‘Bakugan Battle Brawlers’
One day, cards began to fall from the sky and were picked up by kids all over the world. The cards featured different characters, different environments, and different powers. Kids created a popular battle game not knowing that these cards actually corresponded to an alternate world called Vestroia. Kids from all over the world played with the cards, yet 6 kids stood out: Dan, Marucho, Runo, Shun, Julie and Alice. They named the monsters “Bakugans” and their elite team the “Bakugan Battle Brawlers”.
Descriptions taken from AniDB.net