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