Dan and Drago have passed into another world as they make their way toward Naga. But once again, they're up against a couple of fierce Bakugan Gatekeepers who won't let the Brawlers pass without a fight. But just as Dan and Drago get nailed, the oldest and wisest Bakugan, Nobilion, shows up to protect them. He explains how Naga came to being and how the Bakugan and the human dimensions overlapped, causing the chaos that's all around them. Nobilion tells Dan and Drago to follow him and he'll lead them to Naga himself. But just as their journey begins, Centorrior and Druman, two nasty Bakugan in this dimension, show up and block their path! Without breaking a sweat, they push back Drago and destroy Nobilion! Now the injured heroes are all alone and on the verge of failure.