It’s Halloween at Webster High School and it’s Chyna Parks’ first day in the Mutant Program, where monsters go to school with normal high school students. Chyna is Medusa so she fits right in with her new Mutant Program friends: Olive, a mad scientist, Fletcher, a vampire and Angus, a zombie. However, Lexi and the normal kids are terrified of the mutants, so Gibson pairs everybody off to help prepare for the Halloween dance.