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Nightmare Fuel: Adventure Time

"Just talked to the creator of Adventure Time, Pendleton Ward (@buenothebear). He said that he'd be happy if the show gave people nightmares."
Tweet by Matt Fowler

Adventure Time is a very strange show. The creators can use this to their advantage and show some truly terrifying stuff.


    open/close all folders 

    General 
  • The Lich. There's a reason he provides the page image here. For the horrific details, see the ends of the folders for Seasons 2 and 4 and the beginning of Season 5.
    • However the episode itself reveals he was created BY the Mushroom War, spawning out of the radioactive waste at the center of a nuclear explosion. No wonder he's so scary.
  • Ricardio in general. An Ax-Crazy, obsessed little creep with many Nightmare Face moments and who uses pretty nasty and evil means to achieve his goals and marry the Bubblegum Princess. The most disturbing of all is that, he is very suggestive of a rapist. In a kid's show.
  • Lemongrab is a generally frightening individual when he's mad, and his Ax-Crazy behaviour is very disturbing.
  • The Complete Season DVDs, which each basically depict every layer of a certain character's head. Season One goes from Finn's hat, through his hair, muscles, skull and brain...Since the Complete Season Blu-Ray Discs have only one disc each, the dissection stops at the skull.
  • The fact that Simon went completely insane and gained treacherous ice powers just by wearing a crown. Wearing it once made him unable to get rid of it in the first place, too.
    • The Complete Second Season DVD adds a little insight into this. Like the example with Finn above, the case and DVDs dissect the Ice King's head. The very last DVD shows the crown sitting upon Simon's completely frozen brain.
    • The fact that his final progression to the Ice King happened while effectively raising Marceline-who was a little girl at the time. Simon's ice powers and insanity are terrifying enough, but the fact he has to keep a child safe is scary on a whole other level.
  • Sometimes Jake's shape-shifting ability gets a little disturbing.
  • The Official Adventure Time Encyclopaedia, the last chapter, they filled it with as much creepypasta as they possibly could. The Chapter is called "If you read this you will die" for a reason.
  • In The videogame "Explore The Dungeon Because I Don't Know" it is revealed at the beginning that Princess Bubblegum locks all the criminals of the Candy Kingdom in her Dungeon "FOREVER!!!" if you thought her mental state was unnerving before, this seals it.
    • Also the fact the dungeon has characters that wouldn't really be considered "Criminals" more like savage monsters. Such as Giant Oozing tentacles, Hugwolves, More Deer like the one from season 3, even the Demon Cat from "Dungeon" somehow made it down there, plus many many more abominations of nightmares. Imagine being trapped down there until you die with all these things running around. Lemongrab's dungeon from "Hey Ice King Why'd You Steal Our Garbage?" which was just a simple jailcell is looking nicer and nicer isn't it?
      • By this logic, this makes Lemongrab giving people twelve years dungeon, thirty years dungeon, or fifty years dungeon seem downright reasonable. To be fair to PB, they weren't serious offenses to get a million years dungeon.
  • The second Adventure Time video game, "Explore The Dungeon." What Princess Bubblegum did to the Lemongrabs. Plus their screams of agony. "WHY DO YOU TAUNT US?!" Geez... very dark...

    Season 1 
  • "Slumber Party Panic", which is about candy people turning into zombies after Princess Bubblegum tries to bring them back from the dead. Its third season sequel is even worse.
  • Ricardio not only threatening to cut out Princess Bubblegum's heart out, then showing a horribly grotesque detailed close-up of his face and having him say "And make out with it" with creepy opera music playing in the background.
    • The scenes of the Ice King with no heart. Sure- he's a jerk and he starts off as a harmless villain in the series, but he didn't deserve to be treated so horribly by Ricardio. He's too much of a woobie. The fact that the Ice King explicitly stated that Ricardio threw him in a dumpster and left him for dead really shows us just how evil Ricardio actually is.
    • Also in the episode, Princess Bubblegum is shown to enter the party from a dungeon hidden by a bookshelf. Complete with a once-prisoner-turned-skeleton.
    • One of the worst parts had to be the fact that was that Ricardio was going cut out Princess Bubblegum's heart using broken glass bottles.
  • "When Wedding Bells Thaw" was the only episode where the Ice King is not only evil, but downright diabolical. He doesn't just kidnap a princess, stick her in a cage, and marry her against her will. He actually BRAIN-WASHES a princess and forces her into WANTING to marry him! That poor old lady princess... She was so terrified she was actually crying. And the way she was so angrily protesting as the Ice King lowered her down. . . We all know that the Ice King isn't a bad guy- he's a Jerkass Woobie, but this moment very well could have been his moral event horizon, if he had continued in this direction.
  • "Freak City". Magic Man. One of the first things he does is magically turn a bird inside out. The worst part about the inside-out bird is that it doesn't die. It flops around on the ground for a little bit and struggles to get away - a true Fate Worse than Death if there ever were one. You know an animated series is gold when you, a grown-ass adult, have nightmares about its Q analogue.
    Jake: Think happy thoughts - little cute bees, little babies, tiny tiny bunnies
  • "Dungeon" had plenty.
    • Finn's "guardian angel" is horrific, mainly because the sudden change from cute to scary can catch you off guard. She also says something along the lines of "I'm going to cook you and eat your flesh" before showing off her... disgusting face?
    • Demon cat thing! Sure, his knowledge of "almost everything" was rather great, but something about his voice and composure...
      Cat: "I am going to unzip your skin and wear it like a little coat." Also, "I have approximate knowledge of many things. For instance, I know that I am possibly going to slay you, and munch on your eyeballs."
    • The angry face Princess Bubblegum made at the end.
  • Ocean Of Fear: "Ready for step two?"
    • The whole episode made "exposure therapy" look absolutely hellish.
    • Hell... The artists managed to make the ocean itself look absolutely terrifying!
    • The fact that the Fear Feaster's face is at times reminiscent of Red from NES Godzilla Creepypasta is NOT helpful at all.
  • Princess Bubblegum going a bit Axe Crazy when she thinks the Duke of Nuts has thrown a bottle at her to make her turn green and bald. She's actually legitimately terrifying with her maniacal raving about what she's going to do to him when she catches him.
  • If you thought this show was scary so far, wait until you see the original artwork for the title card of "The Enchiridion". It is absolutely horrific, and comes with a very necessary warning. Hell, it borders on Nausea Fuel!

    Season 2 
  • Pen Ward warned that "It Came From the Nightosphere" would be filled with this. And rightfully so!
    • Marceline's Dad. A soul-sucking malevolent Eldritch Abomination who shows his innards to other people for fun. His voice is creepy. He sounds like a pretty average, nice man. Definitely not the voice you'd expect from such a character. Also when he turns to the Ice King and although we can't see it that well, his face basically EXPLODES.
      • Perhaps it's the more subtle things that make Marceline's Dad creepy- like the way he walks. His gait is like a mix of a creeping spider and an Uncanny Valley marionette.
      • Word of God states that he pretty much represents Satan in this show.
    • Marceline looked pretty scary whenever she had red eyes and sharp claws.
  • In "The Eyes," you can see a tiny, skeletal figure next to Finn and Jake's window, hanging itself.
  • Both "Belly Of The Beast" and "The Limit" have their moments:
    • "Belly of The Beast"
      • Just the knowledge that a whole cave's worth of party-happy bears could be swallowed and be completely oblivious to the fact for three whole days, continually partying for those three days without stop for rest, personal need, or food, is pretty unnerving.
      • Cubby's reaction to his/her father yelling at him/her for, what he thought, was bothering Finn and Jake with "his nonsense about being inside a monster's stomach". He was obviously frightened for his life.
    • "The Limit":
      • Jake's reaction to being put under peer pressure- it nearly stretched him to oblivion!
      • The snake-genie at the end of the labyrinth. Creepy tone of voice, and way too sadistic for a children's show.
  • The Royal Tart Toter. He's insane, uncanny valley, has deranged eyes, foaming at the mouth and everything.
  • The torture the gnomes put Finn through in "Power Animal".
    • The very last line of that episode.
    Jake: Let's go eat Cinnamon Bun.
    • The way the gnomes seem to give off vibes of pedophilia, especially when they make Finn pole dance!
  • Much of "Susan Strong". Susan going completely manic, and her gathering up her hyoomans to eat everyone in the Candy Kingdom, (except for red stripe man.)
    • Jake's scary line: "We could rule them like gods! *squints eyes, rubs hands, talks in low, soft voice* Angry gods..." Of course, Jake was kidding, but the way he said that line was insanely creepy.
  • Peppermint Butler in "Death In Bloom".
    "I'd like your flesh."
    "Hehehehehe... Stop bein' silly, Peppermint Butler!"
    • The fact that he knows how to enter the realm of the dead and is good friends with Death himself is more than a little disturbing.
    • Plus the quick scene in the season finale where he brings tea to a Lich-possessed Princess Bubblegum and upon catching sight of her sprouts fangs and hisses like a cat before running away on all fours. What the hell is that guy?
    • Apparently, Peppermint Butler is also a friend of Hunson Abadeer, which is horrifying in of itself. In the background of Return to the Nightosphere is a picture of them playing golf. Keep in mind, the Nightosphere is meant to represent Hell and Hunson is meant to represent the devil.
