Optimus Prime (live-action movies)

Optimus Prime is the heroic leader of the Autobots and is an autonomous robotic organism from the planet Cybertron. He was once merely the leader of the Cybertronian Science Division, and was studying the Allspark. He had become close friends with the Lord High Protector, Megatron, and eventually came to see him as a brother. When one of the first 13 Transformers, a devilish machine now known only as The Fallen, corrupted Megatron, Optimus discovered he was the last of the Dynasty of the Primes. Megatron sought the power of the Allspark to take over other worlds and build a new Cybertronian Empire, and Optimus dedicated himself to stopping him, and the Civil War began. Prime and his team managed to launch the Allspark into space, and eventually discovered it on Earth. Optimus and his team arrived, and teamed up with the human Sam Witwicky to stop Megatron and destroy the Allspark. A few years later, Optimus was leading NEST, a human-Autobot alliance to hunt Decepticons hiding on Earth. They discovered The Fallen was planning his next move, and returned Megatron to life. The reborn Megatron fought and killed Prime, forcing Witwicky on a long quest to find a relic known as the Matrix which brought him back to life in Egypt. Prime combined with the Decepticon turncoat Jetfire, and defeated Megatron, and with a triumphant roar of "Give me your face!" he tore off the Fallen's face before ripping out his spark and showing it to him and crushing it in his hand, killing the evil machine.