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?
Use the video above to watch Supernatural online right here via TV Fanatic. Get caught up on all of the action right now!
Paul Dailly is a staff writer for TV Fanatic. Follow him on Twitter.