Planet 51 is a 2009 3D computer-animated science fiction comedy film directed by Jorge Blanco, written by Joe Stillman, and starring Dwayne Johnson, Jessica Biel, Justin Long, Gary Oldman, Seann William Scott and John Cleese. An international co-production by Spanish, British and American companies, and produced by Madrid-based Ilion Animation Studios and HandMade Films, the film was originally acquired for North American distribution by New Line Cinema, but then sold to Sony Pictures before completion.


On Planet 51, green extraterrestrials live peacefully in a society reminiscent of the United States during the 1950s. One day, a mysterious spacecraft lands in town. NASA astronaut Charles "Chuck" Baker emerges from it and is shocked to find the planet inhabited. Chuck escapes to the town's planetarium, where he meets teenage alien Lem, who works there part-time. Realizing Chuck is not a threat, Lem agrees to help return him to his spacecraft before command module Odyssey in Planet 51's orbit departs for Earth and leaves him stranded. Planet 51's army, led by the paranoid General Grawl, arrives to inspect the spacecraft. Grawl, after Baker's MP3 player is accidentally started, deduces that the astronaut is an alien invader bent on turning the planet's population into zombies, and a manhunt ensues.