01. Exile On Main St.:
It's a year later and Dean (Jensen Ackles) has given up hunting and is living with Lisa (guest star Cindy Sampson) and her son Ben (guest star Nicholas Elia). Mysteriously freed from his cage in hell, Sam (Jared Padalecki) finds Dean and tells him he needs to rejoin the fight and introduces Dean to a world-a family-he never even knew existed: the Campbells, his mother's family, lead by none other than their Grandfather Samuel (Pileggi).
02. Two And A Half Men:
Sam (Jared Padalecki) investigates a case about missing babies whose parents are being murdered. At one of the crime scenes, he discovers a baby that was left behind and calls Dean (Jensen Ackles) for help. Reluctant to leave Lisa (guest star Cindy Sampson) and Ben (guest star Nicholas Elia), Dean finally agrees to meet Sam and surprises his brother with how parental he has become. The brothers take the baby to Samuel (Mitch Pileggi), who decides to raise it as a hunter, which infuriates Dean. However, before they can decide the baby's future, a shape-shifter breaks in and attempts to kidnap the baby.
03. The Third Man:
Sam (Jared Padalecki) and Dean (Jensen Ackles) call Castiel (Misha Collins) for help when they investigate a case about several dead police officers who seem to have been killed by the plagues of Egypt. Castiel confirms the staff of Moses was used to kill the cops and tells Sam and Dean that Heaven is in a state of chaos and God's weapons have been stolen. The three head off to find the thief and come face to face with an old enemy.
04. Weekend At Bobby's:
After Bobby (Jim Beaver) discovers Crowley (Mark Sheppard) has no intentions of returning Bobby's soul, the hunter takes matters into his own hands. He calls on Sam (Jared Padalecki) and Dean (Jensen Ackles) for help after he unearths one of Crowley's deepest secrets. Meanwhile, Sam and Dean learn what Bobby does all day when they are not around.
05. You Can't Handle The Truth:
Sam (Jared Padalecki) and Dean (Jensen Ackles) investigate a series of suicides and discover the victims were being told brutal truths that drove them crazy. They find out someone is invoking the Goddess of Truth, Veritas, forcing people to be cruelly honest against their will and Dean is the next victim. Dean is forced to tell Sam the truth about how he feels about his return from Hell.
06. Live Free Or Twi-Hard:
After a group of young girls go missing, Sam (Jared Padalecki) and Dean (Jensen Ackles) realize that a group of vampires have taken up residence in the small town. After a fight with two of the blood-suckers, Dean is bitten and turns into a vampire. Samuel (guest star Mitch Pileggi) tells Dean he can change him back but he'd have to get the blood of the vampire who turned him. Dean infiltrates the nest and runs into the Alpha.
07. Family Matters:
Dean (Jensen Ackles) becomes suspicious of Samuel's (guest star Mitch Pileggi) motives, but Sam isn't sold on the idea that their grandfather is doing anything wrong. The brothers go along on a hunt with Samuel and the other Campbells, but things go terribly awry.
08. All Dogs Go To Heaven:
Dean (Jensen Ackles) and Sam (Jared Padalecki) investigate what seems to be a werewolf killing but turns out to be a skinwalker (guest star Andrew Rothenberg) posing as a family dog who is taking revenge on his owner's enemies. After capturing the dog, he turns human and tells Sam and Dean that an Alpha skinwalker has created many sleeper cells that will rise on his command and kill their families. The only way to stop the mass murders is to find and kill the Alpha.
09. Clap Your Hands If You Believe:
While Sam (Jared Padalecki) and Dean (Jensen Ackles) are investigating a UFO sighting, Dean is abducted from a crop circle. However, when he awakens, he discovers he isn't dealing with aliens, but fairies! Unfortunately, only Dean can see the fairy that keeps attacking him which makes tracing and stopping them difficult. The brothers become even more perplexed when Sam's investigation leads them to a world full of elves, gnomes and a leprechaun.
10. Caged Heat:
Meg kidnaps Sam and Dean and tries to force them to tell her where Crowley is hiding. Sam makes her a deal – they will help her find Crowley if she promises to torture him for information about how to get Sam's soul back. Castiel joins the fight but finds it difficult to work with Meg.
11. Appointment In Samarra:
Dean seeks out Death to help get Sam's soul back. Death tells Dean he will help Sam if Dean will agree to act as Death for 24 hours. Meanwhile, Sam decides he doesn't want his soul back and asks Balthazar for a protective spell to keep his soul out of his body. Balthazar tells Sam he needs the blood of his father for the spell to work and since John Winchester is dead, Sam decides Bobby is the next best thing.
12. Like A Virgin:
Dean and Bobby anxiously wait for Sam to wake up to see if Death was able to restore his soul without causing Sam to lose his mind. Meanwhile, Dean and Bobby investigate a disappearance of virgins and discover dragons are behind the kidnappings. Bobby sends Dean to a doctor who owns the only weapon in the world that can slay a dragon, but Dean must prove himself worthy enough to take it.
Sam starts to have flashbacks to a case he worked on with Samuel before he reconnected with Dean. Sam receives a mysterious text with coordinates to a small town, so the brothers decide to investigate. Dean is surprised when the townspeople start telling him some of the things Sam did while he lived there.
14. Mannequin 3: Reckoning:
Ben calls Dean and tells him Lisa is in trouble. Dean leaves Sam to investigate a case alone and rushes home to rescue Lisa, however, he's not prepared for what meets him at the door.
Meanwhile, Sam discovers the men that were murdered were all a part of a cruel practical joke played on a female co-worker who went missing.
15. The French Mistake:
SAM AND DEAN ARE TRANSPORTED TO AN ALTERNATE REALITY - Raphael (guest star Lanette Ware) launches an attack on Castiel (Misha Collins) and his allies, sending a particularly frightening angelic hitman (guest star Carlos Sanz) after Balthazar (guest star Sebastian Roche), Sam (Jared Padalecki) and Dean (Jensen Ackles). In an effort to protect the brothers, Balthazar sends them to an alternate universe where they are the stars of a TV show called "Supernatural" and they are actors named "Jensen Ackles" and "Jared Padalecki." The brothers are confused when Castiel appears to be a tweet-happy actor named Misha Collins and Sam is married to Ruby (Genevieve Cortese).
16. ...And Then There Were None:
Sam, Dean and Bobby set out in search of The Mother of All's latest monster. While investigating, they run into Samuel and Gwen, who are also hunting the creature. Samuel and Bobby get into a heated fight about how to handle the case.
While searching for a way to defeat Eve, Dean stumbles upon Samuel Colt's journal in the Campbell library. Realizing Samuel might have the answer to their problems, Sam and Dean ask Castiel to send them back in time so they can meet the man himself. While Sam is a bit reluctant to time travel, Dean is beside himself with excitement to return to the Wild, Wild West.
18. My Heart Will Go On:
After Balthazar changes history and keeps the Titanic from sinking, Fate intervenes and begins killing those that would have died on the ship. Castiel tells Sam and Dean that Fate is very upset with the two of them and the only way they can stay alive is to kill her.