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One of the Enterprise's shuttlecraft crashes on a dangerous planet, threatening the lives of several of the crew members, in this episode of the popular science fiction series. The shuttle Galileo, under Mr. Spock's command, falls victim to an unexpected disaster, stranding its crew of seven in an inhospitable environment. While Captain Kirk, still aboard the Enterprise, wishes to organize a rescue mission, he is under strict orders to proceed with the starship's mission, delivering medication to a suffering planet. As time runs out, the captain must choose between the lives of countless civilians and those of seven of his most trusted crew members. Meanwhile, on the planet's surface, Spock and the others must fight for their lives against both the elements and the approach of hostile native life forms, while seeking some way to return to the Enterprise.