Long, long ago, in a galaxie far, far away, stars of the 1970's gathered together to make this legendary holiday special. It was aired once and then shut away in the vaults forever. Only bootlegs of it exist, because of George Lucas disappointment with the final result. It tells the story of the Wookie holiday, Life Day and Chewbacca's journy home with Han Solo to spend it with his family. Making appearances on the show are Bea Arthur, Harvy Korman (in several roles), Art Carney and Dihanne Carroll, as well as Star Wars veterans, Mark Hamill and Carrie Fisher.
This has never been released on commercial DVD, though you can find unofficial copies of it around. It's also on YouTube in full. Above is part one, uploaded by Hazelwood1styear. Watch it soon! Lucas is notorious for wanting to destroy every copy of this show that he can lay his hands on.
Obscurity factor: 3 (legendary cult status, though rarely seen, not on DVD, available on YouTube)