The Simpsons Season 31, Episode 14 Bart the Bad Guy Family Animation Comedy IMDB 8 Country United States Duration 22 min Air Date 2020-03-01 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 Bart accidentally sees a new superhero movie one month before its intended release, and uses his knowledge to terrorize the other fans. Two executive producers of the film attempt to prevent Bart from leaking any more news to the public.