This episode sure looks like it's gonna be a big one, based on the amount of spoilers coming out regarding it. This one pertains to why the boys are going back to the Old West, a reason lots of us probably suspected, but has now been confirmed by Watch With Kristin. Enjoy the spoiler and the new photo!
Sam and Dean hafta go to the Wild West to track down a weapon (the Colt, yes?) that could kill that Mother of All be-yatch.