| Season 4 | |
|---|---|
 | |
| Episodes: | 24 |
| Premiere: | September 23, 2015 |
| Finale: | June 14, 2016 |
| Next: | Season 5 |
| 1 | "The Octonauts and the Poison Dart Frogs" | 22 April , 2014 |
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The Octonauts meet a group of poison dart frogs after a dangerous tidal bore sweeps up the Amazon, depositing all the fish high up in the trees! However, luckily Tweak's new Gup, the Gup H, is ready to lend a hand. | ||
| 2 | "The Octonauts and the Hidden Lake" | 29 June , 2014 |
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When Barnacles, Kwazii, Peso and Shellington find a mysterious hidden lake underneath Antarctica, Shellington is eager to find some new undiscovered creatures living in the red water. But why is the lake red? And is there actually any creatures living down so deep in the ice? | ||
| 3 | "The Octonauts and the Octopod Mystery" | 25 Sep, 2015 |
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After the Octopod breaks down, Tweak knows that the only way to get the new part that she needs is to take a trip to the old Octopod. But they may not be alone in their abandoned ship... | ||
| 4 | "The Octonauts and the Baby Sea Turtles" | 28 Sep, 2015 |
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Some baby sea turtles need the Octonauts' help when a large wave threatens the island where the precious eggs are buried - not that they'll admit it! | ||
| 5 | "The Octonauts and the Walrus Pups" | 29, Sep 2015 |
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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. Will Captain Barnacles be able to save them and finally earn the Walrus Rescue Badge - the only one he hasn't got? | ||
| 6 | "The Octonauts and the Mantis Shrimp" | 30, Sep 2015 |
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The Octonauts have to stop a battle of two mantis shrimp, before they damage the Octopod with their powerful claws. | ||
| 7 | "The Octonauts and the Loneliest Whale" | 1, Oct 2015 |
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The Octonauts meet a humpback whale who's all alone because his voice is different from the other humpbacks and try to help him. | ||
| 8 | "The Octonauts and the Tree Lobsters" | 2, Oct 2015 |
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Peso gets washed up on a mysterious rocky island and discovers a group of insects thought to be extinct called tree lobsters. | ||
| 9 | "The Octonauts and the Convict Fish" | 14 Dec, 2015 |
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The Octonauts evacuate the creatures living around a reef before a large archway collapses. | ||
| Special | "Octonauts and the Operation Deep Freeze" | |
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The Octonauts are confused when they get a distress signal from a research station that was supposedly abandoned years ago. Curious they head off to Antarctica to investigate and find an old friend of Captain Barnacles there... | ||
| 10 | "The Octonauts and the Emperor Penguins" | 16, Dec 2016 |
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The Octonauts journey across a dangerous expanse of ice to help a penguin mother get back to her family. | ||
11: The Octonauts and the Baby Gator
Special: The Octonauts and the Great Swamp Search
12: The Octonauts and the Bomber Worms
13: The Octonauts and the Crawfish
14: The Octonauts and the Surfing Snails
15: The Octonauts and the Kelp Monster Mystery
16: The Octonauts and the Hippos
17: The Octonauts and the Flamingos
18: The Octonauts and the Operation Cooperation
19: The Octonauts and the Tiger Shark
20: The Octonauts and the Coelacanth
21: The Octonauts and the Yellow Bellied Sea Snakes
22: The Octonauts and the Spinner Dolphins
23: The Octonauts and the Sunfish
24: The Octonauts and the Coconut Crisis
