Overview
Justice League Dark is a 2017 American adult animated science fantasy superhero film produced by Warner Bros. Animation and distributed by Warner Home Video. Featuring the DC Comics team of the same name created by Peter Milligan and Mikel Janín, the film is the 28th of the DC Universe Animated Original Movies and the eighth of the DC Animated Movie Universe. Unlike most installments in the DC Animated Universe Movies series, Justice League Dark features an original premise. The film stars Matt Ryan as John Constantine and Jason O'Mara as Batman, reprising their respective roles from previous media. It was released on Digital HD on January 24, 2017, and on DVD and Blu-ray on February 7.
A sequel, Justice League Dark: Apokolips War, was released in May 2020.
Plot
Law-abiding citizens begin to murder people, believing their victims to be demonic creatures. The Justice League gather to conclude that magic is the source of the crimes, but Batman is skeptical. Later that night at Wayne Manor, he finds a written message on his walls telling him to find Constantine.
In a flashback to five days ago, John Constantine and Jason Blood engage the Demons Three in a high-stakes poker game. Constantine offers his home, the House of Mystery, in exchange for a box of artifacts, including a chipped Dreamstone. When both parties are caught cheating, Constantine magically forces Blood to summon Etrigan to dispatch the demons. Afterward, Blood reprimands Constantine and the two part ways.
From Wikipedia (CC BY-SA 4.0).