Richard Conte

Bill Locklin

Rona Anderson

Julia Jackson

Russell Napier

Supt. John Harrington

Sylva Langová

Hilde Heller, chief spy

Colin Gordon

Harry Martin - reporter

Donald Bisset

Editor Harris

John King-Kelly

Spy Henchman

Bernard Rebel

Vinson - Spy Henchman

Arnold Marlé

Prof. Leon Dushenko

John Horsley

Det. Sgt. Gibson

Jane Welsh

Supt. McCollum - sanitarium

Aimée Delamain

Mrs. Henley

Ken Hughes