[s13e20] Unfinished: Business

"Unfinished Business" (Season 13, Episode 20), directed by Richard Speight Jr. and aired on April 26, 2018, follows Gabriel as he enlists Sam and Dean to help exact revenge on the Norse demigods who betrayed him. The episode highlights Gabriel's confrontation with the real Loki and his subsequent decision to join the Winchesters, while simultaneously featuring Jack's reckless actions in Apocalypse World. Read a detailed fan discussion of this episode on Reddit .