Marvel has released the official movie trailer for Guardians of the Galaxy starring Chris Pratt (Moneyball), Bradley Cooper (Silver Linings Playbook), Zoe Saldana (Star Trek), and Vin Diesel (Riddick). The film was directed and co-written by James Gunn (Scooby-Doo) and is based on the Marvel comic book of the same name. Guardians of the Galaxy is slated to hit theaters on August 1, 2014, in both 2D and 3D at RealD 3D and IMAX 3D theaters.