The Devil is coming.
While this fact has been confirmed via a series of Supernatural spoilers, it's eerily teased in the promo below.
Mark Pellegrino will take on the role of Lucifier. He's not seen in the following video, but he's very much referred to...
[video url="http://www.tvfanatic.com/videos/supernatural-season-five-trailer/" title="Supernatural Season Five Trailer"] [/video]
Season five of Supernatural premieres on September 10, immediately following The Vampire Diaries.