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