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In the early months of 2011, the Bakugan series was at the end in the third season, Bakugan: Gundalian Invaders. Had been already rumors about a fourth season even in the past year but it was all just rumor for about a while. until February emerged. The last of the Gundalian Invaders wave of Bakugan were out, and Spinmaster did start to unravel the actual season among the series, Bakugan: Mechtani