• 
  Joseph Sargent

  regizor

• 
  James Bridges

  scenarist

• 
  Eric Braeden

  Dr. Charles Forbin
• 
  Susan Clark

  Dr. Cleo Markham
• 
  Gordon Pinsent

  Presedintele
• 
  Dolph Sweet

  Missile Commander
• 
  Marion Ross

  Angela Fields
• 
  James Hong

  Dr. Chin

• 
  Georg Stanford Brown

  Dr. John F. Fisher
• 
  Sid McCoy

  Secretary of Defense
• 
  Alex Rodine

  Dr. Kuprin
• 
  William Schallert

  CIA Director Grauber
• 
  Robert Cornthwaite

  First Scientist
• 
  Lew Brown

  Peterson
• 
  Tom Basham

  Thomas L. Harrison

• 
  Martin E. Brooks

  Dr. Jefferson J. Johnson (as Martin Brooks)
• 
  Susan Clark

  Dr. Cleo Markham
• 
  Byron Morrow

  Secretary of State
• 
  Leonid Rostoff

  Russian Chairman
• 
  Willard Sage

  Dr. Blake

• 
  D.F. Jones

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