[[SuperRobotMonkeyTeamHyperforceGo It's a show]] about [[EverythingsBetterWithMonkeys robotic monkeys]]. It also has a horrific {{Eldritch Abomination}}s at every corner and [[NightmareFuel plenty more terrors]].
* In one episode which parodied ''TheWickerMan'', there is a secret society worshiping the bad guy who you can see the organs of, and two of its main members are a sweet couple who had been around for four seasons before this came up.
* The episode with Wonder Fun Meat World, which featured strange meat that caused odd rashes and is addictive. And their mascot is really an Eldritch Abomination who ate humans and could stand up to the Super Robot. [[NauseaFuel It vomits humans when defeated]].
* The episode with [[LoonyFan Gyrus Krinkle]], an {{expy}} of Norman Bates, ''in a kids show''.
* The most terrifying episode of all however, has to be ''I, Chiro'', especially when he gets possessed.
** "I, Chiro". Good grief, "I, Chiro"…
* The Skeleton King can be really scary sometimes, usually when he's mistreating his servants. And having MarkHamill do the voice is part of the equation.
* The three-headed MonsterClown from the Circus Episode.
* The fact that the series ends on a {{cliffhanger}}. Meaning ol' Skeleton King is a KarmaHoudini.
* The episode which plays homage to Creator/HPLovecraft with a [[EldritchAbomination Cthulhu]] {{Expy}} [[spoiler: that's revealed to be Skeleton King's ''[[EyeScream eye]]''.]]
* Skeleton King ''[[spoiler: worm.]]''
* [[http://www.youtube.com/watch?feature=player_detailpage&v=d4RkOzpK6ro#t=196s Master Zan's true form]] from Antauri's Masters.
* Skeleton King creates this in-show for the team in In The Grip of Evil.
* Oi, several episodes were Nightmare Fuel, Circus of Ooze anyone?
** Pretty much half the final season. Lesse... Secret Society for starters. Then Fire of Hate/Soul of Evil. I mean, between Sprx, the resurrection ritual, and Skeleton King's new look? Good grief.
*** Don't forget Incident On Ranger 7, Ghosts of Shuggazoom, and Demon Of The Deep.
* The Probe from Ghost in the Machinder.
* The Skeleton King Droid. Relentless, brutal, and nigh invulnerable. And then there's that voice… *shudder*
* OH GOOD GRIEF SKELETON KING! WITH THE TORTURE CHAMBER AND ALL THE MONKEYS RELEASING HORRIBLE SCREAMS!
* Virus!Gibson was incredibly creepy in "Thingy".
* Here's a nice picture for you. A space ship is de-powered and lost in outer space. The team finds the ship and learns that the ship's crew had been there for possibly decades as gray husks and walking corpses that moan and shamble around a la VideoGame/DeadSpace style. The team defeats them by breaking their glass face masks on their helmets which, because they are outside the ship, caused the putrid air that's been festering in their bodies for decades to be forcibly sucked out. The bodies are so fragile that the suction causes their faces to explode. You know, [[WhatDoYouMeanItsForKids FOR KIDS!]]
-->Zombie: *suction sound* "Wwwwwwwaaaaaaaaahhhhhhhhhhhh." *peshck*
* The first episode to be aired, "Chiro's Girl", ends with Sakko having Skeleton King's mechanical eye forcibly and audibly removed from his right eye socket.
* [[spoiler: Skele-Mandarin is mutated after being swallowed by the Dark One Worm and living in its stomach for a few months, disfigured by acid and with a ''claw'' having grown where his arm had been severed.]]