Bio: One SAW Viper's cold-blooded actions proved tragic for the G.I. Joe team. Misunderstanding orders from Cobra Commander, Tomax and Xamot ordered the SAW Viper to execute a small group of Joes captured in Trucial Abysmia before the Battle of Benzheen. The ruthless, merciless Viper shot and killed seven of the unarmed Joes and seemed to enjoy it before the remaining Joes made their escape. After more Joes were killed by Cobra, the three survivors -- Duke, Falcon and Cross Country -- tracked down the SAW Viper to avenge their fallen comrades. Duke finally had the SAW Viper in his sights, unarmed. Duke couldn't bring himself to kill the defenseless man and left him where he found him. After initially worrying about the Joes' retaliation, Cobra Commander threw a party in the honor of the SAW Viper. After being last seen fighting in the Battle of Benzheen, that particular SAW Viper's current status was unknown.
Years later, He lead in front of the new Serpentor and offered a position in the new Cobra Coil and took the name Overkill. During the Second Cobra Civil War, Overkill went after General Hawk but Kamakura arrives in the nick of time to take him out. Over Kill has not been seen since.