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.
Arthur's third grade class goes hunting for fossils on a field trip to Rainbow Rock State Park, but when Buster actually finds one, he decides he wants to keep it instead of turning it over to the museum
After Buster defeats Brain in a math contest and is chosen to compete in the school marathon, Brain becomes convinced that he is no longer smart and so dubs Buster the new "brain" of the class.