Question: Unidentified Flying Oddball is a 1979 film adaptation of a book by the American writer who also wrote Adventures of Huckleberry Finn which is often called what?
Context: Huckleberry Finn is a surviving American silent dramatic rural film from 1920, based on Mark Twain's classic "Adventures of Huckleberry Finn".  It was produced by Famous Players-Lasky and distributed through Paramount Pictures.  William Desmond Taylor directed "Huckleberry Finn", as he had the 1917 film version of "Tom Sawyer", using a scenario written by Julia Crawford Ivers, who also had been the writer for "Tom Sawyer". Huckleberry Finn (1931) is an American Pre-Code comedy film directed by Norman Taurog and starring Jackie Coogan as Tom Sawyer and Junior Durkin as Huckleberry Finn.  The picture was based upon the novel "The Adventures of Huckleberry Finn" by Mark Twain. The Adventures of Huckleberry Finn is a 1960 American film directed by Michael Curtiz.  Based on the Mark Twain novel of the same name, it was the third sound film version of the story and the second filmed by Metro-Goldwyn-Mayer.  The film was the first adaptation of "Huckleberry Finn" to be filmed in CinemaScope and Technicolor.  It starred Eddie Hodges as Huck and former boxer Archie Moore as the runaway slave, Jim.  Tony Randall also appeared in the film (and received top billing), and Buster Keaton had a bit role in what proved to be his final film for his old studio, Metro-Goldwyn-Mayer.  Neville Brand portrayed Huck's alcoholic father, Pap Finn. Unidentified Flying Oddball (also known as The Spaceman and King Arthur and A Spaceman in King Arthur's Court) is a 1979 film adaptation of Mark Twain's "A Connecticut Yankee in King Arthur's Court", directed by Russ Mayberry and produced by Walt Disney Productions.  Subsequently re-released in the United States under the titles "The Spaceman and King Arthur" and "A Spaceman in King Arthur’s Court", the film starred Dennis Dugan as NASA employee Tom Trimble who unintentionally travels back in time with his look-alike android Hermes.  Trimble’s NASA spacecraft travels faster than the speed of light, landing him and the android near King Arthur’s Camelot, where – with the aid of their 20th-century technology – they must defeat a plot by the evil Sir Mordred and Merlin to oust King Arthur from the throne. The Adventures of Huck Finn is a 1993 American adventure film written and directed by Stephen Sommers, distributed by Walt Disney Studios Motion Pictures and Buena Vista Pictures, and starring Elijah Wood, Courtney B. Vance, Jason Robards and Robbie Coltrane; it is based on Mark Twain's novel "Adventures of Huckleberry Finn" and focuses on at least three-fourths of the book.  The film follows a boy named Huckleberry Finn and an escaped slave named Jim, who travel the Mississippi River together and overcome various obstacles along the way. A Kid in King Arthur's Court is a 1995 Disney family film directed by Michael Gottlieb.  It is based on the famous Mark Twain novel "A Connecticut Yankee in King Arthur's Court" (previously filmed by Disney as "Unidentified Flying Oddball" in 1978 in which Ron Moody also played Merlin), transplanted into the twentieth century.  Trimark later released a sequel, "A Kid in Aladdin's Palace", in 1998, but without Disney's involvement.  Since Trimark's dissolution, the sequel is now distributed by Lions Gate Entertainment. Huckleberry Finn and His Friends was a 1979 television series documenting the exploits of Huckleberry Finn and Tom Sawyer, based on the novels "The Adventures of Tom Sawyer" and "Adventures of Huckleberry Finn" by American writer Mark Twain. Adventures of Huckleberry Finn (or, in more recent editions, The Adventures of Huckleberry Finn) is a novel by Mark Twain, first published in the United Kingdom in December 1884 and in the United States in February 1885.  Commonly named among the Great American Novels, the work is among the first in major American literature to be written throughout in vernacular English, characterized by local color regionalism.  It is told in the first person by Huckleberry "Huck" Finn, a friend of Tom Sawyer the narrator of two other Twain novels ("Tom Sawyer Abroad" and "Tom Sawyer, Detective").  It is a direct sequel to "The Adventures of Tom Sawyer". Samuel Langhorne Clemens (November 30, 1835 – April 21, 1910), better known by his pen name Mark Twain, was an American writer, humorist, entrepreneur, publisher, and lecturer.  Among his novels are "The Adventures of Tom Sawyer" (1876) and its sequel, the "Adventures of Huckleberry Finn" (1885), the latter often called "The Great American Novel". Tom Sawyer & Huckleberry Finn is a 2014 American comedy-drama/adventure film starring Joel Courtney as Tom Sawyer, Jake T. Austin as Huckleberry Finn, Katherine McNamara as Becky Thatcher, Noah Munck as Ben Rogers, and with Val Kilmer as Mark Twain.  It is based on Mark Twain's novels "The Adventures of Tom Sawyer" and "Adventures of Huckleberry Finn".  Directed by Jo Kastner, the film is released by VMI Worldwide.
Answer: The Great American Novel