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Runtime
Director
Where to Watch

Eric Braeden
as Dr Charles Forbin

Susan Clark
as Dr. Cleo Markham

Gordon Pinsent
as The President

William Schallert
as CIA Director Grauber

Georg Stanford Brown
as Dr. John F. Fisher

Willard Sage
as Dr. Blake

Alex Rodine
as Dr. Kuprin

Martin E. Brooks
as Dr. Jefferson J. Johnson

Marion Ross
as Angela Fields

Dolph Sweet
as Missile Commander

Byron Morrow
as Secretary of State
Lew Brown
as Peterson

Sid McCoy
as Secretary of Defense

James Hong
as Dr. Chin

Robert Cornthwaite
as First Scientist

Tom Basham
as Thomas L. Harrison
Leonid Rostoff
as Russian Chairman
Serge Tschernisch
as Translator
John Davey
as Military officer on phone (uncredited)

Paul Frees
as Colossus (voice) (uncredited)
Fred Holliday
as Military Computer Entry - Missile Launch (uncredited)

Robert Quarry
as Scientist (uncredited)

Don Ross
as Logan US Air Force (uncredited)

William Traylor
as Party Guest (uncredited)