Question: Silent Night, Deadly Night is a 1984 American slasher film directed by Charles E. Sellier, Jr., and starring which American actress and singer best known for her performance in the stage and film versions of "Godspell" in the early 1970s?

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Linnea Quigley: Linnea Barbara Quigley (born May 27, 1958) is an American actress, film producer, model, singer, and author.  She is best known as a B movie actress and is often referred to as a "scream queen" due to her frequent appearances in low-budget horror films during the 1980s and 1990s.  Born in Davenport, Iowa, Quigley first pursued her career in the late 1970s shortly after moving to Los Angeles.  While working at Jack LaLanne's health spa, she was encouraged by her friends to try modeling and also began taking acting and guitar-playing classes.  After appearing as an extra in various films, Quigley got her first acting role in the Charles Band-produced film "Fairy Tales" (1978).  She continued receiving small parts mostly in B movies.  Her first bigger part was in the 1981 slasher film, "Graduation Day".  Quigley followed with more films such as "Savage Streets" (1984) and "Silent Night, Deadly Night" (1984).

Silent Night, Deadly Night Part 2: Silent Night, Deadly Night Part 2 is a 1987 black comedy horror slasher film edited, written and directed by Lee Harry, and co-written by Joseph H. Earle.  It is the sequel to 1984's "Silent Night, Deadly Night" and the second film in the "Silent Night, Deadly Night" franchise.  It was followed by "" in 1989.

Billy Chapman (Silent Night, Deadly Night): Billy Chapman is a fictional character in the "Silent Night, Deadly Night" franchise.  Created by writers Paul Caimi and Michael Hickey, the character serves as the protagonist and antihero of the first film, "Silent Night, Deadly Night" (1984), and is featured in flashbacks in the sequel, "Silent Night, Deadly Night Part 2" (1987).

Silent Night, Deadly Night 3: Better Watch Out!: Silent Night, Deadly Night III: Better Watch Out!  is a 1989 American slasher film written and directed by Monte Hellman.  A direct-to-video release, the film is the second sequel to the 1984 film "Silent Night, Deadly Night" and centers around the Christmas-obsessed killer Ricky Caldwell awakening from a coma and stalking a blind teenager with psychic powers, while she travels to her grandmother's house for the Christmas holiday with her brother and his girlfriend.  The third entry in the "Silent Night, Deadly Night" franchise, it was the last to follow the storyline set by the previous two films, the next two sequels being standalone entries.

Silent Night, Deadly Night: Silent Night, Deadly Night is a 1984 American slasher film directed by Charles E. Sellier, Jr., and starring Robert Brian Wilson, Lilyan Chauvin, Gilmer McCormick, Toni Nero, Linnea Quigley, Britt Leach and Leo Geter.  Set during Christmas, the story concerns a young man, Billy, who suffers from posttraumatic stress over witnessing his parents' Christmas Eve murder and his subsequent upbringing in an abusive Catholic orphanage.  In adulthood, the Christmas holiday leads him into a psychological breakdown, and he emerges as a spree killer donning a Santa suit.

Gilmer McCormick: Gilmer McCormick (born March 13, 1947) is an American actress and singer best known for her performance in the stage and film versions of "Godspell" in the early 1970s and for her role as Sister Margaret in the 1984 horror film "Silent Night, Deadly Night".

Lee Harry: Lee Harry is a director and editor, best known for directing the Christmas horror, Silent Night Deadly Night 2 and "Street Soldiers".  Along with fellow Burbank editor Joseph H. Earle, Harry was tasked to use his editing skills to make "Silent Night, Deadly Night: Part 2" look like a different film than the original, which would then be repackaged as a sequel.  It has since become a cult horror classic.  Harry admits to being pleased by the reception the notoriously inept film's received.

Charles Sellier: Charles Edward Sellier Jr. (November 9, 1943 – January 31, 2011) was an American television producer, screenwriter, novelist and director, best known for creating the American book and television series "The Life and Times of Grizzly Adams".  He was also known for directing the notorious Christmas themed slasher film "Silent Night, Deadly Night" He also wrote and produced more than thirty films and 230 television shows during his career, which spanned four decades.

Silent Night, Deadly Night (franchise): Silent Night, Deadly Night is an American horror franchise consisting of six feature films, action figures, clothing, stockings, Christmas ornaments, and other memorabilia.  The first film in the series, "Silent Night, Deadly Night" (1984), originally titled "Slay Ride", tells the story of Billy, a young man who experiences a psychotic break and goes on a murder spree dressed as Santa Claus.  The film received theatrical distribution from TriStar Pictures, but was pulled from theaters in November 1984 after a series of protests against the film.

Silent Night (2012 film): Silent Night is a 2012 American horror film directed by Steven C. Miller and starring Jaime King, Malcolm McDowell, and Ellen Wong.  It is a loose remake of Charles E. Sellier Jr.'s 1984 film "Silent Night, Deadly Night" but adds new plot points taken from the real life Covina massacre that occurred in 2008.  It is the sixth installment in the "Silent Night, Deadly Night" franchise.  The film was given a limited theatrical release on November 30, 2012 and was released on DVD and Blu-ray Disc on December 4, 2012.

Supporting paragraphs: Silent Night, Deadly Night Gilmer McCormick
Answer: Gilmer McCormick