NASA responds to John F. Kennedy's challenge of landing a man on the moon with a group of new astronauts for the Gemini Program, who work toward the eventual lunar voyage with a series of risky and groundbreaking earth-orbit missions.
The tragic death of Apollo's first three astronauts during a pre-launch test haunts the spacecraft's designers, as they struggle to come to terms with what happened, and find a way to save the moon program.