Question: Cowboy Up stars the actor best known for which role on the series "24"?

Context paragraphs:
Robert La Tourneaux: Robert La Tourneaux (November 22, 1941 – June 3, 1986) was an American actor best known for his role of Cowboy, the good-natured but dim hustler hired as a birthday present for a gay man, in the original Off-Broadway production and 1970 film version of "The Boys in the Band".

Fred Leedon Scott: Fred Leedom Scott (February 14, 1902 - December 16, 1991) was an American actor best known as a singing cowboy star in Westerns during the 1930s and 1940s.

Raymond Francis: Raymond Francis (6 October 1911 – 24 October 1987) was an English actor best known for his role as Detective Chief Superintendent Tom Lockhart in the Associated-Rediffusion detective series "Murder Bag", "Crime Sheet" and "No Hiding Place".  He played the role of Lockhart in these series from 1956 to 1967, and the character was one of the first recurring television detectives.

Charles Parnell (actor): Charles Parnell is an American actor best known for being the second actor to portray Police Chief Derek Frye on "All My Children".  Parnell took over the role previously played by actor William Christian.  He joined the cast of the show on September 8, 2005, and made his final appearance on September 24, 2007.  Parnell also provides the voice of Jefferson Twilight on Cartoon Network's "The Venture Bros." He is currently playing the role of Master Chief Russ Jeter on the TNT show "The Last Ship", which has been renewed for season 4.

Joshua Gomez: Joshua Eli Gomez (born November 20, 1975) is an American actor best known for his role as Morgan Grimes on "Chuck".  He is the younger brother of actor Rick Gomez.  Gomez appeared in a recurring role in the CBS series "Without a Trace" as computer tech James Mackeroy.  He appeared in a series of IBM commercials, a series of Wendy's commercials (Ranch Tooth), and a commercial for Garmin.  He also made a cameo on "Freddy's Nightmares".  He played Sammy Stinger in "Bring It On Again", 2004.

Sherman Hemsley: Sherman Alexander Hemsley (February 1, 1938 – July 24, 2012) was an American comic actor best known for his role as George Jefferson on the CBS television series "All in the Family" and "The Jeffersons", Deacon Ernest Frye on the NBC series "Amen" and B.P. Richfield on the ABC series "Dinosaurs".  For his work on "The Jeffersons", Hemsley was nominated for a Golden Globe Award and an Emmy Award.  He won a NAACP Image Award.

Benjamin Ayres: Benjamin James Ayres (born January 19, 1977) is an actor best known for his role as Dr. Zach Miller of the CTV series Saving Hope.  He also recurred on the Gemini Award–winning HBO Canada series Less Than Kind for which he has nominated for a Canadian Screen Award.  His first series regular role was Casper Jesperson (aka "Cancer Cowboy"), the chain-smoking sex addict who is morbidly obsessed with death, in the critically acclaimed cult hit CBC Television series jPod, based on the Douglas Coupland novel of the same title.

Kiefer Sutherland: Kiefer William Frederick Dempsey George Rufus Sutherland (born 21 December 1966) is a British-Canadian actor, producer, director, and singer-songwriter.  He is best known for his portrayal of Jack Bauer on the Fox drama series "24" (2001–2010, 2014), for which he earned an Emmy Award, a Golden Globe Award, two Screen Actors Guild Awards and two Satellite Awards.

Vinod Kovoor: Vinod Kovoor is an Indian film actor best known for his work in Malayalam cinema.  He got fame with his role Moidu in the popular comedy show "Marimayam" broadcast by Mazhavil Manorama, which conveys a real picture of public offices in Kerala.  He is also known for his role as "Moosakka" in "M80 Moosa", a serial in Media one channel.  He has written books on his favorite realm mimicry and mono-act.  His first book "Ekabhinaya Samaharam" has 25 scripts, and most of it deals with social issues and his second book "Kalolsavam Monoact" was also released.  He got Best actor Award for the short film "Athe Karanathal" from the National Film Festival.  He was best actor for consecutively four years in Kerala Kalolsavam.  He won best Excellency award by Rotary, J.C.I.  He also received Best Television Anchor Award by K.C.L, Best Comedy artist Award by Kerala Hasyavedi, Kazhcha Award and Best child artist award for the drama "Chandrolsavam" in Kambissery Nadakolsavam . His achayan role in the super hit short film "Nerariyathe" critically acclaimed.

Cowboy Up: Cowboy Up (also known as Ring of Fire) is a 2001 film directed by Xavier Koller.  It stars Kiefer Sutherland, Marcus Thomas, Molly Ringwald, and Daryl Hannah.  It won the Crystal Heart Award at the 2001 Heartland Film Festival.

Supporting paragraphs: Cowboy Up Kiefer Sutherland
Answer: Jack Bauer