The superheroine Vixen made her first appearance in "Action Comics" #521 (July 1981). To mark the 45th anniversary of the series, Lex Luthor and Brainiac were both given an updated appearance in issue #544 (June 1983). Lex Luthor dons his war suit for the first time in the story "Luthor Unleashed!" and Brainiac's appearance changes from the familiar green-skinned android to the metal skeletal-like robot in the story "Rebirth!". Keith Giffen's Ambush Bug character made appearances in issues #560, #563, and #565. "Action Comics" #579, written by Jean-Marc Lofficier and drawn by Giffen, featured an homage to Asterix where Superman and Jimmy Olsen are drawn back in time to a small village of indomitable Gauls. Schwartz ended his run as editor of the series with issue #583 (September 1986) which featured the second part of the "" story by Alan Moore and Curt Swan.