Photo: Metallica @ Outside Lands 2012

Metallica hosted their now-annual Orion Music + More festival earlier this month and gave fans in attendance the thrill-of-a-lifetime by performing their classic 1983 debut album Kill ‘Em All in full as the mystery band from Baltimore (as Hetfield introduced them before grabbing his flying V) under the name Dehaan. Notably, the set fell on the 30th anniversary of the iconic metal album’s release. Hit the lights and check out the killer footage of the surprise performance below.