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