Sam (Jared Padalecki) and Dean (Jensen Ackles) investigate a string of gruesome murders and discover the Egyptian god Osiris (guest star Faran Tahir) is behind the deaths. The vengeful god is putting people on trial for their past mistakes and killing them if found guilty. Osiris hones in on Dean's guilt and decides he's the next to stand trial. Sam steps in as Dean's lawyer, but both brothers are unprepared when Osiris calls an unexpected witness – Jo (guest star Alona Tal). Robert Singer directed the episode written by Adam Glass.