Powerhouses of metal and steel! Called to battle to fortify and reinforce the Autobots' front line. The first to roll in and the last to roll out. A formidable adversary when working as a team. Extremely smart and tremendously strong. Known for their ability to organize and build a towering fortress out of seemingly worthless junk. Each composed of high-density titanium steel for maximum resistance against enemy bombardment, Jet boosters under wheels provide short term flight capabilities.