Energon

Some time after the destruction of Unicron, the remaining Autobots and Decepticons team up for a short time. Quickly, though, a new threat appears, the Terrorcons, who steal Energon for their master, Alpha Quintesson who was re-started up by Unicron to keep him from going off-line. Megatron is soon resurrected using the Energon Alpha Q stole in order to bring back the worlds destroyed by Unicron, he then confronts Alpha Q, Alpha Q uses Unicron's head to escape but as Megatron grows in power, a dormant and utterly evil force seems to awaken from within. After Alpha Q disappears, Megatron then gathers Energon to repair Unicron's body to use it for himself. He gets Unicron back online, but then fights against the Autobots. At some point Unicron is able to control Megatron's body. Unicron's body is destroyed with only a small black ball remaining, but his mind survives inside Megatron which leads him to super energon that turns him into Galvatron. Prime then uses the rest of super energon on the black ball to turn it into a sun for Alpha Q's planets.