James Arness (May 26, 1923 – June 3, 2011) was an American actor, best known for portraying Marshal Matt Dillon for 20 years in the television series "Gunsmoke".
 Arness has the distinction of having played the role of Dillon in five separate decades: 1955 to 1975 in the weekly series, then in "" (1987) and four more made-for-television "Gunsmoke" films in the 1990s.
 In Europe, Arness reached cult status for his role as Zeb Macahan in the western series "How the West Was Won".
 He was the older brother of actor Peter Graves (1926–2010).
Eric Shea (born February 14, 1960), is an American actor.
 A professional child actor, active from age six through seventeen, he is best known for his roles in the blockbuster feature films "Yours, Mine and Ours" (1968) and "The Poseidon Adventure" (1972), as well as his numerous guest-starring appearances throughout the 1960s and 1970s on such popular television series as "Batman", "Gunsmoke", "The Flying Nun", "Nanny and the Professor", "The Brady Bunch", and "Little House on the Prairie", among others.
Walter Clarence Taylor, III, known as Buck Taylor (born May 13, 1938), is an American actor best known for his role as gunsmith-turned-deputy Newly O'Brien in 174 episodes during the last eight seasons of CBS's "Gunsmoke" television series (1967–1975).
 In recent years, he has painted the portrait of his friend and "Gunsmoke" series' star James Arness.
 Taylor's painting specialty is the American West, and each year, he creates the posters for several Texas rodeos. Taylor lives with his second wife on a ranch near Fort Worth, Texas.
Howard Culver (June 4, 1918 - August 4, 1984) was an American radio and television actor, best known as hotel clerk Howie Uzzell during the entire run of TV's "Gunsmoke".
 On radio he starred in the title role of the Western adventure series "Straight Arrow", which aired on Mutual from May 6, 1948 to June 21, 1951.
Gage Clarke (March 3, 1900 – October 22, 1964) was an American character actor best known for his role as the principal in "Mister Peepers".
 His other work consisted largely of one-shot appearances in television series such as seven major supporting roles as different characters in "Maverick", twelve roles in "Gunsmoke" (Clarke played a key role in the "Maverick" spoof of "Gunsmoke", an episode entitled "Gun-Shy"), "Mister Ed", "Laramie", "Ben Casey", "Checkmate", "The Twilight Zone", "The Real McCoys" (twice), four roles in "Alfred Hitchcock Presents", "Bourbon Street Beat", "Thriller", "Have Gun Will Travel", and many others, as well as movies including "I Want to Live!
", "The Bad Seed", "The Brothers Karamazov", and "The Absent-Minded Professor".
 Clarke, a slightly overweight actor with a double chin, specialized in playing avuncular, rather timid characters, with one of his largest parts being frightened gambler "Foursquare Farley" in the "Maverick" episode "Greenbacks, Unlimited" opposite James Garner and John Dehner.
 He made two guest appearances on "Perry Mason", including the role of Frederick Rollins in "The Case of the Glittering Goldfish" in 1959.
 He also played the part of Mr. Murg in "Pollyanna" in 1960.
Robert C. Totten (February 5, 1937 – January 27, 1995) was an American television director, writer, and actor, best known for his work on the CBS series "Gunsmoke".
 He directed twenty-seven "Gunsmoke" episodes between 1966 and 1971 and guest starred in eight segments between 1967 and 1973.
 He also directed eight episodes of NBC's "Walt Disney's Wonderful World of Color" between 1969 and 1975.
Hank Patterson (born Elmer Calvin Patterson; October 9, 1888 – August 23, 1975) was an American actor and musician.
 He is known foremost for playing two recurring characters on three television series: the stableman Hank Miller on "Gunsmoke" and farmer Fred Ziffel on both "Petticoat Junction" and "Green Acres".
Gunsmoke is an American radio and television Western drama series created by director Norman Macdonnell and writer John Meston.
 The stories take place in and around Dodge City, Kansas, during the settlement of the American West.
 The central character is lawman Marshal Matt Dillon, played by William Conrad on radio and James Arness on television.
 When aired in the UK, the television series was initially titled Gun Law, later reverting to "Gunsmoke".
William Gary Busey ( ; born June 29, 1944) is an American actor of film and television.
 A prolific character actor, Busey has appeared in over 150 films, including "Lethal Weapon" (1987), "Predator 2" (1990), "Point Break" (1991), "Under Siege" (1992), "The Firm" (1993), "Carried Away" (1996), "Black Sheep" (1996), "Lost Highway" (1997), "Fear and Loathing in Las Vegas" (1998), "The Gingerdead Man" (2005) and "Piranha 3DD" (2012).
 Busey also made guest appearances on television shows such as "Gunsmoke", "Walker, Texas Ranger", "Law & Order", "Scrubs", and "Entourage".
Gregg Palmer (born Palmer Edvind Lee; January 25, 1927 – October 31, 2015) was an American actor, known primarily for his work in television westerns.
 He appeared from 1960-1975 in varying roles in twenty episodes of CBS's "Gunsmoke" with James Arness, thirteen segments of the syndicated "Death Valley Days", and nine episodes of NBC's "The Virginian" starring James Drury in the title role.
 He guest starred five times on "Bonanza", NBC's longest-running western.

Question: What is the name of the American Actor who starred in Gunsmoke?
Answer: Gage Clarke