Supernatural (2005)

S8E9 Citizen Fang

Sam enlists the help of a hunter named Martin to monitor Benny's activities without Dean's knowledge. When Martin reports a vampire murder, implicating Benny as the culprit, Dean quickly comes to Benny’s defense. Tensions rise as the brothers grapple with the possibility that Benny may be involved in dark deeds, testing their trust and loyalty towards each other and their ally.