Guy Gardner returned to Earth to pick a fight with Superman but eventually rejoined the Justice League and helped battle the monster Doomsday, in which he and his teammates were brutally beaten and Superman was killed during the creature's defeat. During the Reign of the Supermen storyline when four different versions of Superman appeared after his death, Guy fought, became allies with and later endorsed the Last Son of Krypton Superman, who was actually the Eradicator. Later, Guy cleared his name of murder that was committed by his Draalian clone "Joe Gardner" and learned that his brother Mace had become the assassin Militia; after a brawl between the two, Guy decided to take the codename Warrior.