Nightmare Fuel: Wander over Yonder
- Wander's expressions in "The Fugitives" as he tries to resist helping are pretty disturbing. The lighting, angles, and the fact that in at least one shot his fur looks more ragged and sharp don't help.
- Lord Hater's appearance was deliberately designed to be intimidating, and he can be scary when he gets angry. Even Cloud Cuckoolander Wander has been shown being visibly frightened by him.
- The eerie backgrounds in "The Pet", Sylvia being all alone not knowing where Wander is, and the Jump Scare at the end.
- Just looking at the wreckage inside the ship, with piles upon piles of bones, spacesuits and sleeping pods ripped to shreds (with one particular spacesuit clearly showing where the monster stabbed one of its claws right through the helmet), and the real Captain Tim's Apocalyptic Log, just imaging how the crew all died and were eaten is pretty nightmarish, to say the least.
- Wander finally figures that Capt Tim isn't really pet material when the critter sticks his tongue down his throat to try and rip out his heart.
- The episode prior to Wander finding "Captain Tim" has a more ominous soundtrack (it sounds more like other episodes when Wander discovers him).
- Lord Hater's ability to intimidate is pretty much played completely straight in "The Prisoner." He was willing to let his ship blow up in order to get Peepers to admit that he (Peepers) was wrong about capturing Wander being easy. Not to mention the fact that Hater's plan throughout the episode was to torture Wander. And he ends up giving Peepers the seizure of a lifetime.
- Wander as a bad guy in...well, "The Bad Guy." Sure, it's just an act, and he's hamming it up the whole time, but all that growling and snarling can sometimes seem a little too convincing...
- Added with a little Fridge Horror when you notice that Sylvia finally has to take the fake mustache off him in order to get him to drop the act. He doesn't remove it, she does, and when she does he suddenly goes slack. For a little bit, was the Wander we know and love just gone?
- The title enemy in "The Troll" constantly getting larger and more disgusting looking simply from the angry reactions to his remarks.
- Wander's increasing Sanity Slippage from wanting to see what's in the titular box of "The Box".
- "GIVE ME THE BOX."
- In both "The Hat" and "The Bounty", Wander and Sylvia GET SWALLOWED ALIVE! In very grotesque form, too, especially in "The Hat".
- Jeez, where to begin in "The Ball":
Sylvia: I know you're upset that Buster ate the planet! Heck, so are the rest of these folks! But destroying him and us is not the answer! We have to flee!Wander: That's what I'm doing! I'm facing this problem...HEAD-ON!!!
- The inhabitants thought about nowhere to go except the way No Party Like a Donner Party, even Wander and Sylvia were even shocked by this idea.
- Averted; this was the second time Wander has gone in a Sanity Slippage (third if you count "The Fugitives").
- Buster may be adorable, but he becomes highly terrifying from the inhabitants' perspective with all the mass destruction and monstrous close-ups.
- Near the end, after all his plans to save the planet ended in failure, Wander just snaps and takes control of the ship, presumably to ram it against Buster. Thankfully, it wasn't the case, but it's still frightening to see Buster trying to chew on the ship as Wander screams his head off while piloting it.
- Time Bomb! Sylvia, anyone?
- The climax of "The Lonely Planet," especially once Janet tries to drown Sylvia in a chasm and eat her.
- Near the end of "The Fancy Party", just as Lord Hater is about to be given power by the queen, it turns out that she's actually a demonic body surfer who wants to possess Hater's body for the millenium! If it weren't for Wander doing the Heimlich, we would've ended up with a very evil being possessing him!
- That's nothing. Think if she possessed Wander like she wanted to do.
- When the entity leaves Queen Entozoa's body, it bursts out of her mouth, which opens impossibly wide as her eyes bug out of their sockets. Additionally, we get to see her corpse after the entity leaves.
- "The Void" has Wander grow and Sylvia mysteriously shrink. Giant Wander picks tiny Sylvia up and says that she's so small and so cute, he could just eat her up. Literally! And he starts to make chomping noises almost like he WAS going to eat her!
