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)

Russell Custer

Curley (uncredited)

Fern Emmett

Beth's Murdered Neighbor (uncredited)

Virginia Engels

Trapeze Artist (uncredited)

Alexander Gill

Waiter (uncredited)

Gus Glassmire

Coroner (uncredited)

Joel Goodkind

Small Boy (uncredited)

William Gould

Sheriff (uncredited)

Al Haskell

Al (uncredited)

Harry Holman

Dock Ticket Office Clerk

Tom London

Ship's Captain (archive footage)

Charles McAvoy

Cop (uncredited)

Frank Mitchell

Handler (uncredited)

Charles Morton

Dock Worker (uncredited)

Edward Peil Sr.

Jake - Handler (uncredited)

Stanley Price

Man on Dock (uncredited)

Joey Ray

Attendant (uncredited)

Cap Somers

Roustabout (uncredited)

Ray Walker

Ringmaster (uncredited)

Anthony Warde

Tony - Handler (uncredited)

Grant Withers

Veterinarian (uncredited)