In Bakugan Battle Brawlers, Danma Kuusou and his friend Shun Kazami create the Bakugan game using mysterious cards that fell from the sky. Their fun pastime turns serious when they are transported to Vestroia, the world of Bakugan, under siege by the Doom Beings. To restore balance and prevent disaster, they must join forces with allies from different dimensions to stop the malevolent Bakugan Naga from seizing the Infinity Core. Racing against time, they engage in a high-stakes battle to save Vestroia, Earth, and countless other realms from impending doom.