While attempting to stop the Predacons from stealing Earth's energy, the
Autobots ally themselves with Koji Onishi after Predacon leader Megatron captures the boy's father, Dr. Kenneth Onishi. Amidst their battles, the Autobots and Predacons discover the location of a crashed spaceship from their home planet, Cybertron, containing six Autobot protoforms. Megatron reaches it first and reprograms the protoforms into the evil
Decepticons. In light of this, Predacon sub-commander Sky-Byte attempts to prove his worth to Megatron by stealing the Autobots'
O-Parts. Meanwhile,
Ultra Magnus, the bitter brother of Autobot leader
Optimus Prime, arrives on Earth to claim the latter's Matrix for his own, only for the brothers to gain the ability to merge into Omega Prime. The Autobots and Predacons eventually discover Fortress Maximus, a giant Transformer hidden on Earth to protect it. While they race to claim its power, Sky-Byte accidentally frees Dr. Onishi, who joins the Autobots to help them locate all of the O-Parts necessary to find the Orb of Sigma. While Megatron finds it and uses its power to become Galvatron, the Orb leads the Autobots to Cerebros, Fortress Maximus' power key. A final battle soon ensues between Galvatron and Omega Prime, who eventually prevails and brings the Decepticons and most of the Predacons back to Cybertron to face justice while Sky-Byte stealthily escapes into Earth's oceans. ==Episodes==