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Episodes

Season 1

Main article: Season 1
Seasons: 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9

This is the first season of the original Octonauts series. It premiered on October 4th, 2010 in the UK on CBeebies. The season contains 50 11-minute episodes, as well as two 22-minute specials.

This season debuts the Gup-A, Gup-B, Gup-C, Gup-D, and Gup-E, the five main Gups used primarily throughout the series. Also introduced is the Gup-F (The Speedy Sailfish), an unfinished prototype Gup, and the Gup-X (The Great Christmas Rescue), which is used frequently in following seasons.

Episodes

DISCLAIMER: The list provided on this article is based off of the episode order and descriptions provided by Netflix. This has been done to streamline the organization of the episodes on the wiki according to continuity and the main platform Octonauts can be streamed on at the moment. Despite this change, the original air dates listed will still be according to the premieres on CBeebies UK, with the BBC websites as a reference. Not all air dates have been fully retrieved, so this will update over time.

# Title Original Air Date
1 "The Undersea Storm" October 5th, 2010
It’s reef lobsters to the rescue when Kwazii’s Gup-B breaks down.
2 "The Giant Squid" October 11th, 2010
The Octonauts launch a determined search for an elusive giant squid.
3 "The Great Algae Escape" October 13th, 2010
The crew pursues crustaceans who’ve hijacked the Octopod.
4 "The Walrus Chief" October 7th, 2010
Captain Barnacles and Kwazii don walrus disguises to recover Peso’s stolen medical kit.
5 "The Flying Fish" October 8th, 2010
A school of flying fish takes off with Professor Inkling’s book.
6 "The Narwhal" October 26th, 2010
A narwhal comes to the Octonauts’ rescue when arctic ice grounds the Octopod.
7 "The Monster Map" October 19th, 2010
A treasure map leads the Octonauts to an incredible octopus.
8 "The Crab & Urchin" October 6th, 2010
The crew tries to help an urchin and a carrier crab get along.
9 "The Albino Humpback Whale" October 21st, 2010
An albino humpback whale comes to the Octonauts with a serious case of sunburn.
10 "The Remipedes" October 14th, 2010
A group of remipedes helps Shellington find his way out of a cave.
11 "The Orcas" October 12th, 2010
Fiddler crabs help the Octonauts get a beached orca back into the water.
12 "The Blobfish Brothers" October 18th, 2010
The crew tries to get three blobfish to safety before a volcano blows.
13 "The Decorator Crab" November 5th, 2010
A decorator crab with sticky fingers has been taking the Octonauts’ things to outfit his shell.
14 "The Whale Shark" October 4th, 2010
Dashi winds up inside a whale shark.
15 "The Cookiecutter Sharks" December 13th, 2010
The Octonauts trace their ruined equipment to a trio of cookiecutter sharks.
16 "The Jellyfish Bloom" December 16th, 2010
Shellington gets caught in a huge jellyfish bloom.
17 "The Speedy Sailfish" October 15th, 2010
Life’s like an undersea rodeo when Barnacles and Kwazii ride some sailfish.
18 "The Vampire Squid" December 8th, 2010
Peso travels to the “Midnight Zone” where he meets a vampire squid.
19 "The Humuhumus" February 10th, 2011
Fear drives a school of humuhumu fish into the Octopod’s waterworks.
20 "The Giant Spider Crab" February 11th, 2011
Kwazii mistakes an enormous spider crab for an actual spider.
21 "The Giant Kelp Forest" October 22nd, 2010
The Octonauts must trek through a kelp forest to find their Gup-B sub.
22 "The Hermit Crab" November 2nd, 2010
Tweak and Peso try to help a hermit crab come out of his shell.
23 "The Hungry Pilot Fish" December 7th, 2010
A hungry pilot fish comes in handy when the Octonauts run into a whitetip shark.
