baddies on this list are legitimately frightening, and you can ask any child who has ever had the misfortune of seeing them in action if you don't believe it. These eight cartoon villains are the stuff of nightmares, so be sure to leave the light on when you watch them!
Judge Claude Frollo, "The Hunchback of Notre Dame"
Claude Frollo likes Esmerelda. In fact, he likes her a lot. A real lot. Go ahead, just ask him. This creepy dude lets his obsession with the beautiful gypsy drive him to madness, but to be honest, he may have been a little mad before that. He did kill Quasimodo's mom, after all. Claude is terrifying not just for his actions, but for his demented devotion to his pursuit of Esmerelda. Plus, his "Hellfire" song is just plain creepy.
Captain Hook, "Peter Pan"
Captain Hook makes little kids walk the plank. That should really tell you all you need to know about how frightening this guy is. He is willing to let sharks eat kids. If it weren't for the nimble moves of Peter Pan and an assist from Tiger Lily, it's likely that the Captain's reign of terror would have gone unchecked. Fortunately, the old Codfish himself had a fear of crocodiles that led to his demise.
All of the Disney villains answer to one master, and that master is Chernabog. The Devil incarnate, Chernabog sits on a perch on inscrutable power, dealing doom and destruction to anyone he wishes. While his time in the animated universe is brief, at least as far as screen time goes, his influence is far reaching, and his segment in "Fantasia" is definitely legitimately terrifying.
Ursula, "The Little Mermaid"
Ursula is the master of the ultimate in Faustian bargains. Her cruel tricks prey upon the naivete of the young and foolish, which in this case would be Ariel, the titular mermaid. By offering her an agreement which Ariel couldn't possibly satisfy, Ursula practically guaranteed herself ownership of Ariel forever. But, to be fair, her "Poor Unfortunate Souls" song is one of the best in Disney history, so she deserves a little slack.
Megatron rules, OK? Let's get that out of the way. But for little kids in the '80s, Megatron was the ultimate in evil. Sure, StarScream was cool and all, but Megatron, with his terse and forceful orders, was as evil as evil got. Only as adults could we realize how awesome he was. At the time, however, he was the principle villain in our nightmares, and the most nefarious force when it came to battling Optimus Prime and Co.
Shredder, "Teenage Mutant Ninja Turtles"
Oroku Saki is a scary dude, with his mask and his claws and his guttural English. But maybe deep down, he wants to hang out with the Turtles. Shredder could just be a poor misfit, shunned by the world, looking over those pizza-eating Ninja Turtles and wishing they would invite him over for a pizza party or something. But nah, on second thought, Shredder is a scary dude who wants to help unleash the fury of dimension X.
He's a withered old mummy, who also calls upon ancient power in order to become an ultra-powerful bad guy. His seemingly never-ending war with Lion-O and the ThunderCats hinged on the fact that Mumm-Ra was pretty much undead and couldn't really be killed, which puts him pretty high on the cartoon bad guy Olympus. His transformation scenes likely caused more than a few nightmares for young kids back in the day.
Maleficent, "Sleeping Beauty"
Maleficent is the prime example of what happens when you shun a party guest. She wasn't invited to the celebration of Aurora's birth, and as a result of this snub, she cursed the girl to prick her finger on a spinning wheel and die on her sixteenth birthday. Only with the help of some fairy godmother magic was Aurora able to dodge the fatal bullet. Well, that and some help from her Prince, who did the heavy lifting in the ultimate Disney battle with dragon-form Maleficent.