Arthur doesn't believe that his little sister can really read, so he challenges her to prove it.

After finally getting her first library card, Arthur's little sister D.W. tries to check out her favorite book, with humorous results.

D.W. bosses her brother Arthur into carrying her on his shoulders at the beach because she maintains that she hates the water, until she gets a big wet surprise.

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.

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

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 starts saving the money he earns in order to buy a surprise birthday present for D.W.

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 unwittingly tells his bored sister D.W. a story.