Sam Bell (Sam Rockwell) is a blue-collar astronaut employee of Lunar Industries, sent to the moon to man a helium-3 harvesting station. He’s in the final weeks of his three-year stint as the harvester’s solo human supervisor, with only his overly attentive robotic companion GERTY (voiced by Kevin Spacey) for company. Sam whiles away the hours running on his treadmill, watching Mary Tyler Moore reruns, and watering his plant collection. His satellite connection to earth has failed, meaning he can only send and receive prerecorded messages; he watches a video from his wife and child, telling him how eager they are to see him again. After three years alone in space, he’s not in the greatest shape emotionally or physically. One day, he dodges GERTY and heads out to the mine, only to find another mangled astronaut in a wrecked tractor—an astronaut who looks exactly like him.