In which Dean turns out to be the archangel Michael (surprise!) and decides that they're doing this Apocalypse thing his way (i.e. not at all), the rest of Team Free Will (plus Gabriel) help out, and the Host, the demons, and various other characters are along for the ride (eg. fellow archangels, grumpy hunters, hapless prophets, etc). Alternate universe.

What it says on the tin. (Including Follow-ups to: Maybe one of these days you can let the light in, and One Of Those Things, and Mrs and Mr Pond..)

Discovering that you have some kind of angel-marriage, soulbond-thing to your nerdy angel friend kind of forces you to re-evaluate your relationship. In Dean's case, this involves freaking out and massive fail.

After the final Seal is broken, Dean discovers that he's actually Lucifer. He's not really sure how he feels about that.

"Sorry, you have me confused with the other angel. You know, the one in the dirty trench coat who's in love with you." Dean and Castiel finally have that conversation.