Watch Your Back, Mother

Sam, Dean, Castiel, and Gabriel have enough problems as it is. But when a young woman with strange abilities shows up on their doorstep and warns them about a mysterious villain that refers to herself as "Mother", the Winchesters are faced with a choice: Hunt... or BE hunted.
Follow the Winchesters' journey as they face danger, death, the unknown... and the loss of of one of their own.