Constantine is based on characters appearing in the comic series Hellblazer from DC Comics. John Constantine, a demon hunter and dabbling master of the occult, is a man waging war against the forces of darkness — from both within himself and the outside world. He fights the good fight - or at least he did. With his soul already damned to hell, he';;;s decided to abandon his campaign against evil until a series of events thrusts him back into the fray when an old friend';;;s daughter becomes the target of supernatural forces.