Arthur's class is chosen to stage a musical tribute for its city's centennial celebration. But soon the rehearsals become a drama of missed cues, inflated egos, and alien invasions. And that's behind the curtain! In front, seated in the audience, viewers will glimpse returning animated guest stars-including Art Garfunkel, Fred Rogers, and Michelle Kwan-all invited by Muffy to the show. And if that weren't enough, CNN's Larry King gets into the action by becoming the first live action guest star to appear with the animated ARTHUR cast, as he interviews them during the show's intermission.