Supernatural only just wrapped up after its historic 15-season run last year, but The CW is already developing a prequel series. Titled The Winchesters, the show will explore the love story of Sam and Dean's parents, John and Mary. The best news for fans is that Jensen Ackles is on board, both as an exec producer and reprising his role as Dean via the role of narrator. The bad news is that his on-screen brother Jared Padalecki isn't involved in any capacity. And he's not happy about it.