Constantine: City of Demons is an American animated web series from executive producers Greg Berlanti and David S. Goyer. It is based on the DC Comics character John Constantine, a demon hunter and occult detective. Tangentially tied to the live-action series Constantine through actor Matt Ryan, the series is set in the DC Animated Movie Universe, is a spin-off of the 2017 animated film Justice League Dark and is an adaptation of the Vertigo graphic novel Hellblazer: All His Engines by Mike Carey and Leonardo Manco. The first half was initially released as five separate episodes on The CW's online streaming platform, CW Seed, on March 24, 2018, after premiering at WonderCon 2018. The series was released as a feature–length film released on DVD and Blu-ray on October 9, 2018, and later compiled and completed as two episodes on CW Seed on January 19, 2019.