Prologue

Sam Witwicky and his new girlfriend, Carly join the fray when the Decepticons renew their longstanding war against the Autobots and the Justice League. Optimus Prime believes that resurrecting ancient Transformer Sentinel Prime, once the leader of the Autobots, may lead them to victory. That decision, however, has devastating consequences; the war appears to tip in favor of the Decepticons leading to a climate battle in Chicago.