The turn of events in this episode was brilliant! The writing and acting was superb. Echoing what others have said, the show creator, Robbie Thompson, magically transformed this prequel to Supernatural into a sequel able to stand on its own two feet while remaining completely true to the original show. Episode 13 nicely wrapped up the season, managing to bring a satisfying resolution to the primary storyline, and clearly explaining Dean's role as promised in the pilot. For many Supernatural fans unhappy with the original series' finale, it also brought great satisfaction and cameos from key characters. Hope it will get renewed for a second season. Kudos!