    • He also gets very nervous in You Made Me when Finn wants to see Peppermint Butler's aura.
    Peppermint Butler: "No, you don't want to see that!"
  • All of the scare chords in "Mystery Train," in addition to the atmosphere in general, the lighting, the creepy conductor, and the horrifying ending.
    • The train falls off an open cliff and lands on a gelatin person. Jake says that this wasn't planned, and he was the one who arranged the train ride for Finn. The ending seems to suggest that Jake knew this the whole time and either he or the designer of the train tracks was planning to commit a mass murder-suicide.
      • Please, didn't you ever think that train was supposed to stop near the end of tracks so that everyone could use some kind of safe way to get down and the joke just got a bit too far? Especially since it would have been able to stop if not for Finn damaging the controls in the fight Nice Job Breaking It, Hero (Almost)
    • Marceline's ghost friends are a little bit terrifying in their Comedic Sociopathy. Marceline tricks Finn and Jake into thinking she's turned them into vampires, and has them do ridiculous things as "vampire training." The ghosts claim that Finn and Jake being kicked repeatedly by them is part of the training, and trick Finn and Jake into throwing themselves off a cliff because they think they can fly.
  • The season 2 finale as a whole. The Lich, who looks as terrifying as expected? Check. Princess Bubblegum hospitalized in serious condition? Check. Her SKIN MELTING OFF HER BODY AS FLAMES DANCE ABOUT HER? Check.
  • Unlike most villains on the show, The Lich is a monster that even Finn and Jake had trouble dealing with.
  • If you look closely you can see very tiny and faintly seen pupils in the Lich's eye sockets, for some reason it's just disturbing.
    • Here's the link. The low voice for Bubblegum actually makes it worse.
    • To top off the two-parter, a Lich-possessed Bubblegum turns into a gigantic Eldritch Abomination and wreaks havoc on the kingdom. Finn asks Ice King to freeze her to buy Finn time to save her, and IK does so. The citizens gather around and rejoice... until the frozen monster tips over and shatters, sending the body into pieces. The entirety of part 2 deserves a place of honor here.
    • During the first showdown with The Lich, Finn shoves his sweater into the Lich's eyes, pulling his skull out and shattering it to pieces. How does the Lich react during all this? He laughs.
    • The Lich is basically the personification of this trope. The dude has no brilliant evil plan or secret weapon: he's just there to KILL EVERYONE. He cannot ever be truly killed since he can swap bodies whenever he feels like it. And just look at his face!!!
    • And at the very end of part two, it's shown that the snail is still possessed by the Lich's evil influence... Probably for the sake of cliffhanger, but still...
      • What makes this even worse is that any further appearance of the snail shows that the Lich is silently watching Finn and Jake's every move...
    • Hell, the Lich was redrawn as the creators didn't think he was scary enough.
      • Which, essentially, makes it look like The Horned King, an already terrifying character design in its own right, with such lovely additional features like a partially-rotted face with flying skin flaps, empty eye sockets, and large, curved fangs in a constant Slasher Smile
    • But, wait, there's more! He's gifted with extremely talented Mind Rape abilities that let him force unwitting victims, who are not even aware of the fact they are being mentally possessed, to do his bidding, just by looking at them! And he's still able to pull this off in a cryogenic state!

    Season 3 
  • The revelation that those gladiator ghosts in "Morituri Te Salutamus" were originally best friends, just like Finn and Jake, who were driven insane and forced to kill each other.
    • Before that, how the gladiator ghosts would be in visible despair as they fought, either for killing their freind ("Forgive me, Valius!") or for their friend betraying them ("Et tu, Walius?").
    • Also when Finn became insane and tried to KILL JAKE. Granted, he was faking it BUT WE DON'T KNOW THAT!
    • At the end of this episode when the gladiator ghosts are floating up to the heavens with the creepy sounds in the background.
      • According to Andy Ristaino, the gladiator ghosts were LOVERS. Presumably, they lived together, slept together, and loved each other dearly... and they killed each other. The revelation that they were romantic partners in ADDITION to being friends just adds on even more horror, and it's an even bigger tear jerker.
      • The Fight King himself looks like a burned corpse and makes awful cracking noises when he moves.
  • The background music in "Memory of a Memory." It's so eerie...
  • Scorcher from "Hitman." Unlike most villains in the show, he's quiet, calculated, ruthless, and has no amusing quirks.
    • The title card, which appears to be Finn and Jake being targeted by a sniper.
  • "Too Young" - Princess Bubblegum's flashback of creating Lemongrab. The scene zooms in on PB's dark, creepy laboratory as sinister strings play over the soundtrack. PB looms over a bed/table, where Lemongrab (minus face) is lying. She sticks a nose onto his face, and pours a chemical from a vial onto his face as well. The chemical seeps into his skin, and features form. Lemongrab's eyes snap open, and he lets out a hideous groan. Then, he bolts up and starts flapping his arms, screaming in terror as Princess Bubblegum looks at him with helpless, surprised fright. Then Lemongrab screams louder, as his eyes roll back into his head. Princess Bubblegum's reaction is the same as ours- she gasps in horror and mortification. The scene is terrifying from PB's, and Lemongrab's perspective.
    • There was a very creepy scene storyboarded for "Too Young" that didn't make it into the episode, most likely to save time. Normally, Lemongrab is just an obnoxious, unhinged jerk, but in THIS scene, he's downright terrifying, and doesn't show qualms about terrorizing small children and making them cry. In the scene, Lemongrab says, "Anyone who disagrees or disobeys will be thrown into the dungeon." A little candy CHILD gasps, and asks, "The Royal dungeon?" Lemongrab turns to the kid angrily, and shouts, "Thirty-TWO days in the dungeon for you!" The kid stutters a bit, trying to defend himself... until Lemongrab makes a horribly creepy, deranged Nightmare Face and shouts "DUNGEON!" The kid leaves the room in tears.
    • Lemongrab's laugh. Basically, a totally joyless, insane laugh as his head flails around with weird squishy noises. Even everyone else is creeped out.
    • This is more of Fridge Horror or blink-and-you'll-miss-it, but it's incredibly unsettling. Everybody in the Candy Kingdom was imprisoned, and set to stay in the dungeon for several years. Lemongrab doesn't seem to understand anything about people's most basic feelings or needs. There's a great possibility that if he had stayed ruler of the kingdom, everybody would have spent five whole years in the dungeon. This is even worse for the candy people who were stuck in the very tiny cages suspended from the ceiling. Imagine being stuck in there for an extended period of time. With the knowledge that Lemongrab is basically Too Dumb to Live, those prisoners might have gone insane, or starved.
    • Lemongrab himself creeped out a significant portion of Adventure Time fans- thanks to his psychologically unstable personality, banshee-like screams, and his Uncanny Valley Dull Eyes of Unhappiness.
    • A combination of Fridge Horror and Tear Jerker. Imagine suddenly waking up in a dark, creepy room- having no idea who or where you are or what is going on, and trying to run away or call for help, only to be rendered immobile and unable to communicate in any way but screaming hideously. Then imagine learning a little about your situation- learning that you're a failed experiment that your own creator doesn't even want or like. THEN imagine what it must be like to be totally unable to read social cues, talk normally, or express yourself in a way that doesn't cause people to be put off by you, leading to an extremely isolated, friendless life. THIS is Lemongrab's whole life. Holy shit.
    • SUPER Fridge Horror. The fact that Lemongrab is still the rightful heir to the throne. If something happens to Princess Bubblegum, he'll be back...
    • More fridge horror. "He was the first of my experiments gone wrong." Cue Goliad many episodes later...
    • The name of Too Young's Sequel Episode: You Made Me! *shudder* That does NOT sound good...
      • It isn't good. Lemongrab watches the candy people while they sleep. *shudder* Creepy!
    • http://www.formspring.me/PadraigS/q/349683657746696110 This horrifying drawing of Lemongrab by production assistant Patrick Seery.
  • Fionna and Cake. It was a pretty light-hearted episode, but one scene is downright terrifying for adults, especially women, to watch. Prince Gumball says, "Fionna, I have to show you something." He takes Fionna's hand and leads her up to his bedroom. "Hey, is this your bedroom?" Fionna asks. We see Gumball's bed, covered in rose petals, illuminated by an off-screen spotlight. We see Gumball step towards Fionna with a serious expression on his face, as he unbuttons his shirt. "Woah... heh heh..." Fionna says nervously. Up until The Reveal, where the audience sees the REAL Prince Gumball frozen to the ceiling, it looks like Gumball's about to RAPE Fionna!
    • Horrifying from Cake's perspective. We see Cake standing in the hallway, listening to what's happening upstairs. We hear a loud thumping, and Fionna crying, "Get off of me!" Cake's terrified reaction sells it. And when she comes back to the room, she sees Fionna's dress completely tattered. She launches herself at Gumball and attacks him, screaming "Don't you touch her!"
    • What about when Fionna realizes what's going on and the Ice Queen reveals herself? Fake!Gumball starts laughing and continues removing his clothes. It gets really creepy when Fake!Gumball's voice gets higher and higher in pitch until it shifts into Ice Queen's genuinely unnerving cackle, all the while the Ice Queen appears to be crawling out of Gumball's chest!
