Season 4

September 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.

September 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!

September 30, 2015

The Octonauts must get 2 mantis shrimp to stop fighting before their powerful claw strikes destroy the Octopod.

October 1, 2015

The Octonauts follow a strange song to a lonely humpback whale.

October 2, 2015

When a storm washes Peso onto a mysterious, rocky island, he meets a band of lobster-like insects thought to be extinct.

December 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.

December 16, 2015

The Octonauts journey across a dangerous expanse of ice to help a penguin mother get back to her family.

December 3, 2016

When a population of crawfish is stricken by illness, the Octonauts race to find a cure.

December 4, 2016

The Octonauts find a lost flamingo chick separated from his family and they have to return him there before hungry alligators do!

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.

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.

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!

September 6, 2017

When surfing snails are swept out to sea, it's up to Dashi and the Octonauts to save them.

September 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.

September 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.

September 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.

October 23, 2017

While diving down to the Midnight Zone, the Octonauts are attacked by bomber worms.

October 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 the Octo-Alert.

October 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 their coconuts.

October 26, 2017

Kwazii adopts a baby alligator naming him Nipper, but when it escapes the Octopod, he and the Octonauts must rescue him.

October 27, 2017

The Octonauts struggle to save a pod of spinner dolphins who seem to be just swimming in their sleep.