12-year-old Sean Crenshaw and his best friend Patrick are die hard monster fanatics. Along with their friend Horace (nicknamed Fat Kid),junior high tough guy Rudy, Sean's kid sister Phoebe, and little Eugene they come together and talk monsters. But when Dracula, Frankenstein, The Wolf Man, The Gill Man, and The Mummy come to their small town to get an amulet to control the world, Sean leads his friends into action to protect their town from the forces of evil.