Planet 51 is a galactic sized animated alien adventure comedy revolving around American astronaut Captain Charles "Chuck" Baker, who lands on Planet 51 thinking he's the first person to step foot on it. To his surprise, he finds that this planet is inhabited by little green people who are happily living in a white picket fence world reminiscent of a cheerfully innocent 1950s America, and whose only fear is that it will be overrun by alien invaders...like Chuck! With the help of his robot companion "Rover" and his new friend Lem, Chuck must navigate his way through the dazzling, but bewildering, landscape of Planet 51 in order to escape becoming a permanent part of the Planet 51 Alien Invaders Space Museum. The film is directed by Jorge Blanco, written by Joe Stillman, and produced by Guy Collins and Ignacio Perez Dolset.
The film is scheduled for release on November 20, 2009 by Sony Pictures Worldwide via their TriStar Pictures division. In November 2007, New Line Cinema had picked up the film's domestic distribution rights; the studio itself was to release the film in the summer of 2009. However, the film’s producers insisted on a November release. TriStar Pictures became the film's home after New Line Cinema became a division of Warner Bros.