Season 4
24 episodes · Sep 23, 2015
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S4E1Octonauts and the Poison Dart Frogs
Sep 23, 201511mWhen 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.
S4E2Octonauts and the Hidden Lake
Sep 24, 201511mThe Octonauts are exploring Antarctica, when Shellington discovers strange microscopic creatures living under the ice.
S4E3Octonauts and the Octopod Mystery
Sep 25, 201511mWhen 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.
S4E4Octonauts and the Baby Sea Turtles
Sep 28, 201511mAs newborn baby sea turtles make their way to the ocean, the Octonauts must steer them clear a giant wave and hungry predators.
S4E5Octonauts and the Walrus Pups
Sep 29, 201511mCaptain 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!
S4E6Octonauts and the Mantis Shrimp
Sep 30, 201511mThe Octonauts must get 2 mantis shrimp to stop fighting before their powerful claw strikes destroy the Octopod.
S4E7Octonauts and the Loneliest Whale
Oct 1, 201511mThe Octonauts follow a strange song to a lonely humpback whale.
S4E8Octonauts and the Tree Lobsters
Oct 2, 201511mWhen a storm washes Peso onto a mysterious, rocky island, he meets a band of lobster-like insects thought to be extinct.
S4E9Octonauts and the Convict Fish
Dec 14, 201511mThe Octonauts evacuate the creatures living around a reef before a large archway collapses, but one stubborn convict fish refuses to move from her burrow.
S4E10Octonauts and the Emperor Penguins
Dec 16, 201511mThe Octonauts journey across a dangerous expanse of ice to help a penguin mother get back to her family.
S4E11Octonauts and the Crawfish
Dec 3, 201611mWhen a population of crawfish is stricken by illness, the Octonauts race to find a cure.
S4E12Octonauts and the Flamingos
Dec 4, 201611mThe Octonauts find a lost flamingo chick separated from his family and they have to return him there before hungry alligators do!
S4E13Octonauts and the Tiger Shark
May 27, 201711mWhen 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.
S4E14Octonauts and the Sunfish
May 28, 201711mWhen 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.
S4E15Octonauts and the Coelacanth
May 29, 201711mWhile 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!
S4E16Octonauts and the Surfing Snails
Sep 6, 201711mWhen surfing snails are swept out to sea, it's up to Dashi and the Octonauts to save them.
S4E17Octonauts and the Yellow Bellied Sea Snakes
Sep 13, 201711mWhen Peso gets stranded on a beach with a mass of poisonous snakes after a terrible storm, he and the Octonauts must somehow get them back to the ocean.
S4E18Octonauts and the Hippos
Sep 20, 201711mTrying to return home from a mission along an African river, the Octonauts have trouble getting past a gang of large, mud-splatting, territorial hippos.
S4E19Octonauts and Operation Cooperation
Sep 27, 201711mAfter Shellington crashes the GUP-D for the 3rd time, he and Kwazii team up with moray eels and grouper fish to help pick up the pieces and fix the vehicle before daylight occurs.
S4E20Octonauts and the Bomber Worms
Oct 23, 201711mWhile diving down to the Midnight Zone, the Octonauts are attacked by bomber worms.
S4E21Octonauts and the Kelp Monster Mystery
Oct 24, 201711mDashi teams up with her little sister Koshi to help the Octonauts solve a mysterious disappearance in the Kelp Forest. This is the second episode in which is unknown who sounded the Octo-Alert.
S4E22Octonauts and the Coconut Crisis
Oct 25, 201711mKwazii takes a vacation on Coconut Island where he gets hit by some coconuts. Then he and the Octonauts must help their old friends the Coconut Crabs discover who's stealing all their coconuts.
S4E23Octonauts and the Baby Gator
Oct 26, 201711mKwazii adopts a baby alligator naming him Nipper, but when it escapes the Octopod, he and the Octonauts must rescue him.
S4E24Octonauts and the Spinner Dolphins
Oct 27, 201711mThe Octonauts struggle to save a pod of spinner dolphins who seem to be just swimming in their sleep.