    • And what's possibly the worst part, in a sort of meta way? The whole episode is fanfiction... written by the Ice King. Now consider the final lines of the genderswapped main characters. Might double as Nausea Fuel.
  • "The Creeps," as the first Halloween episode, had its moments. The worst part was probably Cinnamon Bun's splattered remains inside a closet!
    • Or the green, slimy ghost that came out of nowhere! Made all the scarier with the Real After All revelation and the sudden flashback that occurs right before Finn makes himself forget about it.
    • Even though it was just a wax replica, PB melting was creepy.
  • Lub glubs. The name not sound scary at first, but when you find out what they really are.... They look like nothing more than harmless inflatable pool toys, but then we find out that they are actually formless Eldritch Abominations that are covered in teeth. Also its strongly implied that they killed off the last remaining humans.
  • The episode "No One Can Hear You" is full of this.
    • When the deer is revealed to be the mastermind, he stands up and takes off his hooves to reveal human-like hands.
    • Finn waking up in the hospital and finding the Candy Kingdom absolutely empty. This is a show with Loads and Loads of Characters, so having Finn and Jake be the only ones there for most of the episode is downright terrifying.
    • Also the fact that the citizens of the Candy Kingdom were trapped constantly licked by the Deer (which one would assume to be seriously painful to a candy person). The only two people that could help them were Finn, who was in a coma with both of his legs broken, and Jake, driven insane due to a head injury and believing that everyone else was just hiding. Now imagine the poor citizens of the Candy Kingdom constantly moaning in anguish for help that would never come. FOR SIX MONTHS. Suddenly the title for the episode becomes all the more fitting.
    • The implications that the cinder block probably broke the Deer's neck and it was tossed into the water to die (Yet it was quite satisfying at the same time).
    • How about Finn having to deal with the injured Jake? It's bad enough dealing with an mentally unstable physically superior person, but one that is also your brother? That episode is very scary.
  • "New Frontier". The episode involved Jake having a dream revealing the details of his own death, called a "croak dream," and then trying to make sure the death happens once details from the dream start to appear in real life. He claims he's doing so because You Can't Fight Fate, but as the episode goes on, he starts to come across as downright suicidal. Finn gets a bit suicidal as well. When they're in the lake, Finn refuses to leave Jake's side even though he's drowning, saying he'll stay by his side "forever". That leads to some scary implications. If Jake died, would Finn... choose to follow?
    • When Jake's dream was nearly over, out of nowhere the Cosmic Owl appears and lets out a high-pitched shriek, accompanied by a sudden noise.
  • A great overlap between this and Tear Jerker is found in "Holly Jolly Secrets," when we learn that the Ice King used to be a man named Simon Petrikov, who was engaged and becoming an antiquarian. He was sold what would become his Iconic crown, and put it on his head just as a joke for his fiancé Betty. This small contact with the magical artifact led to a slow descent into madness, quickly making way for a Noodle Incident that caused Betty to leave him. The crown then continued turning him into a monster... turning him into what he is now.
    Simon: I don't know when it'll end... (almost whispering) I'm really scared...
    • The subtle take on a Scare Chord that was used when we first see Simon open the cabinet and show his audience the crown.
    • Simon's voice gradually, and subtly changing, into the Ice King's. The physical transformation was clear, but the vocal change really helped to emphasize how his body AND mind were changing.
    • The implication that either the crown either protected the Ice King from one of the events that started the Mushroom War, or made him do so through his power over ice and frost.
    • The worst part is that Ice King's in denial about once being human. It appears Ice King is too far gone to ever be human again.
    • "Please love me again, Betty!"
    • His entire monologue was one minute and a half of pure, concentrated, psychological horror.
    • Hello. My name is Simon Petrikov. I'm recording this tape so that people will know my story. I was studying to be an antiquarian of ancient artifacts. Now, I've never believed in supernatural stuff myself, just had a fascination with superstitions. But everything changed when I came into contact with this item. After purchasing this crown from an old dock worker in Northern Scandinavia, I brought it home and excitedly showed my fiance, Betty. I jokingly put it on my head just for a laugh or something. And that's when it started... the visions. I fought with them, shouted at them until I realized it wasn't real! It was the crown! I quickly took it off, and saw my fiancee in front of me, looking at me with such contempt! What had I said? What had I done when I wore this crown? All I know is, I never saw Betty again. Since then, I now see the visions always whether or not I wear the crown. They tell me the secrets... the secrets of the ice and snow... that the power of the crown will save me with its frost. I don't know yet what this means. As you can see my skin is beginning to turn blue. My body temperature is lowering in a supernatural rate, to what is now about 30 degrees Celsius. I don't know when it will end. I'm really scared. I know my mind is changing... but I'm already too far gone to know what to do. I want people to know that... if I do things that... if I do things that hurt anyone, please, please forgive me! Just... watch over me until I can find my way out of this labyrinth in my brain and regain my sanity! And then maybe Betty, my princess... maybe you will love me again... Please love me again, Betty!
    • This is made even more terrifying with the implication that the Ice King is so obsessed with princesses because he's trying to get back his 'princess' Betty.
    • The music during the final tape. Watch that scene, and just pay attention to the music. It's positively chilling.
  • All those dead animals lying around in Wildberry Princess's castle with their lifeless open eyes...
  • The freakin' clown nurses from "Another Way", especially the Nightmare Sequence Finn has early in the cartoon.
    • It's that damn Scare Chord that accompanies the Monster Clown image that's scary.
    • Finn's unabashed conquest to have it his way. He mortally injures multiple forest creatures in the process, completely going against his code to help anyone. Eventually he sees the errors of his ways and heals them all..
  • In "Ghost Princess", Clarence's death. The soft-e-cheez exploded out of Clarence's body with enough force to completely shatter his sternum. Jake had a very good reason to swear off cheese spread...
  • "Dad's Dungeon" had 2 particular scenes. The first being the fruit witches when they went bad and second being the monster at the end.
    • Especially the Fruit Witches sequence. Finn in Jake are in a surreal room full of fruit while beautiful women are floating around telling them to take a bite. Jake is Genre Savvy enough to know it's a trap so he stuffs an apple into one of the women's mouths. Vines protrude out of her mouth and eyes and cover her whole body. The vines then fall apart, leaving behind a huge apple. The other women turn into demons and ferociously tear apart the apple, and feed the shreds to what looks like miniature lub glubs in their hair, revealing what appears to be BONES. ON A BLOODY APPLE CORE.
    • After the demonic girls are done feeding they leave behind an apple core with a dark suspiciously meaty looking center with bones coming out of it and some visible blood. The girls then chase after Finn and Jake, after seeing what happened to the apple, just imagine what would have happened to our heroes. This one really takes Family-Unfriendly Death to an extreme.
    • And regarding the monster... The first we see of it are its GIANT hands, which grab Finn and Jake's dad between two fingers. It stays mostly in shadow, but we do see those GIANT hands, tentacles, and a diamond eye, and it just laughing...
  • Jake, using stretchy powers, acting out a disturbing scene of Finn strangling him in "Incendium." What a twisted mind he has!
    • Do. NOT. Piss. Off. Flame. Princess. When Jake says "Never mind" to Flame Princess and (acting as Finn) suddenly and rudely rejects her, she says "You... WHAAAT?!" while abruptly changing into her fiery form.
    • Finn raging after Flame Princess burns his pictures of PB, and screaming at her. "WHO LIT THAT FIRE?! I'LL KILL YOU!" It was rather frightening to see Finn like that- ready to actually kill Flame Princess... until her true form was revealed.

    Season 4 
  • "Five Short Graybles". PB and Pepbut actually killed a cute little jellyfish for the sake of making the greatest sandwich ever by cooking it. If you think about it, it died in a pretty awful way.
  • The ending of "Web Weirdos", where Finn and Jake are buried under a mountain of baby spiders infinitely gushing out of their mother's backside. During the fade to black.
    Jake: Love like theirs will always find a way. It'll crawl all up over you and drain your body fluids, poisoning you slowly until you pass out.
    Finn: WAAAAAHHHHH!!!
    Jake: Circle of life, Finn. Circle of life...
  • Jake in "Return to the Nightosphere". He turned into some kind of gross demon for real: http://youtu.be/vwlO3o3vmRo.
    • Nightosphere monsters. One of them looks like it had one side cut off.
    • As they pan across the horizon to show us what the Nightosphere really looks like, the only sound effect that can be heard leaves him shaking in fear. It's a sound effect that sounds like an old woman dying a horrible, slow, painful death.
    • And Marceline's Chaotic Evil form complete with creepy, modified voice.
      NO ONE LEAVES THE NIGHTOSPHERE.
    • The cruel and bizarre punishments. One demon was forced to eternally vomit bananas (and bananas are considered to literally be shit in the Nightosphere,) and one had his entire head turned into abdominal muscles. According to Andy Ristaino, they didn't get better, and their situation is probably far worse right now.
    • A touch of Fridge Horror. One of the Nightosphere demons in the background looked almost exactly like Lemongrab. That's just too weird to be a coincidence.
    • The fact that all of the mentally handicapped demons are all locked up in jail, left to either go insane or become even MORE insane.
      • Or even worse, they could've been horribly traumatized by the horrors of the Night-O-Sphere, which we never get to see.
