Six episodes from the children's animated series following a team of underwater adventurers. Led by Captain Barnacles Bear, Lieutenant Kwazii Cat, Doctor Peso Penguin and the other heroes travel through the sea helping various creatures and making new discoveries. After a hard day's work they return to their base, known as the Octopod. The episodes are: 'Octonauts and the Mariana Trench Adventure', 'Octonauts and the Colossal Squid', 'Octonauts and the Gulper Eels', 'Octonauts and the Sea Pigs', 'Octonauts and the Siphonophore' and 'Octonauts and the Yeti Crab'.