Dan Charles Logan

George C. Scott

Acting

Dr. Roy Caldwell

Richard Basehart

Acting

Maj. Holliford

Martin Sheen

Acting

Dr. Spencer

Barnard Hughes

Acting

Chris Logan

Nicolas Beauvy

Acting

Col. William Franklin

Paul Stevens

Acting

Major Reintz

Stephen Young

Acting

Col. Alan A. Nickerson

Kenneth Tobey

Acting

Dr. Janeway

Robert Walden

Acting

Major Cooper

William Jordan

Acting

Dr. Thompson

Dabbs Greer

Acting

Bill Parker

John Dierkes

Acting

Sarah Parker

Bette Henritze

Acting

Dr. Spike Boynton

Lou Frizzell

Acting

Simpson

Ed Lauter

Acting

Waitress

Phoebe Noel

Acting

Ambulance Driver (uncredited)

Steve DeFrance

Acting

Bit Part

Anna Aries

Acting

Dr. Walter Steenrod, Chivington Research Laboratories

Fielding Greaves

Acting

Kaufman Trucking Co. driver

Terry Wilson

Acting