Before Sam and Dean, there were their parents, John and Mary. This is the untold love story of how they met and put it all on the line to save the entire world.

John and Millie are on different pages about his new interest in hunting and Ada tries to bridge the gap. Mary follows a trail from her father that points to the disappearance of a teenage boy in Topeka. Meanwhile, Carlos has a heart to heart with Mary as Latika dives into her books to identify the monster.

The Hunt heats up and Mary and John find trails that lead back to their fathers. Carlos helps Mary investigate where the Akrida might be hiding but they discover more than they bargained for. Meanwhile, Millie steps in to help Latika, Ada, and John to decipher notes left behind and they stumble upon a way to get some answers.

John receives a message from a mysterious stranger. Meanwhile, Carlos, Latika and Ada work together to find answers, but time is running out. Lastly, Mary and John have a warm but awkward reunion. There is a lot to unpack, but they realize this isn't the time or place.