"Glee" has had its share of big-name guest stars in the course of its three seasons. But none have been as big, or at least as tall, as Chewbacca.  "Glee" star Matthew Morrison recently appeared on "Jimmy Kimmel Live" to discuss his directorial debut on the series' upcoming Christmas episode, "Extraordinary Merry Christmas," (airing Dec. 13) and revealed that the episode would be a combination of the "Star Wars Holiday Special" and the Judy Garland Christmas specials.  "We called up George Lucas, and he gave us Chewbacca," Morrison said. "There's only one guy who can officially be Chewbacca, and he lives in Northern California. They flew him in. ... We had Chewbacca for the day. It was just great. We were taking pictures with him. ... He's been doing it for 12 years."  Cast member Chris Colfer had previously offered proof of the presence of Chewbacca on his Twitter feed in November, sending out a picture of him hugging the big, hairy Wookie and writing, "I officially have my Christmas Card!!!"  The "Star Wars Holiday Special" aired just once in November 1978. It was a mix of a "Star Wars" adventure, with Han Solo and Chewbacca traveling to the Wookie home planet of Kashyyyk, and classic '70s variety show segments -- including Carrie Fisher as Princess Leia singing a song to John Williams' "Star Wars" theme music.  Chewbacca didn't sing there either.  "Glee" recap: Out of the flannel closet!  "Glee" adoption plot sparks online petition  Emmys 2011: Darren Criss on "Glee" cast controversy  Photo: Chris Colfer hugs Chewbacca. Credit: Chris Colfer / Twitter
Chewbacca won't sing, but he will make an appearance on the upcoming Christmas episode of "Glee." "Star Wars" creator George Lucas gave permission to "Glee" producers to use Chewbacca in the episode set to air Dec. 13.