Dethklok is notified of a looming secret that has been around for hundreds of years: the secret of the Metalocalypse. Before they can contemplate what this means, however, Nathan must give a eulogy and do the most brutal thing he has ever done: get in touch with his emotions.

The guys spend time on a sub without women, and the conditions quickly deteriorate, prompting Pickles and Nathan to compete for the affections of their producer.

Toki writes a tell-all book about Skwisgaar and becomes lead guitarist for the band, but the pressure may be more than he can handle. Elsewhere, Nathan buys a defibrillator as a toy.

Murderface goes to Mexico for plastic surgery after he receives a dubious award. The rest of the guys, meanwhile, deal with the effects of aging and years of hard living.

Dethklok opens a Dethfair in Tomahawk, Wisconsin; Pickles goes into realty.

As Dethklok hosts the most important dinner of their career, the divvying of album credits, over tagging on social networking sites, and fights over a girl come to head. Can CFO keep their issues in check? Will the record executives forgive them for the past year of mistakes? Or will it be a total, brutal disaster?

The guys pull pranks and go on vacation to celebrate the release of their album, but Nathan senses that something is not right with their latest release. Meanwhile, Skwisgaar and Toki plot revenge on Murderface for his pranks.

The band’s new female producer sends them on a vacation to help write songs for the new album. The getaway proves anything but relaxing, however, when they end up in a brutal country and are sold into sex slavery.

Nathan begins dating a hardcore Dethklok fan, against the advice of his bandmates. The rest of Dethklok takes up smoking.

Accusations of racism are leveled at the band, so they open an urban youth center to improve their image. Elsewhere, Toki starts a club but excludes Murderface.

Toki goes to rock-and-roll camp and is bullied by other campers. But he soon finds an ally in a former Dethklok guitarist. Meanwhile, Skwisgaar and Murderface binge on candy and horror movies while Toki is away.

While the world awaits the final Dethklok performance, members of the band prepare for their post-Dethklok careers. Pickles starts a winery for the most alcoholic wine ever, Nathan and Skwisgaar look for a brand new sound that does not suck, and Toki works with Murderface on his campaign for congressman. Meanwhile, Selatcia takes Dethklok’s weakness as the opportune time to strike!