The Ape (1940)

Director: William Nigh
Cast: Boris Karloff, Dorothy Vaughan, Gene O'Donnell, Gertrude Hoffmann, Henry Hall, Jessie Arnold, Maris Wrixon, Selmer Jackson

Synopsis:

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?