While Mom and Dad are away, a pirate takes Billy and his sister Heidi on a wild adventure, sailing their "fish-stick finger" house to Itchy Ear Island and telling them quirky facts about pirates, parrots, and cabbages.
While conducting a tour of the "landlubbers' world" for a bus load of sea creatures, Pirate intercepts school-bound siblings Billy and Heidi and enlists their aid in recovering his hijacked ship from a troupe of mischievous monkey-crabs.