  • At the end of "In Your Footsteps", the Lich has returned and appears to be plotting something along the lines of vengeance.
    • That scene at night where the bear is standing in front of the mirror, wearing Finn's clothes, imitating him. This creeps Jake out, so he silently walks away, looking just as disturbed and confused as us. It's one of those scenes where it's hard to explain why it's unsettling, but it is.
    • When Finn and Jake are having a nasty argument (lots of shouting), BMO, who just got home from soccer, sits on the floor quietly, absentmindedly rolling his soccer ball back and forth. This brings to mind the way a child reacts to his dysfunctional parent's arguing. The scene is pretty weird and mundane to the average person, but it probably caused countless fans, who grew up in dysfunctional households, to cringe or just feel disturbed.
  • After the climactic hug battle at the end of "Hug Wolf", Finn turns back into a normal boy, and the original hug wolf turns into a surprisingly beautiful woman. After Finn and the woman remark that they both feel like they don't need any more hugs, Jake goes up to the woman ask if he can get a hug, and she flashes a pained look at the ground before spontaneously turning into another Tree of Blight, there's there's a short cut to Jake screaming, and then the episode ends. This isn't as random as it might seem. During the opening scene, the Alpha Hugwolf was hit with a piece of the exploding Tree of Blight. Evidently, this causing the victim to transform into another Tree of Blight, who will, presumably, be dealt with in the same way as the first one. Poor girl.
  • The whole premise behind "Princess Monster Wife," which is essentially about Ice King stealing the princesses's body parts. We see LSP cut open, PB with a chunk of her head missing, and (disturbingly) Turtle Princess with about three fourths of her head gone.
    • The way PB tries to talk with most of her head missing. Incomprehensible gurgling. Sweet dreams...
    • And of course the titular "Princess Monster Wife" in question... 'she' is about as disturbing as you can imagine...
    • The way the Princess sounds- three voices at once. Also a HUUUGE Tear Jerker- as when she cries, we hear three voices crying.
    • The combined Princess is alive... and essentially takes herself apart, which could be seen as killing herself for the good of the other Princesses.
  • PB's frazzled, exhausted, slightly unhinged appearance in "Goliad." We haven't seen her looking so "off" since "The Duke."
    • The fact that PB has made a clone of herself that can live forever. Has she really lost it this time?! We all remember what happened the LAST time she tried making an heir to the throne. Knowing Adventure Time, this will not end well...
      • It DIDN'T end well. Goliad was even WORSE than Lemongrab. LG was an asshole, but PB's newest creation is completely evil and sociopathic.
    • Goliad herself, a sociopathic, telepathic sphinx mutant whose entire premise is based off the alien children from Village of the Damned (really easily obvious when Finn tries to keep his thoughts away from Goliad). Especially the part with the bee...
      • She crushed the bee in her paws (we saw blood, too!), and brought it back to life with her psychic powers. This made even PB frightened!
      • Her disturbingly logical speech upon her turn to the Dark Side, delivered in that perfect Creepy Child voice:
      "No, Princess. Bee cares not for flower. If getting pollen hurts or kills flower, bee would not care. ::crushes bee:: Bee is stronger than flower. ::reanimates bee:: Goliad is stronger than bee. Goliad is stronger than all..."
      • It's worth mentioning that the hypnotic eye stalk looks and functions identically to Edward's mutated pineal gland in the horror film "From Beyond." [1]
      • Incidentally, Goliad was voiced by an actual little girl. And as long as we're here, how about a more realistic version of the battle?
    • The children entering Jake through his eye sockets in an attempt to damage his brain. And when Goliad mind-controls the kids to do the same thing later.
    • Jake freaking out and yelling at the candy kids.
    • The implication that, for all intents and purposes, Finn's son and PB's daughter are doomed to spend the rest of eternity in a meta-world, fighting each other, with no hope of ever coming back.
      • Although, if Stormo inherited some of Finn's Blood Knight nature, he might be enjoying it... which may not be very comforting, really.
    • The implication that (because of Goliad's current state) if PB really DOES die, Lemongrab will inherit the throne to the Candy Kingdom. Oh dear Glob, save us...
      • But it might not be that bad - Lemongrab has settled down with his clone, so maybe they'll rule the Candy Kingdom together?
      • Unfortunately, "Too Old" reveals that Lemongrab has become a sadistic tyrant who oppresses the lemon people and cannibalizes Lemongrab 2. The idea of a disturbed Lemongrab on the Candy throne is frightening enough, but a disturbed, unfettered, sociopathic Lemongrab is even worse!
    • When Finn asks PB why Stormo didn't tun evil, she says it's because he is based on Finn's "heroic DNA". Considering Goliad, who was based on PB, became an evil sociopath bent on ruling the world with mind control, what does that say about her DNA...?
      • It might not be PB's fault. During the scene that depicts what PB put in the formula, one can see Cinnamon Bun getting thrown in the mixture with candy biomass, and climbing out before she puts Algebra in. Cinnamon Bun may have a repressed evil side covered up by his klutzy and thoughtless nature.
      • Also keep in mind that she hangs out with Peppermint Butler almost 24/7. Wouldn't be surprising if tiny shavings (Candy Person Dandrift) from him got in somehow. Or he sabotaged her from the beginning. Who knows?
    • The fact that all this could have been avoided if PB hadn't played God is also pretty terrifying. Making Goliad is one thing but creating another with Finn's DNA... What would happen if Stormo didn't want to fight her?
      • They'd have been exactly as screwed as they already were, so hey whatta ya got to lose at that point? Fire with fire, or mad science as the case may be.
  • "Beyond this Earthly Realm" had plenty to offer in the nightmare department.
    • Finn gets trapped in the Spirit World after touching a magic artifact, leaving him out-of-phase with the real world— he can see and hear Jake, not vice versa. It's a situation eerily similar to Transformers Prime's Shadowzone, except that Finn lacks the convenience of being able to text Jake for help.
    • The Spirit World is inhabited by a vast collection of bizarre, Lovecraftian creatures that drift about with no rhyme or reason, seemingly just there to creep us out.
    • The only one who can help Finn is Ice King, who's able to see him with his Wizard Eyes. That's not the scary part, though— this reveals that all the crazy things he sees with said eyes actually are real. The whole time, he's been able to perceive the denizens of a world out of phase with our own, akin to the protagonist of From Beyond. He mentions to Finn that they scare him a bit, but that he's relieved that they can't actually interact with him. Once he gets pushed into the Spirit World as well, he's absolutely terrified once the monsters are able to touch him for real. There's also a disturbing rape subtext when he Madness Mantras cries that he's sorry and that he needs Finn's hat as a buffer because they were touching his body.
    • The... head-spitting, Shub-Niggorath-like thingy that stalks the Spirit World version of Ice King's castle. Even he finds it off-putting, which is saying something.
      • Fridge Horror sets in when you think about the name Ice King gave it: the Dead One. The heads and the creature itself make a very distinctive 'wak wak' sound. A sound very similar to the 'wak waks' Ice King's penguins make. Maybe one of the penguins wasn't so fond of the King when it died...
      • Holy—! does that mean the penguins emulate the dead one's "wak wak" like the huge albino penguins from The mountains of madness mimicked the old ones/shoggoth's "Tekeli-li Tekeli-li"?
  • Lumpy Space Princess wearing lipstick. *shudder*
    • The shadow Finns in the mirrors. While they're easier to dispatch, they still got in a LOT of claw-swipes at Finn, and if he hadn't been there to break into the chamber filled with them, LSP would be a complete and utter goner.
    • There's a quick scene towards the end of "Gotcha" in which Finn is sitting on a log next to the snail, who, last we've heard was possessed by the Lich. The idea that Finn could be within striking distance of the Lich and not even know it is quite frightening.
    • Between the mirror!Finn undressing and LSP saying that she took it too far/blaming her lumps for turning Finn into a "grody monster", that scene in the mirror room may be very... uncomfortable to some viewers.
  • The previews of "Princess Cookie" are just chilling. A rogue cookie is taking hostages in a convenience store... with a baseball bat as a weapon. We see Princess Bubblegum trying to offer things to the criminal, who screams at her that he wants her crown. Later on, we hear him saying "I'M ABOUT TO FLIP OUT!" Geez...
    • THE COOKIE TRIED TO COMMIT SUICIDE. HOLY HELL!
    • According to Jesse Moynihan, the Tart Toter is "beyond rehabilitation." The way he is now, he'll always be like that.
  • Several faces during "Card Wars". Here's one with Finn. And another. Can't forget this one. This one has Jake. Finally, we have.
  • The entire episode "Son Of Mars" is pretty chock full of it. Magic Man starts the ball rolling by transforming a deer into a telescope, and then neglecting to transform it back afterwards
    Magic Man: You're welcome!
    • It's lessened when there is the distinct possibility it's that freaky stag.
    • All of the torture that Magic Man inflicted upon the martians- Body Horror, conjoining all of their arms together, bringing their shadows to life to attack them, mutilating them, and replacing all of their drinking water with... hair...
    • Magic Man's house, which, according to Finn, "is a reflection of his sick mind." It's an old, decaying (literally!) house, broken, filled with mold, and there's a dead rat in the corner. Magic Man seems unaware of how disgusting it is.
