The Big Four: Metallica, Slayer, Megadeth, Anthrax, presented by NCM Fathom and BY Experience features nearly 4 hours of live performances and behind-the-scenes from the Sonisphere Festival in Sofia, Bulgaria. If you missed it on June 22nd, there will be a second screening of the film in select theaters on June 24th at 7:30pm (local time). Check out if The Big Four encore is playing near you and to buy tickets HERE