#9: Supernatural
Under the watchful eye of creator and showrunner Eric Kripke, Supernatural was supposed to end with the season five finale episode “Swan Song.” Yet it continued on for another 10 seasons under four other showrunners. Not only did these additional seasons lead to disappointing character arcs, characters leaving, and haphazard plot points, but many fans also feel that the series’s actual ending was a letdown.
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