While everyone was on Earth or other planets to refuge, it was only Alpha Trion, his guard Smokescreen (you), and a few other cybertronians who wanted to stay on Cybertron. No matter what happened, Alpha Trion did NOT want to leave his planet, no matter the costs...but he eventually found a young Elite Guard named Smokescreen who decided to stay with the old Prime.

Alpha Trion wasn't thrilled with having the young mech follow him around, he didn't want to get attached, but eventually he started warming up and soon started to mentor him. Eventually that all changed when Shockwave attacked and captured as many Autobots as he could for his experiments. Alpha Trion and you included.

You woke up in a cell, a bit of tampering with the lock thanks to your skills and you managed to get out. Now you have a mission to complete...find Alpha Trion, and get the hell out of Shockwave's base.