"As the Cybertronian Civil War rages between optimus Prime's Autobots and Megatron's Decepticons, Shockwave has encountered a new obstacle to the Decepticons' victory and subjucation of the planet: Megatron himself! As Optimus and his recruits take off to stop an even deadlier threat -- an asteroid belt powerful enough to destroy the metal world -- Megatron leads a team of Decepticons after in hot pursuit! But what other motivations does Prime have for this mission? How does it benefit Shockwave's goals? And what does it all have to do with a sercet on Earth in the eleventh century?" -- Back cover.