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Last season, the Winchesters were reunited with their resurrected mother, Mary, who joined forces with the British Men of Letters. But things turned from bad to worse, with the return of Lucifer and the surprising revelation that the Devil was expecting a child with a human mother. In Season Thirteen, Sam and Dean find themselves facing Lucifer’s offspring, a creature of almost unimaginable power - one that could save the world... or destroy it.