The uneasy peace is shattered after the return of Megatron! Yet the Autobots, aided by new allies Rodimus and Omega Supreme, fight back in a battle on multiple fronts across the galaxy. The search for Unicron by leads to the discovery of a new energy source, Super Energon. When Megatron uses this power to become the terrifying force, Galvatron, he becomes an even more dangerous threat. Can Optimus Prime muster enough power to defeat Galvatron, or even worse, the power of Unicron?