Half-machine, half-human, Overkill is the ambitious leader of the Cobra B.A.T. army. He has developed highly advanced micro-circuitry in his mad quest to create the perfect android army. Using the original Cobra B.A.T. robots for parts, he began his experiments with the V3 Cobra B.A.T. trooper, constructing what amounted to an animated weapon system. Growing more ambitious, he constructed the V4 Cobra B.A.T. force, tougher to destroy and more heavily armed. His greatest achievement so far is the V5 Cobra B.A.T. army, a deadly force of androids programmed for self-modification: blow them apart and they join together in deadly new combination. Lock and load, because the battle is about to begin between the G.I. Joe team and the Cobra B.A.T. attackers!