Trailer
Cast
Susan Clark
Dr. Cleo Markham
Georg Stanford Brown
Dr. John F. Fisher
Martin E. Brooks
Dr. Jefferson J. Johnson
Robert Cornthwaite
First Scientist
Willard Sage
Dr. Blake
Sid McCoy
Secretary of Defense
James Hong
Dr. Chin
Paul Frees
Colossus (voice) (uncredited)
Gordon Pinsent
The President
William Schallert
CIA Director Grauber
Alex Rodine
Dr. Kuprin
Dolph Sweet
Missile Commander
Robert Quarry
Scientist (uncredited)
Don Ross
Logan US Air Force (uncredited)
Eric Braeden
Dr Charles Forbin
Marion Ross
Angela Fields
Byron Morrow
Secretary of State
Tom Basham
Thomas L. Harrison
William Traylor
Party Guest (uncredited)