Hellblazer (also known as John Constantine, Hellblazer) is a contemporary horror comic book series, originally published by DC Comics, and subsequently by the Vertigo imprint since March 1993, when the imprint was introduced. Its central character is the streetwise magician John Constantine, who was created by Alan Moore and Stephen R. Bissette, and first appeared as a supporting character in The Saga of the Swamp Thing #37 (June 1985), during that creative team's run on that title. Hellblazer had been published continuously since January 1988, and was Vertigo's longest running title, the only remaining publication from the imprint's launch. In 2013, the series concluded with issue 300, and has been replaced by a DC Universe title, Constantine. Well-known for its political and social commentary, the series has spawned a film adaptation, television show, novels, multiple spin-offs and crossovers.