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'''Series 1''' is the first worldwide Spin Master's release of [[LegacyGeneration 1]] Bakugan, as well as Bakugan in general. It introduced many items that became staples of the franchise, such as [[Booster Pack (Toy product)|Booster Packs]], [[Starter Pack#Battle Brawlers|Starter Packs]], and [[Battle Pack (Generation 1)|Battle Packs]]. Every Bakugan released during this series was a [[Bakugan Size#B1|28mm Bakugan]].