The benevolent Maximals(led by Optimus Primal) and the evil Predacons(led by Megatron) continue to wage a massive battle for the gleaming, Energon-rich planet Cybertron. The Predacons now have unbeatable new weaponry at their disposal, including a viral mine that robs Optimus Primal of his personality and renders him helpless. But now Megatron faces a new enemy –Terrorsaur. When a fight breaks out, the Predacon base is destroyed. Victory appears to be at hand for the Maximals. Or is it?