This season featured several musicians as voice actors, such as Kirk Hammett and James Hetfield of Metallica, Michael Amott of Arch Enemy; Steve Smyth, Warrel Dane and Jeff Loomis of Nevermore; George "Corpsegrinder" Fisher of Cannibal Corpse and King Diamond of the eponymous band.

Following his death, the band struggles to come up with a solution to eating, and after a failed shopping attempt they solve the problem by sewing the chef back together, with limited success: some parts do not quite fit or are backwards.

Guest voices: James Hetfield and Kirk Hammett of Metallica, Laraine Newman The band records an album in the Mariana Trench in a nuclear submarine.

The band decides to put the troll back to sleep solely so they can once again use e-mail and their DSL-equipped Dethphones, albeit by playing antique acoustic instruments shown to them by an old Finn at a bar.

Murderface promptly loses reception and throws his barbed and bladed Dethphone down the Mustakrakish's throat, whereupon the troll gruesomely eviscerates itself in a desperate and frantic attempt to get it out.

Although they achieve success after some tutelage and learning to "embrace the hate" taught by a crusty old sailor (voiced by Metallica's James Hetfield), Pickles remains severely traumatized the memory of a heckler.

Guest voice: James Hetfield of Metallica A journalist reunites the members of Dethklok with their families, driving the band insane as they must deal with their greedy, annoying, and aggressive relatives.

Finally, the parents and siblings decide to make a Dethklok family album, asserting that "there is nothing in this world more brutal and grotesque than raising children."

The therapist, an ex-musician named John Twinkletits who ultimately killed his bandmates, encourages Dethklok to open up by rewarding them with shiny banana stickers.

The Tribunal plots to permanently erase Pickles' mind with a new superdrug they have created: Totally Awesome Sweet Alabama Liquid Snake.

However, due to his overwhelming popularity, he is determined to "reinvent the instrument" and fans mimic his moves by stroking the guitar with stiff fingers.

Guest voices: George "Corpsegrinder" Fisher of Cannibal Corpse and King Diamond of the eponymous band After falling into a deep depression, Dethklok travels to Mississippi to learn about the blues.

Guest voices: George "Corpsegrinder" Fisher of Cannibal Corpse and King Diamond of the eponymous band Toki tries to compensate for his adorable charm by becoming overly brutal.

After walking out of their own premiere, Dethklok tries to convince the producer to shut down the movie, but he replies that because he wants a return on his investment, that he will push forward with the "500-million-dollar shit sandwich, and you are all going to take a bite."

As Dethklok leaves in their helicopter, it accidentally damages the oil platform the premiere was on, starting a fire which incinerates the audience, producer and all copies of the film.

Since the producer had previously written all the reviews for the film before it was even finished, Business News Weekly's front page reads, "World's Greatest Movie Destroyed!"

Guest voices: Andy Richter and Laura Silverman As Dethklok prepares to play their new album for the very first time live, General Crozier and Cardinal Ravenwood break rank with the rest of the Tribunal and lead a full-scale assault on the band, and they hire an assassin (voiced by Cannibal Corpse's Corpsegrinder), whose brother was killed by Dethklok in episode "Murdering Outside the Box."

The band approaches the dying Cardinal who utters the final words, "The Metalocalypse has begun..." Guest voice: George "Corpsegrinder" Fisher of Cannibal Corpse Songs included: "Go Into the Water"