Lem is the main protagonist of Planet 51. He is an alien high school student who has recently acquired a job at the local observatory, and lives with his parents in Glipforg. He hopes to have a normal life with the girl of his dreams and long-time neighbor, Neera, and live a normal life. That is until the arrival of their planet's first contact with NASA astronaut Charles T. "Chuck" Baker, leading to a life-changing experience.