Things start out fine when Rainbow Fish and his friends organize an impromptu sports day, but Spike is a sore loser, Puffer is a poor winner, and no one has any fun until Dyna finds a solution.
Nine-year-old Ben, a natural athlete and member of the Bobcats co-ed soccer team, wants to overcome his inexperience and prove himself on the field, but his obnoxious teammate, Mark, keeps hogging the ball.
Eleven-year-old Garry, embarrassed when his unathletic brother joins his lacrosse team, faces a bigger problem when the team bully turns on both of them.
Feeling bad about last year's Field Day, in which her slow running cost the relay team a victory, Nancy, who enjoys using fancy words, finds herself facing another Field Day and another relay race with a mean classmate.