Bakugan: Defenders of the Core is a video game for the Nintendo Wii that expands upon the Bakugan universe. Set in an alternate Earth where the Vexos have conquered the Resistance, players assume the role of a character immune to a powerful Vexos attack. Tasked with aiding the Resistance, players engage in strategic brawls to reclaim Earth and seek a path back home.
The game follows a story arc from Bakugan Battle Brawlers: New Vestroia not followed in the Anime. When Bakugan Interspace has a malfunction, the player is sent to an alternate Earth. In this Earth, the Resistance lost to the Vexos. After that the Vexos took over Earth. The Resistance has been fighting the Vexos and they got hit with a beam used by the Vexos' newest creation, the Vexos Crystal, which breaks the Resistance's Gauntlets and leaves them unable to brawl. Due to the player not being affected by the beams, he decides to help the Resistance defeat the Vexos and also tries to find a way home. This is also your game character.