"If it weren't for the sharks, the reef would be a tropical paradise underwater. In this second adventure, Pi and Cordelia are now parents of their new son Junior. And Pi's shark enemy, Troy, is again on the loose, on the hunt with his shark gang, and just waiting for high tide. Pi decides to train his family and reef buddies in the art of water fu to have them all prepared for the underwater battle. When a mysterious new reef fish, Ronny, begins...