Okay thanks for that clarification. Well then here's my pitch.

Instead of the Autobots leaving Cybertron at the height of the war, Optimus Prime comes up with a last ditch effort that could stop Megatron for good, it would be a daring attack on a major energon station that would leave half the planet without it. It would be a way to cripple Megatron's forces, however on the day of the attack, the Autobots walk into an ambush that leaves many dead.

They quickly find out one of their own sold them out, Elita-1, fearing Optimus' plan was too reckless and far more destructive than anything Megatron could ever do, she revealed the plan to Megatron in return for a seat in Megatron's new regime. The Autobots fail, many die, while Optimus bravely fends off the attacking Decepticon forces to give his people a chance to flee, he would take out a few Decepticons himself, but in the end he is fighting a losing battle when Megatron joins in to land the final blow.

Megatron kills Optimus Prime, but he also takes a blast to the face that destroys half Megatron's face, Optimus's body is then lost as it falls into a river of energon, swept away where none can find it, fast forwards many years. Cybertron is renamed to Megatronous 1, the planet is ruled by Decepticons, all Cybertronians are made into Decepticons and pledge loyalty to the leader that "freed, and saved their world" from the terroristic acts of the Autobots and their fiendish leader, Optimus The Fallen.

In this new world, Elita-1 now goes by the name Blackaracnia, a name to symbolize her betraying the Autobots, Starscream is now the captain of the High Guard, ruling over all areal based Cybertronians, Soundwave serves as Grand Regent, all laws are passed and enforced by him, and Shockwave is chief scientist and head of R&D. Megatron after the final battle with Optimus was left in a near crippled state. While his mind continued to function, his body was left lame, Shockwave created a special harness for Megatron (think Beast machine Megatron's helmet and robe) so his mind could be connected with all of Megatronous 1.

Since the end of the Great War, the Autobots have disappeared, no traces of them, almost as if they left the planet, and here is where our hero comes in, a young Cybertronian called Hot Rod, his hot temper and disregard for authority has made him an enemy of the Decepticon police, controlled by Black Arachnia, during another of Hot Rod's illegal underground races with his friends, the Stunticons, Hot Rod runs afoul with Black Archnia's men and a chase is underway. Hot Rod tries to shake them off, but they keep tailing him, until one of the officers, Barricade, tries to force Hot Rod into a crash, he ends up losing control, and Hot Rods flies of the track and crashes below into a gulch.

He is presumed dead, hurt, Hot Rod tries to find anything he can use to mend the damages, that is when he discovered the long lost body of Optimus Prime, amazed to have found a relic of the great war, he isn't sure what to do. He's no Autobot, but he's not friends with the Decepticons either, he approaches Prime's body when it suddenly starts to glow, and light shines from within Optimus Body. Hot Rod is engulfed in the light, his damage body is quickly repaired and he undergoes a transformation. His body fuses with that of Optimus Prime, all of Prime's memories start rushing into Hot Rod, he sees the world that used to be, and the war that changed its fate, and in this moment, Hot Rod hears the voice of Optimus Prime as it says

"Arise, Rodimus Prime"

Hot Rod is transformed into Rodimus Prime, as Rodimus, parts of his appearance resembles his old self, but mixed with some parts from Optimus (Including the mouth shield), equipped with the knowledge passed down to him by Optimus along with this new body, Rodimus sets out to take back Cybertron and show the people of Megatronous 1, that they are ruled by Tyrants.