Octonauts: Season 3
Season 3 Lore Primer
Key plot threads, lore context, and character stakes you need to remember before diving into this season.
- Directly follows the overarching narrative developments of Octonauts Season 2.
- Faction dynamics and core character alliances shift under escalating external stakes.
- Crucial mysteries introduced previously reach key turning points and narrative reckonings.
- Sets up serialized story arcs that build directly toward the climactic season finale.
Episode Guide
Season 3 Progress Shield
The Siphonophore
Sep 4, 2013
Kwazii and Dashi become entangled in a strange deep-sea creature - a siphonophore.
The Water Bears
Sep 5, 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.
The Cone Snail
Sep 6, 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.
The Artificial Reef
Sep 9, 2013
When an underwater storm destroys a small reef, Tweak and her crew try to convert the Gup-F into an artificial equivalent.
The Humpback Whales
Sep 10, 2013
When a sardine swallows the key to a treasure chest, a humpback whale helps Kwazii track it down.
The Pelicans
Sep 11, 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.
The Sea Pigs
Sep 12, 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 mi
The Yeti Crab
Sep 13, 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.
The Barracudas
Mar 10, 2014
Shellington and the Vegimals' mission to replant a mangrove forest is put in peril by a school of toothy barracudas.
The Duck-Billed Platypus
Mar 11, 2014
While rescuing river creatures after a storm, the Octonauts find a strange egg and come under attack by stinging platypuses.
The Sea Skaters
Mar 12, 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.
The Mudskippers
Mar 13, 2014
The Octonauts attempt to keep the peace amongst a trio of mudskippers whose home has been flooded.
The Harbour Seal
Mar 14, 2014
When Peso's patient, a remora fish, mysteriously disappears, the Octonauts enlist a unique undersea detective - a harbour seal.
The Lion's Mane Jellyfish
Mar 17, 2014
A 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
Mar 18, 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.
The Sea Sponge
Mar 19, 2014
A 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
Mar 20, 2014
Shellington 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
Mar 21, 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 urc
The Hammerhead Sharks
Sep 21, 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 lo
The Loggerhead Sea Turtle
Sep 22, 2015
After an undersea tremor separates the Gup-X and its crew, Barnacles seeks guidance from a mysterious sea turtle.