    • Magic Man himself. Although he's a very funny character, he's EXTREMELY disturbing. First of all, he tried to have Jake killed just so he could get his powers back- and obviously felt no remorse. There's also his disgusting lack of empathy for others... and the creepy, sing-songey way he avoids Finn's direct questions, such as Finn's inquiries about his home or his girlfriend.
    • On the subject of Magic Man's girlfriend, the King of Mars hints that something happened on Olympus Mons between them which turned Magic jerky. Some promo art for the Sons of Mars title shot reveals his jerkiness may stem from survivor guilt as Margles' appears to have fallen to her death in the dead volcano's crater.
    • THE GUNSHOT. Supposedly, the only way to save Jake was to have Abraham Lincoln travel back in time to Ford's Theatre and be shot again by John Wilkes Booth.
    • Grob Gob Glob Grod's design, which is eerily reminiscent of the Flatwoods Monster.
    • The skull with worms crawling around in it.
    • The 37th Dead World. Note that the tall, skeletal creatures remain eerily still, as if there is no time there.
  • In "Burning Low," Finn almost died of oxygen deprivation.
    • Flame Princess exploding.
    • Flame Princess falling down into the ground.
    • Everything Princess Bubblegum reveals about Flame Princess. She knows how Flame Princess works, and knows that Flame Princess is physically incapable of romance. Basically, Flame Princess is so unstable that if she gets romantic with Finn, she'd cause a reaction that would have her burn into the ground and eventually burn up all of Ooo. The viewers knew how volatile and dangerous Flame Princess can be, but Princess Bubblegum states what exactly could happen.
    • Finn's burned face.
  • The dream sequence from "BMO Noire". There's one part in which BMO has a creepy, Uncanny Valley male "detective" face, complete with Lemongrabb-ish eyes and a nose. It looked so wrong.
    • Especially because we saw it in shadow, for a split second, making it seem like a subliminal message of some kind. The message? Sleep well, kids!
    • When Finn and Jake come home from adventuring, Finn is carrying a blob man thing in his arms. When BMO reveals that he found the sock, Finn drops the blob man thing and it doesn't even twitch. FINN WAS CARRYING A CORPSE!
  • "King Worm". The entire episode is one horrifying Mind Screw!
    • The title card. It's a mess of giant eyes, Finn/King Worm hybrid vomiting out melting Jake heads, Lady Rainicorn with multiple mouths on her body, PHIL FACE (the face on Mrs. Cow's udder, the face used to open the Nightosphere), all around Body Horror... oh, and The Lich is in the background.
      • The title card music is absolutely terrifying. It can be heard in the episode proper when the Gunther abominations are on the march, but the music's mostly drowned out by the noise.
    • Finn with Lemongrab eyes and a pointy nose.
    • Finn's voice distortion before he describes the sword he want to appear, the whole scene with Jake's Dad, the LSP rain splattering on the ground, Lady Rainicorn's voice, Jake FREAKING MELTING, the King Worm's scary laughter, the Lich coming out of Finn's belly button, the dying Worm King, much EVERYTHING in "King Worm".
    • In Finn's dream, PB is having coffee with the Lich. Finn asks what's up, and PB makes a horrifying Nightmare Face and says "You wouldn't understand, because you're TOOOOO YOOOUUUUUUNG!!!" in a demonic voice.
    • An Eldritch Abomination made of penguins chases after the Ice King.
    • The ghost girl from the second whodunit episode makes another appearance.
    • Peppermint Butler appearing and telling Finn how to get out of the dream. Not that the warning in of itself is scary, but because you somehow get the feeling that it was the real PepBut invading Finn's dream, because it seems the sort of thing Peppermint Butler could do.
    • After later episodes from the season, specifically "Reign Of Gunthers" and "The Lich", many of these examples become even worse, and watching the episode again highlights some downright disturbing Foreshadowing.
  • The Title Card for "Lady and Peebles." It's so creepy. At a first glance, it's a bunch of photographs of PB and LR scattered on the table. Look closer. Finn and Jake are actually in a lot of the photos. But they're all scribbled out in black pen, as if someone wants to get rid of them...
    • It gets even creepier when you notice that the pictures are laid down on what appears to be intestines, and a couple of worms are slithering over the pictures too!
    • Somehow Ricardio manages to be even CREEPIER in this episode. His face is somehow stranger and it doesn't help that he now has giant muscled arms and legs attached by creepy red sinews and tendons.
    • In one shot, it looked like Ricardio was going to rape PB!
    • The Ice King, minus his heart, lying on the ground, veins and arteries snaking out of him.
    • Here's some Fridge Horror. Ricardio demonstrates his new muscles by twisting Lady into a knot. This becomes worse when she reveals she's pregnant.
      • Any of what happened to her that episode was hard to even comprehend knowing she's pregnant. She was shot at, crushed... And all the while, she knew she was pregnant!
    • Lady Ranicorn's speech at the end of the igloo portion. For those who don't speak Korean, she basically talks about a dream where zombies attack her house and kill her family. And she apparently has this dream all the time.
      Lady Rainicorn: I'm little bit too worrying sometimes. I always got haunted by the nightmare that half-dead corpses attacking my house! My uncle, aunt-in-law, cousins were all present, I even hear the crying coming from the upstairs. I just wished that I could protect my family... I become too stressful during that dream, I even grind my own teeth! (Grinds teeth) When I wake up in the morning, all my teeth are cracked up! I usually try to forget about it, thinking that it's just a dream or I'm being paranoid, but I was actually attacked by these half-dead corpses before, twice!
    • What Lady Rainicorn and Princess Bubblegum were attacked by in the episode. Long, grabbing hands, giant eyes that shoot lasers, and a huge tongue. The cave they were in was a Womb Level made from Ice King's biomass.
  • "You Made Me!".
    • Lemongrab watches the Candy People in their sleep. Just standing there, staring, in the pitch darkness, only the glow from his eyes are visible.
    • Lemongrab was creepy enough to begin with- creepy eyes, constant screaming and freak-outs, no sympathy for anyone... And now we're adding "stalker" to the list?!
    • How 'bout all those hideous faces he kept making?! DEFINITELY the expressions of a sane, well-adjusted man!
    • In an animatic released before the episode aired, Lemongrab goes batshit, tries to leap out of a window, and then screams at PB (in a shrieking sort of way we quite haven't heard before), demanding that she give him candy people to rule over.
      • The music that plays in this scene of Lemongrab's freakout is some of the creepiest and most chilling music that has ever appeared in the show. It really helps drive the point that Lemongrab is NOT all together and he's got serious psychological issues.
    • When Princess Bubblegum confronts Lemongrab over his spying on the people of the Candy Kingdom while they sleep, Lemongrab says that he is within his rights. He has the right to break into your room and watch you sleep? Hello, Paranoia Fuel.
    • Princess Bubblegum agreeing that Lemongrab was within his rights to sneak into candy people's rooms and watch them sleep. Candy Kingdom law is messed up.
    • http://www.formspring.me/skronked/q/357282360720377604 This recent, incredibly creepy drawing of Lemongrab by the lead character designer Andy Ristaino.
    • The title card for the episode, which depicts an allusion to "Frankenstein." Princess Bubblegum is looming over a lab table (on which is lying the earl), holding Lemongrab's nose. She's grinning from ear to ear as lightning strikes behind her through the window, and in the devices in her lab. It's mostly scary because of what we know happens to poor Lemongrab afterwards.
    • A security camera revealed that Lemongrab was in the dark, spying on someone. All that can be seen is his eyes in the darkness... When the camera zooms in, it shows Lemongrab's silhouette, and those same dead, unblinking eyes. Finn's reaction is the same as ours- he screams.
      • It's uncanny how much Lemongrab resembles an Enderman in this scene.
    • "I am alone... and you made me like this! YOU MADE ME! YOU MADE ME! YOU'RE MY GLOB! YOU'RE MY GLOB!", a deranged Lemongrab psychotically yells after jumping out of a window and ripping his clothes off, clearly having a breakdown.
    • Lemongrab continues to go BATSHIT INSANE. The Pup Gang go over to Lemongrab's castle upon Princess Bubblegum's request. He yells at one of them for having headphones on, and starts saying his catchphrase "UNACCEPTABLE!!" and starts descending into utter terror and madness, by going over to a mirror, pointing at HIMSELF in outrage, dramatically turning his head around, and then locks the thugs in a prison and electrocutes them.
      • Lemongrab turning his head around. He doesn't have a neck, and yet he manages to twist his head around almost 360 degrees to make the most hideous, frightening face at the Pup Gang. It isn't cartooney, either. His "neck," or whatever connects his head to his body, contorts and strains noticeably.
      • And he electrocutes them again when Finn and Jake go to rescue them. He amplifies the electricity! Lemongrab at this point is a complete psychopath, and then when Princess Bubblegum tries to confront him, he turns on her.
      • The sheer glee he displays as he tortures them. He SMILES! And as he electrocutes the Pup Gang, he groans, and looks up with this twisted look of almost orgasmic pleasure on his face.
      • As he tortures people in the Conditioning Room, it's difficult to tell if he's insane and unaware that he's hurting people, or if he's a sadist who's all too aware of the pain he's causing. He speaks softly (for once!) and smiles. It ranges from a tiny Kubrick Stare smile to a kiddish little grin to a WIDE JOYFUL SMILE WITH BRIGHT WIDE EYES.
