6x03 The Third Man

Sam and Dean call Castiel for help when they investigate a case about several dead police officers who seem to have been killed by the plagues of Egypt. Castiel confirms the staff of Moses was used to kill the cops and tells Sam and Dean that Heaven is in a state of chaos, as Castiel is in the middle of a civil war against the archangel Raphael, and God’s weapons have been stolen. The three head off to find the thief and come face to face with an old enemy.