Obsada:

• Michael Caine Dr. Bradford Crane
• Katharine Ross Capt. Helena Anderson
• Richard Widmark Major General Thalius Slater
• Richard Chamberlain Dr. Hubbard
• Olivia de Havilland Maureen Schuster
• Ben Johnson Felix
• Lee Grant Anne MacGregor
• José Ferrer Dr. Andrews
• Patty Duke Rita
• Slim Pickens Jud Hawkins
• Bradford Dillman Major Baker
• Fred MacMurray Mayor Clarence Tuttle
• Henry Fonda Dr. Walter Krim
• Cameron Mitchell General Thompson
• Christian Juttner Paul Durant
• Morgan Paull Dr. Newman
• Alejandro Rey Dr. Martinez
• Don 'Red' Barry Pete Harris
• Doria Cook-Nelson Mrs. Mary Durant
• Robert Varney Mr. Durant
• Patrick Culliton Sheriff Morrison
• Ernie F. Orsatti Duty Officer
• John Furlong Cameraman
• Chris Petersen Hal
• Jerry Toomey Eddie
• Mara Cook Sekretarka
• Joey Eisnach Bee Boy
• Stephen Powers Radarman
• Chris Capen Lieutenant
• Tony Haig Officer #2
• Bill Snider Radarman #2
• George F. Simmons Pielęgniarka
• Arell Blanton Sergeant
• Trent Dolan Radio Sergeant
• John Williams Launching Officer
• Phil Montgomery Mechanic
• James Turley Reverend
• Frank Blair On sam
• Steven Marlo Pilot #1
• Marcia Nicholson Captain
• Arthur Space Engineer
• Chuck Hayward Standby Engineer
• Glenn Charles Lewis Chemical Warfare Guard
• Art Balinger Radio Announcer
• Michael Sheehan Airman #1
• Howard Culver Airman #2
• Barbara Costello Receptionist / Nurse
• Marneen Fields Train Passenger
• Jim Galante Doktor
• David Himes Radioman
• Elizabeth Rogers Scientist
• Jenifer Taurins Pielęgniarka