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

Context articles: Charles Ingalls
List of Little House on the Prairie books
Nellie Oleson
Little House on the Prairie (miniseries)
Little House on the Prairie (novel)
Little House on the Prairie (musical)
Little House on the Prairie (film)
Little House on the Prairie (TV series)
Laura, the Prairie Girl
Michael Landon

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.
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).
Nellie Oleson is a fictional character in the Little House series of autobiographical children's novels written by Laura Ingalls Wilder.
 She was portrayed by Alison Arngrim in the NBC television show "Little House on the Prairie" (1974 to 1983), where her role is much expanded.
 Three different girls from Laura Ingalls Wilder's childhood; Nellie Owens, Genevieve Masters and Stella Gilbert, were the basis for the fictional Nellie Oleson.
Laura Ingalls Wilder's Little House on the Prairie is a 2005 family western television miniseries directed by David L. Cunningham.
 It is a six-part adaptation of children's novels "Little House in the Big Woods" (1932) and "Little House on the Prairie" (1935) by Laura Ingalls Wilder.
 The series was broadcast on ABC as part of The Wonderful World of Disney anthology series.
Little House on the Prairie is an autobiographical children's novel by Laura Ingalls Wilder, published in 1935.
 It was the third-published one in the "Little House" series but it continues that of the first, "Little House in the Big Woods" (1932), and is not related to the second.
 Thus it is sometimes called the second one in the series, or the second volume of "the Laura Years".
Little House on the Prairie is a book musical adapted from the children's books, Little House on the Prairie, by Laura Ingalls Wilder.
Little House on the Prairie is a 1974 American made-for-television film which served as the pilot to the "Little House on the Prairie" TV series.
 It is closely based on the "Little House on the Prairie" novel; second of the "Little House" series of books by Laura Ingalls Wilder.
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.
Laura, the Prairie Girl (草原の少女ローラ , Sōgen no Shōjo Rōra ) is a Japanese anime television series based on the novels "Little House in the Big Woods" and "Little House on the Prairie" by Laura Ingalls Wilder.
 Twenty-six episodes were released, between 1975 and 1976, each lasting about 30 minutes.
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.