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.

Arthur's determination to prove he is responsible enough to have a puppy brings him a menagerie of animals to care for.

It takes a really embarrassing moment in the school cafeteria to cure Arthur of his fear of being caught in his underwear.

Arthur's tooth: Arthur, tired of being the only one in his class who still has all his baby teeth, waits impatiently for his loose tooth to fall out. Arthur's birthday: Arthur's friends must decide which party to attend when Francine schedules her birthday party for the same day as Arthur's birthday party. Arthur's pet business: Arthur's determination to prove he is responsible enough to have a puppy brings him a menagerie of animals to care for. Arthur's...

Arthur and D.W. do not know what is wrong with Baby Kate when they take her to the neighborhood fair--but Pal the puppy does.

When Arthur rakes the leaves for his father and then jumps into them, spreading them everywhere again, he needs a little help from his friends to get the job done.

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 friends become concerned when he tells them he has a broken heart and show up at his house ready to do whatever it takes to help.

When Buster impulsively drops a Cybertoy into Arthur's backpack in the drugstore one day, he feels so guilty that he finally confesses to his friend and they try to return the popular toy before anyone else finds out.

Buster tries to convince Arthur, the Brain, and his other friends that he not only saw a UFO but also a comet heading for the earth.