The Simpsons (1989): Season 31, Episode 14

31 - 14: Bart the Bad Guy

Bart accidentally sees a brand-new superhero movie a month before it comes out.. and the world cowers before his newfound plot-spoiling powers. Thus, a new super-villain is born: Spoiler Boy! Can heroic movie executives stop Bart before he succumbs to the temptations of ultimate evil? Find out.