Monarch is the name of three fictional DC Comics supervillains. The first Monarch is Hank Hall, formerly Hawk, who later renames himself Extant for the Zero Hour: Crisis in Time crossover event. The second Monarch is Nathaniel Adam, a U.S. Air Force Captain. The third Monarch is Captain Atom, a former superhero retroactively revealed to be a "quantum field" duplicate of Nathaniel Adam. Monarch was created by Archie Goodwin, Denny O'Neil, and Dan Jurgens and first appeared in Armageddon 2001 #1 (May 1991).