The stars of TV comedy "The Big Bang Theory" are set to celebrate Star Wars Day on May 4 with a very special episode. Writers have teamed up with Lucasfilm special effects experts for a themed special that will air three days before the unofficial geek holiday. In the episode, the TV show's regulars will celebrate Star Wars Day, and TV veteran Bob Newhart will reprise his Emmy-winning role as Arthur Jeffries. The Lucasfilm Industrial Light + Magic technicians will recreate Yoda's home planet Dagobah for the special episode. "The Big Bang Theory" creator Chuck Lorre says, "We were approached by the Lucasfilm people to do something to celebrate Star Wars Day, which was nice."