When he decides to turn his fifth grade teacher's love of the dictionary around on her, Nick Allen invents a new word and begins a chain of events that quickly moves beyond his control.
Uncle, who is a pirate, doesn't fit in with the other members of the yacht club, so he starts his own club, buys a treasure map, and ends up marrying a mermaid.
Arthur is unhappy about going on vacation with his family, but he shows them how to make the best of a bad situation when they end up stuck in a motel because of rain.