A companion series centered on Archie comics character Sabrina, titled The Chilling Adventures of Sabrina, is in the works at the younger-skewing network, The Hollywood Reporter has learned.The hourlong drama reimagines the story of Sabrina the Teenage Witch as a dark coming-of-age tale that traffics in horror, the occult and witchcraft, naturally. The new iteration is described as in the vein of Rosemary's Baby and The Exorcist and finds Sabrina wrestling to reconcile her dual nature as a half-witch, half-mortal while fighting the evil forces that threaten her, her family and the daylight world humans inhabit.Riverdale showrunner Roberto Aguirre-Sacasa is penning the adaptation, which is being eyed as a companion for Riverdale that would potentially debut in the 2018-19 TV season. He will exec produce with Greg Berlanti, Sarah Schechter, Jon Goldwater and Lee Toland Krieger, who will direct the pilot should the project move forward. Berlanti Productions will produce in association with Warner Bros. TV.Riverdale has since become an important part of The CW's schedule. It was the only freshman drama to earn a season two renewal and has enjoyed a nice boost since the entire first season became available on Netflix this past summer, which network president Mark Pedowitz touted to reporters in August at the Television Critics Association summer press tour.