On Supernatural Season 10 Episode 19, Sam went in search of a magical box built by a former member of the Men of Letters.
He hoped it would cure Dean of the Mark of Cain.
Unsurprisingly, however, this plan did not go smoothly, with a deadly alarm system placing the Winchesters in serious jeopardy.
Looking ahead to Supernatural Season 10 Episode 20, meanwhile, the focus will shift a bit away from the brothers. Come on down, Castiel!
Look for this beloved character to try and help Claire Novak find her mother next Wednesday night, as the latter has been missing for years.
Castiel, of course, feels guilty for what he did to the Novak family and wants to make amends by reuniting Claire with her long-lost parent.
Will he be successful? How far will he go in the name of this mission?
Tune in next week for the answer and relive the latest adventures when you watch Supernatural online via our friends at TV Fanatic.
They make it awfully easy to do so...