In 2010 Tranformers: Armada follows the latest battle in the war between the Autobots and Decepticons as the two sides race to gain the allegiance of a newly discovered race of Transformers known as Mini-Cons. Much smaller than either the regular Transformers, the Mini-Cons can connect to their large counterparts granting them new abilities. Each Mini-Con enhances the power of a Transformer exponentially. Our only chance for a peaceful cosmos is for Optimus Prime and the Autobots to defeat their enemies and free all Mini-Cons.
ユニクロン決戦から10年、地球ではサイバトロン、デストロン、マイクロン、人間が共存していた。しかし、未知のエネルギー・エネルゴンを狙ったテラーコン軍団の襲撃により平和は崩れさる。メガトロン復活を条件にテラーコンに寝返るデストロン。地球、宇宙、セイバートロン星と舞台を変え、エネルゴンを巡った三つ巴の争奪戦は激化していく。
A black hole threatens Cybertron, so evacuation begins. Autobots and Decepticons end up on the present day Earth and battle again.