The U.S. has handed over control of its nuclear defense system to the Colossus supercomputer designed by scientist Dr. Charles Forbin. It soon becomes clear, that the now-sentient Colossus is far more intelligent than its creator realized—with the fate of the world hanging in the balance.

Eric Braedenas Dr Charles Forbin
Susan Clarkas Dr. Cleo Markham
Gordon Pinsentas The President
William Schallertas CIA Director Grauber
Georg Stanford Brownas Dr. John F. Fisher
Willard Sageas Dr. Blake
Alex Rodineas Dr. Kuprin
Martin E. Brooksas Dr. Jefferson J. Johnson
Marion Rossas Angela Fields
Dolph Sweetas Missile Commander