John Constantine is an occult detective and professional sorcerer from Liverpool, England. His gritty and brutal attitude makes him recognizable as a cynical, foul-mouthed, chain-smoking anti-hero. Because of his long stint as a Vertigo Universe character, he appeared exclusively in his own series Hellblazer for many years during which he aged in real time. He has been a member of Justice League Dark, the Newcastle Crew and the Trenchcoat Brigade. In addition, he has also acted as a supernatural adviser and ally to the Swamp Thing. John Constantine was created by Alan Moore, Steve Bissette and John Totleben; although an incidental character with a similar visual concept appears in Saga of the Swamp Thing #25 (1984), Constantine first appears in Saga of the Swamp Thing #37. (1985)