Donald Meek

Character: Dr. Crabtree

John Hamilton

Character: Insp. Carr

Robert Middlemass

Character: Boris Seminoff

Thelma Tipson

Character: Dolly Demarest

Walter Fenner

Character: Ian Stevens

Jane Bramley

Character: Mae Norton

Frank McNellis

Character: Monitor Man (uncredited)

Harry Tyler

Character: Assistant Director (uncredited)

Herschel Mayall

Character: Medical Examiner (uncredited)