Cast
Jill Balcon
Wardress (uncredited)
Philo Hauser
Waiter (uncredited)
Eugene Deckers
Alf
John Gabriel
Night Field Telephone Officer (uncredited)
Noel Johnson
Frank Conway (uncredited)
Olaf Pooley
Detective-Interrogator
Michael Hordern
Lab Director Owens
George Benson
Sandwich Stand Customer
Ernest Butcher
Tom - Lab Assistant (uncredited)
Anton Diffring
Officer at Station (uncredited)
Sam Kydd
Customs Man (uncredited)
Dane Clark
Bill Casey
Marius Goring
Commandant Anton Razinski
Margaret Lockwood
Frances Gray
Patric Doonan
Customs Man
John G. Heller
Soldier at Station Check Point (uncredited)
Gladys Henson
Attendant
Paul Hardtmuth
Priest
Dinah Sheridan
Train Passenger at Checkpoint (uncredited)
Emile Stemmler
Soldier at Station Checkpoint (uncredited)
Wilfrid Hyde-White
Mr. Luke
Eric Pohlmann
Joe - the bartender
John Horsley
Customs Officer
Anthony Newley
Operator (uncredited)
Ewen Solon
Enemy Scientist (uncredited)
Naunton Wayne
Mr. Hedgerley
Richard Marner
Soldier on Train (uncredited)