Season Final: Lucifer battles Sam, Dean and Castiel for control of his unborn child.
Sam and Dean have only each other to rely on when they're caught in a dangerous situation.
Sam and Dean worry about Mary when they learn hunters are dying in suspicious accidents all over the country.
Alicia Banes calls Mary for help after her mother goes missing. Mary begins to have some doubts about the British Men of Letters.
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.
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