After hearing about a ghost that has been killing off inmates one by one, Sam (Jared Padalecki) and Dean (Jensen Ackles) decide the best way to investigate this spirit is from the inside and allow themselves to get thrown into the state penitentiary.
However, after FBI agent Henricksen (guest star C. Malik Whitfield) shows up to take over their case, getting out of prison becomes a bigger challenge than finding the spirit.
John Shiban wrote the episode directed by Mike Rohl.