• 
  Walter Grauman

  regizor

• 
  Edward Asner

  Saul Wiener
• 
  Ray Milland

  Professor Samuel Constable
• 
  Virginia Christine

  Helga
• 
  Gene Tierney

  Lenore Constable
• 
  John G. Jones

  Professor Samuel Constable
• 
  Bill Hickman

  Enemy agent
• 
  John Carradine

  Mr. Bosch

• 
  Pamelyn Ferdin

  Mary Constable
• 
  George Macready

  Dr. Frank Ferguson
• 
  William Beckley

  Arnold Bessmer
• 
  Ivor Barry

  Dr. Paul Cryder
• 
  Barbara Dana

  Tina Cryder
• 
  Don Murray

  Dr. Alex Lauder

• 
  Jack Martin Smith

  art director

• 
  Charles B. Fitzsimons

  miscellaneous crew
• 
  Walter Grauman

  producător
• 
  L.B. Abbott

  special effects
• 
  Paul Gallico

  scriitor
• 
  Luther Davis

  scriitor