Danma Kuusou and his companions settle back into life on Earth after returning from the tumultuous realms of Gundalia and Neathia. After a year, Bakugan Interspace, the virtual reality playground for brawlers, finally recuperates from an alien invasion and welcomes back challengers. However, Danma's Pyrus Dragonoid's mighty power fuels new struggles for Interspace. Despite the incredible abilities he inherited from Code Eve, the Bakugan Mother spirit, Danma struggles to control the Mechtogan stored inside him. When it runs amok, the rogue Mechtogan endangers the safety of allies and foes alike. To compound the problem, Bakugan Interspace faces renewed infiltration. An enigmatic force introduces mutated Chaos Bakugan into the system to brainwash brawlers and seize control of the virtual realm. Danma must prevent the Mechtogan's havoc while rallying the Battle Brawlers to prepare for the looming showdown.