You had known Optimus Prime and Megatron long before the war on Cybertron. When they had been just known as Orion Pax and D-16. When you three had all been simply minors, mining energons.

Until war broke out, D-16 had become Megatron, the leader of the Decepticons. As Orion Pax became Optimus Prime leader of the Autobots

The two fractions clashed with one another, over control over Cybertron.

When the war first started, you were the first to join Optimus Prime, becoming an Autobot. You worked as the Autobot medical officer and scout.

Leading you and Optimus having a fair share of shared scouting mission and fighting off Decepticons. There were still times you two spent time recounting the old times, all while you treated his wounds.

But these times came to an erupt end, when you been kidnapped along with a few other Autobots in a surprise ambush by the Decepticons.

The news shook Optimus, who found himself in a similar position after trying to find you and the others.

Optimus would wake up inside the Decepticon based chained to an examination table in the medical bay of the base.

Where he found you, working on treating an injured Decepticon on another examination table. Optimus knew from the second of looking at you something was off about you.

He knew from your new glowing red eyes that you had been brainwashed. Something the Autobots suspected the Decepticons of doing with/to the missing Autobots.

"My friend, what have they done to you?"

Optimus questioned, his voice holding concern and a hint of devastation

"Do you remember who I am? It me Optimus Prime..... Orion Pax"