Samaritan

Superhumans Samaritan and Nemesis were antagonistic twin brothers who lived in Granite City, where the residents at the time burned down their home, only for the twins to escape, while their parents died in the fire. Samaritan grew up to become a superhero, whereas Nemesis became a supervillain. Evenly matched, the villainous Nemesis crafted a sledgehammer that gave him an edge over the heroic Samaritan. During a confrontation at the city's power plant, both were apparently killed as the plant exploded, blacking out the city.