The inhabitants of Planet 51 live in fear of alien invasion. Their paranoia is realized when an astronaut arrives from Earth. Befriended by a young resident, he has to avoid capture in order to recover his spaceship and try to return home. —IMDb
While its concept is a clever idea and there's at least one funny bit, it could certainly do without the mindless pop culture references and typical gross-out gags. They just ain't 50's.
by the end i found it boring. It stared off interesting but by the end just went the kid way.