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.

While Dethklok's manager, Charles Offdensen, is absent cleaning up hundreds of problems caused by the band, Dethklok double books a gig--between Syria and Israel on the same day.

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?

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!

Dethklok travels to the Amazon where they learn about native brutality from the Yannemango Indians.

After Dethklok is accused of being racist at a huge press conference, they combat the charges by opening an Urban Youth Dethcenter. Meanwhile, Toki, after being left behind, starts a special club that promotes equality and love but excludes Murderface because he doesn't have the right look.

After a near-death experience, Dethklok realizes they would rather be sick and not know then face the brutality of going to a doctor. After home remedies including drinking bleach, Dethklok learns that their ultimate fear will be realized, one of them has a terminal illness. Meanwhile Nathan tries to brave the brutality of going to the dentist and Murderface faces the possibility of being gay after accidentally ejaculating on a doctors face.

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.

In an effort to make friends, Toki goes to Rockaroonie Fantasy Camp - a weekend getaway to rub elbows with rock and roll royalty (but he attends as a camper.) Instead of meeting friends, he is bullied by other campers and has no one to turn to but celebrity counselor, Magnus Hammersmith; ex-Dethklok guitarist with a troubled past. With Toki - the diabetic scaredy cat - out of Mordhaus, Skwisgaar and Murderface act out and over do it with candy and scary movies.

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.

The wounded, the scarred, and the disfigured unite. Meanwhile, an oblivious Dethklok spends their studio time recording onto the purest of all analog formats: water.

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.

After Murderface is announced as the recipient of this year's Most Brutal Looking Musician Award, he travels to Mexico to get the best and cheapest plastic surgery possible. Meanwhile, the rest of Dethklok deal with the brutality of aging and letting themselves go.

Since Dethklok's withdrawal from the public following the purported Dethwater Live "fan attack", the world economy teeters on the brink of disaster. Dethklok is finally lured back into the outside world with their protective "pelvic-thrust mace belts" to be a part of the world's largest public execution of criminals in recorded history.

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

Dethklok returns to the water to record in their new Dethsub but, plagued with the lack of women, carpel tunnel sets in from excessive masturbation. The band regresses to an animal mindset. Pickles and Nathan spend their energy crossing the workplace relationship line and competing for the only woman on the sub: their producer.

Toki falls head over heals for a girl he meets online. When things sour he tries to break it off and instead has to bear the brutality of being her date at her father's vegan funeral in 110 degree heat. Meanwhile Nathan experiences the brutality of dating a performance artist. And Murderface must attend a sexual harassment seminar after trying to match Skwisgaar's sexual prowess.

Dethklok must experience the ultimate brutality of the Holiday season; spending time with their MOTHERS. Meanwhile Murderface ringleads the ultimate Christmas special that ends up being backed by the Christian church. And a particular ROCK AND ROLL clown makes a holiday appearance.

Dethklok joins their own Dethklok tribute band as a last ditch effort to connect with their rock and roll roots.

Dethklok decides to try their hand at standup comedy in order to avoid burning out on metal. Pickles remains traumatized by a heckler while the rest of the band learns that comedy is all about embracing the hate.

Pickles' popularity soars when he gets a personal P.R. agent, prompting the rest of Dethklok to form a rival P.R. firm. Meanwhile, Pickles' P.R. woman has dark, otherworldy, and religious motives behind her Evil Press Releases.

With their new album finally shipping, Dethklok plans their post-release traditions of vacationing, goofing off, palling around, and prank calls. Nathan, however, can't shake the feeling that something is wrong with the record... After being humiliated by Murderface's prank calls, Skwisgaar and Toki swear revenge.

Toki Wartooth is fed up playing in the shadow of Skwisgaar's lead guitar. Under the tutelage of a crusty old guitar master, Toki learns that the heart, too, has strings.

The world economy is crumbling and waiting for the next Dethklok album to stimulate it back into order. It’s up to Dethklok to get the album just right and finished on time.

Upon learning that they've once again earned too much money over the past year, the band tries to "donate" as much as they can to charity as a tax write-off. The guys also unwisely attempt fatherhood and play a landmark concert with the London Philharmonic Orchestra which ends with a killer laser light show.

The band is given a movie development deal.

Dethklok heads to Tomahawk, Wisconsin to open a Dethfair in hopes that it will stimulate the economy they destroyed. Pickles uses this time at home to reconnect with his disapproving mother who tells him that she won't respect him until he gets a real job. Pickles decides to hang up his drumsticks and goes into an even more brutal profession: he becomes a realtor.

Dethklok hires the world's only six-star chef to cook dinner for them before a show in Norway. They warn him of the Dethklok curse, where every employee they've hired, chefs included, has tragically died. Later, when their new chef is at near-death on life support following an unfortunate helicoptor mishap, the band is forced to make its own meals.

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.

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.

The band is fed up with Ofdenson knowing more than they do. They want their fifth of everything and decide to hire an efficiency expert to tighten up matters at Mordhaus and maximize their weekly allowance.

Murderface wants the easy life but still wants all the rewards. After the band decides to kick him out for making their jobs more difficult, Murderface realizes the EASIEST way to make BIG money is to start his own label.

William Murderface creates the "Nascar-type Theatrical Hybrid Event" and takes all creative and logistical control upon himself. Nathan and Pickles try to be supportive of their overwhelmed pal, while Skwisgaar and Toki attempt to get their driver licenses.

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

When promoting a new clothing line, Dethklok experiences the brutality of negative body image, dieting, and bulimia.

Murderface searches for a religion after a near-death experience leaves him longing for greater meaning. He samples everything from Christianity to Satanism before finding his true calling.

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.

When Pickles discovers through an episode of Where are They Now Now? that Snakes N' Barrels has reunited without him for the "SOBERTOWN USA No Drugs Allowed Sober Rock and Roll Show", he and the rest of Dethklok travel to Los Angeles to put an end to the atrocity.