Dr. Bernard Adrian is a kindly scientist who seeks to cure a young woman's polio. He needs human spinal fluid to complete the formula for his experimental serum. Meanwhile, a vicious circus ape has broken out of its cage, and is terrorizing the townspeople. Can there be a connection?
Boris Karloff
Maris Wrixon
Gene O'Donnell
Dorothy Vaughan
Henry Hall
Selmer Jackson
Gertrude Hoffmann
Jessie Arnold
Billy Bletcher
Harry C. Bradley
George Cleveland
Ray Corrigan
Pauline Drake
Mary Field
Gibson Gowland
Julia Griffith
I. Stanford Jolley
Stan Jolley
Jack Kennedy
Donald Kerr
Philo McCullough
Buddy Swan
Minerva Urecal