The members of METALLICA will appear at Comic-Con in San Diego, California to discuss the "Metallica Through The Never" movie on Friday, July 19. The band will discuss the film, and the band has also revealed that they will play a “surprise” gig, as well. Metallica broke the news about the concert via a post on their official website. NYTimes.com reports that 500 free tickets will be distributed to the concert, a rarity at the popular annual convention. ‘Metallica Through the Never’ will premiere Sept. 27 on IMAX, with a wide 3D release to follow on Oct. 4.