Seasons & episodes
S3 · E12The Mudskippers 2014-03-13 · 11 min
The Octonauts attempt to keep the peace amongst a trio of mudskippers whose home has been flooded.
S3 · E13The Harbour Seal 2014-03-14 · 11 min
When Peso's patient, a remora fish, mysteriously disappears, the Octonauts enlist a unique undersea detective - a harbour seal.
S3 · E14The Lion's Mane Jellyfish 2014-03-17 · 11 min
A lion's mane jellyfish gets its long and stingy tentacles tangled in the bubble engine, unintentionally flooding the Octopod and causing havoc.
S3 · E15The Red Rock Crabs 2014-03-18 · 11 min
When Shellington and the crew try to gather some skittish crabs who have drifted away from home, they get help from some old friends.
S3 · E16The Sea Sponge 2014-03-19 · 11 min
A sea sponge that houses other sea creatures in its pores suffers from a mysterious illness and Peso must figure out the cause.
S3 · E17The Immortal Jellyfish 2014-03-20 · 11 min
Shellington and the Octonauts try to track an unusual creature: a jellyfish that can transform from old to young repeatedly - and live forever!
S3 · E18The Urchin Invasion 2014-03-21 · 11 min
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!
S3 · E19The Hammerhead Sharks 2015-09-21 · 11 min
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.
S3 · E20The Loggerhead Sea Turtle 2015-09-22 · 11 min
After an undersea tremor separates the Gup-X and its crew, Barnacles seeks guidance from a mysterious sea turtle.
S4 · E1Octonauts and the Poison Dart Frogs 2015-09-23 · 11 min
When a giant wave hurls Amazon River creatures up into the trees, the Octonauts must get them down safely, without disturbing poison dart frogs who live there.
S4 · E2Octonauts and the Hidden Lake 2015-09-24 · 11 min
The Octonauts are exploring Antarctica, when Shellington discovers strange microscopic creatures living under the ice.
S4 · E3Octonauts and the Octopod Mystery 2015-09-25 · 11 min
When the Octopod breaks down, Tweak and the crew search for a missing part aboard an abandoned prototype of the ship, not realising something lives there.
S4 · E4Octonauts and the Baby Sea Turtles 2015-09-28 · 11 min
As newborn baby sea turtles make their way to the ocean, the Octonauts must steer them clear a giant wave and hungry predators.
S4 · E5Octonauts and the Walrus Pups 2015-09-29 · 11 min
Captain Barnacles and his niece and nephew, Ursa and Orson, must rescue walrus pups who are stranded on a runaway ice floe, before it collides with a huge iceberg!
S4 · E6Octonauts and the Mantis Shrimp 2015-09-30 · 11 min
The Octonauts must get 2 mantis shrimp to stop fighting before their powerful claw strikes destroy the Octopod.
S4 · E7Octonauts and the Loneliest Whale 2015-10-01 · 11 min
The Octonauts follow a strange song to a lonely humpback whale.
S4 · E8Octonauts and the Tree Lobsters 2015-10-02 · 11 min
When a storm washes Peso onto a mysterious, rocky island, he meets a band of lobster-like insects thought to be extinct.
S4 · E9Octonauts and the Convict Fish 2015-12-14 · 11 min
The Octonauts evacuate the creatures living around a reef before a large archway collapses, but one stubborn convict fish refuses to move from her burrow.
S4 · E10Octonauts and the Emperor Penguins 2015-12-16 · 11 min
The Octonauts journey across a dangerous expanse of ice to help a penguin mother get back to her family.
S4 · E11Octonauts and the Crawfish 2016-12-03 · 11 min
When a population of crawfish is stricken by illness, the Octonauts race to find a cure.
S4 · E12Octonauts and the Flamingos 2016-12-04 · 11 min
The Octonauts find a lost flamingo chick separated from his family and they have to return him there before hungry alligators do!
S4 · E13Octonauts and the Tiger Shark 2017-05-27 · 11 min
When a hungry tiger shark eats the camera that Tweak's turtle friend Sandy gets in the Octopod, she and the Octonauts must rescue her before it eats everything in its path.
S4 · E14Octonauts and the Sunfish 2017-05-28 · 11 min
When a huge sunfish enters the GUP-E, Peso and Kwazii must somehow get the large fish out of the Gup. Eventually they find out it's a Sunfish a fish with no fins.
S4 · E15Octonauts and the Coelacanth 2017-05-29 · 11 min
While exploring a dark and spooky cave, The Octonauts find a strange fossil of a powerful prehistoric fish... but it may be more than just a fossil!