Arthur is determined to win a year's supply of Crunch cereal by composing a jingle, but he cannot come up with any ideas. He hears D.W. singing a song about Nadine and copies it. Arthur feels guilty, so he mails the song with D.W.'s name instead of his, and it wins the contest, much to D.W.'s confusion. D.W. is jealous of Emily's performance in their gymnastics class and is determined to become better than her, which endangers her when she climbs on a high balance beam and nearly hurts herself. Afterward, D.W. and Emily apologize to one another and become friends.