After seeing a UFO Buster has a hard time convincing his friends of what he saw, and when he gets pictures of the flying saucer, Brain comes up with an explanation for each one.
After Buster defeats the Brain in a math contest, the Brain declares Buster the new brain and decides to become a comedian, until his friends convince him that he is still as smart as ever.
Arthur and his hockey teammates, as well as the ghost of the greatest goalie of all time, help out when Buster worries he'll never be as good a goalie as his hero.
Unhappy about how much homework they have to do, Arthur and his friends dare each other to skip school, but their plans go wrong, leaving Francine to suffer the consequences.