Eric Kripke's Supernatural had an impressive run at a whopping 15 seasons, but there were still some storylines the creator had in his back pocket but never used. The show started in 2005, and by the time it wrapped up in 2020, it gained a serious cult following. Supernatural evolved over the years from a mainly horror- and mystery-driven series into one that could also juggle zany comedy and science fiction elements.
Supernatural tells the story of two brothers, Sam and Dean Winchester (played
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