"I'm Lucifer. I always have been. I just didn’t know it for like, the last five thousand fucking years, not until you broke the seal and I got my Grace back and realised exactly how much I was screwed over. Okay, so maybe there’s a few assholes I’d really like to explode, but really, I mostly just want to stay under the radar and get my head sorted.”
After the final Seal is broken, Dean discovers that he's actually Lucifer. He's not really sure how he feels about that. The forces of Heaven and Hell aren't exactly making things easier.
- Part 1 of Sympathy for the Devil