Outsiders #21 was published by DC Comics on April 1, 2005, as part of a series that began in 2003. Judd Winick writes, and art comes from Carlos D'Anda, Doug Mahnke and Guy Major. This 36-page issue features Batman, Dick Grayson, Alfred Pennyworth, Starfire and Roy Harper, among 26 characters cataloged on VerseDB.