John Constantine () is a fictional character, an antihero appearing in comic books published by DC Comics. The character first appeared in a cameo with The Saga of the Swamp Thing No. 25 (June 1984), revealing himself completely in The Saga of the Swamp Thing No. 37 (June 1985), and was created by Alan Moore, Steve Bissette, and John Totleben. He serves as the lead character of the comic books Hellblazer (1988–2013) and Constantine (2013–present).