    • Lemongrab's attempt at trying to talk to a citizen of the Candy Kingdom, a baby cookie. He started poking the kid... then started SLAPPING him, then SCREAMED: "PUT YOU IN MY OVEN! IT'S GROOOSS!!!"
      • He doesn't just slap the kid. He punches the kid in the head repeatedly, while making the most hideous and disgusting faces imaginable, while screaming and babbling incoherently. Then, after he yells the aforementioned line, he actually pushes the kid onto the ground, and doesn't even seem to care as the kid cries. It's hard to tell whether he's insane, or actually a sociopath.
    • Princess Bubblegum creates Lemongrab a clone, and they start poking each other. The scene is just... surreal. There's even a Scare Chord in the music. At one point, Lemongrab 1 actually pokes Lemongrab 2 in the eye, and LG 2 doesn't even care at all. Ew! Admittedly, it does end up being pretty heartwarming, but you don't know quite what to think when it starts.
    • The scene where Finn and Jake find the Pup Gang in the Conditioning Room. Lemongrab comes in, sees Finn and Jake in the Conditioning Room... and abruptly shuts the door, trapping them inside.
    • Many of the faces Lemongrab makes throughout the episode. They're just... not natural.
    • When Lemongrab backed Princess Bubblegum up in a corner and brandished his sword at her. If Lemongrab clone hadn't shown up, he would have knocked her unconscious with the sound sword and then electrocuted her in the Reconditioning Chamber!
    • Lemongrab's confrontation with Princess Bubblegum. The princess is speaking gently to him and trying to calm him down, but he hunches over and slinks over to her, glowering at her, screaming, and then suddenly, his eyes grow as wide as saucers and become the most manic we've ever seen them. He backs her up into a corner. It's hard to tell who's more terrified of the other.
      Lemongrab: NO! NORE MORE HELPING! YOU UNLOAD YOUR PUNKEST BOYS ON ME?! TRY TO CHANGE MY WAYS?! YOU'RE POOOOOOISOOOOOONNN!! YOU'RE POOOOOISOOOOOONNN!!"
    • There was something really unsettling about Castle Lemongrab itself. It's empty, VERY minimalistically decorated, and filled with nearly empty rooms that contain only catcher's mitts. There's just something very off about the whole thing.
    • Lemongrab's nasty, big, pointy teeth.
    • Lemongrab when he's calm. There's something... not right about a screaming lunatic suddenly calming down and smiling a cute little smile as he tortures small children.
  • "Who Would Win?" The Farm's all-black, slanted eyes and broken, lolling neck.
  • "The Hard Easy" had a pretty terrifying frog monster with its gaping mouth along with the disturbing transformation back to Prince Huge.
    • When the Mudscamp Elder describes how frightening getting eaten by the Mega-Frog would be:
      Elder: I mean, what if you got ate? Think about it: all alone in a stomach full of acid? "Mommy! Mommy, mommy help me!".
    • Megafrog rolling his eyes back into his head as he forces his body into the cave.
  • The trailer for "The Lich" that aired directly after "I Remember You". Seeing The Lich's face zoom in at you directly after Simon Petrikov-era Ice King gives a young Marceline a toy during the Mushroom War is unsettling.
    • It's even worse is if you first thought it was part of the episode, implying that The Lich caused the Mushroom War. Now that the show is focusing on the other characters backstories and relationships, this would explain why everyone was so terrified of him. It's hard to watch the scene with the Lich's face included without tearing up.
      • The fact that the show's biggest monster is back is terrifying enough, too.
    • The title card. Good Glob!
    • The episode begins in a creepy manner, with Finn having a weird dream, where the Bear from the episode "In Your Footsteps" appears wearing a human mask, Billy briefly transforms into the Lich and the dream concludes with the bear eating Billy´s lady and the snail transforming into the Lich and attacking Billy.
    • Billy's half shredded face, revealing the Lich underneath it is deeply unsettling.
      • The grin the Lich gives when he thanks Finn for opening the portal. It's horrifying.
    • The implication that the Lich has killed Billy.
      • And that the dream Finn had was actually Billy's croak dream. Finn essentially saw the way Billy died and didn't even know it.
    • People with freeze frame televisions (or quick eyes) got to see the reveal coming in an eerie Marble Hornets kind of static millisecond during Finn's dream. An awkwardly gangly Lich reclining and just staring into the camera is somehow even creepier than the page image.
    • Princess Bubblegum "playing" with little creatures just as a child would with ants: cutting off their legs and sticking them in other parts of their bodies just to see how they would react. What the HELL, Bubblegum.
      • The truly disturbing thing? The little creatures are still smiling when Bubblegum cuts off their legs! Like they don't even mind that they're being horribly crippled!
  • The moment after Billy is hit by the gumball guardian, half of his face is gone, revealing that it's indeed the Lich. The fact that the half that's still Billy's face has a single, cloudy eye and skin-flaps? Yeah, creepy.

    Season 5 part one 
  • The mushroom war's mutagenic/nuke turned some poor sod into the Lich. In the Finn's wish universe, that poor sod was Jake the (regular) dog.
    • "He wished for the extinction of all life."
    • The scene where the Destiny Gang not only sets fire to the entire town, but AU!Finn's house. With his FAMILY STILL INSIDE. And they're LAUGHING while doing it. Brr...
    • In the universe Finn created with his wish, it was Finn, via possession by Simon's crown, who caused magic to return.
      • Fridge Horror: Remember, the Lich was originally called the Lich King. If other, smaller magical necromantic nukes fell during the great mushroom war, they could have created an army of lesser lichs that the Lich King would have ruled over. If so, they may still be out there.
    • Ice King!Finn in general. He seems more insane that Ice King is normally.
      • "The voices, they tell me to freeze the world. I am the end and the beginning. I am the hand of madness..."
    • Lich!Jake.
    • Simon's skeleton
    • Marceline's burned up, still talking skeleton. That she only speaks up to call Finn a "butt" doesn't really soften the blow.
      • AU!Finn kicking Marceline's skull off.
    • So wishing that the Lich never existed would have made Ooo a more peaceful and happy place, right? Actually, in an effort to avert the Lich's creation, it is implied that Prismo altered events so that Ice King!Simon stopped the first bomb that fell during the Mushroom War, which resulted in his death and the crown he wore going berserk and freezing all of Earth for 400 years. This of course averted the mushroom war which Marceline implies would have created the Lich we all know and fear, but in the end, humanity's society had backpedaled a little in technological advancement, they are still as selfish as during the war, Marceline was never bitten by a vampire and thus grew into a very old and crazy lady, AU!Finn took the crown for himself in an effort to save his family but became crazier than the Ice King and caused the bomb that Simon!Ice King had frozen to detonate, resulting in magical mutating nuclear fallout. And to top it off? Marceline died in the explosion and AU!Jake became the new Lich. Not exactly the happy ending Finn was hoping for.
  • Finn in the wish universe looks a like Lemongrab with the eyes and nose. It's kinda... unsettling.
  • When the bomb landed on Simon he weakly called for help, meaning he was only pinned down. You are now thinking about how long he must have lain there before being crushed to death or starved and how desperately Marceline must have tried to pull him out from under it safely, before being forced to leave trapped under what would become his tombstone.
    • Or she didn't find him in time to help.
    • Remember, she was only a little girl at the time.
  • When Prismo explains to Jake how important the wording of his wish is, he mentions that the wishes he grants affect both the past and the future. In other words, one wish could erase memories, cause people to be unborn, and cause entire worlds to either cease to exist or never be created in the first place. Jake becomes so overwhelmed by this, he throws up.
  • The last "Five Short Graybles" had Princess Bubblegum and Peppermint Butler crushing an innocent jellyfish to death on screen. This one has the incredibly disturbing imagery of BMO (and "Football") drinking tea, causing visible sparking and burning because of BMO's electronic nature, without knowing that it's killing itself.
  • From "Up a Tree" is the "tree cult". They seem at first like the usual Adventure Time goofiness, being a group of cute bickering tree-dwelling animals, but when they catch Finn spying on them the episode takes a sharp turn into the creepy as they chant with blank expressions and surround Finn, the lighting casting eerie shadows over their faces before a howling beaver knocks Finn unconscious.
    "In the tree, part of the tree..."
  • In "All The Little People", Finn romantically pairs up random mini-characters, and we see Marceline licking the red off of Peppermint Butler. Later, when we see how horrible these pairings have turned out, we see that Marceline has licked off half of Peppermint Butler's head.
    • Also, Finn's increasingly creepy behavior over the course of the episode, to the point where he stays in his house for weeks just staring at the tiny people and messing with their love lives. It's implied that he barely moved from his spot at all, not even to bathe. The fact that this is Finn we're talking about here just makes it spookier.
    • The entire soundtrack of the episode (mostly consisting of an off-tune piano) was an intentional use of something called quarter-tone music, where "off-tune" notes (notes with half-sharps, half-flats, etc.) are played along with "in-tune" notes (any note on an everyday piano), producing a spooky and dreamy effect, kinda like this. And they indeed succeeded in producing that effect.
  • "Baby Eating Fox and the Babies", from "Jake the Dad." Paused at just the right moment, a graphic description of the baby being eaten and digested can be read. It's even lampshaded when Jake realizes that the book is a lot darker than he remembers.
