A demon monster from outer space invades the Earth and plans to do a great deal of evil things to everyone around him. It is up to Detective Rock, Nelly and others to stop him. Will The Rock be able to stop this creature? The demon monster uses the wolfman, Frankenstein's monster, Dracula, Tor, and a female zombie to do its bidding. It also uses Dino Man and other monsters to try to conquer the world.