| William Lundigan | ... | Col. Edward McCauley | |
| Joyce Taylor | ... | Mary McCauley | |
| Corey Allen | ... | Lt. Johnny Baker | |
| Kem Dibbs | ... | Maj. Harvey Sparkman | |
| Mary Webster | ... | Ellen Baker | |
| Louis Jean Heydt | ... | Summers | |
| Sue Carlton | ... | Patsy Sparkman | |
| Clark Howat | ... | Maj. Gordon Briggs | |
| Hal Hamilton | ... | Westlake |
| Episode Crew |
Directed by | |||
| Nathan Juran | |||
Writing credits | ||
| Kalman Phillips | (written by) | |
Produced by | |||
| Mel Epstein | .... | associate producer | |
| Lewis J. Rachmil | .... | producer | |
Cinematography by | |||
| William P. Whitley | (as William F. Whitley) | ||
Film Editing by | |||
| Joseph Silver | |||
Casting by | |||
| Henry Rackin | (uncredited) | ||
Art Direction by | |||
| Robert Kinoshita | |||
Set Decoration by | |||
| Charles S. Thompson | (as Charles Thompson) | ||
Makeup Department | |||
| Bud Sweeney | .... | makeup artist | |
Production Management | |||
| Joe Wonder | .... | production manager | |
Second Unit Director or Assistant Director | |||
| Dale Hutchinson | .... | assistant director | |
Art Department | |||
| Chesley Bonestell | .... | creator: space concepts | |
| Walter McKeegan | .... | assistant art director | |
Sound Department | |||
| Al Lincoln | .... | audio supervisor | |
| Sidney Sutherland | .... | sound editor (as Sid Sutherland) | |
Special Effects by | |||
| Thol Simonson | .... | special effects (as Cy Simonson) | |
Visual Effects by | |||
| Irving Block | .... | photographic effects | |
| Louis DeWitt | .... | photographic effects | |
| Jack Rabin | .... | photographic effects | |
Stunts | |||
| Jim Jacobs | .... | stunt double: Bill Lundigan (uncredited) | |
Costume and Wardrobe Department | |||
| Michael Tierney | .... | wardrobe | |
Music Department | |||
| Milton Lustig | .... | music editor | |
| David Rose | .... | special theme music | |
Other crew | |||
| Lawrence D. Ely | .... | technical advisor | |
| Robert Warnes Leach | .... | story editor | |
| Harry R. Sherman | .... | production coordinator (as Harry Sherman) | |
| Maxwell Smith | .... | instruments and equipment | |
| Main series | Episode guide | Full cast and crew |
| Company credits | IMDb TV section | IMDb Sci-Fi section |
*** This review may contain spoilers ***
After two weeks studying minerals on the moon, the three-man crew blast off for the space station in Earth orbit. On their way, they're hit by a small meteor and suddenly loose oxygen. They don helmets and stop the leak, then McCauley rigs a line from the oxygen fuel tank. But it's soon empty. A scientist on the station instructs them to turn their ship so the fuel tank faces the sun. This will heat and vaporize the remaining liquid oxygen, allowing them to pump it into the cabin. They make the maneuver, but calculations show that, counting the oxygen in the suit tanks, they've bought only enough time for one man to make it back alive. McCauley breaks a couple of pencils in half and they draw straws. The winner, at McCauley's insistence, puts on his helmet, and the losers set about writing their last letters home. But sitting behind his two doomed crew-mates, watching as they weaken by the minute, is two much for the young crewman. He removes his helmet. McCauley relents. All or nothing. They put on their helmets and hope for the best.
This is the first appearance of the space station we saw construction started on in episode three, and the second episode based on a ships loss of oxygen.