John Constantine, also known as Hellblazer, is an antihero who appears in American comic books published by DC Comics. He was created by Alan Moore, Steve Bissette, and John Totleben, and first appeared in Swamp Thing #37. Initially a supporting character who played a pivotal role in the "American Gothic" Swamp Thing storyline, Constantine became popular with readers. As a result, he received his own comic in 1988 titled Hellblazer, which became the longest-running and most successful title of DC's Vertigo imprint. In the DC Universe, Constantine, the titular Hellblazer, is portrayed as a working-class warlock, occult detective, exorcist, and con man from Liverpool who is stationed in London. Known for his cynicism, deadpan wit, ruthless cunning, and constant chain smoking, he is also a passionate humanitarian with a deep desire to make a positive impact.