- 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)
- John Boxer - Police Sergeant at Customs Café (uncredited)
- Ernest Butcher - Tom - Lab Assistant (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)
- 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)
- Roy Ward Baker
- Eric Ambler
- Earl St. John
Margaret Lockwood hace el papel de Frances Gray.
Dane Clark interpreta a Bill Casey en la película.
Marius Goring interpreta a Commandant Anton Razinski en la película.
Naunton Wayne interpreta a Mr. Hedgerley en la película.
Wilfrid Hyde-White interpreta a Mr. Luke en la película.
Eugene Deckers hace el papel de Alf.
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 hace el papel de Customs Man.
Joan Haythorne interpreta a Judy en la película.
Jill Balcon hace el papel de Wardress (uncredited).
Hyma Beckley hace el papel de Café Mimosa Patron (uncredited).
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 interpreta a Soldier at Station Checkpoint (uncredited) en la película.
Anton Diffring interpreta a Officer at Station (uncredited) en la película.
Toni Frost hace el papel de Stewardess (uncredited).
John Gabriel interpreta a Night Field Telephone Officer (uncredited) en la película.
Charles Hammon interpreta a Train Passenger in Platform Line-up (uncredited) en la película.
Philo Hauser hace el papel de Waiter (uncredited).
John G. Heller interpreta a Soldier at Station Check Point (uncredited) en la película.
Noel Johnson interpreta a Frank Conway (uncredited) en la película.
Sam Kydd hace el papel de Customs Man (uncredited).
Richard Marner hace el papel de Soldier on Train (uncredited).
Louis Matto interpreta a Café Mimosa Waiter (uncredited) en la película.
Anthony Newley interpreta a Operator (uncredited) en la película.
Michael Ritterman interpreta a The ‘Tail’ (uncredited) en la película.
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 interpreta a Soldier at Station Checkpoint (uncredited) en la película.
Robert Vossler hace el papel de Day Sentry at First Checkpoint (uncredited).
John Wilder hace el papel de Customs Officer (uncredited).
Billy Wilmot interpreta a Café Mimosa Customer (uncredited) en la película.
Capítulo disponible en las siguientes plataformas:
