The Octonauts - Season 4 (2015)

As newborn baby sea turtles make their way to the ocean, the Octonauts must steer them clear a giant wave and hungry predators.

Barnacles' nephews Ursa and Orso are going to get their Polar Scout Badges, when they spot three walrus pups on a drifting floe which is on a crash-course with 2 icebergs. The pups are lost and too hungry to swim. Will Captain Barnacles be able to save them and finally earn the Walrus Rescue Badge - the only one he hasn't got?

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

The Octonauts find a humpback whale who's all alone because his voice is different from the other humpbacks'. They have to help him because if nobody understands him, he won't find the way to the feeding ground.

Peso gets washed up by a storm on a mysterious rocky island and discovers a group of insects thought to be extinct called tree lobsters.

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.

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

Kwazii adopts a baby alligator, but when it escapes the Octopod, he must rescue the tiny creature from ocean currents and hungry predators.

While diving down to the Midnight Zone, the Octonauts are attacked by bomber worms, and are enlisted to rescue an injured member of their troop.

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

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Dashi teams up with her little sister, Koshi, to solve a mysterious disappearance in a kelp forest.

Returning home from a mission along an African river, the Octonauts have trouble getting past a gang of large, territorial hippos.

The Octonauts wade through a swamp to find a lost flamingo chick before hungry predators do.

After Shellington crashes the Gup-D, he and Kwazii team up with a moray eel and grouper fish to pick up the pieces.

Tweak must help her friend Sandy the sea turtle escape a hungry tiger shark.

While exploring a dark and spooky cave, the Octonauts discover the fossil of a powerful, prehistoric fish - but it may be more than just a fossil.

When a mass of poisonous sea snakes get stranded on a beach, Peso and the Octonauts must somehow get them all back into the ocean.

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

Coconut Crisis: Kwazii and the Octonauts help their friends the coconut crabs discover who is stealing their coconuts. Sunfish: The Octonauts must help a giant sunfish who can't swim straight, before it hurts other sea creatures and itself.

The Great Swamp Search: The Octonauts journey to the Everglades to help Tweak's dad, Ranger Marsh, track down several invasive species - including a Burmese Python and her babies.

Coconut Crisis: Kwazii and the Octonauts help their friends the coconut crabs discover who is stealing their coconuts. Sunfish: The Octonauts must help a giant sunfish who can't swim straight, before it hurts other sea creatures and itself.

Captain Barnacles, Kwazii, and Peso are visiting The Polar Scout Emergency Post run by Tracker - a young polar bear trained by Captain Barnacles. Suddenly they receive a signal for help from a deserted research station on the opposite side of the world. Whoever could have sent the signal, the Octonauts have to answer it.