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."

The Brain does not believe in superstition, but when he tries to prove that superstitions are nonsense he starts finding bad luck everywhere he turns.

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 any

Arthur and his friends set out to make the world's largest pizza so that their feat can be recorded in "The Book of Incredible and Amazing World Records."

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.