The Battle Brawlers — Tracey West

Bakugan Battle Brawlers . . . ready to save this world . . . and the next!

One day, strange cards began to fall from the sky. All over the world, kids picked them up and created a battle game. The best players were Dan, Marucho, Runo, Shun, Julie and Alice. They called the monsters on the cards "Bakugans" and their team the "Bakugan Battle Brawlers".
But these aren't just cards. And it's more than a game. The cards correspond to a world called Vestroia where a fierce battle is raging-a battle that could destroy both Vestoria and the human world. ((continued))