The Octonauts shipwreck on a desert coast and meet water scientist monkey Paani, who leads them to thirsty animals in need of major hydration.
During a volcanic eruption in Iceland, a volcano begins melting the ice of the glacier sitting on top of it, threatening to flood a valley below and take out 2 reindeer herds unless Dashi, Peso and Paani can evacuate them.
Kwazii sets off to assist Calico Jack in taking a group of bombardier beetles to a new island home, but they have to find the group's scout first, and he is proving difficult to catch.
After a delivery run to ferry supplies to Professor Natquik in Antarctica, Dashi must fly to a tropical island with Peso and Tweak in tow to help Kwazii and Pete rescue Calico Jack from a pile of trees. However, Dashi has to fly through a fierce windstorm first.
Paani loses his soil sampling pole while doing research in Siberia with Professor Inkling. When Dashi and Peso arrive, the group discovers a Siberian Salamander frozen in ice, and after she wakes up, all present are in danger, with underground methane deposits beginning to blow.
Paani rescues a Bailey's snake from a mudflow in the Himalayan Mountains and calls for backup, which arrives in the form of Dashi, Tweak and Tunip in the new Terra-Gup 1. The group now has to find the snake a new hot spring to call home.
After the Nevada desert gets hit by an earthquake from Alaska, Pearl calls for backup to help clear rocks off an algae patch in Devil's Hole so that the pupfish can access their food. Peso, Dashi, and Shellington arrive to help, but the severity of the situation very quickly rises.
Towards the end of their Australian vacation, Dashi and Koshi receive a weather warning and begin evacuating the local area before a flash flood hits. But after helping 2 kangaroos and a bearded dragon, the duo have to find a pregnant desert crab.
Dashi and Paani head off for Antarctica to help Professor Natquik investigate the possibility of running water in Antarctica. However, when a lost skua comes into the picture, Paani and the misplaced seabird have to rely on Natquik and Dashi for a rescue.
Dashi and Min discover a group of Quino Checkerspot caterpillars while mapping a valley, but while the bugs nap until more plantains grow, the 2 must move them and keep them safe with the help of Shellington and Tunip.
Peso's little brother Pinto must return home from his stay with the Octonauts, but while attempting to help Dashi, he becomes distracted, which becomes problematic when both she and Paani get stuck in a boiling sulfur pool in Yellowstone Park.
Paani calls in for backup when a rockslide begins in the Rocky Mountains, which arrives in the form of Barnacles, Tweak, and a few Vegimals in the new Terra-Gup 2. Unfortunately, they have to evacuate some stubborn mountain goats who are not keen on leaving.
Barnacles, Dashi, and the Vegimals set off to help Min relocate a giant panda who just ate up an entire bamboo grove in China. Unfortunately, things get complicated when a second one shows up halfway to the bamboo.
Dashi, Paani, and Tweak follow a developing hurricane to track its direction. When they reveal that the storm is heading for the Florida Everglades, however, the Octo-Ray gets caught in the fierce winds, preventing them from assisting Ranger Marsh.
While the Octonauts are clearing up an island after a tropical storm, the Vegimals attempt to help a misplaced goby return to his home pond. Kwazii soon shows up to help, especially when a hungry bird comes after the goby.
Kwazii joins Tracker in a survival test in the Sahara Desert. However, a young golden mole and Kwazii's misplacement of their supplies mean that they quickly encounter problems when a sandstorm hits.
Paani, Shellington, and Kwazii search New Zealand for a weta in trouble, but after 3 duds discover that the endangered weta is a Tasman Lake Giant Weta, one who is in danger of being eaten by hungry rats.
Paani discovers a nest of dormice that have prematurely woken from their hibernation, but when Shellington and Tweak arrive to help, all three have to hurry before the dormice get caught by a hungry weasel.
While examining the results of coastal erosion on an island's shoreline, Kwazii, Tracker, and Calico Jack have to reunite a Harlequin Duck mother with her wayward nest. Unfortunately, a clever and hungry raven manages to fool Calico Jack and steal an egg.
While on a spelunking expedition in the Hang Son Doong caves, Kwazii, Shellington, and Ryla get trapped when an unexpected rainstorm hits and are trapped with an Indochinese tiger.
Tweak, and Dashi set off to help Ranger Marsh track down a turtle egg that vanished after a swamp fire, narrowing the suspect down to a misplaced nine-banded armadillo.
After Paani gets swept up by a river flood in a rainforest downpour, Dashi and Tweak arrive to check on him and discover a colony of fire ants doing so. Unfortunately, the insects climb onto the Octo-Ray while a bigger storm is approaching.
Peso and Dashi get stranded in the Australian wilderness after the Octo-Ray overheats while cooling off some flying foxes. However, they must hurry to help a flying fox mother and her baby, who is drastically overheating by the minute.
Peso and Tunip are helping to feed a colony's new pufflings while Kwazii tries to fend off a seagull until Barnacles returns with some missing puffins.
While responding to Paani after losing contact with him, Peso, Tweak, and Tunip have to stay with him until a lightning storm passes so Dashi can pick them up. Unfortunately, Tunip gets stuck in a landslide, but the others receive help in the form of a neighboring giant pangolin.
Min and the team save a crowded tree hotel from an itchy bear.
The agents must convince some albatrosses to leave their sinking island for somewhere new.
A honey badger chases away other animals from a watering hole.
