What decision did the brothers make that changed their lives forever?
That was revealed on Supernatural Season 13 Episode 23 when Sam and Dean's loyalty to each other was put to the test as it emerged that they had a big decision ahead of them.
Meanwhile, as Lucifer and Rowena continued to get closer to each other, it emerged that there was another way they could win the war.
Also, a face from the past returned.
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Paul Dailly is the Associate Editor for TV Fanatic. Follow him on Twitter.