Bloodsport

Robert DuBois' wife was one of many victims who died during an incident when Brainiac arrives to collect Superman. As a former soldier, he uses his military skills to hunt down aliens and place them in an environment where they needed to survive or be hunted by Bloodsport, he makes the aliens as the prey and himself as the predator, starting from small alien threats such as Helgramitte to bigger threats such as Superman and Supergirl.