Wikipedia
"Sanguinarium" is the sixth episode of the fourth season of the American science fiction television series The X-Files. "Sanguinarium" was written by newcomers Vivian and Valerie Mayhew and directed by Kim Manners, and is a "Monster-of-the-Week" story, a stand-alone plot which is unconnected to the series' wider mythology. It first aired in the United States on November 10, 1996 on the Fox network, earning a Nielsen rating of 11.1 and being seen by 19.85 million viewers upon its initial broadcast.
The show centers on FBI special agents Fox Mulder ( David Duchovny) and Dana Scully ( Gillian Anderson) who work on cases linked to the paranormal, called X-Files. In "Sanguinarium", bizarre murders in a hospital's plastic surgery unit lead Mulder and Scully to suspect a supernatural force may be responsible. As the uncontrolled killings continue, Mulder discovers a link between the victims' dates of birth and key dates on the witchcraft calendar.
The episode started as a spec script written by two fans of the series. It features several references to real life witchcraft sources. "Sanguinarium" received mixed reviews from critics; negative criticism was given to the number of inconsistencies in the plot. The episode's use of gore also drew a mixed reaction; some critics felt that the gore helped, while others felt that "Sanguinarium" relied too heavily on it to cover up weaknesses in its storyline.