We have the synopsis for Supernatural season 15 episode 6,
 
SUPERNATURAL 15.06 “Golden Time”: Sam (Jared Padalecki) and Dean (Jensen Ackles) are visited by an old friend. Castiel (Misha Collins) investigates the disappearance of a local teen. John Showalter directed the episode written by Meredith Glynn.
 
Who is the old friend? What kind of case is Cas investigating? Give us your thoughts in the comments or in the discussion thread for episode 15.06