Sam enlists everyone's help in trying to track down Dean; Castiel meets up with an unreliable source; Jack adjusts to life as a human.
Sam finds a clue to Dean's whereabouts; Castiel imparts some sage advice to Jack, who, still desperate to belong, looks for a familial connection.
Still trying to solve the mystery of what happened to Dean, Sam enlists the help of Sheriff Jody Mills; Castiel continues to be a father figure to Jack.
Dean continues to struggle; Sam must think fast when action figures come to life, and the heroes find themselves living in a real-life horror movie.
After a hunt gone wrong leaves Maggie's whereabouts unknown, Sam and Dean race to find her, but what they find are their own worst nightmares.
Sam and Charlie team up to get to the bottom of a string of random disappearances; Jack believes that he has found a case and convinces Dean to partner with him on the hunt.
Sam and Castiel track down a shaman who may be able to help a friend; Nick continues to spiral down a dark path as he looks for answers surrounding the deaths of his wife and son; Jack turns to Dean for help enjoying the human experience.
When Sam and Dean join forces with an unexpected ally, the outcome alters the course of two lives; Heaven faces an attack from a dark force, driving Castiel to make an enormous sacrifice to make things right.
Sam and Dean enlist the help of their pal Garth to gain inside information on what Michael may be planning; the brothers split up to each go after weapons that can aid in their fight against the Archangel.
Michael retakes control of Dean as his army of monsters continue to move in; Sam devises a plan to reach Dean and stop Michael before anyone else dies.
Dean spends time bonding with Mary and Donna; Nick finally finds the answer he was looking for; Sam is faced with an impossible choice.
Sam and Dean must figure out how to stop the bloodshed when Donatello is inadvertently scrambling the order of future prophets; Nick comes face to face with his past.
Sam and Dean look to occult lore for a solution to their latest problem, but instead of a resolution, they find much more than either of them had anticipated.
Sam and Dean enlist the help of Rowena to track down a demi-god who feasts on human flesh; the challenge of keeping Michael at bay is proving to be more difficult than originally anticipated.
Sam and Castiel follow a case to a picturesque little town in Arkansas, only to find out nothing is as idyllic as it appears to be; Dean and Jack take a road trip to visit an old friend.
Sam and Dean are baffled when they come up against a monster they have never heard of before; Jack does his best to impress a new group of friends.
Sam and Dean race to help a friend in need; Mary is concerned for Jack's well-being; Castiel enlists help from Jo to track down a miracle.
Sam and Dean continue to worry about the condition of Jack's soul.
Sam, Dean and Castiel investigate a string of suspicious deaths that have a biblical element to them.