An alien is sent to our planet as an invading advance party; he resurrects a scientist and a nurse in order for them to help him in his plan: to bring the great monsters back to life and with them dominate the world. Through a book, a policeman discovers the creatures of Nature that interest the alien Varnoff and he, one by one, tracks down and recovers the lifeless bodies of Dracula, the werewolf, the mummy and Frankenstein's monster.