Cute pikas must move to higher ground when a glacier starts melting faster than usual.
The weather’s starting to freeze, but the critters aren’t ready for the cold!
Dashi and Koshi look for baby eels that have lost their way back home.
Paani and the team help a water frog search for more of his species.
Something strange raided Kwazii and Tweak’s campsite and ate all of their food.
A red fox moves into Professor Natquik’s den and causes a mess.
The Vegimals train as pirates to protect mangrove trees from a group of pygmy sloths.
Paani bundles up underground with a new feathered friend after a snowstorm.
The Octonauts rescue a herd of elephants stuck inside a salt cave.
A baby goose won’t sit still and stay in his best to wait for his mama.
Tracker and the team try to find out why all the water in a lake went away.
Ranger Marsh looks to reunite a trio of egg-stealing lizard siblings.
Shellington and pals find mysterious clues of a bison in need of help.
The Octonauts explore the different layers of the rainforest and help its creatures find a new home when their habitat becomes too dried up.
Paani and the team find a new home for alligators after sharks swim into a swamp.
There’s no cocoa in sight, so the Vegimals head to the Amazon for more!
A trio of camels helps a lost Paani find some water in the desert.
A hungry carp endangers a lake after chomping on all of the plants.
Two curious parrots cause problems after sneaking into the Octo-Ray aircraft.
Kwazii and Calico Jack wash ashore on a strange and legendary island.
The agents track down a monarch butterfly that got separated from his swarm.
Calico Jack and Kwazii team up with a sneaky cat to find buried treasure.
While testing out the new Terra-Gup 6, Tweak crash lands in the desert.
A Portuguese man o' war washes ashore; the Octonauts need to reunite him with his legion.
The Octonauts help protect some creatures from rain when the rain shadow effect fails.
When a hoatzin’s eggs go missing in the Amazon, the Octonauts work to get them back.
A search for a gift for Captain Barnacles leads the Vegimals and Shellington to India.
When his little brother Pinto gets trapped on a piece of ice, Peso has to rescue him.
Paani and Min use the new Octoblimp to map a 'river in the sky'.
Harmful algae create a red tide on the Florida coast, causing creatures to get sick.
When the Terra-Gup 1 is damaged, Barnacles and Koshi work together to repair it.
While cleaning up a fire, the Octonauts encounter some fast-learning orangutans.
When a termite colony gets sucked into an aardvark’s nose, the Octos head to the rescue.
A tsunami washes some sea creatures inland; the Octonauts trek into the forest to help.
When a flamingo chick gets left behind, it’s up to the Octonauts to save the young bird.
A lyrebird confounds the Octonauts with its ability to mimic any sound it hears.
When winter comes early in Canada, the Octonauts help some hares with their camouflage.
Kwazii finds that the 'dragon' he’s met is really a Gila monster.
Tweak and Bud find themselves stranded on a floating island made of papyrus reeds.
A Malabar squirrel, stuck aboard the Octoray, starts to build stashes all over the ship.
While cleaning after a storm, the Octonauts find a primate known as a spectral tarsier.
It’s an underwater mystery when a valuable protective shell goes missing.
The Octonauts must track down some Australian possums and help them return home.
When a sea turtle loses a chunk of its shell, Tweak and Bud must engineer a solution.
The Octonauts must chase away some hungry wolves while in the Yellowstone ecosystem.
Tracker spots some northern bald ibises migrating in the wrong direction.
During a mission to replant the area around Mount Kilimanjaro, the Octoray gets stuck.
A solar storm throws off some whales’ senses of direction, as well as the Octonauts.
Tracker and Kwazii help some fish whose food keeps getting stolen by a frigatebird.
When Selva encounters an injured creature, Peso journeys to provide medical aid.
The Octonauts help when they discover melting permafrost endangering an ecosystem.
When a rainstorm surges, the Octonauts contend with an oncoming mudslide.
The Octonauts help a colony of honeybees that are trapped in a sinking tree.
While in search of a boiling river, Kwazii and Paani meet some tamarin monkeys.
When a fire threatens a meerkat burrow, the Octonauts must put it out.
Arctic ringed seals are threatened when warming temperatures diminish their snow caves.
The Octonauts assist an alpine swift to catch up with its flock.
A baby elephant separated from its herd needs the Octonauts' help swimming to safety.
While collecting pictures, Dashi and Shellington get trapped in a flooding cave.
The Octonauts must clear a logjam while protecting a family of birds.
When a blizzard hits, Captain Barnacles will need to use all his Arctic survival tactics.
A replanting mission is interrupted when a gazelle goes missing just as a sandstorm hits.
On a mission to study caddisfly silk, Bud and Paani get washed down a river.
The Octonauts help rebuild some mudflats while reuniting a lost bird with its flock.
Two dolphins get stuck in a coastal saltwater lake during low tide.
Kwazii and Periwinkle try to help a bird found in the Sonoran Desert.
The Octonauts must repair a coral reef protecting a lagoon from surrounding sharks.
The Octonauts and Octo-Agents work together to clean up the Great Pacific Garbage Patch.
When the underwater Kavachi volcano erupts, Ryla calls on the Octonauts to help.
Tracker and Koshi’s bird-studying mission is upended when a mysterious egg appears.
The Octonauts identify a mysterious creature that turns out to be a spider crab in need.
When the Reef Base’s power is knocked out, Octo-Agents lead the charge to restore it.
