Batman: Gotham by Gaslight - A League for Justice #1

Characters

Batman [Bruce Wayne] (Earth-19); Jonathan Kent (Earth-19); Martha Kent (Earth-19); Manhunter [J'onn J'onzz] (Earth-19); The Sentinel [Clark Kent; Kal-El] (Earth-19); Alan Scott (Earth-19); Wonder Woman [Diana of Themyscira] (Earth-19); Professor Adam Stange (Earth-19); Jay Garrick (Earth-19); Jimmy Olsen (Earth-19); Lois Lane (Earth-19); John Constantine (Earth-19); Pete Ross (Earth-19); Ra's al Ghul (Earth-19); Lex Luthor (Earth-19); Mercy Graves (Earth-19); Deadshot [Floyd Lawton] (Earth-19); Copperhead (Earth-19); El Diablo (Earth-19); Slipknot (Earth-19); Metallo (Earth-19); Cajun Crocodile [Killer Croc] (Earth-19); Harley Quinn [Harleen Quinzel; Vaudeville Villainess] (Earth-19)