The Simpsons Season 18, Episode 21 24 Minutes Family Animation Comedy IMDB 8 Country United States Duration 22 min Air Date 2007-05-20 Actors Dan Castellaneta (Homer Simpson / Abe Simpson / Barney Gumble / Krusty (voice)) Julie Kavner (Marge Simpson / Patty Bouvier / Selma Bouvier (voice)) Nancy Cartwright (Bart Simpson / Nelson Muntz / Ralph Wiggum (voice)) Yeardley Smith (Lisa Simpson (voice)) Hank Azaria (Moe Szyslak / Chief Wiggum / Apu / Comic Book Guy / Carl (voice)) Harry Shearer (Ned Flanders / Mr. Burns / Smithers / Skinner / Lenny (voice)) Overview In a parody of "24," the school's Counter Truancy Unit tries to stop three sixth-graders planning to disrupt the school bake sale with a stink bomb.