• 
  Richard Egan

  David Sheppard
• 
  Herbert Marshall

  Dr. Van Ness
• 
  Philip Van Zandt

  Dr. Pierre Elzevir
• 
  David Alpert

  Dr. Peter Burden
• 
  Byron Kane

  Dr. Carter
• 
  Michael Fox

  Dr. Hubertus
• 
  William Schallert

  Engle
• 
  Jean Dean

  Marna Roberts (as Jeanne Dean)

• 
  Constance Dowling

  Joanna Merritt
• 
  Marian Richman

  Helen
• 
  Stephen Roberts

  Maj. Howard (as Steve Roberts)
• 
  Valerie Vernon

  Mme. Elzevir
• 
  John Wengraf

  Dr. Zeitman
• 
  Tom Daly

  Senator

• 
  Harry Sukman

  departament sunet

• 
  Michael Fox

  miscellaneous crew
• 
  Ivan Tors

  producător
• 
  William Ferrari

  design de producţie
• 
  Victor A. Gangelin

  set decorator
• 
  Ivan Tors

  scriitor