5.03 "Free to Be You and Me"

Not sure he trusts himself, Sam decides to give up hunting and goes off on his own. But that night, a late-night visitor tells Sam that he won't let him off the hook that easily. Dean, intent on stopping the Apocalypse, continues hunting on his own and teams up with Castiel to find the Archangel Raphael since Castiel believes Raphael knows the location of God's vessel on Earth.