Dr. Sigmund Walters

John Carradine

Acting

Beth Colman

Evelyn Ankers

Acting

Fred Mason

Milburn Stone

Acting

John Whipple

Lloyd Corrigan

Acting

Nurse Strand

Fay Helm

Acting

Dorothy Colman

Martha Vickers

Acting

Paula Dupree, the Ape Woman

Acquanetta

Acting

Curly

Vince Barnett

Acting

Gruen

Paul Fix

Acting

Roustabout (uncredited)

Fred Aldrich

Acting

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

Clyde Beatty

Acting

End Narrator (voice)(uncredited)

Turhan Bey

Acting

Dock Spectator (uncredited)

Eddie Borden

Acting

Cheela the Gorilla (uncredited)

Ray Corrigan

Acting

Curley (uncredited)

Russell Custer

Acting

Beth's Murdered Neighbor (uncredited)

Fern Emmett

Acting

Trapeze Artist (uncredited)

Virginia Engels

Acting

Waiter (uncredited)

Alexander Gill

Acting

Coroner (uncredited)

Gus Glassmire

Acting

Small Boy (uncredited)

Joel Goodkind

Acting

Sheriff (uncredited)

William Gould

Acting

Al (uncredited)

Al Haskell

Acting

Dock Ticket Office Clerk

Harry Holman

Acting

Ship's Captain (archive footage)

Tom London

Acting

Cop (uncredited)

Charles McAvoy

Acting

Handler (uncredited)

Frank Mitchell

Acting

Dock Worker (uncredited)

Charles Morton

Acting

Jake - Handler (uncredited)

Edward Peil Sr.

Acting

Man on Dock (uncredited)

Stanley Price

Acting

Attendant (uncredited)

Joey Ray

Acting

Roustabout (uncredited)

Cap Somers

Acting

Ringmaster (uncredited)

Ray Walker

Acting

Tony - Handler (uncredited)

Anthony Warde

Acting

Veterinarian (uncredited)

Grant Withers

Acting