John Constantine, the (anti)hero of "Constantine," is a man for whom the phrase "deal with the devil" is a bit more literal than most. The occultist tackles all sorts of demonic and supernatural incursions on our world, all while trying to atone for his past mistakes and literally save his soul.
Although the series only lasted for one season on NBC, from 2014 to 2015, this version of the character was retroactively integrated into the Arrowverse. John Constantine appeared in a fourth-season episode of "Arrow," then joined the main cast of "Legends of Tomorrow" beginning in its third season.
