Although Arthur and Francine aren't speaking to each other, they must find a way to set aside their differences when they are locked in the library after it closes.
When the quarters which Arthur has collected for Mrs. MacGrady's charity drive disappear, Buster attempts to solve the mystery and prove his friend's innocence.
Muffy is so sure that Francine can't be nice for an entire week that she bets her Princess Peach watch on it now it's up to Francine to keep her temper, will she be able to do it?
When Buster defeats the Brain in a math contest, he is chosen for the school mathathon. Crushed, the Brain says he's decided to become a comedian and declares Buster the new "brain."
When Buster rescues a cat stuck in a tree he is treated like a hero, but when he begins to enjoy his celebrity a little too much, his friends devise a plan to bring him back to his old self.
Francine is embarrassed by her old bicycle, which was once her father's, but when she makes up a story about the bike being stolen, she finds that it only causes more trouble for her.