Constantine is a 2005 movie based on the DC Comics Hellblazer character John Constantine. Use this tag only for questions about the movie.
Constantine is a 2005 action/horror film, based on characters from the DC Comics Verigo series Hellblazer. It stars Keanu Reeves as John Constantine, a detective who possesses the ability to see half-breeds (humans that are half demon or half angel), as well as an extensive knowledge of the occult and magic rituals.
The movie was based loosely on the Hellblazer comic story arcs "Dangerous Habits", which details Constantine's lung cancer and its subsequent cure, and "Original Sins", which includes a similar attempt to unleash the Anti-Christ on Earth.
Despite being considered a poor adaptation of the source material (containing a significant number of changes to the character), the film was financially successful and there were rumors discussions about a sequel for many years. However, with the creation of the dc-extended-universe, the chances of a direct sequel to Constantine have decreased (though the character has been mentioned in connection to a Justice League Dark movie).
The 2014 NBC television show Constantine is based on much of the same source material (the Hellblazer comics "Original Sins" story) but is otherwise unrelated to, and essentially a reboot of, this movie.