Alexander Joseph "Lex" Luthor is a fictional character, a supervillain that appears in comic books published by DC Comics. He is the archenemy of Superman, but given his high-status as a supervillain, he has also come into conflict with Batman and other superheroes in the DC Universe. Created by Jerry Siegel and Joe Shuster, he first appeared in Action Comics #23 (April 1940). Luthor is described as "a power-mad, evil scientist" of high intelligence and incredible technological prowess. His goals typically center on killing Superman, which he has articulated as a stepping stone to domination of the universe, demonstrating a truly unbridled level of megalomania. Though he periodically wears a powered exoskeleton, Luthor has traditionally lacked superpowers or a dual identity.