D.W. makes a bet with Arthur that she can teach Baby Kate how to read in a single afternoon. The loser of the bet has to change their little sister’s stinky diapers! D.W. devises a clever trick to make sure she wins the bet. But will Arthur fall for it—or come up with a trick of his own before the next diaper change is needed?

Two things suggest that Arthur, the loveable star of children s books and the PBS series, may not be so fictitious after all: 1) Kids are known to call Marc Brown s house looking for their bespectacled friend and 2) Brown s third grade class picture -- according to many, a dead-ringer for the aardvark himself.