• 
  Roy Ward Baker

  regizor

• 
  Eric Ambler

  scenarist

• 
  Margaret Lockwood

  Frances Gray
• 
  Dane Clark

  Bill Casey
• 
  Marius Goring

  Commandant Anton Razinski
• 
  Naunton Wayne

  Dul Hedgerley
• 
  Wilfrid Hyde-White

  Dul Luke, British consul
• 
  Eugene Deckers

  Alf, the 'contact'

• 
  Olaf Pooley

  Detectiv-Interrogator
• 
  Paul Hardtmuth

  Preot
• 
  Eric Pohlmann

  Joe
• 
  Joan Haythorne

  Judy
• 
  Anthony Newley

  Operator
• 
  Jill Balcon

  Wardress
• 
  Ewen Solon

  Enemy Scientist

• 
  George Benson

  Sandwich Stand Customer
• 
  Anton Diffring

  Officer At Station Check Point.
• 
  Robert Cawdron

  Soldier At Barrier During Fire
• 
  Richard Marner

  Soldier on train
• 
  Gladys Henson

  Attendant
• 
  Patric Doonan

  Customs Man
• 
  Michael Hordern

  Lab Director Owens
• 
  John Horsley

  Customs Officer

• 
  Antony Darnborough

  producător
• 
  Reginald H. Wyer

  imagine
• 
  Alfred Roome

  montaj
• 
  Earl St. John

  producător executiv
• 
  Richard Addinsell

  coloană sonoră