Revolta

Revolta is the main antagonist of ''Scooby Doo and the Ghoul School. ''She is the witch of the web and plans to make the students at the ghoul school part of her evil squad permanently. Her main magic is mind control via spider bats who put web-like hypnosis headphones on the victim and Revolta issues commands through that headphone which hypnotizes the victims. She is also a good potions maker and can brew potions that make others evil permanently. She is presumed destroyed at the film's conclusion.