    • When Jakes thinks his kids died in their sleep, kids watching may not worry so much, but actual parents watching...
  • The titular Davey takes more than a little persuading before he leaves. It's one thing to put on a costume for a day or two; it's quite another to have it argue against returning to the status quo.
    • When he first starts to become the mask is fairly creepy as well. It's just him laying wide awake at night, murmuring to himself with his eyes wide open...
    "I'm Davey..."
  • Lemongrab still has the ability to contort his non-neck and rotate his head around 360 degrees, as shown by the episode "Mystery Dungeon." Lovely.
    • A manic earl, with a mouth filled with sharp fangs, asking the Ice King "How do you taste?" When the Ice King responds with "Nice, I guess," Lemongrab screams at him.
    • The promo art. It shows Ice King, Tree Trunks, Lemongrab, Shelby, and NEPTR backed up against a wall, staring fearfully up at what appears to be a giant. Ice King is clearly terrified, and is exchanging a desperate hug with Lemongrab, who stares up at the giant in shock, gripping his sword...
    • Lemongrab pulling his mouth open wide to reveal a whole mess of sharp fangs. Eeep.
    • The giant rat that comes through the floor. That in itself is creepy enough. Lemongrab literally punches the rat in the head and the rat either dies or passes out. Lemongrab shoves his face into the mouth of the rat and eats the pre-chewed pie from the rat's mouth.
  • Basically the entirety of "All Your Fault". It starts off unnerving, but once Finn and Jake go into the dungeon, it becomes downright terrifying. Lemonjon's giant organs strewn around the castle, the two-headed twitching lemon creature behind the door, the tiny screaming lemon monster whose face peels off, the four-mouthed green lemon creature that licks Jake's hand, and of course, the completely emaciated Lemongrabs that have wasted all their food to give life to these things.
    • It doesn't help that the tiny screaming thing with the peeling head sounds just like a certain other abomination.
    • Put it this way: The dungeon sequence is like a Shout-Out to the Silent Hill games, or possibly the nightmare scenes from Jacob's Ladder, with its random, freaky lemon monstrosities (a two-headed one shakes its head just like one of the monsters from SH or the film), the organs of Lemonjon strewn about, and the darkness illuminated only by light sources haphazardly placed in the area. No wonder Finn and Jake are so freaked out by that place!
    • Princess Bubblegum erasing the candy life formula from the Lemongrabs' exposed brains. They don't seem to mind in the least, but it's still pretty freaky.
      • A Freeze-Frame Bonus of this scene gives us a glimpse inside Lemongrab's brain, and we can literally read his thoughts. And unsurprisingly, some of them are downright awful. One of them reads "Call me crazy, but I think it's time for us to die." Others read unsettling, bold, all-caps things like "RAGE" and "SUFFER." Others imply that Lemongrab is legitimately paranoid and insane, and others imply that he is a pyromaniac who wants to set things on fire.
    • Just the fact that the Lemongrabs's stupidity resulted in a child's death, and Lemongrab 2 didn't even seem to care. His complete lack of facial expression was horrible.
      • However, this is much more debatable in the original Lemongrab for his future actions. It is very evident that the reason Lemongrab abused his children and possibly killed his clone in "Too Old" was because he went completely batshit insane after the death of his son Lemonjon. Especially for people so emotionally unstable/sensitive as Lemongrab, seeing your little boy die right in front of you is not an easy thing to deal with. Fridge Horror: When describing their profound joy about their newfound fatherhood, Lemongrab describes this feeling as "so pretty okay." He has been chronically depressed for so long that he's unable to adequately articulate what it feels like to experience true happiness.
  • The Magi creature from "Little Dude" is pretty freaky when he isn't in Woobie mode.
  • At the end of "Bad Little Boy", it shows that the Ice King has an entire room filled with Fionna and Cake fanfiction books, with huge ice sculptures of them in the middle. Not to mention that the room is sealed with a lock that looks like Fionna's head, and Ice King dedicating himself to finding Fionna and Cake one day. It's all very... disturbing.
  • Xergiok's torn-out eyes. And his empty sockets are somehow even worse.
  • The mutated zombies in "Simon and Marcy". To make matters worse, they are implied have been the human inhabitants of that city.
    • From that same episode, the first time we see what Simon is like under the influence of the Crown is extremely creepy. It's like someone flipped a switch and turned this quiet, sweet guy into a cackling maniac.
  • "A Glitch is a Glitch" is eleven solid minutes of nightmare fuel.
    • The "Glitch" video that the Ice King sends to Finn and Jake. The vid consists of a random emotionless woman eating her own hair. What makes it scary is just how unnerving the vid is. See it for yourself...
      • Probably because her physical reactions (gagging, glancing at the camera) are portrayed realistically, which is seriously out of place for this show.
    • The entire episode is disturbing, mostly because it's rendered in 3D.
    • "A Glitch is a Glitch" is so terrifying. You watch the inhabitants of Ooo glitch into nothingness as the scenery degenerates into blank polygons.
    • What do you get when you cross a giant spider with a rattlesnake? The stuff of nightmares.
    • No one mentions that the Ice King, usually a Harmless Villain, has come dangerously close to erasing ALMOST EVERYTHING IN THE WHOLE ADVENTURE TIME UNIVERSE???
  • GOLB, the thing that Finn flies by in "Puhoy" after he "dies".
    • Finn dancing with Roselinen. His arms actually sunk into her sides and disappeared.
    • The Blanket Dragon writhing in pain slowly before it dies. Surprising how a blanket dragon bleeding little pillows can appear so painful and graphic...
    • Heck, the episode itself is disturbing, Finn just experienced an entire life in a day and even died, and doesn't remember a thing about it. It does leave one question, was it All Just a Dream, or did that stuff really happened?
  • Bubble the air spirit's shudder-inducing speech to B-Mo at the end of "B-Mo Lost", about how from now on, he'll always be watching him everywhere he goes until the end of time. B-Mo doesn't seem overly affected by it, but it's still pretty creepy to the viewer. The subtle change from happy, heartwarming music to Psycho Strings doesn't help.
  • From "James Baxter the Horse", Finn and Jake try to cheer up people at a funeral, but leave when they realize their attempts aren't working. Then the coffin starts shaking around as if the person inside was trying to escape. It's later shown that the person was not actually being buried alive, but the truth is hardly more comforting—later in the episode, they return to the funeral, and the coffin starts shaking again... and out pops a reanimated skeleton that crawls around like something out of The Exorcist, which then begins chasing Finn and Jake around and trying to kill them.
  • Quite a bit of "The Suitor", from Peppermint Butler's demon summoning to the... creatures guarding the Soul Stone. The grand prize, however, has to go to Braco's appearance after he makes a Deal with the Devil to win Princess Bubblegum. Just....UGH.
    • There was a bit more of it too. What with his burning, bruising and bludgeoning, he get's a nice progressive mutilation to bother the audience deeply.
      • The fact that said ritual was performed in the (former) prison of the Lich brings up all kinds of Fridge Horror.
  • In The Party's Over, Isla de Senorita, the Ice King sneaked into the Candy Kingdom palace, duct taped Princess Bubblegum's mouth and woke her up with a creepy "Hey baby," with the intention of abducting her (as usual) so he can give her breakfast in bed. He does this all the time to the point that it's becoming a Running Gag, but the fact that he considers her his girlfriend even though she (for every good reason) doesn't want anything to do with him drives home how demented the crown made him. It's even creepier when you realize the "Princess Bubblegum is Really 700 Years Old" theory is true, most likely meaning she's probably been dealing with this sort of thing for a lot longer than we might have originally thought!
  • In "One Last Job" Gareth splashed Captain Banana Guard with a bottle of banana flavored drink to distract him. It worked and he was shocked that he has tasted "the forbidden flavor". It might not seem much to us but remember that the banana guards themselves are made out of bananas, so to them its like being splashed with a bottle full of blood and guts from another person in the face and getting some on your mouth.
    Banana Guard: It's delicious.
    • Just Jake's position in the entire episode; he's forced to go back to his old life of crime because his daughter is kidnapped. That's every parent's worst nightmare.
  • The Earls of Lemongrab's section of Another Five Short Graybles in which Lemongrab 1 starts to eat Lemongrab 2 because the two fought over their "son", just a toy Lemongrab, and dropped and broke it.
    • It worse after "Too Old" reveals that Lemongrab partially ate Lemongrab 2 alive and horribly mauled him to the point of deformity, then abused him and deprived him of food and medical attention.
    • It's also Harsherin Hindsight in that it foreshadows the fate of the REAL lemon children in "Too Old". Lemongrab 2 wanted to put their "son" to bed because he claims he was tired, showing that Lemongrab 2 is a caring father. But Lemongrab wanted the "son" to dance around for his amusement. And then in "Too Old", we see the Floor Show, and Lemongrab's treatement of the children in general compared to Lemongrab 2's.

    Season 5 part two 
  • In Jake Suit, the fact that Jake can control Finn's nervous system seems a bit unnerving.
  • The original title card for "Be More": [2]Geez, no wonder why they scrapped that...
  • BMO "glitching" and then throwing up is a very Adult Fear- BMO is basically a child so watching Finn and Jake rush him to the Mo Factory was the equivalent of watching two parents taking their very sick kid to the hospital.
