Rockers Metallica hit Comic-Con to pump their film, “Through the Never” over the weekend and played a secret show at the Spreckels Theatre in San Diego. Spies said Bradley Cooper was in a balcony “playing air guitar,” and fans also spotted in the crowd included Olivia Munn and Joel Kinnaman, Saints QB Drew Brees and Judas Priest frontman Rob Halford. As a tribute to the geek convention, the band even played the theme to “Star Wars.”