Shaggy and the gang are going to see a monster movie, however Shaggy's baby sister is to young to see the movie, so they are dropping her off at a babysitter's. Once they get there, they are terrified to learn that the Sitter looks like some sort of monster, or is at least hideous. Things get even worse when a monster from a monster movie comes to life, and to top it all off a convict escaped prison and seems to be coming after the gang as well.