Michael Caine
Brad Crane
Acting
Katharine Ross
Capt. Helena Anderson
Acting
Richard Widmark
Gen. Thaddeus Slater
Acting
Richard Chamberlain
Dr. Hubbard
Acting
Olivia de Havilland
Maureen Schuester
Acting
Ben Johnson
Felix
Acting
Lee Grant
Anne MacGregor
Acting
José Ferrer
Dr. Andrews
Acting
Patty Duke
Rita
Acting
Slim Pickens
Jud Hawkins
Acting
Bradford Dillman
Maj. Baker
Acting
Fred MacMurray
Maj. Clarance Tuttle
Acting
Henry Fonda
Dr. Walter Krim
Acting
Cameron Mitchell
Gen. Thompson
Acting
Christian Juttner
Paul Durant
Acting
Morgan Paull
Dr. Newman
Acting
Alejandro Rey
Dr. Martinez
Acting
Don 'Red' Barry
Pete Harris
Acting
Elizabeth Rogers
Woman Scientist
Acting
Doria Cook-Nelson
Mrs. Durant
Acting
Robert Varney
Mr. Durant
Acting
Ernie F. Orsatti
Duty Officer
Crew
Patrick Culliton
Sheriff Morrison
Acting
John Furlong
Cameraman
Acting
Chris Petersen
Hal
Acting
Jerry Toomey
Eddie
Acting
Barbara Costello
Receptionist / Nurse
Acting
Jenifer Taurins
Nurse
Acting
David Himes
Radioman
Acting
Mara Cook
Secretary
Acting
Joey Eisnach
Bee Boy
Acting
Stephen Powers
Radarman
Acting
Chris Capen
Lieutenant
Acting
Tony Haig
Officer #2
Acting
Bill Snider
Radarman #2
Acting
George Simmons
Nurse
Acting
Arell Blanton
Sergeant
Acting
Trent Dolan
Radio Sergeant
Acting
John Williams
Launching Officer
Acting
Steven Marlo
Pilot #1
Acting
Phil Montgomery
Mechanic
Acting
Jim Galante
Doctor
Acting
Frank Blair
Self
Acting
Marcia Nicholson
Captain
Acting
Arthur Space
Engineer
Acting
Chuck Hayward
Standby Engineer
Acting
Glenn Charles Lewis
Chemical Warfare Guard
Acting
Art Balinger
Radio Announcer
Acting
Michael Sheehan
Airman #1
Acting
Howard Culver
Airman #2
Acting
Buzz Barbee
Briefing Guest (uncredited)
Acting
Ken Clayton
Dr. Moore (uncredited)
Acting
Marneen Fields
Train Passenger (uncredited)
Crew
Bob Harks
Townsman (uncredited)
Acting
Mike Johnson
Burning Man (uncredited)
Crew
Jack Krupnick
Train Passenger (uncredited)
Acting
Lawrence Moran
Colonel's Son (uncredited)
Acting
Monty O'Grady
Briefing Guest (uncredited)
Acting
John Otrin
Wild Lines (uncredited)
Acting
Leoda Richards
Briefing Guest (uncredited)
Acting
Norman Stevans
Briefing Guest (uncredited)
Acting