He keeps human life in test tubes, and prowls at night in the skin of an ape!

Directed by
William Nigh

Writing credits
Adam Shirk (play) (as Adam Hull Shirk)
Curt Siodmak 
(adaptation) (as Kurt Siodmak)
Curt Siodmak (screenplay) (as Kurt Siodmak) and
Richard Carroll (screenplay)

Cast (in credits order) verified as complete
Boris Karloff ....Dr. Bernard Adrian
Maris Wrixon ....Miss Frances Clifford
Gene O'Donnell ....Danny Foster
Dorothy Vaughan....Mother Clifford
Gertrude Hoffman ....Jane, Adrian's Housekeeper (as Gertrude W. Hoffman)
Henry Hall ....Sheriff Jeff Halliday
Selmer Jackson ....Dr. McNulty

rest of cast listed alphabetically:
Jessie Arnold ....Mrs. Brill, Willie's Mother (uncredited)
Harry C. Bradley....Quinn, The Druggist (uncredited)
George Cleveland ....Mr. Howley, Circus Caretaker (uncredited)
Ray Corrigan ....The Ape (uncredited)
Pauline Drake ....Young Girl (uncredited)
Mary Field ....Mrs. Mason (uncredited)
Gibson Gowland ....Posse Member (uncredited)
I. Stanford Jolley ....Ape Trainer (uncredited)
Jack Kennedy....Deputy Tomlin (uncredited)
Donald Kerr ....Citizen Carrying Mauled Ape Trainer (uncredited)
Philo McCullough ....Henry Mason (uncredited)
Buddy Swan ....Young Boy (uncredited)

Keywords: horror, sci-fi