John Carradine
Dr. Sigmund Walters
Acting
Evelyn Ankers
Beth Colman
Acting
Milburn Stone
Fred Mason
Acting
Lloyd Corrigan
John Whipple
Acting
Fay Helm
Nurse Strand
Acting
Martha Vickers
Dorothy Colman
Acting
Acquanetta
Paula Dupree, the Ape Woman
Acting
Vince Barnett
Curly
Acting
Paul Fix
Gruen
Acting
Fred Aldrich
Roustabout (uncredited)
Acting
Clyde Beatty
Fred Mason (in long shots) (archive footage / uncredited)
Acting
Turhan Bey
End Narrator (voice)(uncredited)
Acting
Eddie Borden
Dock Spectator (uncredited)
Acting
Ray Corrigan
Cheela the Gorilla (uncredited)
Acting
Russell Custer
Curley (uncredited)
Acting
Fern Emmett
Beth's Murdered Neighbor (uncredited)
Acting
Virginia Engels
Trapeze Artist (uncredited)
Acting
Alexander Gill
Waiter (uncredited)
Acting
Gus Glassmire
Coroner (uncredited)
Acting
Joel Goodkind
Small Boy (uncredited)
Acting
William Gould
Sheriff (uncredited)
Acting
Al Haskell
Al (uncredited)
Acting
Harry Holman
Dock Ticket Office Clerk
Acting
Tom London
Ship's Captain (archive footage)
Acting
Charles McAvoy
Cop (uncredited)
Acting
Frank Mitchell
Handler (uncredited)
Acting
Charles Morton
Dock Worker (uncredited)
Acting
Edward Peil Sr.
Jake - Handler (uncredited)
Acting
Stanley Price
Man on Dock (uncredited)
Acting
Joey Ray
Attendant (uncredited)
Acting
Cap Somers
Roustabout (uncredited)
Acting
Ray Walker
Ringmaster (uncredited)
Acting
Anthony Warde
Tony - Handler (uncredited)
Acting
Grant Withers
Veterinarian (uncredited)
Acting