A key issue noted for First cameo appearance of Killer Croc. Detective Comics #523 was published by DC Comics on February 1, 1983, as part of a series that began in 1937. Dick Giordano and Gerry Conway write, and art comes from Adrienne Roy, Anthony Tollin and Ed Hannigan. This 36-page issue features Batman, Green Arrow, Killer Croc, Batman Who Laughs and Solomon Grundy, among 8 characters cataloged on VerseDB.