Across This New Divide

When angels die... where do they go?

Well, like Death said, it's a big universe. You can't ever be really sure.

Sam and Dean recently loss Cas, a valuable member of the team, and are determined to get him back. They discover a spell that will allow one of them to travel beyond the mortal world to that of the long gone angels. They have to rescue Cas, and quickly, but he might not be the only angel they run into on the way.