Little is known of Zumo other than he was a hit man who had possibly killed a few people in the U.S and Eroupe, that is until he met up with Hawkman. The hit man Zumo was hired by and unknown person to kill an antiques collector who just happened be a long time friend of Federal Agent Casey Morgan. Then return the item in question (A Nth Metal sword) to the contractor. However after killing the man and before he could get the sword Hawkman showed up and fought with Zumo who he found could change or take the shape and form of anything living or not. The man also had almost super human strength. Just as Hawkman was about to take him down Federal Agent Casey Morgan of the Anti Vigilante Task Force from Metropolis showed up disrupting the fight and causing both men to fee the scene and Casey t