Lem is just an average teenager working on getting the girl and furthering his career at the local planetarium - except that he s an alien. At least to U.S. astronaut Captain Charles T. Baker who lands on Lem s planet hoping for a quick flag plant and a hasty return to earth and his millions of screaming fans. But on this alien planet the media has tagged spacemen as brain-eating, zombie-creating monsters, causing Baker to run for his life and into Lem s house. Now it s up to the green native to get the clumsy astronaut back to his spaceship before military dictator General Grawl and mad scientist Professor Kipple manage to exterminate the Earthly visitor.