4.2: Average ranking among WB/CW series in total viewers over the course of its 15 seasons. Its lowest finish was ninth in 2006-07, The CW's inaugural season. 4: The number of times its initial audience has fallen below 1 million viewers, all in the final season.

The top reason why Supernatural became worse after season 5 in particular is because of certain staff changes that occurred at this point. From the start, Eric Kripke was the creator and main showrunner of Supernatural. He gave the show its dark, grungy ambiance and horror-centric themes.