While Kazarina works on a secret weapon designed to take down the restored Second Shield, the Gundalians dispatch their army of hypnotized Earth kids to distract the Brawlers in battle. Dan and Fabia find themselves facing off against a familiar face: Koji - the first battler Fabia faced in Bakugan Interspace. They quickly find themselves outmatched, as Koji is using a Bakugan Mobile Assault Vehicle in battle, which is immune to normal ability attacks. Luckily for Dan, Fabia has a monster machine of her own that she is about to introduce Drago to.