After Arthur called Francine a marshmallow, Francine and her friends get really mad and it looks like they are going to fight. But when they both get locked inside the Elwood City Library they either have to make up, or prepare for a long and scary weekend, because it's the weekend and the library closes until Monday.

Arthur has a new puppy is exactly what he wanted. But the only problem is that he destroys everything in sight, so can Arthur teach Pal to behave, before his parents do something with Pal because of all the disasters he is causing.

Francine tries to get through picture day, without messing up her meticulously-crafted hairdo.

Arthur does some heavy-duty studying, in order to compete in the school's upcoming spelling bee.

When the class goes on a field trip to a dinosaur museum, Buster finds a fossil on the ground - and wants to keep it for himself.

D.W. has an imaginary friend, Nadine, says she has to come everywhere, but Arthur is sick of it.

Buster's grades aren't as good as his jokes, and now he is on the verge of repeating his third grade year. If he does not receive at least a B on his next test, he fails...

Arthur is embarrassed because he now has to wear glasses.

Arthur and Buster fear that their new teacher, Mr. Ratburn, is some kind of evil maniac who collects children's heads - until they discover the truth about him, of course.

Arthur's dream is to have Moon shoes, but he does not have the ten dollars to get them. When he begins working chores to receive money, he got too desperate and does something he will regret.

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Whew, boy is it HOT today. The Reads decide to head to the beach in order to cool off, but D.W. refuses to go along (she thinks there is an octopus in the water).

When Arthur desperately wants a dog, he starts a pet business. When he gets too many he decides to just take care of one pet.

Arthur had a job to collect coins for Mrs. McGrady to raise money for a new dog for the Elwood City firemen, and when he left the bag of quarters where Mrs. McGrady was working, she said she never received them. While this was happening, Buster opened his detective agency, he has no idea his first job will involve Arthur. Now, it is up to Buster to solve this mystery, was Arthur the real thief?....

Viewers are taken back, as Arthur and D.W. recollect what happened when Baby Kate was first-born. D.W. is excited with anticipation, but Arthur is very worried. His worries are only made worse when his friends tell him about all the awful stuff that's going to happen when the baby comes. Still, Arthur, is determined to be a good big brother, but ends up thinking that the baby hates him!

D.W. was excited to have a new little sister, but when she doesn't get to help much and the baby moves into her room, things don't seem so great. Kate stinks and makes a lot of noise. D.W. hatches a plan to get rid of her, but finds that maybe being a big sister isn't so bad after all.

Mr. Ratburn gives the class an assignment --- to write a story about anything they want. It seems like a simple assignment and it doesn't even have to be bound and sent to a publisher as Muffy suggests. Arthur, however, finds it a hard task when he starts trying to write to please everyone's tastes. He starts out with the simple story of how he got his dog Pal, but after following the advice of each of his friends, it morphs into a bizarre country tune about baby elephants being born in outer space.

When D.W. gets told she doesn't like any interesting stuff, she decides to copy Arthur.

The Read Family is having a big reunion, with aardvark relatives from all over coming. Arthur normally enjoys the festivities, such as sack-racing and swapping stories, but finds himself hiding because he's worried that his cousin Mo has a big practical joke planned for him. He remembers her being awful to him in the past and is sure that she has something big planned. However, his worries might just be unfounded.

D.W. suffers through the death of her beloved bird, then has to decide whether to risk her heart again by adopting a lonely toad.

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When Arthur checks out a library book and loses it a week later; he thinks he is banned from the library. So he and Binky team up to find it.

Arthur and his friends go to summer camp and Binky brings up the issue that it's boys vs. girls. The other team participating always won because of this problem, so now the kids of Elwood must work together to defeat them this year.

Francine has always gotten the worst roles in school plays, so everyone in the Ratburn class asks Mr. Ratburn to give her a good part in the next one. The play is about Thomas Edison, and Francine is given the role of Edison himself. She takes her role very seriously, to the point where she starts to trying to run everything her way and insults her friends. After the hurt and the anger, they set out to show her that she can't just forget their needs

Arthur is lonely when Buster starts spending time with a new super-cool friend named Mike.