Arthur is depressed when things don't go the way he wants them to be. He wants to have a weekend fishing alone with Mr. Read, being away from D.W., but a change of plans for the following weekend forces them to bring her along. He then gets jealous of her when she catches more fish than him by using an unusual technique she came up with herself.

One of D.W.'s socks goes missing, so Pal and Kate try to find it. The thief is revealed to be the Molinas' dog, Amigo, who tells them about the Sock Market, a parody of the stock market, and Pal tries to auction off socks from the house to get D.W.'s back.

Francine's bowling tournament and her cousin's bar mitzvah are at the same time, so her friends devise a plan allowing her to attend both events at once. However, Francine's friends forget some parts of the plan, and her parents eventually figure out what is going on. As punishment for missing half of the party, Francine is given extra chores.

Sue Ellen invites Muffy to spend the weekend with her in Crown City, a nearby metropolis, which Muffy thinks is a glamorous world of class, fashion, shopping, and high culture. However, her first trip is nothing like she imagined it would be as they go to an Ethiopian restaurant and listen to a poetry slam.

For an extra credit science project, Arthur builds a formicarium for ants, but all the ants spill out of the formicarium and he must find a way to attract them back in. When Arthur accidentally destroys Francine's project while trying to catch the ants, they get a new idea and team up to work on the project together.

Muffy starts an advice column, but one of the Tough Customers, Molly MacDonald, turns out to be a better advice giver. Muffy tries to improve her column by copying Molly's appearance and interests.

After causing two incidents involving lying to Alberto, the Tibbles fear they may end up in prison for lying. They swear to always tell the truth, but end up offending their friends and acquaintances. Alberto advises the twins not to say the first thing that comes to their minds and explains how they can be honest and nice at the same time.

After Binky accidentally breaks the Brain's new watch during a soccer game, they fight with each other while waiting for their parents (who are late) to pick them up.

To celebrate Elwood City's 100th anniversary, Mr. Ratburn's class is chosen to stage a musical based on the birth of the city. However, many arguments arise over which direction the play should take, and things eventually escalate into chaos. The play is a fiasco until Arthur willingly trades roles with Francine before the final act, and the show turns to be big success.

The Reads' car makes funny noises, but they can’t figure out what is wrong with it. To make matters worse, they can’t afford to repair or replace it. Fortunately, with the help of Buster and the Car Talk guys, Arthur figures out that Kate's rattle is stuck in the exhaust pipe.
Guest stars: Tom and Ray Magliozzi (the Car Talk guys) as Click and Clack Tappet.

Jenna Morgan is invited to Muffy's annual slumber party, but she is worried that she will be teased since she still wets the bed and has to wear a pull-up. So Jenna tries to hide her secret, but when her pull-up is exposed, Francine tells her that it is nothing to be embarrassed about as she used to have the same problem as Jenna.

After being forced to watch a movie with Arthur and his friends, D.W. wishes she was older than Arthur. She has a dream where she and Nadine alter the timeline so that she is bought first at the baby store before Arthur.

After a field trip to an Amish family farm, Buster changes his lifestyle to one of the Amish, but finds the adjustment very hard to do. After learning from Mrs. MacGrady that what he is doing is not fully Amish, since he is feeling lonely and miserable, Buster decides to return to his normal lifestyle.

During a sleepover at the science museum with Mr. Ratburn’s class, Binky is bored until he sees a new unopened exhibit about the future. Interested, he sneaks into the exhibit, only to be trapped inside. He has a dream where he is in the future with robot look-alikes of his friends.

Arthur and D.W. try to help out around the house when Mr. and Mrs. Read have colds, but they end up making things worse. So they try to fix their mistakes, fearing that they will have to learn to take care of things if Mr. and Mrs. Read remain ill. Their worries are cured when Grandma Thora arrives to help out.

Prunella invites Marina over for a sleepover. However, she is worried that Marina may get injured because she is blind. Marina dislikes the special treatment Prunella is giving her, and Prunella learns to treat Marina just like any other friend.

D.W. is surprised when she thinks that her snowball has returned (from "D.W.'s Snow Mystery") and tries to prevent it from being stolen again. After an investigation by the Brain, Arthur confesses that the snowball is actually an unflavored snow cone and that the real snowball is still lost, and that he got the fake snowball hoping D.W would end being bothered by the real one missing.

A fire strikes in Lakewood Elementary, so Arthur and his friends have to attend school at Mighty Mountain, their biggest rival. The fire affects everyone in various ways: Sue Ellen is upset when her diary is inadvertently burned, and Muffy isn’t understandable how important it is to Sue Ellen, and when Mr. Read barely makes it out of the fire, Arthur fears that something could happen to him again. Binky gets traumatized after witnessing the fire and pulls the alarm himself. Mr. Morris, the school janitor, injures his leg during the fire. Buster was absent when the fire occurred and is unable to relate to the others. Buster becomes friends with Mr. Morris until he chooses to retire to New Mexico. Binky overcomes his trauma with help from Oliver, who's a former firefighter. Arthur's fears ease when Mr. Read admits that he had a similar fear for Grandma Thora, when he was younger, and shows him how to handle it. Muffy gives Sue Ellen a new diary, along with a picture from the original diary that inspires Sue Ellen to move forward. Francine writes each of the inspiring stories in a school newspaper, and it is presented to everyone when the school reopens.