First appeared in JLX #1 in 1996 and was created by Mark Waid, Gerard Jones, and Howard Porter. Arthur McKenzie is an amalgamation of DC's Aquaman and Marvel's Namor the Sub-Mariner, a metamutant (amalgamation of Marvel's mutants and DC's metahumans) and king of Atlantis who was a member of the All-Star Winners Squadron (DC's All-Star Squadron and Marvel's All-Winners Squad) during World War II and later a member of the Judgement League Avengers (an amalgamation of Marvel's Avengers and DC's Justice League) and the Justice League X-Men (an amalgamation of Marvel's X-Men and DC's Justice League).