Arthur and Buster are playing frisbee in the park when their frisbee lands in a polluted fountain. Arthur's dad overhears Arthur and Buster talking about the park and Arthur involuntarily becomes the leader of a cleanup crew of kids. Arthur's friends are not pleased with the idea after their parents had been informed and do not help him. This gets worst as Pal almost chokes on a piece of litter. With the help of Francine's dad, Mr. Frensky, and a few volunteers, they manage to clean up the park.