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