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