Season 3
20 episodes · Sep 4, 2013
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S3E1The Siphonophore
Sep 4, 201311mKwazii and Dashi become entangled in a strange deep-sea creature - a siphonophore.
S3E2The Water Bears
Sep 5, 201311mThe gang ventures into a red-hot lava tube to rescue a tiny water bear that does not seem to mind the heat at all.
S3E3The Cone Snail
Sep 6, 201311mPeso 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.
S3E4The Artificial Reef
Sep 9, 201311mWhen an underwater storm destroys a small reef, Tweak and her crew try to convert the Gup-F into an artificial equivalent.
S3E5The Humpback Whales
Sep 10, 201311mWhen a sardine swallows the key to a treasure chest, a humpback whale helps Kwazii track it down.
S3E6The Pelicans
Sep 11, 201311mWhen a floating garbage patch endangers a flock of pelicans and other sea creatures, the Octonauts and the birds work together to clean it up.
S3E7The Sea Pigs
Sep 12, 201311mThe 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!
S3E8The Yeti Crab
Sep 13, 201311mAs 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.
S3E9The Barracudas
Mar 10, 201411mShellington and the Vegimals' mission to replant a mangrove forest is put in peril by a school of toothy barracudas.
S3E10The Duck-Billed Platypus
Mar 11, 201411mWhile rescuing river creatures after a storm, the Octonauts find a strange egg and come under attack by stinging platypuses.
S3E11The Sea Skaters
Mar 12, 201411mWhen 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.
S3E12The Mudskippers
Mar 13, 201411mThe Octonauts attempt to keep the peace amongst a trio of mudskippers whose home has been flooded.
S3E13The Harbour Seal
Mar 14, 201411mWhen Peso's patient, a remora fish, mysteriously disappears, the Octonauts enlist a unique undersea detective - a harbour seal.
S3E14The Lion's Mane Jellyfish
Mar 17, 201411mA lion's mane jellyfish gets its long and stingy tentacles tangled in the bubble engine, unintentionally flooding the Octopod and causing havoc.
S3E15The Red Rock Crabs
Mar 18, 201411mWhen Shellington and the crew try to gather some skittish crabs who have drifted away from home, they get help from some old friends.
S3E16The Sea Sponge
Mar 19, 201411mA sea sponge that houses other sea creatures in its pores suffers from a mysterious illness and Peso must figure out the cause.
S3E17The Immortal Jellyfish
Mar 20, 201411mShellington and the Octonauts try to track an unusual creature: a jellyfish that can transform from old to young repeatedly - and live forever!
S3E18The Urchin Invasion
Mar 21, 201411mThe 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!
S3E19The Hammerhead Sharks
Sep 21, 201511mThe 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.
S3E20The Loggerhead Sea Turtle
Sep 22, 201511mAfter an undersea tremor separates the Gup-X and its crew, Barnacles seeks guidance from a mysterious sea turtle.