A surge of dimensional energy known as the Astral Echo shatters the barriers between Earth and Hell, hurling the elite fighters of Killer Instinct into the chaotic underworld of Helluva Boss. What begins as a freak accident quickly escalates into an all-out brawl, where martial arts, blades, and raw power collide against the cunning and deadly inhabitants of Hell.
The heroes—Jago, Orchid, T.J. Combo, Maya, Thunder, Eagle, Sabrewulf, Rash, and Kim Wu—must battle Blitzo, Moxxie, Millie, Loona, and other Helluva Boss villains, each armed with twisted powers, sharp wits, and infernal weapons. From Jago’s disciplined Shaolin strikes to Kim Wu’s lightning-fast dragon-style attacks, the Earth warriors are pushed to their limits to survive the chaos.
As Gargos manipulates the Astral Echo to merge the two realms under his dominion, every fight becomes a test of skill, strategy, and willpower. The Killer Instinct heroes must overcome Hell’s fiends and their unpredictable powers, combining precision, teamwork, and relentless determination to stop the merging of worlds—and prevent the underworld from spilling into Earth.
