Jessica Biel, Seann William Scott, Justin Long and Dwayne "The Rock" Johnson will be the voices for the animated characters in the film Planet 51, according to The Hollywood Reporter.
The adventure comedy was written by Joe Stillman, who also wrote Shrek. In the film, the inhabitants of Planet 51 are in fear of an alien invasion.
New Line Cinema recently acquired the film rights to the project, which has a budget of $60 million. Planet 51 is expected to open in theatres on July 24, 2009.