Since the hydrogenerator plan was a bust, perhaps they're working on coming up with a new alternative to keep their people alive through the nuclear meltdown.
So are Sam and Dean trapped in a cell, or are they releasing someone from the prison? Is it Metatron? Another angel? A demon? Either way, it looks like serious business for the Winchesters.
On A Discovery of Witches Season 3 Episode 4, Struggling to pin down T.J. Weston, Diana, Phoebe, and Sarah seek help from other witches; Benjamin has a proposition for Satu; Matthew finally returns home.