• 
  Charles Crichton

  regizor

• 
  Jack Whittingham

  scenarist

• 
  Cornell Borchers

  Inga
• 
  Yvonne Mitchell

  Sonja
• 
  Armin Dahlen

  Franz
• 
  Alexander Knox
• 
  Geoffrey Keen

  Marks
• 
  Liam Redmond

• 
  Eddie Byrne
• 
  Theodore Bikel

  Josip
• 
  Ferdy Mayne

  dr. Muller
• 
  André Mikhelson

  prof. Miran
• 
  Pamela Stirling

  Poncet
• 
  Michel Ray

  Toni
• 
  Gilgi Hauser

• 
  Martin Stephens

  Hans
• 
  Marianne Walla

  Matron
• 
  Philo Hauser
• 
  Guy Deghy
• 
  Carl Duering
• 
  Richard Molinas
• 
  John Welsh
• 
  John Schlesinger
• 
  Nicholas Stuart
• 
  Alec McCowen
• 
  Orest Orloff
• 
  Ilona Ference
• 
  Randal Kinkead
• 
  Hans Elwenspoek
• 
  Howard Knight
• 
  Anthony Richmond
• 
  Frederick Schrecker
• 
  Guy Standeven
• 
  Martin Keller
• 
  Krystyna Rumistrzewicz
• 
  Mark Gübhard
• 
  Maria Leontovitsch
• 
  Dorit Welles
• 
  Dora Lavrencic
• 
  Arthur Cortez
• 
  Anthony John
• 
  Hans Kuhn

• 
  Michael Balcon

  producător
• 
  Michael Truman

  producător
• 
  Otto Heller

  imagine
• 
  Georges Auric

  coloană sonoră