Gaiman revisited Hell as depicted by Alan Moore in "Swamp Thing", beginning with a guest appearance by Jack Kirby's Etrigan the Demon in issue No. 4 (April 1989). The story introduces Hell's Hierarchy (as their entry is titled in "Who's Who in the DC Universe"), headed by Lucifer (who would spin off into his own series in 1999), Beelzebub (later adversary to Kid Eternity), and Azazel, whom Dream defeated later in the series. Dream visited the Justice League International in the following issue, No. 5 (May 1989). Although multiple mainstream DC characters appeared in the series throughout its run, such as Martian Manhunter and Scarecrow, this would not be the norm. Gaiman and artist Mike Dringenberg introduced Death, the older sister of Dream, in issue No. 8 (August 1989).