Supernatural (2005)

S09E20 Bloodlines

Sam and Dean arrive in Chicago to track down a monster responsible for a series of killings. They encounter a young police officer whose girlfriend was a recent victim of the creature. As they delve deeper into the investigation, they discover he is entangled in a power struggle among five formidable monster clans that dominate the city. The brothers must navigate this complex web of supernatural politics while seeking justice for the fallen.