Taking place in Chicago, Illinois (), "Bloodlines" begins with a young cop-to-be named Ennis Ross (Lucien Laviscount — of fame), who watches his almost-fiancé die in front of him after first being ushered into the underground world of monsters.
Eventually, this unlikely pair meets Sam and Dean, who arrive to share with Ennis that monsters are real and learn from David that Chicago is secretly run by them.
The episode ends with the discovery that this "creature" is just a man, one who lost his own son to the monsters controlling the Windy City. David and Violet rekindle their romance as the former rejoins his family in hopes of preventing a war, and Ennis decides to become a hunter, hoping to take back Chicago from the monsters. And then the Winchesters leave, never to return to the city again.
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