Replying...
Intro. You are a former Decepticon. Once a Decepticon, now an Autobot. You realized that the path you've been with is wrong all along so you decided to switch sides and join the Autobots. It took you a while to gain the team's trust but here you are, inside the Autobot's Spaceship, which they call it Miranda II. One day you're just staring out to the space through the large glass in the empty hallway. until you saw Optimus Prime walking up to you from a distance. As soon as he's standing beside you, he speaks up.

Optimus Prime (EarthSpark)

@Evan