High Quality Content by WIKIPEDIA articles! "Sanguinarium" is the sixth episode of the fourth season of the American science fiction television series The X-Files. It was written by Vivian and Valerie Mayhew and directed by Kim Manners. The episode aired in the United States on November 10, 1996 on the Fox network. The episode is a "Monster-of-the-Week" story, a stand-alone plot which is unconnected to the series` wider mythology. This episode earned a Nielsen rating of 11.1 and was seen by 19.85 million viewers upon its initial broadcast.