Four months have passed and Dean awakes to find himself in a pine box -- he's been freed from Hell. He reunites with Sam and Bobby, but soon they all begin to wonder what pulled Dean out of Hell.
The Republic Tigers -- Fight Song, Jason Manns -- Visions, AC DC
-- You Shook Me All Night Long
Sam and Dean are thrown off guard when the spirits of Meg and Agent Henricksen accuse the brothers of failing them. Though stunned, the brothers must help Bobby, who is devastated after fighting angry ghosts of children he couldn't save.
Songs: Billy Squier -- Lonely is the Night
Dean is shocked to discover he has been transported back in time to Lawrence, Kansas. But the shock is short-lived after running into a younger John Winchester and Mary who are in love.
Dean is unaware why he was sent back but is enjoying his time with his parents and new-found grandfather, who may be the key to Sam and Dean's predicament.
Songs: The Allman Brothers Band -- Ramblin' Man
Sam and Dean learn Jack Montgomery is transforming into Rugaru, a flesh-eating monster. People infected are unaware as to what is going on until they turn into cannibals and begin to eat human beings. Sam tries to reason with Jack so that he will control his urges, but Dean refuses to believe that the urges can be subdued.
Sam and Dean look into a string of murders committed at Oktoberfest. The first victim is found with bite marks, leading them to believe they were caused by a vampire. However, the second victim appears to be killed by a werewolf. When a mummy rises from the crypt, Dean believes that a shape-shifting creature is behind the attacks.
Dean becomes the latest victim of a ghost sickness that causes the victims to steadily become more fearful until their hearts burst. With time running out, the brothers must figure out how to destroy the ghost responsible.
Songs: Survivor -- Eye of the Tiger
With Halloween quickly approaching, Sam and Dean must find a witch who is making human sacrifices in order to summon a demon. Meanwhile, Castiel returns with Uriel, an angel wanting to smite the entire town.
In a small town, a young girl's teddy bear comes to life. Sam and Dean discover that the town's wishing well really works, blurring the line between reality and fantasy.
Sam and Dean must team up with Ruby to find Anna, a girl who can listen in on angelic conversations... and who the demons want to acquire. Meanwhile, Sam fills Dean in on how he met Ruby during Dean's time in Hell.
While Castiel and Uriel seek out Anna, who can overhear angelic conversations, the Winchesters hide her from Heaven and Hell alike and discover the origins of her powers.
Songs: Bad Company -- Ready for Love
When the ghost of a young woman haunts an abandoned house, Sam and Dean investigate. However, the situation gets complicated when a family moves in and ignores the brothers' warnings.
The brothers investigate a magician's convention where the participants are dying off-stage from illusions that an older magician, The Incredible Jay, is performing on-stage.
Sam and Dean find out that a spirit is haunting one of their old schools. Through flashbacks we see what school was like for the Winchesters
Songs: Foreigner -- Long, Long Way From Home
Sam and Dean investigate murders in a small town and fall under the sway of the Siren responsible.
Songs: White Zombie -- Thunder Kiss '65
Dean and Sam investigate a town where no one can die... ever. Meanwhile, Alastair prepares for his next move against the forces of Heaven.
Castiel and Uriel recruit Dean to use the torture skills he honed in Hell to interrogate Alastair, who they believe knows which demon is responsible for the murder of seven angels.
Sam and Dean both work at a ironworks company. Dean is in sales and marketing, Sam in tech support. They don't remember each other, or their lives as Hunters. However, when a ghost starts causing suicides among the employees, the brothers have to learn quickly who and what they are, or die trying.
Songs: The Kinks -- A Well Respected Man
Dean and Sam learn that they're the protagonists in a series of cult novels detailing the adventures of two intrepid supernatural hunters. They confront the author, only to discover that he's the prophet of the Lord... and he's writing the Winchester Gospels. Now Sam must deal with the writer's next prophecy: that he gives in to Lilith.
The guys are on the road when a call comes in on their dad's old cell phone. A college student named Adam Milligan says that his mother's disappeared and he's trying to get hold of his father: John Winchester.
Songs: Burl Ives -- A Little Bitty Tear
Dean gets a message to meet with Castiel on important business, but he and Sam discover that Castiel has been recalled to Heaven and his human host body, Jimmy Novaks, has no memory of what happened or what Castiel knew. Unfortunately, the demon forces don't know that, and wouldn't care if they did, and will go to any lengths to get Jimmy for themselves.
Sam is plagued by horrendous nightmares and visions from his past as Bobby and Dean force him to go cold turkey to break his addiction to demon blood. Meanwhile, Castiel makes Dean a deal, and the demons break all but the last few Seals.
On the eve of the Apocalypse, Lilith plans to open the last seal and Dean and Sam find themselves on opposing sides. Zachariah reveals Heaven's intentions and Castiel must make a choice. And the nature of the last seal is revealed.
-- Carry On Wayward Son