 Tom TryonCapt. Richmond Talbot | Capt. Richmond Talbot |
 Brian KeithMaj. Gen. John M. Vanneman | Maj. Gen. John M. Vanneman |
 Edmond O'BrienMcClosky aka 'Mac' | McClosky aka 'Mac' |
 Dany SavalLyrae | Lyrae |
 Bob SweeneySen. Henry McGuire | Sen. Henry McGuire |
 Tommy KirkWalter Talbot | Walter Talbot |
 Kent SmithSecretary of the Air Force | Secretary of the Air Force |
 Sarah SelbyMrs. Talbot | Mrs. Talbot |
 Nancy KulpNutritionist Officer | Nutritionist Officer |
 Bert RemsenBrennan | Brennan |
 Harp McGuireFederal Security Driver | Federal Security Driver |
 Simon ScottMedical Officer | Medical Officer |
 Robert BrubakerSpace Flight Technician (uncredited) | Space Flight Technician (uncredited) |
| WWalt DavisAir Force Officer (uncredited) | Air Force Officer (uncredited) |
 Douglas EvansColonel (uncredited) | Colonel (uncredited) |
 Sally FieldBeatnik Girl in Lineup (uncredited) | Beatnik Girl in Lineup (uncredited) |
| MMichael GarrettControl Board Technician (uncredited) | Control Board Technician (uncredited) |
 Bob HastingsMotorist (uncredited) | Motorist (uncredited) |
| JJonathan HoleHotel Clerk (uncredited) | Hotel Clerk (uncredited) |
 John HollandJoe McCord (uncredited) | Joe McCord (uncredited) |
| WWilliam HudsonSpace Flight Technician (uncredited) | Space Flight Technician (uncredited) |
 Kenner G. KempConventioneer in Hotel Lobby (uncredited) | Conventioneer in Hotel Lobby (uncredited) |
| Nancy KulpSpace Flight Nutritionist (uncredited) | Space Flight Nutritionist (uncredited) |
 Muriel LandersFat Lady (uncredited) | Fat Lady (uncredited) |
| Harp McGuireFederal Security Driver (uncredited) | Federal Security Driver (uncredited) |
 Karen NorrisBridge Player (uncredited) | Bridge Player (uncredited) |
 Nelson OlmstedPolice Officer Dennis (uncredited) | Police Officer Dennis (uncredited) |
 Jeffrey SayreConventioneer in Hotel Lobby (uncredited) | Conventioneer in Hotel Lobby (uncredited) |
| BBert StevensConventioneer in Hotel Lobby (uncredited) | Conventioneer in Hotel Lobby (uncredited) |
| CChet StrattonCaptain (uncredited) | Captain (uncredited) |
