John Carradine
Dr. Sigmund Walters
Evelyn Ankers
Beth Colman
Milburn Stone
Fred Mason
Lloyd Corrigan
John Whipple
Fay Helm
Nurse Strand
Martha Vickers
Dorothy Colman
Acquanetta
Paula Dupree, the Ape Woman
Vince Barnett
Curly
Paul Fix
Gruen
Fred Aldrich
Roustabout (uncredited)
Clyde Beatty
Fred Mason (in long shots) (archive footage / uncredited)
Turhan Bey
End Narrator (voice)(uncredited)
Eddie Borden
Dock Spectator (uncredited)
Ray Corrigan
Cheela the Gorilla (uncredited)
