Metalocalypse: Army of the Doomstar

After rescuing Toki from the Revengeancers and defeating the Metal Masked Assassin, Dethklok hold a press conference to announce a new tour and music. While the rest of the band have no recollection of the actual rescue, Nathan is suffering from post-traumatic stress from the experience and Magnus Hammersmith's suicide, while Toki has emotionally regressed to a child-like state as a coping mechanism. This results in him passing out during their first performance back together and all plans being indefinitely paused while he recovers at Mordhaus. During a memorial service for Ishnifus Meaddle, Charles Offdensen (now leader of the Church of the Black Klok) tasks Nathan with writing the "Song of Salvation" to prevent the Doomstar from destroying the Earth and allowing Mr Salacia to become whole again, but Nathan declines, choosing to settle down with Abigail. However, Abigail declines his proposal. After a confrontation with fans who witnessed it, Nathan ultimately decides to focus on his music, and the band head to a secret location under the guidance of Dick Knubbler.

Meanwhile, General Crozier has been temporarily freed from control by Mr Salacia while he attempts to possess another, as he can only possess one person at a time. Now aware of what the Tribunal's true motives are, Crozier attempts to get a message out, but is stopped by Vater Orlaag before Salacia regains control. It turns out that the other person Salacia is attempting to possess is William Murderface, who experiences disturbing and painful hallucinations as Salacia takes control and influences him to damage Nathan's confidence and prevent the Song of Salvation from being written, as well as revealing the location of the Army of the Doomstar.

At the end of their training and a drug induced meeting between Nathan and the Whale Prophet, the band begin performing the Song of Salvation. However, as they begin, Nathan realises that this is the wrong song. During their performance of "Aortic Desecration", the Doomstar approaches Earth and begins the Metalocalypse, destroying monuments across the planet and killing millions. The US Army and the Tribunal's own militia then attack the band's location, wiping out the Army of the Doomstar and killing Knubbler. During the attack, Crozier is able to free himself of Salacia's control for good while Muderface flees, still possessed and blaming himself for sabotaging the band's attempt to save the world. Crozier offers his help to the band as Skwisgaar, still in shock from the attack, is able to reveal Murderface's possession to the others. Crozier tells the band how to free him from Salacia and the band forgive him for what happened, given that he was not in control of his actions, explaining that he belongs in the band as he brings balance to the group with his negativity.

Realising what they now need to do, Dethklok and Crozier reconvene with Edgar Jomfru to perform the correct Song of Salvation, "SOS", but during their performance, Vater Orlaag orders an attack on the group. Dethklok are captured by Salacia and, after Nathan refuses Salacia's offer to join him, the five are hooked up to the supercomputer Salacia built to draw in the Doomstar. This allows Salacia to draw on the power of the Doomstar and commence the "Great Reuniting", becoming whole once more, but Nathan is able to break free of his restraints and break the computer long enough for the rest of the band to break free. Jomfru and Crozier infiltrate the facility, with Jomfru planting a bomb to destroy the supercomputer while Crozier attempts to regain control of the US military. Jomfru is killed, but not before successfully activating the bomb. The band are joined by Offdensen, the Church of the Black Klok, and their legions of fans, and fight the Tribunal's forces and the US Army while Vater Orlaag fights Offdensen. Just as Orlaag is about to kill Offdensen, he is distracted by Murderface, allowing Offdensen to recover and kill Orlaag. Crozier manages to regain control of the US military and orders them to stand down and assist the fans, apprehending the Tribunal's forces.

However, Salacia emerges from his coccoon in his true form, killing many of the people on the battlefield. As he attempts to kill Dethklok, Nathan draws on the power of the Doomstar himself to counter Salacia's attacks. The band's power spreads to the legions of fans, amplifying their power and forcing Salacia to "Go into the Water", where he is finally killed by the Whale Prophet. Addressing their fans in the aftermath, Nathan realises that the fans are the true Army of the Doomstar, and that their new relationship with their fans is the true "Great Reuniting". The group and fans celebrate as the movie ends.

• Brendon Small as Nathan Explosion, Skwisgaar Skwigelf, Pickles, Charles Offdensen, Edgar Jomfru, Dick Knubbler
• Tommy Blacha as Toki Wartooth, William Murderface, Dr. Rockzo
• Malcolm McDowell as Vater Orlaag
• Raya Yarbrough as Abigail Remeltindrinc
• Mark Hamill as Mr. Salacia, Senator Stampingston, Oscar Explosion, Fan
• Victor Brandt as General Crozier
• Thundercat as Fan
• King Diamond as Priest
• Jon Hamm as Emcee, Fan
• Scott Ian as Elite Tribunal Soldier, Fan
• Amy Lee as Fan
• Juliet Mills as Whale
• Laraine Newman as Rose Explosion, Newscaster
• Livia Zita as Tribunal member

The original motion picture soundtrack for the film was released on August 25, 2023 through WaterTower Music.[4]

A review on The Daily Beast says of the film: "It may be the weirdest and wildest music series of all-time, yet at its fire-and-brimstone core, Small and Blacha’s Metalocalypse saga is a sincere ode to the thrilling extremism of metal and a celebration of the idea that music is life—and, when loud and ferocious enough, capable of saving the world."[5]

A review at Blu-Ray.com states "So yes, it's a page ripped directly out of the Bill and Ted's Excellent Adventure playbook -- or, to a much lesser extent, Bill and Ted Face the Music -- albeit with a much more darkly funny and violent edge. That's about as big a complaint as I can muster for what's otherwise a well-crafted and even emotionally effective love letter to die-hard fans who've patiently waited a full decade for the band to get back together. "[6] The film was additionally reviewed in Polygon[7] and IGN.[8]

• Metalocalypse: Army of the Doomstar at IMDb