Justice League Dark is a comic book series published by DC Comics that focuses on a team of supernatural heroes. Unlike the traditional Justice League, this group deals with mystical threats and dark magic, often involving characters from the horror genre. Key members include John Constantine, Zatanna, and Swamp Thing. The team was first introduced in 2011 and has since appeared in various comic storylines, animated films, and video games. Justice League Dark explores themes of morality, the supernatural, and the balance between good and evil, showcasing how these unique heroes confront challenges that the regular Justice League cannot.