Original air date: 09/18/2008 Runtime: 42:32 min. In the fourth season premiere, it's been four months since Dean was dragged away by the hounds of Hell, the result of a deal he made with the Crossroads Demon in exchange for his brother's life. Now, Dean wakes up in a pine box. He's been freed from Hell, but he doesn't know how or why. He has a joyful reunion with Sam and fellow demon hunter Bobby (recurring guest star JIM BEAVER), but it isn't long before the three start to really wonder what exactly pulled Dean from Hell -- and what it will want in return.
Original air date: 09/25/2008 Runtime: 41:06 min. Sam and Dean are stunned when the spirits of Meg (recurring guest star NIKKI AYCOX - "Cold Case," "Ed") and Agent Henricksen (recurring guest star C. MALIK WHITFIELD - "The Guardian") appear and accuse the Winchesters of failing them. Although rattled, the brothers must pull together to save Bobby (recurring guest star JIM BEAVER), who is too crippled with guilt to fight off the angry ghosts of the young children he couldn't save.
Original air date: 10/02/2008 Runtime: 42:35 min. Dean is transported back in time and is shocked when he lands in Lawrence, Kansas. However, that shock turns to amazement after he runs into a young John Winchester (guest star MATTHEW COHEN - "South of Nowhere," "Medium") and Mary (guest star AMY GUMENICK - "Greek") who have just fallen in love. Dean isn't sure why he was sent back so he begins to enjoy the time with his parents and newfound grandfather (guest star MITCH PILEGGI - "The X-Files," "Stargate: Atlantis"), who may be hiding a secret that is key to Sam and Dean's entire predicament.
Original air date: 10/16/2008 Runtime: 42:13 min. Shown entirely in black and white, Dean and Sam investigate several murders at Oktoberfest. The first victim was found with bite marks on her neck, much like a vampire would leave, while the second victim has wounds that look like a werewolf attack. After a mummy rises from his crypt, Dean determines that a shape-shifter demon is terrorizing the town as iconic monsters from the old Hollywood movies.
Original air date: 11/06/2008 Runtime: 40:27 min. Sam and Dean investigate a small town where a wishing well works so well that a teddy bear comes to life, someone wins the lottery and the town geek gets a hot girlfriend. The brothers realize, however, that while everyone is happy now, the end result could be disastrous.
Original air date: 04/23/2009 Runtime: 41:59 min. A 19-year-old boy named Adam (guest star JAKE ABEL - "Flash of Genius") calls Sam and Dean looking for John Winchester; the boy claims to be his son. Dean and Sam meet Adam, assuming he's a demon trying to lure them into a trap. However, they find out that John was, indeed, the boy's father and Dean is infuriated when he hears Adam tell of his "normal" upbringing.
Original air date: 04/30/2009 Runtime: 38:27 min. Castiel (recurring guest star MISHA COLLINS) appears to Dean in a dream and says he has something important to tell him but they need to meet somewhere private. Dean and Sam go searching for Castiel, but instead find Castiel's human vessel, who has only a spotty recollection of being an angel and wants to return to his family and normal life. Dean and Sam, however, are concerned about his safety.
Original air date: 05/07/2009 Runtime: 42:31 min. Dean and Bobby (recurring guest star JIM BEAVER) lock Sam in Bobby's panic room so he can detox from the demon blood. However, as Bobby sees more seals are being broken he tells Dean they should let Sam out to help them fight the impending apocalypse. Dean disagrees and goes to Castiel (recurring guest star MISHA COLLINS) for help. Sam and Dean have a big blowout confrontation.
Original air date: 05/14/2009 Runtime: 42:35 min. The apocalypse is coming, and Sam and Dean prepare for the fight in very different ways. Sam joins Ruby (recurring guest star GENEVIEVE CORTESE) on a final run to kill Lilith (recurring guest star KATHERINE BOECHER), while Castiel (recurring guest star MISHA COLLINS) and Zachariah (guest star KURT FULLER) tell Dean it's time to play his part in stopping Lucifer.