Cybertron is a floating hunk of scrap. Centuries of war have devastated the planet and sent millions of Autobots and Decepticons soliders to the junkyard. The evil Megatron and his Decepticons use the shell of a planet to plot their assaults against the Autobots. Their latest weapon? Dark Energon! Megatron surges with its unbridled, vicious power, ready to conquer the universe. But Optimus Prime and his Autobots will not go down without a fight - they're fueled by the same righteous and pure Energon that powered the golden age of Cybertron.