When Muffy gets head lice, it ends up spreading to everyone at school, forcing the students and staff to be checked everyday instead of doing homework. This episode is shown from Arthur's point of view. Arthur is set to compete against Brain in a 3K race, with D.W. and the Tibbles helping him train. In the end, Arthur loses the race to Brain, but has his picture on the front page of the newspaper for helping Muffy up after she falls down.