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3.01 - The magnificient seven
Bracing themselves for the possibility of an apocalyptic war, Sam and Dean realize they have an enormous task of hunting down the hundreds of demons that escaped from the Devil's Gate. With only a year left to live, Dean decides to live life to the fullest and exhibits a carefree attitude that troubles Sam, who is trying to find a loophole in the deal. Bobby tells the brothers about a sighting in Nebraska that turns out to be seven demons that are the actual manifestations of the Seven Deadly Sins.

3.02 - The kids are alright
Dean pressures Sam into visiting Cicero, Indiana, so he can visit an old flame named Lisa, he had a tryst nine years ago. However, Dean is stunned when he meets not only Lisa again, but also her 8-year old son Ben, who bears a striking resemblance to him. However, Ben soon goes missing and Sam and Dean discover that a Changeling, a demonic parasite, is snatching kids from the small town and assuming their form. Meanwhile, Ruby makes contact with Sam and reveals some startling information about his mom.

3.03 - Bad day at black rock
Sam and Dean answer a call on their dad's old cell phone, alerting them someone has broken into John's secret storage room in New York. They discover a cursed rabbit's foot has been stolen and call Bobby for help. He advises them to beware of the foot because anyone who touches it will receive an extreme amount of good luck, but once the foot is lost that person will die. Unfortunately, Sam has already handled the foot, which causes an overjoyed Dean to buy lottery tickets, but a female thief steals it from Sam causing his luck to plummet and putting his life in danger.

3.04 - Sin City
Sam and Dean investigate a rash of violent deaths in Elizabethville, Ohio, a once-sleepy town that has been turned into a haven for gamblers and drinkers. Dean discovers demons have infiltrated Elizabethville and are using their powers of persuasion to make the townspeople succumb to their basic instincts. Meanwhile, Ruby helps Bobby rebuild the Colt from scratch and stuns him with some news.

3.05 - Bedtime stories
Sam and Dean investigate a small town that has been plagued by a number of strange murders that resemble fairy tales, such as Little Red Riding Hood, Snow White and Hansel and Gretel. Meanwhile, Sam summons the Crossroad Demon and threatens to kill her with the newly rebuilt Colt unless she releases Dean from his deal.

3.06 - Red sky at morning
Sam and Dean investigate the mysterious demise of drowned victims who were nowhere near the water at the time of their death. The brothers learn each of the victims saw a ghost ship shortly before they died. Upon investigation, they cross paths with Bela, who is being paid handsomely by one of the murder victim's family members to solve the case. Sam and Dean warn her to stay out of their way, but she has other plans.

3.07 - Fresh blood
Sam and Dean capture a female vampire named Lucy who claims to have no knowledge of how she became a vampire. The guys discover Dixon, a male vampire, is giving out human blood to unsuspecting females in bars, offering it up as the latest drug and turning them all into vampires. Meanwhile, Gordon escapes from jail and goes after Sam. However, Dixon intercepts Gordon and turns him into a vampire, which makes Gordon more powerful than before and a much bigger threat to Sam.

3.08 - A very Supernatural Christmas
It's Christmas time and Sam and Dean investigate a series of murders where the victims were pulled up through the chimney. Sam realizes they are dealing with a sort of Anti-Santa, a demon with roots in pagan lore. Dean wants to celebrate Christmas the old fashioned way as this is his last, but Sam refuses, not wanting to accept that Dean won't be around next year. Sam flashes back to a certain Christmas when he waited for his father to come home to give him a special gift.

3.09 - Malleous maleficarum
Sam and Dean travel to Sturbridge, Massachusetts, and discover a coven of witches that has killed two people. Ruby warns the brothers to stay away; the demon that controls the witches is very powerful, and Ruby fears the demon will try to kill them. Ignoring her plea, Sam and Dean go in after the coven and confront the head witch, who reveals Ruby's past.

3.10 - Dream a little dream of me
Sam and Dean race to Bobby's side after he lapses into a coma and can't be awakened. While unconscious, Bobby battles his personal demons and the reason he became a hunter is revealed. Sam and Dean discover someone poisoned Bobby with a potion that will kill him if he doesn't wake soon. When the brothers decide to take the potion themselves to enter Bobby's dream in order to save him, they come face to face with their own personal nightmares.

3.11 - Mystery spot
Sam and Dean investigate the disappearance of a man who went missing at a tourist location. While searching the site, Dean is shot and killed by the owner. Sam is devastated but stunned when he wakes up the next morning to find Dean alive and well. As the day unfolds, Sam realizes he is re-living the previous day and tries to prevent Dean's death, but to no avail. Dean dies again and Sam must learn to live life without his brother by his side.

3.12 - Jus in Bello
FBI Agent Henricksen finally captures Sam and Dean, but is caught in the middle when a horde of demons descends on the small-town jail to eliminate the brothers.

3.13 - Ghostfacers
Whilst investigating the haunted Morton Mansion, Sam and Dean run into a couple of familiar faces and become inadvertent participants in a new reality show named Ghostfacers. As events turn deadly and the team are trapped in the house, the investigation becomes a battle to survive until morning.

3.14 - Long-distance call
The town of Milan, Ohio, is plagued by a series of calls where the victims are contacted by dead loved ones, and urged to commit suicide. When Dean and Sam investigate, Dean gets a call of his own and the two brothers are soon at odds.

3.15 - Time is on my side
Sam and Dean discover a doctor who, back in 1816, became obsessed with finding the secret of eternal life by taking people's vital organs. Meanwhile, Bobby finds Bela and Dean leaves Sam to confront her.

3.16 - No rest for the wicked
Sam, Dean, and Bobby hunt down Lilith and fight her and her demons in a final effort to save Dean's life.