Astrotrain is a Decepticon Triple Changer, who acts as Shockwave's loyal righthand man. As the war between the Autobots and the Decepticons escalated over the years, Shockwave relies on him to take care of some of his side projects while he handles more pressing matters. Shockwave seems to have chosen wisely, since while Astrotrain's little more than a thug, he's a thug with smarts. He has no problem aiding his master in some of his more complicated plans with little to no supervision. And in battle, he can turn into a Cybertronian jet and a train to keep his enemies on his toes.