The untold origin story of Optimus Prime and Megatron, better known as sworn enemies, but who once were friends bonded like brothers who changed the fate of Cybertron forever.
On a planet called Cybertron, a bunch of Energon fueled sentient robots roam around with a device fitted so they can transform into vehicles. In a city named, Lacon, a robot named Orion Pax sneaks off to watch a documentary the original Cybertrons had made. Unfortunately, Orion is caught by the security robots and is taken to prison, but his best friend, D-16 gets him out. Whilst the two get back to work in a cave, they trap another miner named Jazz, whilst their leader, Elita-1 gets blamed for the incident and is demoted.
Meanwhile, Cybertron leader, Sentinel Prime returns home from an expedition to the surface of the planet, claiming he had fought off invading quintesson aliens to return. He then organizes a race to celebrate. Orion and D-16 want to prove themselves as more than just mining robots and enter the race with jet packs, but ultimately lose. Sentinel is about to reward them for boosting morale, when the duo are once again caught and put to work in garbage disposal and incineration. While doing the job, the pair meet B-127 and they discover a chip in all the garbage with a distress signal from one of the primes called, Alpha Triton. Orion convinces, D-16, B-127 and Elita to travel to his coordinates with him. The latter coming along after seeing them hitchhiking a train.
The quartet travel up to the surface and discover a cave with a Trion all deactivated laying amongst prime corpses. They reactivate Trion and he reveals that sentinel had betrayed the primes and was working undercover for the quintesson aliens from earlier, handing them Energon supplies in return for allowing him to rule Cybertron. It is also revealed that he was the one removing the cogs from all the miners. Trion hands them cogs, so they can transform, as well as a chip, so they can deliver the evidence of sentinel and his betrayal. Soon after, he and his army arrive, capture and deactivate Trion.
The robots try and make back to lacon to reveal the evidence, only to be caught by the High Guard. Meanwhile, warbots are rebelling against Sentinel. D-16 takes care of defeating their leader, Starscream, however Orion begins to worry about his friends ever growing aggression, since learning the truth about Sentinel. Sentinel and his forces find them and begin fighting with them. Unfortunately, in the battle, the evidence chip is destroyed and D-16, B-127 and half of the High Guard are taken back to lacon by Sentinels army.
Elita encourages Orion to rally the other half of the High Guard and the rest of the clan and they make their way back to lacon. In the process, Elita broadcasts her memory recordings, while subduing Sentinels lieutenant and inspires the other citizens to help them defeat him. "Orion and D-16 successfully defeat Sentinel, but have a quarrel over whether to execute him or not and it ends up with D-16 unintentionally shooting Orion, killing him. D-16 watches as his friend falls to the ground. D-16, newly renamed, "Megatron", kills Sentinel and demands the High Guard destroy lacon.
The primus and prime spirits accompany Orion and give him the "Matrix of Power", reviving him and ultimately renaming him "Optimus Prime". Optimus then fights and defeats Megatron and the High Guard and exiles the pair. The Matrix restores Cybertrons now dry Energon rivers and all of the miners cogs. Optimus then goes and christens his entourage as Autobots, before sending the Quintesson aliens a warning message, to stay away from Cybertron. Megatron renames the High Guard, the Decepticons and the two plan to get their own back on Optimus Prime.
