Scientist Stephen Reinhart (Nick Adams) travels to a small town where he plans to visit his fiancée Susan Witley (Suzan Farmer) and meet her parents. Oddly, when he arrives, the townspeople are unfriendly. At Susan's parents' estate, her father, Nahum (Boris Karloff), is acting suspiciously and her mother, Letitia (Freda Jackson), is hidden away in a bedroom. When Stephen and Susan begin investigating the strange behavior in town, they realize that a radioactive meteor is to blame