Bakugan Interspace has gone active all across the Earth, and kids are having fun testing their skills against Dan, Shun, and Marucho. However the Brawlers soon learn some Bakugan were sent into an alternate dimension when Vestroia became six different groups. These Bakugan are now at war with each other as the Gunadlians and the Neathians fighting for control of their dimension and looking to recruit the strongest Earthlings to their cause. The Battle Brawlers must noe fight to keep Interspace free of politics while deciding whether or not they should participate in this new found war.

Source: ANN

Note: This series aired first on the Canadian Teletoon channel, with the US counterpart being about 6 days behind. Episodes 18 to 20 were chop-jobbed into a single episode in the US broadcast, resulting in the US broadcast being one day ahead from episode 21 onwards.

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Prequel: Bakugan Battle Brawlers: New Vestroia
Sequel: Bakugan: Mechtanium Surge