《爆丸4 机械波涛》讲述的是：Drago is unable to control the powers he has received from Code Eve, so Dan and Drago contemplate retirement. Meanwhile a new and insidious enemy infiltrates Bakugan Interspace shaking the Battle Brawlers and their fans. The Battle Brawlers must find a way to control Code Eve's powers, with the help of some new allies, or else this new threat could threaten all Bakugan everywhere.