The twins become popular when other kids discover they live at the hotel; Maddie tutors London in math.
Malcolm convinces Dewey to do poorly on an IQ test, but Dewey does so poorly that he ends up in a class for the emotionally disturbed; Hal and Craig become obsessed with a dance video-arcade game.
The twins and Maddie compete in the Battle of the Bands at the Tipton.
Zack helps his basketball team win an important game; London's shopping addiction gets out of hand.
Zack is excited when Cody goes away for two weeks; Mr. Moseby teaches London to drive.