Question: Which planet in the "Star Wars" universe is home to the Wookies and was featured in the Star Wars Holiday Special of 1978?

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Star Wars: Republic: Star Wars: Republic is an American comic book series set in the fictional "Star Wars" universe.  The series was published by Dark Horse Comics from 1998 to February 2006.  The series was originally titled simply "Star Wars", but acquired its "Republic" title at issue 46.  The entire series comprises 83 issues.  The "Star Wars: Republic" series is one of a number of comic book series set in the "Star Wars" expanded universe.

Wookieepedia: Wookieepedia: The "Star Wars" Wiki is an online encyclopedia for information on the "Star Wars" fictional universe—including information on all the films, as well as "Clone Wars", "" and its , "Rebels", the "Star Wars" expanded universe, and any upcoming "Star Wars" material.  It is a specialized wiki created to be an extensive encyclopedia of the "Star Wars" universe with some articles reaching up to 60,000 words, and is written almost entirely from an in-universe perspective.  The name Wookieepedia is a portmanteau of Wookiee and encyclopedia, a pun on the name of "Wikipedia".  The logo, too, is a visual pun showing the incomplete second Death Star as opposed to Wikipedia's incomplete "jigsaw logo".

Star Wars: Darth Plagueis: Star Wars: Darth Plagueis is a novel that is part of the "Star Wars" expanded universe.  It was written by James Luceno, and released on January 10, 2012.  The novel covers the later life and machinations of Sith lord Darth Plagueis, over a roughly fifty-year period pre-dating "Star Wars: The Phantom Menace".  The novel details Plagueis' overthrow of his own master Darth Tenebrous, his work as head of a powerful banking consortium on the Muun homeworld, his discovery, recruitment and training of the teenaged Sheev Palpatine of Naboo, and the efforts of Plagueis to undermine the Galactic Republic and ensure the dominance of the Dark Side of the Force.  The novel brings in scores of characters and locations already familiar in the "Star Wars" mythos, as well as introducing many others for the first time.  Events depicted on-screen in "Star Wars Episode I: The Phantom Menace", are re-told in "Star Wars: Darth Plagueis", often from a perspective not shown in the 1999 motion picture.

Star Wars MUSH: Star Wars MUSH (commonly referred to as SW1) is a text-based online role-playing game.  "Star Wars MUSH" was created in May 1991 and was released to the public in January 1992.  The game predates the majority of ""Star Wars" expanded universe" and as such largely deviates from the established "Star Wars" universe set after "Return of the Jedi".  The game scenario system is based on the discontinued West End Games' .  The game persisted throughout the '90s as one of the net's more successful "Star Wars"-themed MUSHes, earning a feature in "The Incredible Internet Guide to Star Wars".

Star Wars: Thrawn: Star Wars: Thrawn (also known simply as Thrawn) is a "Star Wars" novel by Timothy Zahn, published on April 11, 2017 by Del Rey Books.  It chronicles the origins of Grand Admiral Thrawn, a popular character originating from the "Star Wars Legends" line of works, which were declared non-canon to the franchise after Lucasfilm redefined "Star Wars" continuity in April 2014.  The novel was announced in July 2016 alongside news that the character Thrawn would be reintroduced into the "Star Wars" franchise on the 3D CGI animated television series "Star Wars Rebels".

Lego Star Wars II: The Original Trilogy: Lego Star Wars II: The Original Trilogy is a Lego-themed action-adventure video game developed by Traveller's Tales and published by LucasArts and TT Games Publishing.  It was released on 11 September 2006.  Part of the "Lego Star Wars" series, it is based on the "Star Wars" science fiction media franchise and Lego Group's "Star Wars"-themed toy line.  It follows the events of the "Star Wars" films "Star Wars", "The Empire Strikes Back" and "Return of the Jedi".  The game allows players to assume the roles of over 50 Lego versions of characters from the film series; customized characters can also be created.  Camera movement was improved from its predecessor—""; and the concept of "vehicle levels" was explored more thoroughly.  The game was revealed at American International Toy Fair 2006.  Promotions for the game were set up at chain stores across the United States.

Star Wars: Clone Wars (2003 TV series): Star Wars: Clone Wars (sometimes referred to as Tartakovsky's Clone Wars) is an American science fiction animated microseries created, directed, produced and co-written by Genndy Tartakovsky, set in the "Star Wars" universe.  Produced and released between the films "" and "", it is the first of many works to explore the conflict set between the two known as the Clone Wars, and directly leads to the events of "Revenge of the Sith".  The show follows the actions of various characters from the "Star Wars" prequel trilogy, notably Jedi Knights and clone troopers, in their war against the battle droid armies of the Confederacy of Independent Systems and the Sith.  The series is notable for introducing the character of General Grievous to the "Star Wars" universe.

Star Wars Trilogy Arcade: Star Wars Trilogy Arcade is an arcade game first released in 1998.  The game is a 3-D rail shooter based on the original trilogy of "Star Wars" films and was released along with the special editions of these films.  Accompanied by the "Star Wars Trilogy" pinball game, it is the second in Sega's "Star Wars Arcade" series; it is preceded by 1993's "Star Wars Arcade" and followed by 2000's "Star Wars Racer Arcade".

Star Wars Holiday Special: The Star Wars Holiday Special is a 1978 American musical science fiction television film set in the "Star Wars" galaxy.  It stars the first film's main cast while introducing the character Boba Fett, who would appear in later films.  It is one of the first official "Star Wars" spin-offs and was directed by Steve Binder.

Kashyyyk: Kashyyyk ( , or ), also known as Wookiee Planet C, is a planet in the "Star Wars" universe.  It is the tropical, forested home world of the Wookiees.  According to interviews given by "Star Wars" creator George Lucas, the home of the Wookiees was originally intended to be the forest moon of Endor which plays a key role in the plot of the sixth film of the series, "Return of the Jedi".  However, Lucas decided that since the Wookiee Chewbacca was clearly proficient with advanced technology (i.e. he was pilot and mechanic of the spaceship the "Millennium Falcon" and he repaired the damaged droid C-3PO), it would be confusing to show the Wookiees with a primitive, "stone age" culture on Endor.  The Ewoks were created instead to populate the moon and to help fight the Imperial garrison stationed there.  Kashyyyk made appearances in the "Star Wars Holiday Special" and "".

Supporting paragraphs: Kashyyyk Star Wars Holiday Special
Answer: Kashyyyk