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.

Her name isn’t really Darcy, of course: her true name is something much older and a damn lot more powerful. Norse gods weren't the only supernatural beings in New Mexico when Thor was there.

“Eternity is really rather boring, John. Mortal life seemed as though it would be far more interesting.” Sherlock is actually the Devil, but he decided to live as a mortal because ruling Hell was boring.

The thing that made it so easy to hide was that everyone knew what dragons were supposed to be like. John heard people wonder about Sherlock sometimes, sending him slanting, speculative glances, as they questioned his lineage. But John Watson, who was steady, reliable, even-tempered? He slid right under their radar, just another average human being in a world full of them.

In which Darcy Lewis is actually Hel Lokisdottir, Queen of Helheim, and Phil Coulson is the badass secret agent we all know and love.

Sherlock has just run off in a whirlwind of coat without a word, leaving Scotland Yard cursing his name. It’ll be a while before they can get someone to translate this, and meanwhile that tall know-it-all bastard has gone off to do god-knows-what without bothering to even tell them what the note says. John edges forward in the middle of the uproar, and surreptitiously glances at the note. Androvy, it says briefly. The warehouse at five. Serdyukov. John seems like such an ordinary bloke. Appearances can be deceptive.

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

Sam smiles, bright and luminous. "An angel's Grace isn't just power, Dean. It's a part of their soul." An AU 'verse that takes place after episode 5.22.

"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.

“Your first mistake,” John says smoothly, “was calling yourself Moriarty. It got my attention.” In which Jim is not, in fact, Moriarty.

Loki falls from the Bifrost, and lands in Lilo's garden. Chaos ensues.