Supernatural - Shut Up, Dr. Phil

In this week's episode we meet a married couple that also happen to be witches, the Starks (guest starring Charisma Carpenter & James Marsters).  Sam and Dean go to Prosperity, Indiana to investigate some suspicious deaths.  At each one they find an old coin and they figure out it was done by witches.  Then they find out that Maggie & Don Stark are a married couple that are separated and are mad at each other.  Apparantly Don cheated on Maggie and now she's getting her revenge.  Dean & Sam finally get them together and when they are unable to kill them since they are too powerful, Dean gets them to talk things out.  They make up and let Sam and Dean go.  Back in their hotel room, the Leviathan that has been following them comes and Don comes and knocks him out.  He is there to retrieve a coin that Maggie left.  So now Dean & Sam have a Leviathan in their back seat and they are on their way to Bobby's.