The long-running show Supernatural has brought some of television's most haunting moments, combining horror, folklore, and dramatic storytelling in a manner that captivated viewers for 15 seasons.

In recent comments, Jensen Ackles compared Countdown's Mark Meachum to Supernatural's Dean Winchester, promising "a familiar ...

Even so, Supernatural is one of those rare shows that aired for so long that quality did not just slowly decrease over time.