Dr Charles Forbin

Eric Braeden

Acting

Dr. Cleo Markham

Susan Clark

Acting

The President

Gordon Pinsent

Acting

CIA Director Grauber

William Schallert

Acting

Dr. John F. Fisher

Georg Stanford Brown

Acting

Dr. Blake

Willard Sage

Acting

Dr. Kuprin

Alex Rodine

Acting

Dr. Jefferson J. Johnson

Martin E. Brooks

Acting

Angela Fields

Marion Ross

Acting

Missile Commander

Dolph Sweet

Acting

Secretary of State

Byron Morrow

Acting

Peterson

Lew Brown

Acting

Secretary of Defense

Sid McCoy

Acting

Dr. Chin

James Hong

Acting

First Scientist

Robert Cornthwaite

Acting

Thomas L. Harrison

Tom Basham

Acting

Russian Chairman

Leonid Rostoff

Acting

Translator

Serge Tschernisch

Acting

Military officer on phone (uncredited)

John Davey

Acting

Colossus (voice) (uncredited)

Paul Frees

Acting

Military Computer Entry - Missile Launch (uncredited)

Fred Holliday

Acting

Scientist (uncredited)

Robert Quarry

Acting

Logan US Air Force (uncredited)

Don Ross

Acting

Party Guest (uncredited)

William Traylor

Acting