Killrok was apparently one of the humans who were attacked by alien parasites during Bloodlines, as his metagene was activated he gained some level of Super Strength and as it appears rock-like skin. He was first seen battling another of the "New Blood" characters called Loose Cannon, as he was trying to push the agenda of appeasing his alien masters by sacrificing ordinary humans. After a short battle Loose Cannon eventually stopped him and turned him over to Metropolis Special Crimes Unit. His current whereabouts are unknown.