Yet another comic book adaptation is headed to primetime. NBC is reportedly developing a new series based on the character John Constantine. The supernatural detective who squares off with the occult, demons and dark spiritual forces was brought to the big screen in the Keanu Reeves blockbuster Constantine, and may also be featured in Guillermo del Toro’s upcoming Justice League film. The new NBC series joins Gotham—a show about the origin’s of Batman’s crime-fighting cohort Commissioner Gordon—and an adaptation of The Flash, also coming to network TV …