While the battle for Decepticon leadership was being waged, every Autobot held their breath (so to speak). Not because of Shockwave's attempts to destroy Megatron though - no, it's because a very long, very delicate, and monumentally important operation has been underway in the medical bay of their crippled spacecraft, The Ark. the Transformer doing the operating is Ratchet, their chief medical officer, and the patient is none other than their leader - Optimus Prime. Can Ratchet really hope to achieve the impossible and bring life to Prime's shattered remains? He's the Autobots last hope, and no-one knows this more keenly than Ratchet himself!
Plus the debut of the Autobots' latest and deadliest human enemy yet - The Mechanic!