Supernatural creator Eric Kripke has shared his view on why the fantasy horror series blew away its original five-season plan to run for 15 years and 327 episodes. Although it has been several years since the Jared Padalecki and Jensen Ackles-led series came to an end, talk of a revival has already been spreading across social media, and Kripke believes there is a reason why the story of the Winchester brothers continued for so long.