The family's van breaks down while on the way to an anniversary dinner for Arthur's parents.
Arthur and his friends are afraid to go outside after watching a scary movie; Fern seeks advice from a mysterious author.
The kids learn about the importance of a balanced diet; D.W. finds it hard to keep a secret.
Francine bets Arthur that her family uses less water; Arthur and D.W. believe they will find treasures in the attic that will make them famous.
D.W. wants to be the first person on Mars but fears there may be aliens; Arthur takes the blame for cracking Dad's cake platter.
The Elwood City Grebes may have a chance to win the title; Arthur finally gets the bike of his dreams but fears to use it.
Arthur cannot wait to finish reading his book, but the last few pages are missing; D.W.'s friends stop playing with her because she is too bossy.
A champion bike-rider inspires Binky; D.W. needs ear surgery and learns how hospitals help children get better.
Everyone at school starts speaking their own made-up language; the grand opening of World Girl World.
Arthur thinks he could win the Lakewood Elementary cooking contest; Buster volunteers to deliver the school mail.