Sam and Dean enlist the help of their pal Garth to gain inside information on what Michael may be planning. The brothers split up to each go after weapons that…

Sam, Dean and Castiel investigate a string of suspicious deaths that have a biblical element to them.

While Sam and Dean try to track down Kevin’s mother, Castiel is captured by an old battle-comrade and learns more about the factions of angels.

Hoping to find a weapon powerful enough to defeat Amara, Dean convinces “Castiel,” who is still Lucifer, to send him back in time to 1944 to the fated submarine mission…