Optimus Prime is the heroic leader of the Autobots, and is rumored to be the oldest.
9,000,000 years ago on Cybertron, a being kown as Alpha Trion exsisted. Trion one day created 2 robots named Optimus Prime and Ultra Magnus. He also created a power called The Matrix. Optimus Prime was the one chosen to hold the Matrix. One day, an evil being named Alpha Pychis killed Trion, as Optimus and Magnus created an elite team kown as the Autobots. They battled the evil Decepticons, lead by Megatron. They battled for millions of years until Prime got killed by Unicron. He passed the Matrix on to Ultra Magnus, but ended up in Bumblebee's hands, as he destroyed Unicron. Sky Lynx soon brought Prime back to life, as Bumblebee gave him back the Matrix. Prime continued to lead the Autobots, along with arresting Megatron and every other Decepticon.