The movie Planet 51 is a 2009 animated science-fiction film that follows the story of Captain Chuck Baker, an astronaut who lands on a planet that is inhabited by little green aliens, who are all convinced that they are the only intelligent life-form in the universe.
As he explores this new world, Chuck realizes that he has landed on a planet that is very similar to the 1950s in America, complete with white picket fences, soda shops, and teenagers cruising around in hot rods. However, his mission takes a sudden turn when he discovers that the planet is preparing for an alien invasion – and he is the alien they are planning to capture.
Determined to get back to his own planet, Chuck teams up with a young alien named Lem, who is eager to help him find his spaceship and get back home. Along the way, they encounter numerous obstacles and challenges, including a paranoid scientist who believes that Chuck poses a threat to their way of life, and a villainous general who will stop at nothing to capture him.
As they race against time to escape from the planet before the invasion begins, Chuck and Lem form a bond that helps them overcome their differences and work together to save the planet from destruction – and ultimately, to ensure that Chuck can return home safely.