| Person | Type | Job | Role(s) |
|---|---|---|---|
 Alfred Roome | Crew | Editing | Editor |
Antony Darnborough | Crew | Production | Producer |
 Earl St. John | Crew | Production | Executive Producer |
 Eric Ambler | Crew | Writing | Writer |
Reginald H. Wyer | Crew | Camera | Director of Photography |
 Richard Addinsell | Crew | Sound | Original Music Composer |
 Roy Ward Baker | Crew | Directing | Director |
 Anthony Newley | Cast | Actor | Operator (uncredited) |
 Anton Diffring | Cast | Actor | Officer at Station (uncredited) |
 Dane Clark | Cast | Actor | Bill Casey |
 Dinah Sheridan | Cast | Actress | Train Passenger at Checkpoint (uncredited) |
 Eric Pohlmann | Cast | Actor | Joe - the bartender |
 Ernest Butcher | Cast | Actor | Tom - Lab Assistant (uncredited) |
 Ewen Solon | Cast | Actor | Enemy Scientist (uncredited) |
 George Benson | Cast | Actor | Sandwich Stand Customer |
 Jill Balcon | Cast | Actress | Wardress (uncredited) |
Joan Haythorne | Cast | Actress | Judy |
John Boxer | Cast | Actor | Police Sergeant at Customs Café (uncredited) |
 John G. Heller | Cast | Actor | Soldier at Station Check Point (uncredited) |
 John Horsley | Cast | Actor | Customs Officer |
 Margaret Lockwood | Cast | Actress | Frances Gray |
 Marius Goring | Cast | Actor | Commandant Anton Razinski |
 Michael Hordern | Cast | Actor | Lab Director Owens |
 Naunton Wayne | Cast | Actor | Mr. Hedgerley |
 Noel Johnson | Cast | Actor | Frank Conway (uncredited) |
 Olaf Pooley | Cast | Actor | Detective-Interrogator |
 Patric Doonan | Cast | Actor | Customs Man |
 Paul Hardtmuth | Cast | Actor | Priest |
Philo Hauser | Cast | Actor | Waiter (uncredited) |
 Richard Marner | Cast | Actor | Soldier on Train (uncredited) |
 Robert Cawdron | Cast | Actor | Soldier at Station Checkpoint (uncredited) |
 Sam Kydd | Cast | Actor | Customs Man (uncredited) |
 Wilfrid Hyde-White | Cast | Actor | Mr. Luke |
 Gladys Henson | Cast | Actress | Attendant |
 Eugene Deckers | Cast | Actor | Alf |
John Wilder | Cast | Actor | Customs Officer (uncredited) |
Daniel Brown | Cast | Train Passenger (uncredited) | |
Hyma Beckley | Cast | Café Mimosa Patron (uncredited) | |
Lance Secretan | Cast | Alan (uncredited) | |
Michael Ritterman | Cast | The ‘Tail’ (uncredited) | |
Louis Matto | Cast | Café Mimosa Waiter (uncredited) | |
 Emile Stemmler | Cast | Actor | Soldier at Station Checkpoint (uncredited) |
Robert Vossler | Cast | Day Sentry at First Checkpoint (uncredited) | |
John Gabriel | Cast | Night Field Telephone Officer (uncredited) | |
Billy Wilmot | Cast | Café Mimosa Customer (uncredited) | |
Charles Hammon | Cast | Train Passenger in Platform Line-up (uncredited) | |
Toni Frost | Cast | Stewardess (uncredited) | |
| Person | Type | Job | Role(s) |
