The canon of a work of fiction is "the body of works taking place in a particular fictional world that are widely considered to be official or authoritative; especially those created by the original author or developer of the world". Canon is contrasted with, or used as the basis for, works of fan fiction and other .
During George Lucas's time with the franchise, the Star Wars canon was divided into discrete tiers that incorporated the Expanded Universe (EU), with continuity tracked by Lucasfilm creative executive Leland Chee. Higher-tier and newer material abrogated lower-tier and older material in case of contradiction. The live-action theatrical films, the 2008 and its , and statements by Lucas himself were at the top of this hierarchy; such works invariably superseded EU material in case of contradiction. The EU itself was further divided into several descending levels of continuity. After Disney's acquisition of the franchise, Lucasfilm designated all Expanded Universe material published before 25 April 2014 (other than the first six theatrical films and the 2008 film and TV series) as the non-canonical "Legends" continuity. Material released since this announcement is a separate canonical timeline from the original George Lucas Canon, with all narrative development overseen by the Lucasfilm Story Group.
The makers of Doctor Who have generally avoided making pronouncements about canonicity, with Russell T Davies explaining that he does not think about the concept for the Doctor Who television series or its spin-offs.Doctor Who Magazine #388Doctor Who Magazine #356Davies RT, "The Writer's Tales"
The television series The Simpsons has an example of non-canonical material, being the Treehouse of Horror episodes, a series of Halloween-themed specials with several stories that take place outside the show's normal continuity.
Productions under Walt Disney Animation Studios are considered by The Walt Disney Company as the canonical stories under the company's "Disney" brand. Therefore, sequels, prequels, television series, or other related media produced by other studios of the company (as is the case of Disneytoon Studios and Disney Television Animation productions that serve as a continuity of the films), and events in other media like books or video games, are ignored within the main Disney brand, focused on productions under Walt Disney Animation Studios, thus other productions and media being considered non-canonical events.
Several anime television series adapted from manga stories count with some extra episodes with original stories that are not part of the original manga, often being referred to as "filler episodes," being outside of the canon of their source material.
However, sometimes in literature, original writers have not approved works as canon, but original publishers or of original writers posthumously approve subsequent works as canon, continuation novels such as The Royal Book of Oz (1921) (by original publisher), Porto Bello Gold (1924) (by estate), and Heidi Grows Up (1938) (by estate).
Sequels to the stories by P G Wodehouse about the butler Jeeves were sanctioned by Wodehouse's estate for Jeeves and the Wedding Bells (2013) by Sebastian Faulks and Jeeves and the King of Clubs (2018) by Ben Schott.
The Monogram Murders (2014) by Sophie Hannah is a sequel to Hercule Poirot novels authorised by the Agatha Christie estate.
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