Three loyal friends - a girl, a dog and a monkey travel by submarine to the underwater city of Atlantis and help a mermaid and her dogfish who have a Giant Squid problem.
In the Puerto Rican rain forest, El Yunque, Annie, Ben and Mango meet the Chupacabra - who doesn't want to be scary, he wants to be a goat-herding DOG.
Before being allowed in the hot springs at Nagano, Japan, Mango must prove himself worthy in a Sumo wrestling match with Snowmonkima, the leader of the snow monkeys.
Annie finds half of a treasure map and she, Ben and Mango meet up with Captain John -- who has the other half of the treasure map. Together they go looking for a pirate's treasure chest.