 After crash-landing on a remote island, his passenger Bill Summers (John Archer) and his black manservant/valet, Jefferson Jackson (Mantan Moreland) take refuge in a mansion owned by Dr. Miklos Sangre (Henry Victor) and his wife Alyce (Patricia Stacey).The quick-witted yet easily frightened manservant soon becomes convinced the mansion is haunted by zombies, and confirms this with some of the doctor's hired help.With the help of Barbara Winslow (Joan Woodbury), the stranded group begins to find out what mysterious events are taking place in the mansion.