THE SIMPSONS "The Bob Next Door" Season 21 Episode 22

Check out the first look of the new episode of THE SIMPSONS "The Bob Next Door" Season 21 Episode 22 airing Sunday May 16 (8:00-8:30 PM ET/PT) on FOX.

Episode Synopsis: THE SIMPSONS "The Bob Next Door" Season 21 Episode 22 - Bart becomes convinced that his new neighbor, Walt, is his archenemy, Sideshow Bob (guest voice Grammer), disguised and back for revenge. But when Marge tries to convince Bart otherwise by taking him to visit the state penitentiary, a disturbing truth is revealed in the all-new "The Bob Next Door" episode of THE SIMPSONS airing Sunday, May 16 (8:00-8:30 PM ET/PT) on FOX.

Voice Cast: Dan Castellaneta as Homer Simpson; Julie Kavner as Marge Simpson; Nancy Cartwright as Bart Simpson; Yeardley Smith as Lisa Simpson; Hank Azaria as Moe; Harry Shearer as Flanders/Skinner

Guest Voice Cast: Kelsey Grammer as Sideshow Bob