Many episodes featured actors, such as Steve Martin, Harvey Korman, Rita Moreno and Dom DeLuise; some featured veteran performers like Ethel Merman, Don Knotts and Vincent Price; some featured well-known pop singers, including Elton John, Diana Ross, Linda Ronstadt, and Leo Sayer. Sayer's show used his hit "The Show Must Go On": he changed the lyrics in the second verse slightly, from "I wish I could tear down the walls of this theatre" to "I wish I could tear down the walls of this Muppet theater". Some guest stars, such as Monty Python star John Cleese, co-wrote much of their own episodes. The second to last episode, in 1981, featured then-James Bond actor Roger Moore. Mark Hamill appeared in one episode as both himself and Luke Skywalker, his role in the "Star Wars" film series.