Question: The character John Clifford from "When a Stranger Calls Back" made how many appearances in movies, television shows and plays?

Context articles: John Clifford (choreographer)
When a Killer Calls
The babysitter and the man upstairs
When a Stranger Calls (1979 film)
When a Stranger Calls Back
Katie Cassidy
When a Stranger Calls (2006 film)
John Clifford, 9th Baron Clifford
Henry Clifford (opera)
Charles Durning

John Clifford, born June 12th is the founder / artistic director of the original Los Angeles Ballet (1974–1985), and the chamber sized touring ensemble, Ballet of Los Angeles (1988–1991) and the creator of “CASABLANCA, THE DANCE” produced by Warner Bros.
 Theatre Ventures, Inc. (which premiered in Beijing, China at the historic "Great Hall of the People" in 2005) and his Los Angeles Dance Theater.
 Before that time,Clifford was a principal dancer and choreographer with George Balanchine’s New York City Ballet, (1966–1974) and guest artist from 1974–1980, and was widely considered to be Balanchine’s protégé (Saturday Review).
 He choreographed his first (of 8) ballets for the NYC Ballet under Balanchine at age 20 thus making him the 2nd youngest choreographer in history ever to be attached to a major company.
 The first was Balanchine himself who was 20 yrs-old when he choreographed his first ballet for Serge Diaghilev's "Ballets Russes."
 During his time with Balanchine, in his early 20's, he also was a guest choreographer with co's ranging from the San Francisco Ballet, to the Royal Winnipeg Ballet, to the Deutsche Oper Ballet in Berlin.
 Clifford's works were also featured in many TV shows and movies, such as "Flashdance," "The Man Who Loved Women," and TV series such as "Dynasty," "Glitter," and other shows produced by Blake Edwards and Aaron Spelling.
When a Killer Calls is a 2006 direct-to-DVD horror film distributed by B movie company The Asylum.
 The film was released in February 2006, to coincide with the theatrical release of the 2006 remake of "When a Stranger Calls", as both movies have near-identical plots.
The babysitter and the killer upstairs — also known as the babysitter or the sitter — is an urban legend that dates back to the 1960s about a teenage girl babysitting children who receives telephone calls from a man who continually asks her to "check the children".
 The basic storyline has been adapted a number of times, including in "Foster's Release" (1971), "O Anjo da Noite" (1974), "The Sitter" (1977), "When a Stranger Calls" (1979), "When a Stranger Calls Back" (1993), "When a Stranger Calls" (2006) and "Amusement" (2008).
 ("The Sitter", "When a Stranger Calls", and "When a Stranger Calls Back" are all the work of director Fred Walton.)
When a Stranger Calls is a 1979 American psychological horror film.
 It was directed by Fred Walton and stars Carol Kane and Charles Durning.
 The film derives its story from the classic folk legend of "The Babysitter and the Man Upstairs" and the 1974 horror classic "Black Christmas".
 The film was commercially successful, grossing $21,411,158 at the box office, though it received a mixed critical reception.
 It was followed by the 1993 made-for-television sequel "When a Stranger Calls Back" and a remake in 2006.
When a Stranger Calls Back is a 1993 American made-for-television psychological horror film and a sequel to the 1979 classic "When a Stranger Calls" which reunites stars Carol Kane and Charles Durning (reprising their roles as Jill Johnson and John Clifford, respectively) with director Fred Walton from the original film.
 "When a Stranger Calls Back" was originally broadcast on Showtime on April 4, 1993.
Katherine Evelyn Anita Cassidy (born November 25, 1986) is an American actress.
 After initially appearing in minor television roles, she made her film debut in "When a Stranger Calls" (2006).
 During the same year, she also had her first starring role as Kelli Presley in "Black Christmas" (2006).
 In 2007, Cassidy gained attention for her role as Ruby on the supernatural-horror television series "Supernatural", during its third season.
 She later had a supporting role in "Taken".
 In 2009, Cassidy became a cast member of the series "Harper's Island" and "Melrose Place", both of which lasted for only one season.
 During 2010, she had a supporting role as Kris Fowles in "A Nightmare on Elm Street" and a recurring role during the fourth season of "Gossip Girl".
When a Stranger Calls is a 2006 American horror film directed by Simon West and written by Jake Wade Wall.
 The film stars Camilla Belle, Brian Geraghty, Katie Cassidy and Clark Gregg.
 Camilla Belle plays a babysitter who starts to receive threatening phone calls from an unidentified stranger, played by both Tommy Flanagan and Lance Henriksen.
 The film is a remake of Fred Walton's 1979 horror film of the same name which became a cult classic for its legendary opening 20 minutes which this remake extended to a feature length film.
John Clifford, 9th Baron Clifford, (8 April 1435 – 28 March 1461), was a Lancastrian military leader during the Wars of the Roses.
 The Clifford family were one of the most prominent families among the northern English nobility of the fifteenth century; and by the marriages of his sisters John Clifford had links to some very important families of the time, including the earls of Devon.
 He was orphaned at about twenty years of age when his father was slain at the first battle of the Wars of the Roses, the Battle of St Albans in 1455.
 It was probably as a result of his father's death there that John became one of the strongest supporters of Queen Margaret of Anjou, consort of King Henry VI, who ended up as effective leader of the Lancastrian faction.
 John Clifford had already achieved prominence in the north where, as an ally of the son of the earl of Northumberland, he took part in a feud against the Neville family, the Percy's natural rivals in Yorkshire.
 This consisted of a series of armed raids, assaults and skirmishes, and included an ambush on one of the younger Nevilles' wedding party in 1453.
 Historians have seen a direct connection between his involvement in the local feud in the north with the Nevilles, and his involvement in the national struggle against the duke of York, whom the Nevilles were closely allied with in the late 1450s.
 Although this was supposedly a period of temporary peace between the factions, Clifford and his allies appear to have made numerous attempts to ambush the Neville and Yorkist lords.
Henry Clifford is a grand opera in three acts composed by Isaac Albéniz to an English libretto written by Francis Money-Coutts (under the pseudonym "Mountjoy").
 It premiered at the Gran Teatro del Liceo on 8 May 1895.
 The opera is based on historical figures and events and is set in 15th century England during the Wars of the Roses, fought between the rival houses of Lancaster and York.
 The title character, Henry Clifford, 10th Baron de Clifford, was the only son of John Clifford, a Lancastrian commander killed in the bloodiest battle of the war, the Battle of Towton, on 29 March 1461.
 Henry Clifford himself was one of the chief commanders in the Battle of Flodden against the Scots in 1513.
Charles Edward Durning (February 28, 1923 – December 24, 2012) was an American actor, with appearances in over 200 movies, television shows and plays.
 Durning's best-known roles included "The Sting" (1973) and "Dog Day Afternoon" (1975), along with the comedies "The Best Little Whorehouse in Texas" (1982), "Tootsie" (1982), and "To Be or Not to Be" (1983).