The team attempt to destroy Drill once and for all using the knowledge that they've gained. However, if they fail, Drill's retribution will be swift and terrible.
Sam and Dean track down a demon prostitution ring which leads them to the witch Rowena. They go after her, unaware that Cole is still on Dean's trail. Meanwhile, the husband of Hannah's host body comes looking for his wife, complicating things for Hannah and Castiel.moreless
Oliver goes to Corto Maltese to bring Thea home, while Lyla asks Diggle to find a missing ARGUS operative. Meanwhile, Ray gives Felicity her first assignment.
While David Robert Jones goes after his next target, Walter visits the Other Side to help the team's counterparts with an investigation into a Fringe case that touches on both worlds.