While investigating a mysterious death in Chicago, Sam (Jared Padalecki) and Dean (Jensen Ackles) run into Meg (guest star Nicki Aycox), who is thrilled to see Sam again. The brothers soon discover Meg is behind the murders and attempt to catch her. Unfortunately, Meg is one step ahead of them and unleashes shadow spirits on the brothers to ambush them. Sam and Dean realize the trap isn’t for them, but for their father (Jeffrey Dean Morgan).
The episode was written by Eric Kripke and directed by Kim Manners.