After meeting a pirate on the way to school, Molly, Gil, and their classmates learn how to read a map and help find the pirate's treasure.

At head of title: Nickelodeon/Bubble Guppies. "Based on the screenplay 'X marks the spot' by Jonny Belt, Robert Scull, Bob Mittenthal, and Michael Rubiner." "Based on the TV series Bubble Guppies, created by Robert Scull and Jonny Belt."