24 "The Beluga Whales" December 6th, 2010
Music is the key to saving a pod of stranded beluga whales.
25 "The Snot Sea Cucumber" October 29th, 2010
The captain gets creative when a snot sea cucumber invades the Octopod.
26 "The Giant Whirlpool" November 1st, 2010
The Octonauts race to save a leatherback sea turtle from a giant whirlpool.
27 "The Slime Eels" January 26th, 2011
Slime eels stand between Kwazii and pirate treasure.
28 "The Arctic Orcas" January 25th, 2011
Orcas come to the rescue when Captain Barnacles and Peso are lost in the Arctic Sea.
29 "The Lost Sea Star" October 20th, 2010
The Octonauts comb the ocean to help a lost sea star find its home.
30 "The Giant Jelly" December 10th, 2010
Peso needs a helping hand when he gets caught in a giant comb jelly.
31 "The Snapping Shrimp" October 28th, 2010
The Octonauts cross paths with a snapping shrimp.
32 "The Kelp Forest Rescue" November 4th, 2010
Peso’s little brother, Pinto, shadows him on a rescue mission to save Shellington and Dashi.
33 "The Enormous Elephant Seal" January 27th, 2011
The Octonauts let an elephant seal molt inside the Octopod.
34 "The Sardine School" January 28th, 2011
The Octonauts help a lost sardine who’s looking for her school.
35 "The Eel Ordeal" February 1st, 2011
A migrating young eel needs the Octonauts’ assistance on her journey upriver.
36 "The Dolphin Reef Rescue" January 31st, 2011
The Octonauts team with dolphins to save a sickly coral reef.
37 "The Pirate Parrotfish" February 4th, 2011
While seeking pirate treasure, the Octonauts meet a parrotfish.
38 "The Electric Torpedo Rays" February 7th, 2011
Electric torpedo rays help the Octonauts jump-start a powerless Octopod.
39 "The Midnight Zone" October 27th, 2010
The Octonauts explore the “Midnight Zone” and discover a new worm species.
40 "The Mixed Up Whales" November 3rd, 2010
The crew comes between two blue whales who are trying to communicate.
41 "The Seahorse Tale" December 9th, 2010
The Octonauts try to help a seahorse find its missing mate, who is about to give birth.
42 "The Enemy Anemones" October 25th, 2010
The crew becomes caught between two groups of anemones.
43 "The Crafty Cuttlefish" February 8th, 2011
A cuttlefish that can change shape has stolen Captain BarnaclesOctocompass.
44 "The Lost Lemon Shark" February 9th, 2011
The Octonauts help a lemon shark find his way back home.
45 "The Baby Dolphin" December 17th, 2010
Kwazii looks after a baby dolphin who follows him home.
46 "The Scary Spookfish" January 24th, 2011
The Octonauts meet a see-through spookfish while trying to rescue Peso from a trench.
47 "The Oarfish" December 14th, 2010
Dashi takes a picture of an oarfish that’s unbelievably long.
48 "The Combtooth Blenny" December 15th, 2010
A shipwrecked Peso and Kwazii meet a fish who can walk on land.
49 "The Marine Iguanas" February 2nd, 2011
Ravenous marine iguanas devour all the Octonauts’ seaweed.
50 "The Dwarf Lanternshark" February 3rd, 2011
The Octonauts come to the aid of an injured dwarf lanternshark.
51 "The Great Penguin Race" December 13th, 2010
With his friends cheering him on, Peso competes in the annual Iron Clam Competition and goes up against a formidable adversary.
52 "The Great Christmas Rescue" December 1st, 2011
Professor Inkling invites the Octonauts to his childhood home for the holidays, only to find out that his octopus nephew is now endangered.

Season 2

A second series of 22 episodes started on 19 November 2012 on the UK's CBeebies channel[13] but was halted with no explanation after 10 episodes leading to criticism from viewers.[14] Broadcasts resumed in March 2013 but stopped a week later (with the last 6 episodes still unaired) - then resumed again in September 2013.

