John Carradine (37)

Dr. Sigmund Walters

Evelyn Ankers (24)

Beth Colman

Milburn Stone (38)

Fred Mason

Lloyd Corrigan (42)

John Whipple

Fay Helm (34)

Nurse Strand

Martha Vickers (18)

Dorothy Colman

Acquanetta (21)

Paula Dupree, the Ape Woman

Vince Barnett (40)

Curly

Paul Fix (42)

Gruen

Fred Aldrich (38)

Roustabout (uncredited)

Clyde Beatty (39)

Fred Mason (in long shots) (archive footage / uncredited)

Turhan Bey (21)

End Narrator (voice)(uncredited)

Eddie Borden (55)

Dock Spectator (uncredited)

Ray Corrigan (41)

Cheela the Gorilla (uncredited)

Russell Custer (43)

Curley (uncredited)

Fern Emmett (47)

Beth's Murdered Neighbor (uncredited)

Virginia Engels

Trapeze Artist (uncredited)

Alexander Gill

Waiter (uncredited)

Gus Glassmire (63)

Coroner (uncredited)

Joel Goodkind

Small Boy (uncredited)

William Gould (57)

Sheriff (uncredited)

Al Haskell (56)

Al (uncredited)

Harry Holman (71)

Dock Ticket Office Clerk

Tom London (53)

Ship's Captain (archive footage)

Charles McAvoy (58)

Cop (uncredited)

Frank Mitchell (38)

Handler (uncredited)

Charles Morton (35)

Dock Worker (uncredited)

Edward Peil Sr. (60)

Jake - Handler (uncredited)

Stanley Price (50)

Man on Dock (uncredited)

Joey Ray (38)

Attendant (uncredited)