Sam devises a way to stop Lucifer's baby. Dean is furious when he discovers that someone stole the colt. Kelly makes a bold choice about the baby's future.
When Sam and Dean investigate the case of a missing person, the lead witness says the victim was attacked by a man with the head of a goat.
Sam and Dean get a lead on the whereabouts of Kelly Kline. Mick makes a surprise visit to the bunker and decides to join the hunt.
Sam and Dean run into Claire Novak while searching for a werewolf with Mick Davies. When Claire gets bitten, the brothers race to find a way to save her before she turns.
Sam and Dean investigate the mysterious circumstances of an attack by an invisible hellhound at a campsite. Two of Crowley's own personal demons uncover what he has been hiding.
A chance to take out a nest of vampires backfires when the alpha-vamp shows up and turns the tables on Mary and the British Men of Letters who are trying to recruit Sam and Dean.
When Sam and Dean look into a murder at a museum, they learn a ghost from a merchant ship that sunk in 1723 may be at the heart of the mystery.
When Mary asks Sam, Dean and Castiel for help with a case, she fails to mention that the British Men of Letters are involved.
Sam enlists Rowena's help to track down an old world, powerful family of witches after Dean gets hit by a spell that is rapidly erasing his memory.
Lily Sunder steeps herself in black magic, honing her powers for over a century, waiting to exact revenge on a band of angels that murdered her family. Sam and Dean must work quickly to stop Castiel from becoming her next victim.
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