The Flash #21 was published by DC Comics on December 1, 1988, as part of a series that began in 1987. Barbara Randall Kesel and Bill Messner-Loebs write, and art comes from Don Simpson, Greg LaRocque and Howard Simpson. This 36-page issue features Barry Allen, Wally West, Booster Gold, Oberon and Manhunter, among 11 characters cataloged on VerseDB.