In the new episode "Gimme Shelter," Castiel and Jack (Misha Collins, Alexander Calvert) team up to investigate a case that involves the members of a local church. Meanwhile, Sam and Dean (Jared Padalecki, Jensen Ackles) embark on another road trip, a quest to find Amara (recurring guest star Emily Swallow), in the desperate hope that she will give them something they can use in their looming confrontation with her brother, Chuck (guest star Rob Benedict) – aka God.