Margaret Lockwood
Role: Frances Gray
Dane Clark
Role: Bill Casey
Marius Goring
Role: Commandant Anton Razinski
Naunton Wayne
Role: Mr. Hedgerley
Wilfrid Hyde-White
Role: Mr. Luke
Olaf Pooley
Role: Detective-Interrogator
Gladys Henson
Role: Attendant
Paul Hardtmuth
Role: Priest
Michael Hordern
Role: Lab Director Owens
George Benson
Role: Sandwich Stand Customer
Eric Pohlmann
Role: Joe - the bartender
John Horsley
Role: Customs Officer
Patric Doonan
Role: Customs Man
Jill Balcon
Role: Wardress (uncredited)
Hyma Beckley
Role: Café Mimosa Patron (uncredited)
John Boxer
Role: Police Sergeant at Customs Café (uncredited)
Ernest Butcher
Role: Tom - Lab Assistant (uncredited)
Daniel Brown
Role: Train Passenger (uncredited)
Robert Cawdron
Role: Soldier at Station Checkpoint (uncredited)
Anton Diffring
Role: Officer at Station (uncredited)
Toni Frost
Role: Stewardess (uncredited)
John Gabriel
Role: Night Field Telephone Officer (uncredited)
Charles Hammon
Role: Train Passenger in Platform Line-up (uncredited)
Philo Hauser
Role: Waiter (uncredited)
John G. Heller
Role: Soldier at Station Check Point (uncredited)
Noel Johnson
Role: Frank Conway (uncredited)
Sam Kydd
Role: Customs Man (uncredited)
Richard Marner
Role: Soldier on Train (uncredited)
Louis Matto
Role: Café Mimosa Waiter (uncredited)
Anthony Newley
Role: Operator (uncredited)
Michael Ritterman
Role: The ‘Tail’ (uncredited)
Lance Secretan
Role: Alan (uncredited)
Dinah Sheridan
Role: Train Passenger at Checkpoint (uncredited)
Ewen Solon
Role: Enemy Scientist (uncredited)
Emile Stemmler
Role: Soldier at Station Checkpoint (uncredited)
Robert Vossler
Role: Day Sentry at First Checkpoint (uncredited)
John Wilder
Role: Customs Officer (uncredited)
Billy Wilmot
Role: Café Mimosa Customer (uncredited)