Metalocalypse is an animated tv series on Adult Swim. It has been described as "Spinal Tap meets Scooby-Doo meets Norway". Metalocalypse follows the exploits of the part-American/part-Scandinavian metal band Dethklok. They are so popular that their fans will do anything their songs tell them, even if it means death. The band's concerts are notoriously violent. The series often has real-life musicians doing guest voices on the show. Among these are James Hetfield and Kirk Hammett of Metallica, Jeff Loomis, Steve Smyth, and Warrel Dane of Nevermore, Arch Enemy guitarist Michael Amott, King Diamond, and Cannibal Corpse frontman George 'Corpsegrinder' Fisher. Additionally, every episode features several passing references to other real-world metal bands in the form of names, places, or general behavior on the part of the characters. Dethklok, the in-show band, also endorses several real-world music products, including Krank Amplification, Gibson guitars, EMG pickups, and Line 6 gear.