- While the "Take a Step Inside Your Mind" song is incredibly catchy, it's kind of terrifying to see Wander essentially force Sylvia to sing and dance along with the song. She literally becomes Wander's puppet!
- Think about "The Gift II: The Giftening" from Lord Hater's P.O.V: His day is going as usual, shouting at his subordinates for incompetence. However, you find one who doesn't respond, and then he turns around to reveal that he has turned from an average soldier to a happy person who constantly laughs and says "Happy!" all the time. You check security footage, and discover It's your nemesis, giving them gifts and turning them into the same beings as the one Watchdog you watched earlier. Your commander goes to investigate with a team, but before you know it, he has also succumbed to the power of the gift. The worst part must be when Hater opens the door, sees a happy Peepers, and then turns to see Wander with a wide smile, taking out a gift from his hat...
- The first Watchdog going bat*** crazy on Commander Peepers when his gift gets taken away from him.
- The episode from Wander's perspective is less frightening, until the fake ending when Sylvia realizes Wander gave Hater new gloves and an improved Watchdog army. And he literally uses them to ruin Christmas town.
- We get a hefty dose of Adult Fear in "The Toddler" when Huckleberry Knucklehead ends up on one of the upper floors of the mall, falls down so he is teetering over the edge, and then starts reaching over the railing for a bright red mall clock on the ground floor...
- Near the end of "The Stray," it's revealed that Little Bits is a Bounty Hunter who hypnotizes her targets with her Ridiculously Cute Critter appearance. Sylvia and Little Bits then both attempt to get Wander's attention with Puppy-Dog Eyes, which slowly goes further and further into Uncanny Valley territory. Even Wander ends up getting creeped out by it.
Wander: Sylvia, I think something's wrong with your eyes.
- It's Played for Laughs, but "The Date" has Lord Hater basically coercing his date who is Sylvia in disguise into accepting his marriage proposal by threatening to destroy all the planets in the universe if she refuses. Sure, Hater ends up cancelling the wedding, but at the end of the episode, he's searching for another date. Who's to say he couldn't try to pull the same stunt again?
Lord Hater: No pressure.
- In "The Buddies", the Sand Snapper. Dear God.
- In "The Funk", the Mooplexians' revenge on Hater and Peepers crosses the line between this and Creepy Awesome.
- That scene during "The Rider" when the space worm slowly creeps up on Wander is utterly terrifying. It's somewhat mitigated by the fact that said space worm is shown to be a rather polite and affable ally who speaks in an English accent.
- Lord Dominator herself, Word of God doesn't even try to hide that she's not a funny character and in some promo screenshots Wander of all people is outright afraid of her.
- And while The Reveal at the end of "The Greater Hater" shows her to be rather affable and dorky, that does little to mitigate the fact that she is the single most dangerous villain in the show. Without so much as flinching, she delivers a Curb-Stomp Battle to all four of the main characters, including an angry Lord Hater. Even Peepers flooding the ship with magma didn't seem to faze her.
- If you have any sort of entomophobia, you will be terrified by the scene in "The Night" where a bunch of centipedes crawl over a panicking Wander, the latter unable to do anything about it. But there's some Nightmare Retardant when one of the centipedes remarks that it forgot its purse in the most cheery and nonthreatening voice you can imagine.
- The electric squid the dentist uses for anesthesia looks an awful lot like a Facehugger.
- Forget that, how about the dentist himself? His head is a giant mouth, with realistic teeth and gums, and his cheery voice just sounds a bit...off. He's not malevolent and he's rather affable, but the fact that he isn't even meant to be a monster of any sort somehow just makes it worse.
- Dr. Screwball Jones's Tickle Torture. It's more terrifying than it sounds,
- The state Wander's in when his personality parts are torn away in "The Wanders", just standing there, completely unresponsive with Blank White Eyes. Even worse, his ending comment implies he was fully aware through all of that, and could probably feel his personality being slowly torn apart without any idea of how or why it was happening.