Bartman goes mano y loco with Dr. Colossus when Springfield’s resident supervillain uses a special ray to turn everyone in town into a ten-year-old! But the colossal crackpot has met his match when Bart gathers the largest super team of ten-year-olds ever assembled for an assault on Death Mountain! Can Bartman and the ten-year-old townspeople save Springfield... before their bedtime?