This season of Bakugan was the first focusing on a team called the Bakugan Battle Brawlers. In the team were
Dan Kuso - Pyrus Brawler
Julie Makimoto- Subterra Brawler
Runo Mizaki - Haos Brawler
Alice Gehabich - Darkus Brawler
Choji Marukura "Marucho" - Aquos Brawler
and Shun Kazami - Ventus Brawler
the first part of this season is about a mysterious man named Masquerade. He brawls people and activates a weird card called "the Doom Card" it sends the losing bakugan to the Doom Dimension to suffer.
The second part of the season focused on stopping Naga from getting to Earth so they can stop the destruction of the two worlds.