Dirt Boss comes online and forces the Constructicons & Bulkhead to work for him; Lugnut shows up and the rest of the Autobots have a big problem.
In the aftermath of the battle at the mine, Sari and her father’s relationship takes a strange turn; the Autobots have their work cut out for them trying to contact Cybertron; and Megatron and Starscream find a new opportunity.
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.
