Arthur and his friends are moving into the fourth grade, which Muffy and Francine are concerned about. Meanwhile, Arthur and Buster have their sights set on being in the fourth-grade class taught by the 'cool' new teacher.

Brain, D.W and Bud venture into Brain's brain after neither can remember where they can find the last Easter Egg in the Easter Egg Hunt.

Brain plans on seeing a meteor shower. He thinks he is cursed since every year something goes wrong and cannot see it.

Sue Ellen is dismissive about maths until she runs into a problem her artistic vision cannot solve.

Sue Ellen meets her pen pal but he is more interested in fashion than world culture.

Arthur gets a Mutant Muck Monster as a gift, which he later learns is worth two million dollars unboxed, but it has fallen into the D.W.'s hands.

After Binky wrecks the 18th hole at a miniature golf course, Muffy, Buster and Binky attempt to create a new 18th hole.

Carl agrees to play the accordion for George's puppet show reenactment of Goldilocks and the Three Bears for the local preschool class.

Buster enlists Binky's help as a method to prevent him from gorging cookies at a constant rate.

Aria, a silent girl in Mr. Ratburn's class, finally gets a chance to speak when she is appointed a school news anchor.

Binky's grandparents miss his big soccer game, and so he attempts a reenactment of the event making video postcards just as Buster did when he left with his dad.

Arthur and his friends believe that Mr. Ratburn has a secret identity.

When Buster and Ladonna bond, Arthur feels left out.

Pal's cousin Dr. Yowl whisks Pal, Kate and Mei Lin away on an adventure through the solar system in his kennel.

When George's giraffe puppet Wally goes missing, Fern and Binky war over who can find him.

After believing a false science show, Buster decides to never believe in anything without proof again.

One Ornery Critter - Buster is tasked with taking care of his aunt's dog Carrotcake, but she dislikes Arthur, which concerns him, as he believes that it will sabotage his position as being universally loved by dogs.

Francine needs money to buy some new cleats, so she takes a job as Muffy's personal assistant.

Muffy and Lydia join forces to topple a snobbish and unpleasant beauty queen.