D.W. keeps a snowball in the freezer from "the best day of her life," but it goes missing. Buster and Francine investigate, listening to biased accounts of those present the day the snowball disappeared. After several arguments and accusations, D.W. lets the incident go as the first snowfall of the year appears. Arthur, Buster, and Francine are assigned to do a group project on Ancient Rome. They separately work on a comic book, which ends up being inconsistent and not working due to disagreements. They learn that they have to work together to make a good project.