Returning from the Moon with valuable spore samples the crew of MR7 are rendered unconscious. Earth sends a rescue mission but a decision has to be made that could put everyone's life at risk.

Col. McCauley is training a young cadet who wants to be an astronaut, and pushes the young man almost to his limit. When an onboard accident knocks out McCauley, the nervous young cadet has to bring the craft back to Earth on his own.