When Supernatural debuted in 2005, the plan was never for it to run 15 seasons. The original Supernatural ending was meant to come in season 5, with creator Eric Kripke stepping away after wrapping up the apocalyptic showdown between heaven, hell, and two brothers in the middle. It was a tightly plotted arc that gave viewers a satisfying resolution, but also one that almost cut the show off just as it was finding new, unexpected ways to evolve.