# Title Original air date
1 "Octonauts and the Colossal Squid" 19 November 2012
The Octopod is grabbed by a Colossal Squid which drags it down into the depths. The Octonauts are unable to break free due to the hooks on the ends of the Squid's tentacles. Fortunately the arrival of some sperm whales turns the squid from hunter to hunted. 
2 "Octonauts and the Adelie Penguin" 20 November 2012
Kwazii and Peso have to babysit some adelie penguin chicks whilst their parents go hunting for fish. Captain Barnacles uses the Gup-C's icebreaking powers to get them home when an iceberg blocks the way. 
3 "Octonauts and the Coconut Crabs" 21 November 2012
Kwazii is driving the GUP-B when a school of flying fish comes around and he is gliding with the fish Kwazii notices he is hit by a coconut and it has the symbol of his grandfather Calico Jack so then Kwazii, Captain Barnacles, Peso, and Tweak get a family of coconut crabs to help him open it. 
4 "Octonauts and the Great White Shark" 22 November 2012
Peso narrowly escapes when a hungry great white shark tries to eat him. Despite this he wants to help it after it injures its fin against the Octopod. The Octonauts use the Gup-X to turn the shark upside down and induce tonic immobility whilst Peso bandages it, but it comes round and in the end they escape by feeding it Tunip's fish biscuits to satisfy its hunger. 
5 "Octonauts and the Sea Snakes" 23 November 2012
Dashi discovers that the Octopod is being threatened by a whirlpool and then Tunip later sees that there are some strange objects in the Garden Pod so he goes and gets Shellington and he later sees that they are sea krait eggs. The Octonauts try to find all the snakes so they won't get sucked into the whirlpool. Then the Octonauts later discover that one of the snakes is missing the Octonauts venture throughout the Octopod to find it. The snake ends up in HQ and reversing the ship and the octopod gets sucked into the whirlpool. 
6 "Octonauts and the Bowhead Whales" 26 November 2012
Captain Barnacles' old friend Boris the narwhal and his narwhal mates (see Series 1, episode 17) are trapped under the Arctic ice. After failing to rescue them with the Gup-C's icebreaker and the GUP-D's drill, they enlist the help of some bowhead whales whose massive heads can break through thick ice. 
7 "Octonauts and the Jawfish" 27 November 2012
A jawfish father has lost the eggs he was brooding. 
8 "Octonauts and the Porcupine Pufferfish" 28 November 2012
The Octonauts venture inside a whale shark again (see Series 1, episode 1), this time to rescue a porcupine puffer fish
9 "Octonauts and the Damselfish" 29 November 2012
Some algae-eating fish need help dealing with damselfish that chase them off the algae they are farming. 
10 "Octonauts and the Scared Sperm Whale" 30 November 2012
Peso tries to help a young sperm whale overcome his fear of deep diving, an ability it must later use to rescue Peso when he gets caught by a giant clam on the seabed. 
11 "Octonauts and the Long-armed Squid" 11 March 2013
Peso and Kwazii search a creepy shipwreck in the midnight zone, looking for an injured creature that their friend the vampire squid(see Series 1, episode 28) has heard moaning in the dark. Peso soon finds an injured angler fish but the real source of the moaning turns out to be a long-armed squid, a strange ghostly white creature with elbows in its extraordinarily long tentacles, one of which has become trapped in the timbers of the wreck. 
12 "Octonauts and the Fiddler Crabs" 12 March 2013
The Octopod's periscope breaks off during a storm and lands up on a beach, lost amongst other marine debris. The Octonauts clean up the beach whilst searching for the periscope but a resident colony of fiddler crabs mistake the Gup-D and its claw gestures for a hostile giant crab and attack. The Gup-D goes haywire with a fiddler crab at the controls and burrows under the beach causing a sink hole to appear which almost swallows them all up. In the end the crabs fill the hole in with the sand balls they regurgitate whilst feeding. 
13 "Octonauts and the Manta Rays" 13 March 2013
A young manta ray needs help finding the secret manta ray feeding grounds. 
14 "Octonauts and the Swashbuckling Swordfish"

"Octonauts and the Flying Swords" (US title)[citation needed]

