There’s a lot that goes into the Supernatural formula to create a show that’s lasted for 13 seasons (thus far). And from the very beginning, one of the central elements of the show was horror. “[Creator] Eric [Kripke] intentionally set out to make a horror movie every week,” star Jensen Ackles says. “That’s when the genre was really taking off in the mainstream with The Grudge, The Ring, all those movies. We brought that cinematic experience to the small screen.”