Writer/director Joss Whedon s big-screen follow-up to his cult TV series Firefly finds the crew of the space freighter Serenity trying to keep the mysterious sister of the ship s doctor safe from the sinister Alliance. As the craft s heroic captain attempts to avoid an Alliance operative and figure out the secret of the enigmatic girl the fate of the universe lies in the balance. Extraordinary sci-fi adventure stars Nathan Fillion Gina Torres Adam Baldwin Sean Maher and Summer Glau.