Octonauts: Season 4
Season 4 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 3.
- 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 4 Progress Shield
Octonauts and the Poison Dart Frogs
Sep 23, 2015
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.
Octonauts and the Hidden Lake
Sep 24, 2015
The Octonauts are exploring Antarctica, when Shellington discovers strange microscopic creatures living under the ice.
Octonauts and the Octopod Mystery
Sep 25, 2015
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.
Octonauts and the Baby Sea Turtles
Sep 28, 2015
As newborn baby sea turtles make their way to the ocean, the Octonauts must steer them clear a giant wave and hungry predators.
Octonauts and the Walrus Pups
Sep 29, 2015
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!
Octonauts and the Mantis Shrimp
Sep 30, 2015
The Octonauts must get 2 mantis shrimp to stop fighting before their powerful claw strikes destroy the Octopod.
Octonauts and the Loneliest Whale
Oct 1, 2015
The Octonauts follow a strange song to a lonely humpback whale.
Octonauts and the Tree Lobsters
Oct 2, 2015
When a storm washes Peso onto a mysterious, rocky island, he meets a band of lobster-like insects thought to be extinct.
Octonauts and the Convict Fish
Dec 14, 2015
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.
Octonauts and the Emperor Penguins
Dec 16, 2015
The Octonauts journey across a dangerous expanse of ice to help a penguin mother get back to her family.
Octonauts and the Crawfish
Dec 3, 2016
When a population of crawfish is stricken by illness, the Octonauts race to find a cure.
Octonauts and the Flamingos
Dec 4, 2016
The Octonauts find a lost flamingo chick separated from his family and they have to return him there before hungry alligators do!
Octonauts and the Tiger Shark
May 27, 2017
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.
Octonauts and the Sunfish
May 28, 2017
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.
Octonauts and the Coelacanth
May 29, 2017
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!
Octonauts and the Surfing Snails
Sep 6, 2017
When surfing snails are swept out to sea, it's up to Dashi and the Octonauts to save them.
Octonauts and the Yellow Bellied Sea Snakes
Sep 13, 2017
When 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.
Octonauts and the Hippos
Sep 20, 2017
Trying to return home from a mission along an African river, the Octonauts have trouble getting past a gang of large, mud-splatting, territorial hippos.
Octonauts and Operation Cooperation
Sep 27, 2017
After 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.
Octonauts and the Bomber Worms
Oct 23, 2017
While diving down to the Midnight Zone, the Octonauts are attacked by bomber worms.
Octonauts and the Kelp Monster Mystery
Oct 24, 2017
Dashi 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 th
Octonauts and the Coconut Crisis
Oct 25, 2017
Kwazii 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 th
Octonauts and the Baby Gator
Oct 26, 2017
Kwazii adopts a baby alligator naming him Nipper, but when it escapes the Octopod, he and the Octonauts must rescue him.
Octonauts and the Spinner Dolphins
Oct 27, 2017
The Octonauts struggle to save a pod of spinner dolphins who seem to be just swimming in their sleep.