Oh, and in case you thought it was possible to watch clips from an upcoming episode without being spoiled... there are spoilers here.
We were already ready to storm the gates of Hell to see what happens next in Supernatural season five, but luckily, it looks like Hell is coming to us. And poor Sam — will he ever get his groove back? It's physically painful to rewatch the bits in season four where he keeps saying Dean doesn't have what it takes to get the job done, but he (Sam) does.
[via TV Overmind]