While on a mapping expedition with Jeremy's great-aunt Adelaide, Denver and the gang run into two bizarre alligator poachers, and a love-sick alligator, who mistakes Denver for one of his own kind.

The boys receive an invitation from their friend Senior Santos to spend a relaxing week at a resort located on the mythical island of Canatta.

Denver fantasizes about battling evil aliens from Pluto in a 1950's style sci-fi adventure.