After the war between the Autobots and Decepticons finally ended, with Cybertron restored permanently thanks to the power of the AllSpark, there has been peace for many years. However, war rises again when the Decepticons are hunting down a human girl named Hailey Witwicky, descendant of Spike Witwicky, the Autobots' first human ally, in search of the AllSpark. Optimus leads a small team of Autobots on Earth to protect the planet and Hailey from the Decepticons, and later the Predacons, the Quintessons, and Unicron.
