Hi! This is a long shot request because I'm so vague on the details but maybe one of you guys recognizes it? All I can really remember is that Dean and Sam tangle with the Wild Hunt (faery) and there is a reveal at the end that the leader of the Hunt was John. I don't think the boys ever figured it out for sure although they suspected it. And that's all I have so yeah, it's a long shot. Thanks for reading! :)