Dan Kuso's life changes one day when cards start falling from out of the sky and he grabs one, which he and his friend Shun use to invent a game they call "Bakugan. " With other friends, they form a group called the "Bakugan Battle Brawlers." They then are accidentally dragged into fighting for the fate of Vestroia (the home dimension of Bakugans). Vestroia loses its natural balance and merges with the Earth and many other worlds. A rogue Bakugan called "Naga" has been tempted to capture the power of the Infinity Core and the Silent Cores, which together formed the perfect core that balanced Vestroia, but Naga has absorbed too much negative energy and thus been trapped within the Silent Core, destabilizing Vestroia. Naga now seeks the mighty Infinity Core so that he can the all-powerful Perfect Core and have almighty power and absolute control over Earth and Vestroia.
