An intrepid band of explorers roam the oceans in search of adventure and fun. Led by a valiant polar bear and a daredevil kitten, these eight talented critters are always ready to embark on an exciting new mission.
The SiphonophoreKwazii and Dashi become entangled in a strange deep-sea creature - a siphonophore.
The Water Bears
E2
The Water BearsThe gang ventures into a red-hot lava tube to rescue a tiny water bear that does not seem to mind the heat at all.
The Cone Snail
E3
The Cone SnailPeso 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.
The Artificial Reef
E4
The Artificial ReefWhen an underwater storm destroys a small reef, Tweak and her crew try to convert the Gup-F into an artificial equivalent.
The Humpback Whales
E5
The Humpback WhalesWhen a sardine swallows the key to a treasure chest, a humpback whale helps Kwazii track it down.
The Pelicans
E6
The PelicansWhen a floating garbage patch endangers a flock of pelicans and other sea creatures, the Octonauts and the birds work together to clean it up.
The Sea Pigs
E7
The Sea PigsThe 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!
The Yeti Crab
E8
The Yeti CrabAs 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.
The Barracudas
E9
The BarracudasShellington and the Vegimals' mission to replant a mangrove forest is put in peril by a school of toothy barracudas.
The Duck-Billed Platypus
E10
The Duck-Billed PlatypusWhile rescuing river creatures after a storm, the Octonauts find a strange egg and come under attack by stinging platypuses.
The Sea Skaters
E11
The Sea SkatersWhen 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.
The Mudskippers
E12
The MudskippersThe Octonauts attempt to keep the peace amongst a trio of mudskippers whose home has been flooded.
The Harbour Seal
E13
The Harbour SealWhen Peso's patient, a remora fish, mysteriously disappears, the Octonauts enlist a unique undersea detective - a harbour seal.
The Lion's Mane Jellyfish
E14
The Lion's Mane JellyfishA lion's mane jellyfish gets its long and stingy tentacles tangled in the bubble engine, unintentionally flooding the Octopod and causing havoc.
The Red Rock Crabs
E15
The Red Rock CrabsWhen Shellington and the crew try to gather some skittish crabs who have drifted away from home, they get help from some old friends.
The Sea Sponge
E16
The Sea SpongeA sea sponge that houses other sea creatures in its pores suffers from a mysterious illness and Peso must figure out the cause.
The Immortal Jellyfish
E17
The Immortal JellyfishShellington and the Octonauts try to track an unusual creature: a jellyfish that can transform from old to young repeatedly - and live forever!
The Urchin Invasion
E18
The Urchin InvasionThe 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!
The Hammerhead Sharks
E19
The Hammerhead SharksThe 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.
The Loggerhead Sea Turtle
E20
The Loggerhead Sea TurtleAfter an undersea tremor separates the Gup-X and its crew, Barnacles seeks guidance from a mysterious sea turtle.
Cast of Season 3
Keith Wickham
Simon Greenall
Jo Wyatt
Rob Rackstraw
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