Voices are cast for the animated sci-fi film “Planet 51.”  Dwayne “The Rock” Johnson, Seann William Scott Jessica Biel and Justin Long will be the voices.

The story focuses on a group of residents on the eponymous planet who fear an alien invasion. Johnson will play astronaut Capt. Charles “Chuck” Baker, who arrives from Earth and confirms their worst fears. He’s forced to steer clear of capture so he can find his spaceship and return home.

Long is the voice of Lem, the local who Chuck befriends. Biel will voice Neera, the film’s female protagonist and Lem’s love interest. Scott is the voice of Lem’s sidekick, skiff.