Dethklok receives death threats from fans right before the first live performance of Dethwater. Krosier and Ravenwood attempt to take Dethklok out, with the help of an old enemies brother... With the secret army on the horizon waiting for the right moment to strike, will Dethklok make it through this?

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 band plays an ancient song which hasn't been heard in thousands of years which unexpectedly awakens a deadly Nordic lake troll and must compose the world's first death metal lullaby to return the beast to its slumber.

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!

Pickles decides to go on a reunion tour with his old band, Snakes 'n' Barrels. The government plots to use a new super-drug to erase Pickles' mind and 'reprogram' him, thereby destroying Dethklok from within.

After a concert that Dethklok didn't perform, but just stood on the stage, they travel to Mississippi to learn about the blues.

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.

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.

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.

Uncomfortable and embarrassed, Dethklok painfully endures while their parents are in town for a visit. They are at first pissed and doubtful when their parents announce the release of the 'Parents of Dethklok' album, but soon realize the depth of their parents' anger. The guys learn an important lesson: there's nothing more brutal in this world than raising children.

Dethklok has a huge fight on stage, which prompts the record label to hire a performance coach to keep the band together. The band falls in love with therapy for all the wrong reasons.

Mordhouse, the home of Dethklok, opens its gates to the public for the first time in celebration of International Dethfan Day. Will the band and their fans make it through the experience? Dethklok find themselves in potential trouble after two Internet geeks threaten to release the band's exclusive, one-time-only, fan song over the internet unless they give in to their demands.

Skwisgaar hosts the "Skwisgaar Skwigelf Advanced Hand Finger Wizard Master Class" pay-per-view event to promote sales of his new guitar line, which includes models such as the Skwisarmyatar and the Antfarmatar. The rest of the guys get inspired to also try their hand at endorsement deals. Metal legend King Diamond guest stars as Ronald Von Monoldburg.

Dethklok has an end of the quarter employee evaluation to find out who has been embezzling from the company. The patronizing evaluation start off with a pep talk and a corporate video that will have audiences and Dethfans alike vying for a spot on the Dethklok payroll.

Dethklok is asked to host the American Pornography Awards, but Nathan's new controlling girlfriend puts a damper on the situation for the entire band.

The band is given a movie development deal.

When Toki gets news that his dad is dying, he's forced to travel back to his home town in Norway. The rest of the band decides to make a vacation out of it, citing "album inspiration" as their excuse to further put off working on their delayed album.

Dethklok’s new album is released to the world. The Revengencers make their next move. Mordhouse is directly attacked by the Revengencers, during a concert after party. Part two.

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

It's Murderface's birthday, and the rest of the band soon are faced with the difficult task of getting him a present. In fact, he actually ends up hating his party until they finally give him their gift.

Continually plagued by his stupidity, Nathan Explosion decides to attempt to earn his GED.

Toki tries to compensate for his adorable charm by over-brutalizing his intentions and actions.

Dr. Rockso and Toki's sudden friendship has the rest of Dethklok uneasy.

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.

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