Justice League Dark finds the world under attack from supernatural forces that prompts the Justice League's Batman to seek aid from occult investigator John Constantine. Constantine forms a team of other supernatural superheroes -- Swamp Thing, Deadman, Zatanna, and Etrigan the Demon -- to help save the world.This thrilling all-new animated film follows a branch of the Justice League that deals with mystical and supernatural threats. Based on the popular DC Comics books, Justice League Dark reveals the rowdy heroes who handle those situations deemed unfit for the traditional Justice League.