Metalocalypse is a flash animated comedy that follows the exploits of a fictitious half American - half Scandinavian death metal band known as Dethklok. The band and its members are huge the world over, but incredibly stupid - a death metal version of Spinal Tap. Watch as they leave a trail of destruction and mayhem in their wake with their ear-melting onslaught of metal! The band enjoys a popularity level unheard of in reality, ranking as the seventh largest economy on Earth. The band's popularity is such that impressionable fans will do anything its songs tell them to, even if that means death, which is usually the case.
Growing annoyed with Offdensen's neglecting them in favor of work, Dethklok unwittingly double-books a gig in both Israel and Syria, putting the entire world in danger. Offdensen gets visibly angry and yells at the band for the first time in the entire series, going so far as to order them out of the room while conducting a planning session trying to fix the mess the band has created.
Toki tries to reunite Rockzo's band, and make his life more successful by investing all of Dethklok's vacation fund into the ultimate Zazz Blammymatazz reunion. Dethklok becomes actively engaged to the success of the concert due to the fact that Toki wasted all of the band's vacation fund for their trip to Disneyland on the concert. It is revealed that this is at least the 4th attempt to reunite Zazz Blammymatazz.
After an accident at a show in Mozambique that seemed to be caused by Pickle's drinking and cost millions of dollars in damage, Pickles is forced to go to rehabilitation. While in rehab, the band replaces Pickles at practice with a high tech, sentient drum machine named X2P1158 which is inexplicably armed with a 10,000 megaton self detonation device.
Toki and Murderface are put on probation after their frivolous lawsuit against the other band members regarding residuals is dismissed and their contribution to the band is called into question. While on probation, Toki and Murderface act as celebrity guest judges on "American Super Talent Havers" to make some extra money. On the show, they judge a nu metal band known as Get Thee Hence and like the group so much that they decide to start their own record label called MurderTooth Records and sign Get Thee Hence as their first and only band.
After playing in Tokyo, Dethklok kidnaps Toki for his birthday party. The band supplies him with many women to have sex with, but Toki declines and instead begins the search for a soul mate. Using a dating service his search goes horribly wrong, and in the end he has sex with all the woman the rest of the band gave him on his birthday. Meanwhile, Murderface, fed up with his sexual performance, bets Skwisgaar that he can have more sex than him.