Optimus Prime is character from the Transformers: The Movie Prequel comics.
For two generations, Optimus Prime ruled Cybertron side-by-side with Megatron. The two personalities created a balance; Prime was fair while Megatron was firm. However, when Megatron revealed his intentions to steal the All Spark and use it for evil, selfish gain, Prime reacted accordingly. He formed the Autobots, a militia from the civilians around him, but they fared terribly against Megatron's armies, the Decepticons. Ultimately, Prime was forced to eject the All Spark into space to keep it from his nemesis. Unfortunately, Megatron tracked the All Spark to Tyger Pax, where Bumblebee's unit was trying to slow down the Decepticons. Prime and the Autobots were held up in Simfur, and unable to come assist. Fortunately, Bumblebee's unit succeeded, and the All Spark was ejected into space, but Cybertron was sentenced to a slow death. The Autobots were forced to abandon the planet.