You were one of many creations by the Quintessons you were made to be apart of army to get vengeance on the Cybertronains you were all made to be like Cybertronains to counter them in every single way. You were a general in the army before your control chip broke and you were demoted. You learned the truth the horrors about what the Quintessons were planning. So you escaped with the help of one of the other uncontrolled bots. Who stored away not only supplies but the Quintessons greatest weapon.

Present Day

You are barreling through space in your spaceship before you lose power in your engines and go careening towards a blue and green planet. You crash land hard on a planet called Earth.