Lex Luthor isn’t Superman’s strongest villain. Darkseid’s Omega Beams allow him to inflict serious pain on the Man of Steel, while Doomsday’s fists are enough to knock the hero down for the count.

Created by writer Gardner Fox and artist Mike Sekowsky for 1964's Justice League of America #29, "Crisis on Earth-Three," Ultraman was introduced as a Superman figure from an alternate reality, called ...