Peter Graves

Character: Dr. Ed Wainwright

Peggie Castle

Character: Audrey Aimes

Morris Ankrum

Character: Gen. John Hanson

Than Wyenn

Character: Frank Johnson

Thomas Browne Henry

Character: Col. Tom Sturgeon

Richard Benedict

Character: Cpl. Mathias

James Seay

Character: Capt. James Barton

John Close

Character: Maj. Everett

Don C. Harvey

Character: State Police Car 254 Officer

Larry J. Blake

Character: Roadblock Sergeant

Eilene Janssen

Character: William's Date

Hylton Socher

Character: Frank, grainary platoon soldier

Frank Wilcox

Character: Gen. Short

Douglas Evans

Character: Editor Norman Taggart

Paul Grant

Character: William Summerfield, teen boy

Richard Emory

Character: Lieutenant

Hank Patterson

Character: Dave

Steve Warren

Character: Observation Post #3 Soldier

Frank Connor

Character: Observation Post #1 Soldier

Don Eitner

Character: Observation Post #2 Soldier

Rayford Barnes

Character: Chuck, granary platoon soldier

Kirk Alyn

Character: Bomber Pilot

Bill Baldwin

Character: TV Announcer (uncredited)

Frank Chase

Character: Helicopter Pilot (uncredited)

Joe Cranston

Character: Soldier (uncredited)

Patricia Dean

Character: Red Cross Representative

James Douglas

Character: Army Sentry (uncredited)

Paul Frees

Character: Helicopter Pilot (voice)

Lyle Latell

Character: Police Lt. MacKenzie (uncredited)

Dennis Moore

Character: Police Dispatcher KLP646

Zon Murray

Character: Roadblock Sentry Confiscating Camera

Alan Reynolds

Character: Agricultural Agent

Ralph Sanford

Character: Man with Red Cross Representative [extra]

Bert Stevens

Character: Col. Hill [bit]

Alan Wells

Character: Headquarters Sergeant