Peter Girardi of Warner Bros. Animation has revealed that the animated series for CW Seed is based on the 2005 graphic novel Hellblazer: All His Engines from Mike Carey and Leonardo Manco.
The first five episodes were released on CW Seed on March 24, 2018 after premiering the same day at WonderCon 2018.
Synchronicity is a Police song, Constantine is based on Stings look from his performance in Brimstone and Treacle(1982). Synchronicity is also how John Constantine travels, he moves from place to place, and finds himself on airplanes or trains traveling to his destination.
Unlike the first season which was initially released as five short episodes, the whole second season was initially released as a one long episode.