The fates of Cybertron and Earth lie in the balance as Optimus Prime and his Autobots battle Megatron and his Decepticons in a fight to the finish for the AllSpark.
The Decepticons kidnap Bulkhead to aid in Megatron’s ultimate plan to take over Cybertron.
Left alone in the Autobots’ home base, Sari must defend it against an intrusion by the Constructicons.
Blackarachnia enlists Prometheus Black, a.k.a. Meltdown, to aid her with a dangerous experiment, while Optimus and Dinobot Grimlock are forced to team up to stop them.
On the trail of an escaped Autobot traitor, Bumblebee flashes back to a previous encounter with the traitor when he first met Bulkhead in Autobot Boot Camp.
