Some months after Mechtanium Surge, Dan returns from New Vestroia to Bakugan City after a special training, he rejoins to the Brawlers, when some kids appear using Chaos Bakugan and causing troubles, after chalenging them to a battle and starting with advantage until they start to use forbidden cards, Dan reveals that exists two types of Chaos Bakugan like used to be two cores in Vestroia, the negative energy type like Mag Mel controled, but it also exists the positive energy type, and the same thing is applied to the forbidden ability, that is actually the bakugan secret powers, when Drago turns from Fusion Dragonoid to Chaos Fusion Dragoid and uses the Secret Ability: Eternal Flame, Shining Blaze, he wins the battle, but in the Doom dimension Naga and Razenoid are reaveled to have been