Smallville and Supernatural were the biggest shows on the air on The CW, so why the hell did the shows never crossover?
Where Supernatural ran for 15 years on The CW, the show's prequel The Winchesters only lasted a single season. Here's what led to the series' demise.
The new series, which chronicles the love story between Dean and Sam Winchester's parents, John and Mary, premieres Oct. 11 on The CW.