Question: What planet made an appearance in a 1978 musical science fiction television film set in the "Star Wars" galaxy?

Context articles: Star Wars: Clone Wars (2003 TV series)
Générations Star Wars et Science Fiction
Star Wars: Lost Stars
Star Wars Adventure Journal
Kashyyyk
Star Wars Encyclopedia
Lego Star Wars II: The Original Trilogy
Galaxy of Fear
Sarlacc
Star Wars Holiday Special

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.
Générations Star Wars et Science Fiction (English: Star Wars and science fiction generations), also called "Gen SW", is a French fan convention whose main subject is the "Star Wars" universe.
 Other topics are the comics, the science fiction and the fantasy.
 It is held once a year in Cusset, Allier since 1999.
 Among its most notable guests are the major "Star Wars" actors Anthony Daniels (C-3PO), Peter Mayhew (Chewbacca), Jake Lloyd (Anakin Skywalker) and David Prowse (Darth Vader) or renowned comics artists like Tom Palmer and Davide Fabbri.
Star Wars: Lost Stars is a 2015 young adult science fiction novel by Claudia Gray that is set in the "Star Wars" galaxy.
 The novel depicts a narrative set before, during and after the events of "Star Wars", "The Empire Strikes Back" and "Return of the Jedi", in which the Galactic Empire has tightened its stranglehold on systems in the Outer Rim and the Rebel Alliance grows in strength, as well.
The Star Wars Adventure Journal was a publication distributed by West End Games between 1994 and 1997.
 Fifteen issues were printed, containing short stories set in the "Star Wars" expanded universe by both well-known and relatively unknown Star Wars authors; adventures and source material for the West End Games version of the ; "Galaxywide NewsNets" were fictional news reports from throughout the galaxy; interviews with personalities from all walks of Star Wars literature; and reviews of new and upcoming Star Wars products.
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 "".
Star Wars Encyclopedia is a 1998 reference book written by Stephen J. Sansweet, the director of content management at Lucasfilm and science fiction author.
 The book defines, explains, and illustrates the characters, creatures, settings, objects, events, and concepts that appear in the science fiction saga "Star Wars".
 Data is drawn from the original trilogy films, radio dramas, novels, short stories, graphic novels, and computer games.
 "Star Wars Encyclopedia" contains an introduction written by science fiction writer Timothy Zahn.
 The book was expanded and updated in 2008 under the title "Complete Star Wars Encyclopedia".
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.
Galaxy of Fear is a series of science fiction novels set in the "Star Wars" galaxy three years after "".
 The books are meant for younger readers.
 The books ranged from 100 pages to 200 pages in large print.
 The series of 12 books was written by John Whitman, and were released from February 1997 through to October 1998.
 The "Galaxy of Fear" line was created with an intent to cash in on the popularity of, and was meant to be a science fiction parody of, the "Goosebumps" franchise.
The sarlacc (plural sarlacci) is a fictional creature in George Lucas's science fiction saga "Star Wars".
 It first appeared in the film "Return of the Jedi" (1983) as a multi-tentacled alien beast whose immense, gaping maw is lined with several rows of sharp teeth.
 The sarlacc in the film inhabits the Great Pit of Carkoon, a hollow in the sand of the desert planet Tatooine.
 This creature is one of the largest of several sarlacci scattered across the "Star Wars" galaxy.
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.