S8, E15: Dean really doesn't like witches! A police officer (guest star Christian Campbell), who turned to witchcraft after working a casewith Sam and Dean, is plagued by nightmares in which he murders innocent people. However, when the murders actually happen, Sam andDean are called in by the witch's "familiar" (guest star Mishael Morgan) to help – but the brothers aren't sure they want to save awitch.