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