Presents a novelization of the 2003 feature film in which the Rugrats find themselves marooned on an island after their cruise ship sinks, and their only hope of rescue, Nigel Thornberry, has suffered an accident that leaves him speaking baby talk.
Rhyming text and illustrations follow the adventures of a baby who on excursions to the zoo, the circus, or the farm manages to get switched with an animal.
Ma, Pa, and the rest of the family try a variety of amusing things to get their baby to laugh, but he persists in his bad mood until his brother the sheriff arrives with a challenge.