0_planet-51-8A new trailer for the upcoming science fiction comedy Planet 51 can be viewed in high definition on Moviefone. Telling the story of an astronaut who lands on an alien world, Planet 51 features the voice talents of Dwayne Johnson, Jessica Biel, Justin Long, Seann William Scott, Gary Oldman, and John Cleese. The CGI flick opens in theaters on November 20th, 2009.