone gifts, emotionally manipulating the town with their own interests and desires. [[CassandraTruth Despite your efforts to prove their true intentions, the town that you protected starts doubting you as the alien race in question takes it over.]] By the time you finally figure out what it is they're planning (reviving their dead chicken god to feast on the town), you've become a social pariah to everyone, including your best friends, and even your parents are embarrassed of your supposed prejudice. Then the truth comes from the alien leader's mouth: they all want to get revenge on ''you,'' the boy that put a stop to their plans the first time. They plan to [[KickTheDog leave you begging and pleading for everyone to believe you about their imminent doom, only to watch helplessly as the people you know and love are devoured one by one, all while your enemies simply laugh at your failure]], all caused because of your heroic actions. That's what Jimmy has to go through; if it wasn't for Cindy [[MyGodWhatHaveIDone realizing she helped the Yolkians with their evil intentions]], this episode would have ended [[KillEmAll quite a bit differently]]...

* While "Grumpy Young Men" is a mostly funny episode, the sheer fact that Jimmy, Carl and Sheen are quickly dying via RapidAging can be unnerving. Jimmy outright says the three of them would continue to age until they were ReducedToDust at 6:03 PM… they just barely get back to normal with seconds to spare.

* Paul the chimpanzee from the DNA Productions logo at the end of every episode unnerved a few people due to the fact that he has a third eye.

* For some people, the animation in this show counts. Growing up in the early 2000s back when most cartoons used 2D animation, the style seemed creepy and off-putting to some children. Especially the Jimmy-Timmy Power Hours, where characters who had always lived in a 2D world suddenly became computer-generated big-headed kids.

* The episode where the gang goes to Retroland to try to disprove a ghost myth, with different people showing up dressed as the ghost to try to scare them. For the most part, it's funny, but than, at the end, [[RealAfterAll the real ghost appears to Jimmy's parents]], and the episode ''just ends there''. Thankfully, later episodes indicate they somehow managed to escape.

* The episode when Evil Jimmy tricks Jimmy into thinking he's turned good, and creates chaos in the city to distract Jimmy from his real plan, to create a new world that's sapping reality from the Earth, not helping matters is the fact that Clone Earth is every bit as evil as Evil Jimmy is. Jimmy proceeds to reverse the process, presumably killing every one of the billions of evil humans.

** During the race between Jimmy's team and the team of brainy aliens. When it seems like they have made it to the finish line, they return to Retroville and find it completely empty. hen they hear ghostly voices of They hear voices that are haunted and strange in the Candy Bar. Inside the Candy Bar, they are suddenly greeted by their parents (all giving a rather weird smiles with their eyes creepily distorted) with a celebration of their supposed victory. When they find some things off (like the ice cream tasting like sheet rock), the "parents" urged them to "Eat and Forget" repeatedly in an increasingly unsettling manner like zombies. [[spoiler: It was all a dream implemented by the brainy aliens to distract them; the only way they could wake up is to fall into the void outside where they find out they are in the middle of nowhere. It could be worse, think about what would have happened if the "parents" had captured the kids.]]

* "One of Us" can get surprisingly scary at times, especially when Jimmy finds himself alone with his rival/potential love interest Cindy Vortex among a city that's been brainwashed and turned into perpetually happy zombies. The ending's rather intimidating as well: as the grandmother behind the mass mind control, Grandma Taters, boards the mothership, it seems like the episode will only end on a peculiar "WTF" note. Instead, Taters turns around, lifts her glasses to reveal [[BlackEyesOfEvil completely black eyes]], and says "WE'LL BE BACK." in a [[EvilSoundsDeep terrifyingly deep voice]]. And to make matters worse, Grandma Taters returned in a later episode.

** The basic rules of the game show Intergalactic Showdown are that all losing teams have their planets blown up! Worse is host Meldar Prime takes sadistic pleasure in demolishing the losers' planets then hosting the game itself. [[FridgeHorror How many innocent planets has Meldar's show destroyed]]?!

** The basic rules of the game show Intergalactic Showdown are that all losing teams have their planets blown up! Worse is host Meldar Prime takes sadistic pleasure in demolishing the losers' planets then hosting the game itself. [[How many innocent planets has Meldar's show destroyed]]?!
** During the race between Jimmy's team and the team of brainy aliens. When it seems like they have made it to the finish line, they return to Retroville and find it completely empty. hen they hear ghostly voices of They hear voices that are haunted and strange in the Candy Bar. Inside the Candy Bar, they are suddenly greeted by their parents (all giving a rather weird smiles with their eyes creepily distorted) with a celebration of their supposed victory. When they find some things off (like the ice cream tasting like sheet rock), the "parents" urged them to "Eat and Forget" repeatedly in an increasingly unsettling manner like zombies. [[spoiler: It was all a dream implemented by the brainy aliens to distract them; the only way they could wake up is to fall into the void outside where they find out they are in the middle of nowhere. It could be worse, think about what would have happened if the "parents" had captured the kids.]]