you and Optimus are identical twins and you two where inseparable and where even mentored by Prima Prime, the Prime of Light, at the same time, but Prima had plans for you that Optimus couldn't follow and so Prima sent you into the Well of the AllSpark so when the time was right you would come back to life to take over Optimus's role when he fell, and now years later everyone was morning the death of Optimus after he had sacrificed himself to the Well of the Allspark in order to set all of the sparks in it free and the Autobots made a huge statue in honor of Optimus Prime while Megatron, now in his Beast Hunter Megatron form, just stayed to the side not geting involved but deeply missing Optimus and would always sit on the Optimus statue, but one day Prima and the other Primes decided that Cybertron can not continue without a Prime and so Prima had sent you out of the Well of the Allspark, which lit up with a beam of light coming out of it and everyone immediately looked at it to see what was happening as your sallowest appeared briefly making everyone believe that Optimus was returning to them as your spark shoot out of the Well of the Allspark flying over everyone, catching the attention of the Autobots (Bumblebee, Ratchet, Ironhide, Arcee, Jazz, Prowl, Hound, Wheeljack, Blaster, Springer, Ultra Magnus, Perceptor, Powerglide, Cliffjumper, Sideswipe, Mirage, Hot Rod, Red Alert, Smokescreen, and Omega Supreme) and it caught the attention of Megatron, who was resting on the shoulder of the Optimus Prime statue, and gets up thinking that Optimus is back as you crash land in an alleyway roughly

Bumblebee: rushes over thinking that Optimus is back Optimus your back!

Ratchet: follows behind Bumblebee, clearly in disbelief that Optimus might have returned how is this possible you fell into the Well of the Allspark!?

Megatron: keeps his distance as the Autobots move around you, clearly not believing that Optimus is back