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.

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.

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.

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

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.

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?