"Paula, the ape woman, has survived the ending of CAPTIVE WILD WOMAN and is running around a creepy old sanitarium run by the kindly Dr. Fletcher, reverting to her true gorilla form every once in a while to kill somebody."
Evelyn Ankers
as Beth Mason
J. Carrol Naish
as Dr. Carl Fletcher
Samuel S. Hinds
as Coroner
Lois Collier
as Joan Fletcher
Milburn Stone
as Fred Mason
Douglass Dumbrille
as District Attorney
Acquanetta
as Paula Dupree, the Ape Woman
Nana Bryant
as Miss Gray
Pierre Watkin
as Dr. Meredith
Christian Rub
as George
Richard Davis
as Bob Whitney
Edward M. Hyans Jr.
as Willie
Alec Craig
as Caretaker
Tom Keene
as Joe, the Fingerprint Man
Vince Barnett
as Curley (archive footage / uncredited)
Clyde Beatty
as Fred Mason (in long shots) (archive footage / uncredited)
Wilson Benge
as Court Stenographer (uncredited)
John Carradine
as Dr. Sigmund Walters (archive footage / uncredited)
Diane Carroll
as Inquest Juror (uncredited)
Edward Clark
Heinie Conklin
Ray Corrigan
as Cheela (archive footage / uncredited)
Fern Emmett
as Beth's Neighbor (archive footage / uncredited)
Nolan Leary
Charles Marsh
Beatrice Roberts
Ray Walker
as Ringmaster (archive footage / uncredited)
Reginald Le Borg
Director
Bernard Schubert
Screenplay
Edward Dein
Abraham Grossman
Art Direction
Hans J. Salter
Music
Frank Skinner
Jack MacKenzie
Director of Photography
Ralph Freed
Ray Snyder
Editor
Richard Hageman
Will Cowan
Associate Producer
John B. Goodman
Vera West
Costume Design
Paul Sawtell
Music Director
Stand In
Russell A. Gausman
Set Decoration
Paul Van Loan
Henry Sucher
Ben Pivar
Executive Producer
Jack Pierce
Makeup Artist
Melville Shyer
Assistant Director
Story
Original Music Composer
Edward R. Robinson