Bakugan the Battle Begins

S1 E1: The Bakugan, Drago, who will soon become Dan's closest ally, begins to explain the origin of Bakugan and the Dimension of Vestroia. His quest is to find Naga who holds the key to power in the two parallel universes, Earth and 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!