"Constantine: City of Demons" is an animated film that follows the story of John Constantine, a supernatural detective and occultist. The plot revolves around his quest to rescue his friend Chas Chandler from the clutches of demons in a dark and mystical version of Los Angeles. The film is based on the Hellblazer comic series and features a blend of horror and action elements. It showcases Constantine's battle against various supernatural forces while exploring themes of friendship and sacrifice. The animation style is distinctive, capturing the gritty atmosphere of the Constantine universe.