Bakugan Esp 1 : Bakugan: The Battle Begins Part 1.

The Bakugan, Dragonoid, who will soon become Dan's closest ally, begins to explain the origin of Bakugan's & the Dimension of Vestroia. His quest is to find Naga, who holds the key to power in the two parallel universes, Earth & Vestroia. Drago must eliminate Naga if he hopes to restore order. But Naga has absorbed incredible amounts of energy and may be too powerful to defeat!