Marvel Entertainment announced Friday that actor Bradley Cooper will be the voice of Rocket Raccoon in the upcoming film “Guardians of the Galaxy,” which is set to debut Aug. 1, 2014. Cooper joins Chris Pratt as Star Lord, Zoe Saldana as Gamora, Dave Bautista as Drax the Destroyer. Though the role of Groot has not officially been cast, rumor has it Vin Diesel has it pretty much locked up.