Question: What actor portrayed "Pa" in the Little House on the Prairie tv series?

full_context: Document 1: Charles Ingalls: Charles Phillip Ingalls ( ; January 10, 1836June 8, 1902) was the father of Laura Ingalls Wilder, known for her "Little House" series of books. Ingalls is depicted as the character "Pa" in the books and the television series.
Document 2: Charles Lane (actor): Charles Lane (born Charles Gerstle Levison; January 26, 1905 – July 9, 2007) was an American character actor and centenarian whose career spanned 77 years. Lane gave his last performance at the age of 101 as a narrator in 2006. Lane appeared in many Frank Capra films, including "You Can't Take It With You" (1938), "Mr. Smith Goes to Washington" (1939), "Arsenic and Old Lace" (1944), "It's a Wonderful Life" (1946) and "Riding High" (1950). He was a favored supporting actor of Lucille Ball, who often used him as a no-nonsense authority figure and comedic foe of her scatterbrained TV character on her TV series "I Love Lucy", "The Lucy–Desi Comedy Hour" and "The Lucy Show". His first film of more than 250 was as a hotel clerk in "Smart Money" (1931) starring Edward G. Robinson and James Cagney.
Document 3: Michael Raynor (actor): Michael Raynor, is an American actor, director and writer. His best known roles are as Joseph Morgan in "ER (TV series)", Apollo 15 Astronaut Al Worden in "From the Earth to the Moon", Mick in the movie "A Brother's Kiss" and Frank in the movie "Federal Hill."
Document 4: Little House in the Big Woods: Little House in the Big Woods is an autobiographical children's novel written by Laura Ingalls Wilder and published by Harper in 1932 (reviewed in June). It was Wilder's first book published and it inaugurated her "Little House" series. It is based on memories of her early childhood in the Big Woods near Pepin, Wisconsin, in the early 1870s.
Document 5: Almanzo Wilder: Almanzo James Wilder ( ; February 13, 1857 – October 23, 1949) was the husband of Laura Ingalls Wilder and the father of Rose Wilder Lane, both noted U.S. writers.
Document 6: Laura Ingalls (disambiguation): Laura Ingalls (1867–1957) is the birth name of American writer Laura Ingalls Wilder, author of the "Little House on the Prairie" books.
Document 7: List of Little House on the Prairie books: The original Little House books were a series of eight autobiographical children's novels written by Laura Ingalls Wilder and published by Harper & Brothers from 1932 to 1943. The eighth book, "These Happy Golden Years", featured Laura Ingalls at ages 15 to 18 and was originally published with one page at the end containing the note, "The end of the Little House books." The ninth and last novel written by Ingalls Wilder, "The First Four Years" was published posthumously and unfinished in 1971. Although her intentions are unknown, it is commonly considered part of the Little House series and is included in the 9-volume paperback box set "Little House, Big Adventure" (Harper Trophy, May 1994).
Document 8: A Little House Traveler: A Little House Traveler: Writings from Laura Ingalls Wilder’s Journeys Across America is a collection of early writings by Laura Ingalls Wilder, the author of the Little House series of children's novels. It consists of three parts: "On the Way Home", a diary originally published in 1962; "West from Home", a collection of letters from Wilder to her husband Almanzo Wilder written in 1915 and published in 1974; and "The Road Back", a previously unpublished diary.
Document 9: Michael Lloyd (music producer): Michael Jeffrey Lloyd (born November 3, 1948) is an American record producer, arranger, songwriter and musician. After working with Mike Curb, Kim Fowley and others in the mid and late 1960s on musical projects including the West Coast Pop Art Experimental Band, and Steven Spielberg's first short film, "Amblin'", he became a producer of such teen idol pop stars as The Osmonds, Shaun Cassidy, and Leif Garrett in the 1970s.
Document 10: Hugh O'Brian: Hugh O'Brian (born Hugh Charles Krampe; April 19, 1925 – September 5, 2016) was an American actor and humanitarian, best known for his starring roles in the ABC western television series "The Life and Legend of Wyatt Earp" (1955–1961) and the NBC action television series "Search" (1972–1973), as well as films including the Agatha Christie adaptation "Ten Little Indians" (1965); he also had a notable supporting role in John Wayne's last film, "The Shootist" (1976). He was highly regarded for creating the Hugh O'Brian Youth Leadership Foundation, a non-profit youth leadership development program for high school scholars which has sponsored over 400,000 students since he founded the program in 1958 following an extended visit with Nobel Peace Prize-winning theologian and physician Albert Schweitzer.
Document 11: Little House on the Prairie (TV series): Little House on the Prairie (known as Little House: A New Beginning in its final season) is an American western drama television series, starring Michael Landon, Melissa Gilbert, and Karen Grassle, about a family living on a farm in Walnut Grove, Minnesota, in the 1870s and 1880s. The show is an adaptation of Laura Ingalls Wilder's best-selling series of "Little House" books. Television producer and NBC executive Ed Friendly became aware of the story in the early 1970s. He asked Michael Landon to direct the pilot movie. Landon agreed on the condition that he could also play Charles Ingalls.
Document 12: Laura Ingalls Wilder House: The Laura Ingalls Wilder House is a historic house museum at 3060 Highway A in Mansfield, Missouri. Also known as Rocky Ridge Farm, it was the home of author Laura Ingalls Wilder from 1896 until her death in 1957. The author of the "Little House on the Prairie" series, Wilder began writing the series while living there. The house, together with the nearby Rock Cottage on the same property, represents one of the few surviving places where she resided. The house is owned by a local non-profit, and is open to the public for tours. It was designated a National Historic Landmark in 1991.
Document 13: Michael Landon: Michael Landon (born Eugene Maurice Orowitz; October 31, 1936 – July 1, 1991) was an American actor, writer, director, and producer. He is known for his roles as Little Joe Cartwright in "Bonanza" (1959–73), Charles Ingalls in "Little House on the Prairie" (1974–83), and Jonathan Smith in "Highway to Heaven" (1984–89). Landon appeared on the cover of "TV Guide" 22 times, second only to Lucille Ball.
Document 14: Laura Ingalls Wilder: Laura Ingalls Wilder ( ; February 7, 1867 – February 10, 1957) was an American writer known for the "Little House on the Prairie" series of children's books released from 1932 to 1943 which were based on her childhood in a settler and pioneer family.
Document 15: Bonanza: Bonanza is an NBC television western series that ran from 1959 to 1973. Lasting 14 seasons and 431 episodes, "Bonanza" is NBC's longest-running western, and ranks overall as the second-longest-running western series on U.S. network television (behind CBS's "Gunsmoke"), and within the top 10 longest-running, live-action American series. The show continues to air in syndication. The show is set around the 1860s and it centers on the wealthy Cartwright family, who live in the area of Virginia City, Nevada, bordering Lake Tahoe. The series stars Lorne Greene, Dan Blocker, Michael Landon, Pernell Roberts (who left after six seasons), and later David Canary and Mitch Vogel. The show is known for presenting moral dilemmas.
ground_truth: Michael Landon