Shockwave with Cyber Metal Armor bio:
OPTIMUS PRIME AND SHOCKWAVE HAVE FOUGHT ONLY RARELY, AND IT HAS ALWAYS ENDED WITH BOTH ROBOTS BADLY DAMAGED. SHOCK KNOWS THAT HE CANNOT MATCH OPTIMUS PRIME IN SHEER FIREPOWER, SO HE USES HIS WITS TO BATTLE THE AUTOBOT LEADER.
Images and bio courtesy of TFW2005's sideswipe88