The Bob Next Door
"The Bob Next Door" is the twenty-second and penultimate episode of the twenty-first season of the American animated television series The Simpsons. It originally aired on the Fox network in the United States on May 16, 2010. In the episode, Bart Simpson becomes convinced that their new neighbor is Sideshow Bob in disguise, but after a trip to the Springfield Penitentiary they find a distressed Bob still incarcerated. Eventually, Bart discovers that Bob has surgically swapped faces with Walt, who was his cellmate at that time, and still plans to kill him, although he is ultimately defeated. The episode was written by John Frink and directed by Nancy Kruse. The episode guest stars Kelsey Grammer as Sideshow Bob. The episode's plot is based on the film Face/Off. "The Bob Next Door" received positive reviews from critics; most agreed that it was a funny return for Sideshow Bob and an improvement over "The Italian Bob" and "Funeral for a Fiend". Plot A financial crisis in Springfield causes the sale of many houses and release of all low-level criminals from Springfield Penitentiary, including a man named Walt Warren. Walt purchases a house next door to the Simpson family and charms the neighborhood.