Devil's Trap

Sam and Dean, in order to save their father from Meg, enlist the help of a family friend, Bobby. When Meg shows up at Bobby's, the brothers are able to exorcise the demon from her body and get her to tell them where their father is being held. Sam and Dean race off to rescue their father, resulting in a final showdown between the Winchesters and the demon they have spent their lives looking for.