Planet 51

In this animated spoof of the E.T. story, our hero is an American astronaut who lands on Planet 51 (a reference to Area 51 and the Roswell UFO incident), intending to claim it for America. Much to his surprise, the planet is already inhabited by curious green people-like creatures, who naturally speak perfect English. He ropes in a young boy to help him return to his spaceship, but they run out of time as the army draws closer, determined to deal with the alien threat.