Devil's Trap

S1, E22: On a mission to save their father, John (recurring guest star Jeffrey Dean Morgan), from Meg (recurring guest star Nicki Aycox), Sam and Dean seek help from an old family friend, Bobby (Jim Beaver). When Meg shows up on Bobby's doorstep, the brothers lure her into a trap and exorcise the demon from her body after learning where John is being held prisoner. During the rescue attempt, a major battle ensues between the Winchesters and the demon they have been searching for all their lives.