Anthrax drummer Charlie Benante is back with a new all star jam, though this one is from a while ago. The footage comes from Benante, guitarist John 5, and Metallica guitarist Kirk Hammett all jamming Black Sabbath's "Supernaut" backstage during the second Fear FestEvil in 2015.
If you're looking for more Benante-related jams, check out the man himself alongside Testament guitarist Alex Skolnick, and Suicidal Tendencies bassist Roberto "Ra" Diaz doing a Rush cover (or two Rush covers).