Season 3

01 The Siphonophore Episode 14th September 2013 Kwazii and Dashi become entangled in a strange deep-sea creature - a siphonophore. 02 The Water Bears Episode 25th September 2013 The gang ventures into a red-hot lava tube to rescue a tiny water bear that does not seem to mind the heat at all. 03 The Cone Snail Episode 36th September 2013 Peso sets out to save the day when a cone snail invades the octopod and picks off the crew one by one with its dangerous harpoons. 04 The Artificial Reef Episode 49th September 2013 When an underwater storm destroys a small reef, Tweak and her crew try to convert the Gup-F into an artificial equivalent. 05 The Humpback Whales Episode 510th September 2013 When a sardine swallows the key to a treasure chest, a humpback whale helps Kwazii track it down. 06 The Pelicans Episode 611th September 2013 When a floating garbage patch endangers a flock of pelicans and other sea creatures, the Octonauts and the birds work together to clean it up. 07 The Sea Pigs Episode 712th September 2013 The Octonauts must stop a huge herd of sea pigs before they march blindly into the Mariana Trench - where there will be no access to food. But things get chaotic when Tunip goes missing! 08 The Yeti Crab Episode 813th September 2013 As Tweak tests the Gup-X deep down in the Midnight Zone, a yeti crab cuts a vital electrical wire in the ship and cuts off all power, endangering itself and the Octonauts. 09 The Barracudas Episode 910th March 2014 Shellington and the Vegimals' mission to replant a mangrove forest is put in peril by a school of toothy barracudas. 10 The Duck-Billed Platypus Episode 1011th March 2014 While rescuing river creatures after a storm, the Octonauts find a strange egg and come under attack by stinging platypuses. 11 The Sea Skaters Episode 1112th March 2014 When Kwazii gets lost at sea aboard the tiny octo-ski, he meets a flotilla of even tinier sea skaters - the only insects who live on the ocean. 12 The Mudskippers Episode 1213th March 2014 The Octonauts attempt to keep the peace amongst a trio of mudskippers whose home has been flooded. 13 The Harbour Seal Episode 1314th March 2014 When Peso's patient, a remora fish, mysteriously disappears, the Octonauts enlist a unique undersea detective - a harbour seal. 14 The Lion's Mane Jellyfish Episode 1417th March 2014 A lion's mane jellyfish gets its long and stingy tentacles tangled in the bubble engine, unintentionally flooding the Octopod and causing havoc. 15 The Red Rock Crabs Episode 1518th March 2014 When Shellington and the crew try to gather some skittish crabs who have drifted away from home, they get help from some old friends. 16 The Sea Sponge Episode 1619th March 2014 A sea sponge that houses other sea creatures in its pores suffers from a mysterious illness and Peso must figure out the cause. 17 The Immortal Jellyfish Episode 1720th March 2014 Shellington and the Octonauts try to track an unusual creature: a jellyfish that can transform from old to young repeatedly - and live forever! 18 The Urchin Invasion Episode 1821st March 2014 The Octonauts head to the kelp forest to visit Shellington's sister, Pearl, and her newborn son Periwinkle - only to find the forest endangered by an infestation of kelp-eating urchins! 19 The Hammerhead Sharks Episode 1921st September 2015 The Octonauts meet some hammerheaded sharks, however, they can't sleep too well because Shellington and Professor Inkling have been arguing about who is smarter that they are no longer friends. 20 The Loggerhead Sea Turtle Episode 2022nd September 2015 After an undersea tremor separates the Gup-X and its crew, Barnacles seeks guidance from a mysterious sea turtle.