14 March 2013
When Kwazii sees what seem to be three flying swords under the Pirate's Moon, he embarks on a quest to find the Sword of the Pirate King, which legend says is on a wreck guarded by magical flying swords. The "flying swords" turn out to have been swordfish, which love jumping out of the water, but the pirate sword proves to be real. Meanwhile the others are led on a wild goosechase into a kelp forest following the pirate wreck's drifting figurehead, a carving of a pirate cat, which they mistake for Kwazii. 
15 "Octonauts and the Triggerfish" 15 March 2013
The Octonauts' floating temperature sensors alert them to a risk of waterspouts due to a rise in sea surface temperature so they decide to retrieve the devices for safe-keeping. But Kwazii gets into an argument with a possessive triggerfish which has adopted one of the devices as its home, and they both get carried away by a waterspout. Kwazii ends up having to defend the fish from a seabird and a swordfish that want to eat it. Luckily the characteristic grunting sounds that triggerfish make when distressed enables the other Octonauts to locate them. 
16 "Octonauts and the Mimic Octopus" 13 May 2013
Peso is gathering red algae to cure the sick Vegimals but needs the shapeshifting skills of a Mimic Octopus to scare off a Moray eel by using its striped tentacles to pretend to be a group of poisonous sea snakes
17 "Octonauts and the Lionfish" 14 May 2013
Invasive Lionfish are damaging coral reefs in the Atlantic Ocean and need taking back to their native Pacific Ocean
18 "Octonauts and the Leafy Sea Dragons" 15 May 2013
Some leafy sea dragons accidentally get into the Octopod. 
19 "Octonauts and the Manatees" 16 May 2013
After his Gup is struck by lightning, Captain Barnacles gets trapped by a giant clam but doesn't call for help as he wants the others to go help some manatees at risk from a thunderstorm. 
20 "Octonauts and the Saltwater Crocodile" 17 May 2013
An enormous Australian saltwater crocodile is lost in the Antarctic Ocean and needs taking home. 
21 "Octonauts and the Humphead Parrotfish" 2 September 2013
The Octonauts use magnets and a humphead parrotfish to try to stop a large meteor that's heading towards the Octopod. 
22 "Octonauts and the Gulper Eels" 3 September 2013
Hungry gulper eels as well as undersea tremors threaten Inkling and Kwazii and get trapped by boulders. So Dashi uses Tweak's newly built "Octo Mach-Suit" to rescue Inkling and Kwazii. 

Season 3

A third series of 22  episodes started being broadcast by CBeebies on 4 September 2013.[15]

Note: Two new episodes called Octouants & the Queensland Lungfish & Octouants & the Meaglodon were on Wikipedia of Octouants!.

