The Chaos Dan Kuso makes his debut appearance in Bakugan: Battle Dimensions as the only human antagonist in the series's first arc. The Chaos that remained in the Dark Reverse Dimension after Code Eve sealed the gate to Valhalla during her failed attempt to send Emperor Barodius and Phantom Dharak to the afterlife, it has since assumed the form of the missing Dan Kuso to maintain balance between the visible and invisible worlds. It now serves Destroy Munikis, and it seeks to eliminate the Battle Brawlers so that none can stand in the way of its master's rebirth, even tricking them into thinking it is the real Dan for a short time. Able to control Chaos at will, it is partnered with Chaos replicas of the Original Dragonoid and Dharaknoid.