Dean Winchester is dead—or so everyone believes. When Y/N and Sam uncover security footage from a mysterious murder, they make a horrifying discovery: Dean is alive, but he’s no longer human. Now a demon under the influence of the Mark of Cain, Dean has disappeared alongside Crowley, leaving a trail of blood, broken promises, and unanswered questions. As Sam and Y/N race to find him, they’re forced to confront a Dean who remembers everything—but no longer cares about right or wrong. Following the events of Season 10, this story explores what happens when the hunter you’ve always loved becomes the monster you’re sworn to stop.