Did Billie's assistance prove to be the key to cracking one of the craziest cases yet?
That was revealed on Supernatural Season 13 Episode 5 when it became apparent that the ghost of a demented doctor was causing a whole lot of trouble for a select group of people.
Meanwhile, the brothers were shocked to the core when Castiel found his way back to them.
What did he have to say for himself?
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Paul Dailly is the Associate Editor for TV Fanatic. Follow him on Twitter.