Arthur, D.W., and Buster are spending a few days at the beach. There, they discover the simple joys of building sandcastles. But endless tidal waves hit shore as they try to make their perfect and sandy masterpieces.

Arthur's friends are fed up with Buster's sloppy habits, but they have gone too far when Buster develops mysophobia and starts seeing germs everywhere.

Arthur is willing to have the newly released video game, "Revenge of the Moomies". He tries to sell his old toys to save plenty of money for the game, but he will lie about how great his toys are to earn an allowance for something he wants?

Upon realizing that they forget about Grandparents Day, the Tibbles decide to surprise their grandmother by taking her out to dinner, but she would rather stay home. But their table manners have something to do with her turning down their invitation.

Vicita loses her favorite book so she can't sleep. Arthur and D.W. try to cheer her up by re-writing their own version of the book.

An anxious Prunella discovers that college is for well-rounded students. Without tuition to offer a prospective program, she piles on extracurricular activities. Can Prunella crack under the heavy load?

Fern gets a Portilex cell phone for emergencies, but is addicted to it with severe texts and calls from Muffy. When the phone's battery dies, Fern drops the device onto a crosswalk and a truck runs it over.

Everyone knows that the Brain is the smartest kid in class. What they don’t know is that he got held back in kindergarten, and the reason why: he was not yet fully emotionally developed. That's a fact the Brain would like to keep as a secret.

When Nadine is missing, Kate and Pal try to find out where she went, suspecting that the Tibbles have kidnapped her.

During a weekend trip to Crown City, Sue Ellen finds a diary on an old train and wonders who it belongs to.

Matt Damon guest stars in animated form as a presenter of Arthur's favorite TV program, "Postcards from You". His character asks viewers to send in homemade movies, which sparks a craze amongst Arthur and his friends.

Mr. Molina is teaching a dance class for the students as Francine and George are paired together. Who would have guessed that George and Francine could be the next Fred and Ginger?

It's Halloween in Elwood City and D.W. has the hiccups again (from "Arthur vs. the Piano"). As it continues, none of the other Reads remedy work, she miserably contemplates spending the rest of her life with her hiccups, so Arthur helps her cure them before going trick-or-treating.

An annoyed Buster blames the Brain for being right about everything, he'll screw up eventually and Buster pesters him until he finally gets something wrong.

It's Thanksgiving in Elwood City and Mr. Ratburn assigns his class to write essays about different Thanksgiving topics. Francine cheats by plagiarizing an essay off the Internet about Pilgrim cuisine. When she learns that plagiarism is illegal, she rewrites her assignment and confesses to Mr. Ratburn what she did.

Everyone that is, is into the new supermarket reality show on TV, except for Arthur. When Buster quits watching Bionic Bunny and is addicted to the new series, Arthur is anxious that their friendship will be over permanently.

D.W. tells her playgroup friends about her perfect skills at ice skating. The truth is, she can barely stand on ice. Due to the upcoming part of Emily's skating party, will D.W.'s friends find out that she is lying?

Accused of being spoiled by her friends, Muffy sets about to prove them wrong by being the most charitable person around, but Francine is unimpressed by Muffy's token efforts. Finally, a used clothing store helps Muffy discover her true talents, and the true meaning of charity.

Binky is excited when Mr. and Mrs. Barnes decide to adopt a Chinese baby girl whom they name her Mei Lin. The thought of a baby sister makes Binky relieved, until he realizes there are some changes in store. A year later, the Barnes' travel to China to meet Mei Lin. Binky then realizes that not only having a sister in their house is harder than he thinks, but also that being a big brother has its own rewards too.