Arthur's little sister wants to wear glasses like her brother and tries to prove she needs them.

Arthur is resentful when he is not allowed to go sledding with his friends until after the roads are plowed because his sister, D.W., is too small to wade through the deep snow.

Even though her brother Arthur says she is too little to help with the upcoming wedding, D.W. proves she is just the right size when disaster strikes during the ceremony.

After hearing about the exciting summer vacations of his classmates, Arthur decides to write an embellished version of his own summer experiences.

Arthur and his friends are getting ready for a new day of school, but when it turns out that Arthur has forgotten his homework, it is his (sometimes) annoying little sister, D.W., who saves the day.

Arthur is in for some embarrassing moments after he, D.W., and their mother shop for school supplies and end up buying two identical backpacks.

Arthur and his family--and D.W.'s favorite doll, Mary Moo-Cow--take a vacation to New York City.