A bounty hunter from the underworld, a demonic goddess, a cursed mythical kingdom rising from the depths of below, and a mouthy twelve-year-old are no match for Danger Devil and her sidekick Kid Diabla. These masked agents from the Mystic Bureau are dedicated to protecting the world from all supernatural threats, especially the Order of Methalia, an ancient society hellbent on returning the wicked one to her throne as the ruler of the ancient civilization of Tragg Magnar.

Danger Devil and Kid Diabla return to the Mystic Bureau's headquarters only to discover that there's no rest for the weary when it comes to protecting the world from the Order of Methalia. Beatty Maxwell assists Xenia Urbana with her new life while Methalia unleashes a new bounty hunter to punish the Mystic Bureau. Danger Devil learns that an old flame is helping the Mystic Bureau on their mission.