Shadow

S1 E16: While investigating a mysterious death in Chicago, Sam and Dean run into Meg (recurring guest star NICKI AYCOX), who is thrilled to see Sam again. But the brothers soon discover that Meg is responsible for several murders and attempt to catch her. Unfortunately, Meg remains one step ahead of them and unleashes shadow spirits to ambush the brothers. Sam and Dean ultimately realize the trap isn't for them but for their father, John (recurring guest star JEFFREY DEAN MORGAN).