"An insane scientist doing experimentation in glandular research becomes obsessed with transforming a female gorilla into a human...even though it costs human life."
John Carradine
as Dr. Sigmund Walters
Evelyn Ankers
as Beth Colman
Milburn Stone
as Fred Mason
Lloyd Corrigan
as John Whipple
Fay Helm
as Nurse Strand
Martha Vickers
as Dorothy Colman
Acquanetta
as Paula Dupree, the Ape Woman
Vince Barnett
as Curly
Paul Fix
as Gruen
Fred Aldrich
as Roustabout (uncredited)
Clyde Beatty
as Fred Mason (in long shots) (archive footage / uncredited)
Turhan Bey
as End Narrator (voice)(uncredited)
Eddie Borden
as Dock Spectator (uncredited)
Ray Corrigan
as Cheela the Gorilla (uncredited)
Russell Custer
as Curley (uncredited)
Fern Emmett
as Beth's Murdered Neighbor (uncredited)
Virginia Engels
as Trapeze Artist (uncredited)
Alexander Gill
as Waiter (uncredited)
Gus Glassmire
as Coroner (uncredited)
Joel Goodkind
as Small Boy (uncredited)
William Gould
as Sheriff (uncredited)
Al Haskell
as Al (uncredited)
Harry Holman
as Dock Ticket Office Clerk
Tom London
as Ship's Captain (archive footage)
Charles McAvoy
as Cop (uncredited)
Frank Mitchell
as Handler (uncredited)
Charles Morton
as Dock Worker (uncredited)
Edward Peil Sr.
as Jake - Handler (uncredited)
Stanley Price
as Man on Dock (uncredited)
Joey Ray
as Attendant (uncredited)
Cap Somers
Ray Walker
as Ringmaster (uncredited)
Anthony Warde
as Tony - Handler (uncredited)
Grant Withers
as Veterinarian (uncredited)
Ira Webb
Set Decoration
Hans J. Salter
Music Director
Russell A. Gausman
Edward Dmytryk
Director
George Robinson
Director of Photography
Jack Pierce
Makeup Artist
John B. Goodman
Art Direction
Neil P. Varnick
Original Story
Milton Carruth
Editor
Ben Pivar
Associate Producer
Ralph M. DeLacy
Griffin Jay
Screenplay
Henry Sucher
Ted Fithian
Sam Perry
Music
Paul Van Loan
Frank Skinner
Bernard B. Brown
Sound Director
Ralph Freed
Stunts
Charles Previn
Melville Shyer
Assistant Director
William Hedgcock
Sound
David Klatzkin
Vera West
Costume Design