Optimus Prime
Sensing Optimus Prime and the Matrix of Leadership, Unicron resolves to finish the Autobot leader himself. He creates golem incarnations of himself to kill the Autobot. Though Optimus Prime pleas for the humans who evolved on Earth, Unicron dismisses them as parasites with the intent to slaughter them, once he finishes off Optimus Prime. The Autobots come to Optimus Prime's aid, with Megatron destroying the last golem, refusing to allow anyone else to kill Optimus Prime. He sides with the Autobots and guides them to the Earth's core to stop Unicron before he completely awakens. Despite using his anti-bodies and possessing Megatron's body to hinder him and the other Autobots, Optimus Prime uses the Matrix of Leadership to deactivate Unicron without destroying the Earth, though he loses his memory of being a Prime until the Autobots restore it.