"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
Russell A. Gausman
Hans J. Salter
Music Director
Edward Dmytryk
Director
Milton Carruth
Editor
Ben Pivar
Associate Producer
Jack Pierce
Makeup Artist
Neil P. Varnick
Original Story
George Robinson
Director of Photography
Ralph M. DeLacy
Art Direction
Henry Sucher
Screenplay
Ted Fithian
Griffin Jay
John B. Goodman
Melville Shyer
Assistant Director
Bernard B. Brown
Sound Director
Stunts
William Hedgcock
Sound
Sam Perry
Music
Ralph Freed
Charles Previn
Frank Skinner
Paul Van Loan
David Klatzkin
Vera West
Costume Design