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