George C. Scott
Dan Charles Logan
Acting
Richard Basehart
Dr. Roy Caldwell
Acting
Martin Sheen
Maj. Holliford
Acting
Barnard Hughes
Dr. Spencer
Acting
Nicolas Beauvy
Chris Logan
Acting
Paul Stevens
Col. William Franklin
Acting
Stephen Young
Major Reintz
Acting
Kenneth Tobey
Col. Alan A. Nickerson
Acting
Robert Walden
Dr. Janeway
Acting
William Jordan
Major Cooper
Acting
Dabbs Greer
Dr. Thompson
Acting
John Dierkes
Bill Parker
Acting
Bette Henritze
Sarah Parker
Acting
Lou Frizzell
Dr. Spike Boynton
Acting
Ed Lauter
Simpson
Acting
Phoebe Noel
Waitress
Acting
Steve DeFrance
Ambulance Driver (uncredited)
Acting
Anna Aries
Bit Part
Acting
Fielding Greaves
Dr. Walter Steenrod, Chivington Research Laboratories
Acting
Terry Wilson
Kaufman Trucking Co. driver
Acting