# Title Original air date
1 "Octonauts and the Siphonophore" 4 September 2013
Kwazii and Dashi become entangled in a strange deep-sea creature - a siphonophore - and when a geyser blasts it toward the surface, the Octonauts must stop its ascent before it bursts. 
2 "Octonauts and the Water Bears" 5 September 2013
The Octonauts venture into a dangerous red-hot lava tube to rescue a teeny tiny water bear
3 "Octonauts and the Cone Snail" 6 September 2013
Only Peso can save the day when a cone snail invades the Octopod and tranquilizes the crew one by one with its dangerous venom-filled harpoons. 
4 "Octonauts and the Artificial Reef" 9 September 2013
When an underwater hurricane destroys a small reef, which a frogfish and other creatures depend on, Tweak and the crew must convert the recently destroyed Gup-F into an artificial reef before the second stage of the hurricane strikes! 
5 "Octonauts and the Humpback Whales" 10 September 2013
When a sardine swallows the key to a treasure chest, a humpback whale helps Kwazii track it down. 
6 "Octonauts and the Pelicans" 11 September 2013
When a floating garbage patch endangers a flock of pelicans and other sea creatures, the Octonauts and the birds work together to clean it up. 
7 "Octonauts and the Sea Pigs" 12 September 2013
The Octonauts must stop a huge herd of sea pigs before they march blindly into the Mariana Trench - the deepest point on earth! 
8 "Octonauts and the Yeti Crab" 13 September 2013
As Tweak tests the Gup-X deep down in the Midnight Zone, a yeti crab cuts a vital electrical wire in the ship and cuts off all power, endangering itself and the Octonauts. 
9 "Octonauts and the Barracudas" 10 March 2014
Shellington and the Vegimals are on a mission to replant a mangrove forest, but some hungry barracudas make the job pretty hard. 
10 "Octonauts and the Duck-Billed Platypus" 11 March 2014
While rescuing river creatures after a storm, the Octonauts find a strange egg. 
11 "Octonauts and the Sea Skaters" 12 March 2014
When Kwazii gets lost at sea aboard the tiny octo-ski, he meets a flotilla of sea skaters
12 "Octonauts and the Mudskippers" 13 March 2014
The Octonauts attempt to keep the peace amongst a trio of mudskippers whose home has been flooded. 
13 "Octonauts and the Harbour Seal" 14 March 2014
When Peso's patient, a remora fish, mysteriously disappears, the Octonauts enlist a unique undersea detective - a harbour seal
14 "Octonauts and the Lion's Mane Jellyfish" 17 March 2014
An enormous Lion's Mane jellyfish gets its amazingly long tentacles tangled in the Octopod's engine whilst Tweak is working on it. 
15 "Octonauts and the Red Rock Crabs" 18 March 2014
Shellington and the others round up some lost red rock crabs and marine iguanas that have got marooned on an island far too cold for them and take them home to the Galapagos Islands
16 "Octonauts and the Sea Sponge" 19 March 2014
Examining a sick sea sponge, Peso is surprised to discover that all sorts of creatures live inside it, treating it like a hotel, a behaviour known as commensalism
17 "Octonauts and the Immortal jellyfish" 20 March 2014
While caring for sea creatures, Peso discovers an adult Immortal Jellyfish that changes into a baby when it was scared by predators. Captain Barnacles, Kwazii and Peso guard the jellyfish at a distant reef, so Shellington rushes to photograph it, damaging the Gup-E and booster packs in the process. 
18 "Octonauts and the Urchin Invasion" 21 March 2014

Kelp-eating red sea urchins attack a kelp forest. The Octonauts are helped by Shellingtons's sister, Pearl, another sea otter and scientist. 

Season 4

# Title Original air date
1 "Octonauts and the Poison Dart Frogs" 23 September , 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.

2

"Octonauts and the Hidden Lake"

 24 September , 2015

The Octonauts are exploring antarctica, When Shellington discovers strange microscopic creatures living under the ice.

3

"Octonauts and the Octopod Mystery"

 25 September , 2015

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 "Octonauts and the Baby Sea Turtles" 28 September 2015
As newborn baby sea turtles make their way to the ocean, the Octonauts must help them avoid predators when a large wave threatens the island where the precious eggs are buried - not that they'll admit it!
5 "Octonauts and the Walrus Pups" 29 September 2015
Captain Barnacles' niece and nephew Ursa and Orson 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 two icebergs. Will Captain Barnacles be able to save them and finally earn the Walrus Rescue Badge - the only one he hasn't got?
6 "Octonauts and the Mantis Shrimp" 30 September 2015
The Octonauts must get two mantis shrimp to stop fighting before their powerful claw strikes destroy the Octopod.
7 "Octonauts and the Loneliest Whale" 1 October 2015
The Octonauts follow a strange song to a lonely humpback whale who is alone because he does not sound like the other whales! They have to help him because if nobody understands him, he won't find the way to the feeding ground.
8 "Octonauts and the Tree Lobsters" 2 October 2015
A storm washes Peso onto a mysterious, rocky island where he meets a band of lobster-like insects thought to be extinct. But he and the Octonauts must catch a baby tree lobster that ended up in the Octopod and bring him back to Balls Pyramid.
9 "Octonauts and the Convict Fish" 14 December 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!
10 "Octonauts and the Emperor Penguins" 16 December 2015
The Octonauts journey across a dangerous expanse of ice to help a penguin mother get back to her family, but they lose contact along the way.
11 "Octonauts and the Baby Gator" 14 March 2016

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

12 "Octonauts and the Bomber Worms" 14 March 2016

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

13 "Octonauts and the Crawfish" 22 March 2016

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

14 "Octonauts and the Surfing Snails" 22 March 2016

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

15 "Octonauts and the Flamingos" 4 April 2016

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

16 "Octonauts and the Operation Cooperation" 4 April 2016

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.

