When Arthur and Buster try to take the bus to Arthur's swimming lesson, they fall asleep and end up in a strange part of town.

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

When Arthur starts talking about his school project involving a Big Green Machine, D.W. imagines a scary contraption that will turn everyone green.

Arthur's new puppy causes problems when it tears the living room apart, wets on everything, and refuses to wear a leash.

Arthur thinks that having his teacher stay at his house will be a horrible experience.

Arthur's essay wins a contest and he has to read it to the President in a special ceremony at the White House.

When Arthur sees advertisements for the amazing doggy Treat Timer, he decides to earn enough money to buy it for his dog Pal. Arthur's purchase of a Treat Timer for his puppy, Pal, backfires when the device only frightens his pet.

Arthur has to write a story as a homework assignment and keeps changing his idea of what to write as he talks to his friends.

When Buster defeats the Brain in a math contest, he is chosen for the school mathathon. Crushed, the Brain says he's decided to become a comedian and declares Buster the new "brain."

If Arthur and Buster cannot find a way to get Francine and the Brain to stop fighting, their soccer team will never make it to the play-offs.