Booze Traveler (2014)

S8E15 Man's Best Friend with Benefits

Officer James, who embraced witchcraft after collaborating with Sam and Dean on a case, finds himself tormented by horrific dreams in which he commits acts of murder against unsuspecting victims. As these nightmares intensify, he struggles to discern reality from the dark visions that haunt him, leading him to seek help from Sam and Dean once again. Together, they must unravel the source of his nightmares and confront the dangers that come with dabbling in magic.