Sam Rockwell, Moon (2009)
Sam Rockwell plays a man (also named Sam) doing a long-haul solo stretch at a mining colony on the moon; his loneliness and boredom soon give way to mental and physical deterioration—and things really get existentially hairy when Sam realizes he’s a clone. Rockwell is fantastic playing opposite mostly, well, himself—as well as a disembodied Kevin Spacey (who voices the moon base’s AI).
