• 
  John Frankenheimer

  regizor

• 
  David Seltzer

  scenarist

• 
  Armand Assante

  John Hawks
• 
  Robert Foxworth

  Dr. Robert Verne
• 
  Talia Shire

  Maggie Verne
• 
  Richard Dysart

  Isley
• 
  Victoria Racimo

  Ramona Hawks
• 
  Kevin Peter Hall

  Mutant bear

• 
  Mia Bendixsen

  Girl
• 
  Bob Terhune

  Rescuer
• 
  Burke Byrnes

  Father
• 
  George Clutesi

  M'Rai
• 
  Everett Creach

  Kelso (as Everett L. Creach)
• 
  Evans Evans

  Cellist
• 
  Charles H. Gray

  Sheriff

• 
  Lyvingston Holmes

  Black Woman (as Lyvingston Holms)
• 
  Graham Jarvis

  Shusette
• 
  Tom McFadden

  Pilot
• 
  Johnny Timko

  Boy