It's a Small World

When Clara and Dean met, they had no idea of what they were about to get themselves into. Neither knew about the strange world that the other lives with. All they were focused on was getting Clara back home.

But things changed. Their two worlds merged into one, causing lots of panic and confusion. Heaven has to deal with aliens, the doctor has to deal with demons, and the brothers have to deal with all of it; but with a little help, of course.