17 "Octonauts and the Kelp Monster Mystery" 4 June 2016

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.

18 "Octonauts and the Yellow Bellied Sea Snakes" 5 June 2016

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.

19 "Octonauts and the Coconut Crisis" 6 June 2016

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.

20 "Octonauts and the Coelacanth" 7 June 2016

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!

21 "Octonauts and the Tiger Shark" 8 June 2016

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.

22 "Octonauts and the Hippos" 9 June 2016

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.

23 "Octonauts and the Spinner Dolphins" 13 June 2016

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

24 "Octonauts and the Sunfish" 14 June 2016

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.

Special Episodes

# Title Original air date
1 "Octonauts and the Great Penguin Race" 13 December 2010
Peso is going home to Antarctica to watch an annual penguin triathlon, the Iron Clam Competition, but learns to his dismay that his little brother Pinto has entered him in it. Peso will have to slide, dive and swim his way to victory, against the annual athletic winner, Hugo. 
2 "Octonauts and the Great Christmas Rescue" 24 December 2011
The Octonauts travel for Christmas to Professor Inkling's childhood home, a seamount, but soon get involved in a rescue mission when a rockslide endangers a rare 500 year-old golden coral and traps Professor Inkling's nephew Squirt. They also learn about Christmas tree worms which live in holes in rocks. Crucial to completing the mission is the new heavy-duty vehicle Gup-X which Tweak has built as an early present for Captain Barnacles. 
3 "Octonauts and the Amazon Adventure" 1 January 2013
Kwazii enters a shipwreck to get Calico Jack's map to an underwater city of gold. This leads the octonauts up the Amazon River, past parrotsfreshwater stingrayscaiman and manatees. But a falling tree traps the Gup-A, and a tidal bore comes up the river, scattering the octonauts. Captain Barnacles looks for the others with the aid of a river dolphin and its echolocation abilities. The octonauts help an electric eel, a strandedarapaima, and get chased by piranhas. But a wood-eating panaque frees the trapped Gup-A. Meanwhile Kwazii has been saved by Calico Jack who turns out to be alive, but lost his ship after an attack by fire antsand an anaconda. His incomplete map had led him in circles, but Kwazii's piece completes it so they can finish the quest. After being blocked by hostile capybaras, they are reunited with the others in time to fight off more anacondas. Finally the "city of gold" turns out to be a colony of golden freshwater sponges in the bottom of a pool! 
4 "The Mariana Trench Adventure" 27 May 2013
The Octonauts assemble Tweak's new Deep Sea Octolab and lower it to the deepest part of the ocean, the Mariana Trench, where Shellington and Dashi intend to study the sealife. Whilst the Octonauts are setting up the base it is invaded by some giant isopods and other creatures which are looking for a new hydrothermal vent to live around. They also observe some sea cucumbers and luminous sea stars, and whilst chasing an out of control Octobot robot, Kwazii has to avoid undersea mud volcanoes which have created a lake of hot mud on the seafloor and lava. 
5 "Octonauts and a Very Vegimal Christmas" 10 December 2013
When all of the Octonauts are trapped in a dangerous blob of Marine Mucilage, the Vegimals must step up and build a new Gup called the Gup-V to rescue the crew in time for the Christmas meal! 
6 "The Over, Under Adventure" 14 March 2014

The Octonauts' mission to explore Antarctica during which they marvel at sea tulips and hourglass dolphins becomes a desperate rescue as a group of sea stars and urchins are threatened by a brinicle - a rare underwater icicle that can freeze creatures on the sea bed. So the crew use the recently built GUP-S to save the day, with the help of a Weddell seal

7 "Octonauts and the Great Swamp Search" 28 March 2016

Tweak and the Octonauts go to The Everglades to visit her dad, Ranger Marsh and help him rescue some non-native creatures before a storm hits. The team's recently built Gup-K is also there to save the day.

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