Image Credit: Courtesy of A24 Backrooms introduces moviegoers to an eerie, "otherworldly dimension," according to its logline. Based on a concept from a 2019 4chan thread post, the upcoming A24 sci-fi, found-footage horror movie is bound to leave viewers shaking in their seats. And with an all-star cast, fans can't wait to see how leads Renate Reinsve and Chiwetel Ejiofor carry the story. The rest of the cast features Mark Duplass, Finn Bennett, Lukita Maxwell and Avan Jogia.