    • Moe's emaciated condition, and his sort of Uncanny Valley appearance, especially the way his mouth moves. Softened by the fact that he is an extremely gentle, kind person, though.
    Finn: You're human too?!
    Moe: My skin is!
    • Some of the robots in the factory - they were trying to KILL Finn, Jake, and BMO!
  • Some of Marceline's transformed faces in "Sky Witch" just SCREAM this trope.
    • Maja's face at the end as well as what she is saying while making said face.
  • In "Frost & Fire", the fight between Flame Princess and Ice King goes into a dark place when we see the Ice Kingdom destroyed, its citizens fleeing for their lives, and Finn having to revive an unconscious Gunther and rescue the Ice King from the fire he himself caused. "You blew it", indeed.
  • Morbidly obese Lemongrab of "Too Old."
    • The creepy lemon child with two heads and no arms/eyes appears again. Although he looks a lot more sad than frightening this time...
    • Because Lemongrab is such a perfectionist neatfreak, it's downright unsettling to see his castle looking so dilapidated and run-down.
    • The fact that Lemongrab's toilet is a giant lemon juicer. It gets disturbing if one thinks about how that works for too long.
    • Lemongrab 2 is revealed to be alive, but his legs are gone, half of his head is gone, he moves around via a levitating hoverdisc, and he looks very thin and emaciated. Made worse by the fact that Lemongrab is starving him and depriving him of necessary medical attention.
    • Basically the entire episode? From Lemongrab abusing his own children to kicking his young son in the stomach to murdering his brother...
      • He didn't just murder his brother, he ate him ALIVE! And when he fights his way out enough to shout to his son to seek freedom and return to save the lemon kingdom, we get to watch him get shoved back in!
      • The dinner table shows that everyone has been served a small amount of food on modest-sized plates- or worse, some of the children have only one piece of bread each. But we clearly see that Lemongrab has a whole enormous feast laid out before himself. He's been hoarding almost all the food to himself, hence why Lemongrab 2 is so skinny and why his children are so hungry and unhappy.
    • Lemongrab's abuse of his children. He put shock collars on them, forced one to repeatedly punch himself in the face while forcing everyone to watch, and he literally kicked his son in the stomach repeatedly, then dragged him off.
    • THE FLOOR SHOW. The fact that Lemongrab was grinning and laughing out of pure delight as he electrocuted his own children and made them "perform" for him. The "performance" consisted of one lemon child repeatedly slapping himself in the face and another lemon child being forced to watch and emit high-pitched shrieks. Even worse because throughout the "floor show," they have looks of complete terror on their faces. Lemongrab tells them to "do it better" before electrocuting the fuck out of the poor kids:
    Lemon Child: AAAAH! AAAAAH! AAAAAH! AAAAAH!
    Lemongrab: Do it better.
    Lemon Child: AAAAAH! AAAAAH!! AAAAAAH!! AAAAAH!!!!
    Princess Bubblegum: I can't watch this...
    • Any scene where Lemongrab tries to eat his brother. Especially during the scene in the dungeon, where we only see his back, with Lemongrab 2 disappearing inside of him.
      • It's especially horrific because Lemongrab 2's hand is shown clawing desperately at Lemongrab's back for a moment, futilely trying to escape. But he becomes too weak due to his illness, and he is swallowed.
    • The scenes where Lemongrab is shown starving his children and even locking one of them IN A BATHROOM.
    • The look on Lemongrab's face as he takes the bread from his son.
    • When Lemongrab is hulking out and he clearly has the strength to smash concrete. Which makes one worry about the safety of the lemon children after PB, Finn, and Lemonhope have left...
    • Some of the lyrics of Lemon Hope's song are just ghoulish, like him mentioning that his pillow is filled with bugs and that he was literally thrown in the garbage and locked in the refrigerator.
    • The Lemon Children are really sweet kids, but some of them were just grotesque-looking, like the ones whose faces appeared to be half-melted.
  • "The Vault" finally gives us a backstory for the Green Ghost Lady who first appeared back in "The Creeps": Shoko was a mercenary sent by the Bath Boy Gang to retrieve a powerful amulet from Princess Bubblegum back when the Candy Kingdom was first being built. When she finally managed to get her hand (she was an amputee) on it, she fell from the top of the still-under-construction Candy Castle...right into a river of radioactive slime, emerging later with her arm restored, but also mutated into the freakish worm-monster we see her as as a ghost. Also, when she died as said worm monster, her body was basically consumed by what is now Finn and Jake's tree-house, meaning her skeleton has been hidden in their kitchen floorboards for hundreds of years!
    • Shoko's weird radioactive worm is pretty nightmarish.Have a look.
      • For more Fridge Horror Finn is her reincarnation, in a sense "His own body" was underneath them all that time
  • The premise of "Dungeon Train". The idea of roaming on a train forever and ever and soon becoming one of the monsters inhabiting it is disturbing.
    • And then there's there are the "bosses" who were implied to be people who endlessly roamed the dungeon. The last horrified look on their face before they died is jarring...
      • It definitely seems like some of the loot is meant to make the adventurers look more like monsters to each other. The whole train seems perfectly designed to eliminate heroes by keeping them addicted with fights and loot and pitting them against each other.
  • In "Red Starved": pretty much everything about Marceline once she goes insane from hunger. Especially her Nightmare Face...
    • The light from the green jewel transformed anyone that crosses its path into sand, killing them in the process.
    • A starving Marceline sucking the pink out of Bubblegum and leaving PB grey and shriveled afterwards. Sure, she does recover, but that was still shocking to watch.
  • The Cliff Hanger ending of "Play Date" where Jake is taken to another dimension by Keeoth who had his blood returned to him by Finn breaking Joshua's sword.
  • The zombies from "Simon and Marcy" return from the depths of Ooo in "James" to swarm PB's vessel. She sacrifices James to drive them off, but the ending shows James' zombie climbing out of the crater, leading the others out.
  • In "Root Beer Guy" not only the thought of Finn and Jake going bad, but also the idea of the guards being too stupid and incompetent to solve the case and having to have just a normal guy solve it.
  • In "Blade of Grass" when Finn wakes up to find the sword wrapped around his arm, a la The Ruins.
  • Finn acting like a creeper to Bubblegum in the beginning of "Rattleballs". The similarities to Ice King's behavior at the start of "The Party's Over, Isla De Señorita" are too much not to be intentional.
    • "I will poke your eyes out, and whenever you try to see stuff, you will think of me." Not to mention that Finn egged Rattleballs on, spreading his eye open and everything. Body Horror, much?
  • Bella Noche. If you're a wizard, anyway. He's made out of pure Anti-Magic, which, contrary to the trope's description doesn't mean magic doesn't just work on him. Oh no, he takes magic away. Taking Farm World into consideration, the world would be a very different place without magic. So just how much damage would he have done if Betty didn't put a stop to him?
    • When Simon and the gang open the time portal, we get a first hand look at what was likely the first of Ice King's many rampages.
    Ice King: WHERE'S MY BETTY?! WHERE'S MY PRINCESS?! PRINCESSSSSSS!!!
  • The entire premise of "Lemonhope Story I & II". Lemonhope's personal adventure about eventually releasing the fate of the lemon people by the cruel vast dictatorial hands of Lemongrab. A simple concept to some right? ... Its not! Lemonhope becomes a bit of a Jerk Ass in the very beginning of the first part of the episode and goes out of his way into doing whatever he wants just like the greedy Earl. He escapes from the PB who tried to groom him into a savior of the lemon people but rebukes her. He escapes and goes through various hells. From getting on board a ship that crashes into rubble, nearly starving and dying from dehydration and to top it off on that he has many random bizarre dreams that belie his own guilt. Yet, he later reconsiders in the second part returning to Castle (since turned fort) Lemongrab and goes up against the antagonistic Earl in a dramatic face off ending in what at first appears to be the horrific demise of the crooked Earl but in reality... he gets better.
    • At the end of he episode, a Flash Forward shows Ooo becoming a post-apocalyptic wasteland yet again. The Candy Kingdom is a Ghost City in a desert, Finn and Jake's tree is now thousands of stories tall, the Ice Kingdom is completely gone, but Castle Lemongrab is the same as Lemonhope left it. Fridge Horror definitely ensues.
    • PB and Lemonhope observe a Lemon person trying to escape from Castle Lemongrab: He manages to get over the wall, but he is grabbed by a flying bat creature that takes him to Fat Lemongrab's room, who executes him by eating him alive. The eating takes place offscreen, but we can hear the escapee pleading and screaming.
    • The Castle Lemongrab propaganda video straddles the line between goofy and creepy. It's intentionally So Bad, It's Good, but the subject matter is Lemongrab's children all being put into slavery, while Lemongrab tries to explain that everyone's happy now that Hope is gone, even though they clearly aren't, all in grayscale while bizarre depressing music plays in the background. It's also disturbingly reminiscent of certain real-life countries.
  • The brief Jump Scare moment in Billy's Bucket List, when Finn has a flashback which concludes with this lovely reminder of Billy being posessed by The Lich at the end of the fourth season.



Adventures of the Gummi BearsNightmareFuel/Western Animation TVAlfred J. Kwak

alternative title(s): Adventure Time With Finn And Jake
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