- Slim Pickens - Jud Hawkins
- Bradford Dillman - Maj. Baker
- Fred MacMurray - Maj. Clarance Tuttle
- Henry Fonda - Dr. Walter Krim
- Cameron Mitchell - Gen. Thompson
- Christian Juttner - Paul Durant
- Morgan Paull - Dr. Newman
- Alejandro Rey - Dr. Martinez
- Don 'Red' Barry - Pete Harris
- Elizabeth Rogers - Woman Scientist
- 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 / Nurse
- Jenifer Taurins - Nurse
- David Himes - Radioman
- 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
- Frank Blair - Self
- 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
- Buzz Barbee - Briefing Guest (uncredited)
- Ken Clayton - Dr. Moore (uncredited)
- Marneen Fields - Train Passenger (uncredited)
- Bob Harks - Townsman (uncredited)
- Mike Johnson - Burning Man (uncredited)
- Jack Krupnick - Train Passenger (uncredited)
- Lawrence Moran - Colonel's Son (uncredited)
- Monty O'Grady - Briefing Guest (uncredited)
- John Otrin - Wild Lines (uncredited)
- Leoda Richards - Briefing Guest (uncredited)
- Norman Stevans - Briefing Guest (uncredited)
-
Phil Karlson
-
Ted Sherdeman, Walter Roeber Schmidt
-
Irving H. Levin
Capítulo disponible en las siguientes plataformas:
