One day mysterious cards fall from the sky and are picked up by hundreds of kids. The kids then develop a game know as Bakugan. However, there is more to the game then they thought. The Bakugan come from another world known as Vestroia, where the evil Naga is trying to conquer the world by finding the Infinity Core. Now the kids and Bakugan must team up to stop this threat.
Bakugan Battle Brawlers premiered in the U.S. on Cartoon Network on Sunday, February 24, 2008 after the premiere of the tenth Pokémon Movie- Pokémon: The Rise of Darkrai. The series then moved to its primary timeslot of Saturday mornings at 11:00am (ET) on March 8, 2008. The first season ended on February 28, 2009.
The second season, Bakugan Battle Brawlers: New Vestroia premiered on May 9, 2009 at 11:00am (ET). On September 5, 2009, the series began airing new episodes at its new timeslot of Saturday mornings at 8:00am (ET). On November 7, 2009, the series moved to 7:00pm (ET) as part of Cartoon Network's new "You Are Here" Action-Adventure Saturday night block.