Director
Irwin Allen
DIRECTOR
Stars (in credits order)
Michael Caine
Brad Crane
Katharine Ross
Capt. Helena Anderson
Richard Widmark
Gen. Slater
Richard Chamberlain
Dr. Hubbard
Olivia de Havilland
Maureen Schuester
Ben Johnson
Felix
Lee Grant
Anne MacGregor
José Ferrer
Dr. Andrews
Patty Duke
Rita
Slim Pickens
Jud Hawkins
Bradford Dillman
Maj. Baker
Fred MacMurray
Mayor Clarence Tuttle
Henry Fonda
Dr. Walter Krim
Cameron Mitchell
Gen. Thompson
Christian Juttner
Paul Durant
Morgan Paull
Dr. Newman
Alejandro Rey
Dr. Tomas Martinez
Don 'Red' Barry
Pete Harris
Elizabeth Rogers
Woman Scientist (extended version only)
Doria Cook-Nelson
Mrs. Durant
Robert Varney
Mr. Durant
Ernie F. Orsatti
Duty Officer
Patrick Culliton
Sheriff Morrison
John Furlong
Cameraman
Chris Petersen
Hal
Jerry Toomey
Eddie
Barbara Costello
Receptionist
Jenifer Taurins
Nurse (extended version only)
David Himes
Radioman (extended version only)
Mara Cook
Secretary
Joey Eisnach
Bee Boy
Stephen Powers
Radarman
Chris Capen
Lieutenant
Tony Haig
Officer #2
Bill Snider
Radarman #2
George Simmons
Nurse
Arell Blanton
Sergeant
Trent Dolan
Radio Sergeant
John Williams
Launching Officer
Steven Marlo
Pilot #1
Phil Montgomery
Mechanic
Jim Galante
Doctor (extended version only)
Frank Blair
Self
Marcia Nicholson
Captain
Arthur Space
Engineer
Chuck Hayward
Standby Engineer
Glenn Charles Lewis
Chemical Warfare Guard
Art Balinger
Radio Announcervoice
Michael Sheehan
Airman #1
Howard Culver
Airman #2
Ken Allen
Military Officeruncredited
Buzz Barbee
Briefing Guestuncredited
Al Beaudine
Gary Bohn
Controlleruncredited
Dusty Cadis
Ken Clayton
Dr. Mooreuncredited
Brent Dunsford
Technicianuncredited
Philip Ettington
Train Passengeruncredited
Marneen Fields
Gail Frank
Bob Harks
Townsmanuncredited
George Holmes
Mike Johnson
Burning Manuncredited
Jack Krupnick
Lawrence Moran
Colonel's Sonuncredited
Monty O'Grady
John Otrin
Wild Linesuncredited
Norman Palmer
Leoda Richards
Norman Stevans
Nico Stevens
Gary Wright
Officer at Missile Complexuncredited