Thomas Arthur Croydon (more simply known as Tom Croydon) is a fictional character in the long-running Australian television police drama Blue Heelers.
 He is one of two characters to appear in all thirteen seasons, 1994 to 2006, and is the only character to appear in 510 of the show's episodes.
 We see him in the first few seasons as the Sergeant of Mount Thomas Police Station, who later is promoted to Senior Sergeant at the start he is one of the best people you'll ever meet until a series of complications happen.
 Tom is played by actor John Wood.
Peter Paul Fix (March 13, 1901 – October 14, 1983) was an American film and television character actor, best known for his work in Westerns.
 Fix appeared in more than a hundred movies and dozens of television shows over a 56-year career spanning from 1925 to 1981.
 Fix was best known for portraying Marshal Micah Torrance, opposite Chuck Connors's character in "The Rifleman" from 1958–1963.
 Fix later appeared with Chuck Connors in the 1966 western film "Ride Beyond Vengeance".
Tammy Barr is an American actress, model and voice over talent.
 She is best known for portraying the character young Patty Williams in flashback scenes on "The Young and the Restless" .
 She made her screen debut in "Richard III" alongside David Carradine and also played the wife of Mark Cuban in his sketch spoof "The Cubans".
 Her first leading role in a film was opposite Lorenzo Lamas in the thriller "Backstabber".
 She played the wife of Daniel Baldwin in "A Little Christmas Business" and was a Looping Artist on the Terrence Malick film, "Red Wing".
Demetra Lisa Ann Hampton (born June 15, 1968) is an American actress and model.
 She is best known for portraying the character of Valentina in the eponymous Italian television series.
 Born in Philadelphia, Pennsylvania, she first began her career as a model in New York City, before being chosen for the character and moving to Italy.
 She went on to appear in films such as "Three Columns in the News" (1990), "Kreola" (1993), "National Lampoon's Last Resort" (1994) and "Chicken Park" (1994).
 In 2001, after working on the film, "Gabriel", Hampton went on a hiatus from acting until 2012 when she appeared in the Italian comedy, "Good as You".
Chris McCarrell (born January 9, 1991) is an American theater and television actor.
 He is best known for portraying Marius Pontmercy in the Broadway revival of "Les Misérables," and for portraying the titular character in "" in its Off-Broadway premiere.
Gabriel Sunday (born October 18, 1985) is an American actor and director, best known for portraying Archibald Holden Buster Williams in the teen comedy-drama film Archie's Final Project, and for directing and starring in the Daniel Johnston short film 'Hi How Are You Daniel Johnston', as '1983 Daniel Johnston' alongside his modern day, real life counterpart.
Assing "Aki" Aleong (born December 19, 1934) is a Trinidad and Tobago-born American character actor and singer who has also been active in songwriting and musical production.
 His first important role was in the 1957 movie "No Down Payment", which starred Joanne Woodward and Jeffrey Hunter.
 He is probably best known for portraying Senator Hidoshi during the first season of "Babylon 5", as well as portraying Mr. Chiang, the aide to Nathan Bates in the weekly series of "V: The Series".
 He also portrayed the character of Colonel Mitamura in "Farewell to the King".
 He owned the Gingham Dog fast food restaurant in Hollywood, California, c. 1965.
Colossus is a fictional superhero appearing in American comic books published by Marvel Comics.
 He is the alter ego of Pyotr "Peter" Nikolayevich Rasputin (Russian: Пётр Николаевич Распутин).
 Created by writer Len Wein and illustrator Dave Cockrum, he first appeared in "Giant-Size X-Men" #1 (May 1975).
Daniel Cudmore (born January 20, 1981) is a Canadian actor and stuntman.
 He is perhaps best known for his roles as the mutant Piotr Rasputin / Colossus in the "X-Men" film franchise, and as the Volturi Felix in the "Twilight Saga" films.
Lydia Susanna Hunter (born April 2, 1945), better known by her stage name Linda Hunt, is an American film, stage, and television actress.
 After making her film debut playing Mrs. Oxheart in "Popeye" (1980), Hunt's breakthrough came playing the male character Billy Kwan in "The Year of Living Dangerously" (1982), for which she won the Academy Award for Best Supporting Actress, becoming the first person to win an Oscar portraying a character of the opposite sex.

Question: In what year did the character for which Daniel Cudmore is best known for portraying first appear?
Answer: 1975