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{{nihongo|'''Bakugan'''|爆丸|Bakugan}} are creatures from an alternate dimension called [[Vestroia]], along with the worlds of [[Neathia]] and [[Gundalia]]. It is also a [[Bakugan (game)|game]] that uses these Bakugan. The kanji for "Bakugan" reads "exploding sphere".

Bakugan take many sizes and shapes, and generally comes in six [[Attributes]], [[Pyrus#Generation 1|Pyrus]], [[Haos#Legacy|Haos]], [[Subterra]], [[Darkus#Legacy|Darkus]], [[Ventus#Legacy|Ventus]], and [[Aquos#Legacy|Aquos]]. Additionally, [[Naga]] and [[Wavern]] in the anime are referred to as "[[The White Ones]]". See [[Attribute]].

Naga is the evil Bakugan who opened up the Vortex from Vestroia to Earth. At the end of season 1, the six attribute worlds of Vestroia were merged into [[New Vestroia]], with a noble [[Dragonoid (Generation 1)|Dragonoid]] as its new core.

Three years after New Vestroia formed, it was discovered that the [[Vestals]] had colonized the planet, and subjugated the Bakugan. [[Drago (Dan Kuso)|Drago]] separated himself from the core, and with help from five new heroes, managed to save Vestroia from the Vestal colonists, and later the [[Bakugan Termination System]]; a device made to destroy Bakugan. Around this time artificial Bakugan were developed; [[Mechanical Bakugan]] by the Vestals, and [[Synthetic Bakugan]] by humans using [[Phantom Data]].