Dr. Sigmund Walters

Beth Colman

Fred Mason

John Whipple

Nurse Strand

Dorothy Colman

Paula Dupree, the Ape Woman

Curly

Gruen

Roustabout (uncredited)

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

End Narrator (voice)(uncredited)

Dock Spectator (uncredited)

Cheela the Gorilla (uncredited)

Curley (uncredited)

Beth's Murdered Neighbor (uncredited)

Trapeze Artist (uncredited)

Waiter (uncredited)

Coroner (uncredited)

Small Boy (uncredited)

Sheriff (uncredited)

Al (uncredited)

Dock Ticket Office Clerk

Ship's Captain (archive footage)

Cop (uncredited)

Handler (uncredited)

Dock Worker (uncredited)

Jake - Handler (uncredited)

Man on Dock (uncredited)

Attendant (uncredited)

Roustabout (uncredited)

Ringmaster (uncredited)

Tony - Handler (uncredited)

Veterinarian (uncredited)