Metalocalypse: Army of the Doomstar

Dethklok's Nathan Explosion is tasked with writing the "Song of Salvation" to save the planet from impending doom, but his post-traumatic stress and declining marriage proposal forces him to focus on music. As he composes a song that isn't the correct one, the Doomstar begins its destructive path, destroying monuments across the planet and killing millions. With their lives at stake, Dethklok performs the correct Song of Salvation, freeing themselves from Salacia's control and joining forces with fans, General Crozier, and Edgar Jomfru to defeat the ultimate evil: Salacia.