Supernatural (2005)

S2E9 Croatoan

In the episode titled "Croatoan," Sam experiences a troubling vision of Dean gunning down an unarmed individual. This leads them to the town of River Grove, where they uncover that the local residents are under the influence of a virus that triggers aggressive behavior. As they delve deeper into the mystery, they must confront the escalating violence and find a way to save the townspeople before it's too late.