Dive into adventure with your favorite underwater explorers, the Octonauts! Join brave Captain Barnacles, daredevil ex-pirate cat, Kwazii, and medic Peso Penguin, along with the rest of the crew as they explore the world's oceans, rescue the creatures who live there, and protect their habitats - above and below the waves! On this exciting DVD, Captain Barnacles leads a mission to rescue Dashi, who is trapped inside a giant whale shark, Kwazii takes to the skies to retrieve a precious book from a school of flying fish! Peso tries to bandage a Great White Shark without becoming his lunch and much more! Plus - in a special extra feature, Tweak & Tunip tell you everything you ever wanted to know about the Gup-X!