Supernatural Season 13 Episode 20 – Unfinished Business – Gabriel is back and drags Sam and Dean into his plot for revenge on the demigods who sold him to Asmodeus. Meanwhile, Jack’s inflating confidence leads to reckless decisions that could put others in harm’s way. – Stream Supernatural Season 13 Episode 20 Online for Free – Watch Supernatural Season 13 Full Episode 20 Free – OnionPlus Official