User blog comment:Touchinos/Supernatural Season 15: Endgame/@comment-4632123-20190324195502/@comment-31767970-20190326063439

Or Sam and Dean retired and the last scene is Adam looking at them from the window just like Sam in the end of season 5 but saying "You guys forgot about me" with a angry/psychopathic face as if he wants revenge for the negligence.