Surely Heaven Waits For You (Percy Jackson/Supernatural)

This takes place soon after the Giant War. Of course they had won but now a new enemy raises that the demigods don't know about. All but Percy.

And boy does that enemy want his head on a stick. They all do.

Now Percy hasn't been "hunting" in a few years. But now he's getting calls and he's been tuned into the Angel Radio.

Dean Winchester has turned. Castiel and Sam need help. And fast.

This my peoples.

Is the apocalypse.