On the first day of school Arthur discovers he's got the toughest teacher in the Third Grade! Mr. Ratburn assigns so much homework, Arthur hardly has time to play or eat cookies. He studies so hard that he is chosen to represent his class in the all-school Spellathon. The pressure in on and Arthur's whole family helps him practice. But can he beat last year's champion speller? Will he let Mr. Ratburn d-o-w-n?