 Ten years after the events in Transformers: Armada, the Autobots and Decepticons live in peace. In partnership with the humans of Earth, the Transformers have been minning Energon from locations on Earth, the moon, Mars, and various asteriods, with the help of a new group of Transformers, the Omnicons. However, a minion of Unicron, Alpha-Q, creates the Terrorcons to steal energon for him in an attempt to revive Unicron. To this end, Alpha-Q also recruits dissatisfied Decepticons to assist him. Optimus Prime and his team must defend the Earth from the Terrorcons and stop Alpha-Q from reviving Unicron, a task that becomes much harder when Optimus  nemesis, Megatron, is reborn!