S1 • E1
When Dashi is accidentally swallowed by a whale shark, the Octonauts venture inside the huge fish to rescue her.
S1 • E2
When Kwazii's Gup-B breaks down in a storm, not even brave Captain Barnacles can save him alone. Fortunately, a chain of reef lobsters lends a hand - and some claws.
S1 • E3
Barnacles and Kwazii investigate a disruption on a nearby reef - a Carrier Crab and the Urchin who lives on its shell just can't seem to get along.
S1 • E4
When a walrus runs off with Peso's medical bag, the Octonauts venture into the walrus colony to get it back.
S1 • E5
When a school of flying fish accidentally make off with a rare book belonging to Professor Inkling, the Octonauts rig up the Gup-B to fly after them and get it back.
S1 • E6
The Octonauts set out to find and photograph Inkling's long lost cousin, the elusive Giant Squid.
S1 • E7
When a huge Orca whale becomes stranded on a beach, Captain Barnacles and the Octonauts devise a plan to pull him back into to the water, with some help from a group of tunneling Fiddler Crabs.
S1 • E8
Captain Barnacles and crew must catch a runaway Octopod, when its hijacked by a group of crustaceans trying to escape their algae-infested waters.
S1 • E9
When Shellington gets lost in a dark sea cave, he gets unexpected assistance from some blind Remipedes.
S1 • E10
When all the Gups go out of control, Barnacles and Kwazii leap onto the backs of speedy Sailfish to round them up.
S1 • E11
The Octonauts must evacuate sea creatures before an underwater volcano erupts, but there's one creature that won't budge: a slow-moving, gelatinous Blobfish.
S1 • E12
The Octonauts follow an old map to what Kwazii believes is treasure guarded by a sea monster, but instead they meet a playful Octopus with all kinds of surprising abilities.
S1 • E13
The Octonauts find an unusual sea star on the beach.
S1 • E14
The Octonauts help out an Albino Humpback Whale with a nasty sunburn.
S1 • E15
When Kwazii's favorite sub, the Gup-B goes missing, the Octonauts journey into a mysterious kelp forest to find it, meeting strange and interesting creatures along the way.
S1 • E16
The Octonauts and some helpless crabs are caught between two groups of anemones.
S1 • E17
While exploring the Arctic, the Octonauts ship, the Octopod, gets trapped in the ice. Only Barnacles skillful navigation - and the help of a friendly Narwhal - can get them free.
S1 • E18
While exploring the deepest part of the ocean, the Midnight Zone, the Octonauts discover a strange rock that happens to be home to new species of worm.
S1 • E19
The Octonauts encounter a snapping shrimp.
S1 • E20
The Octonauts share a few fun facts about the snot sea cucumber.
S1 • E21
The Octonauts race against time to rescue Tweak's pal, a Leatherback Sea Turtle who's caught in a fast-moving ocean current that's sucking it into a whirlpool.
S1 • E22
When Captain Barnacles and most of the crew are unable to return to base, its up to Peso and Tweak to remove a stuck Hermit Crab from its shell.
S1 • E23
When the Octonauts clean & repair their ship, the Octopod - the resulting noise causes a nearby Blue Whale to act in strange & dangerous ways.
S1 • E24
When Peso's little brother Pinto comes to visit, he's more interested in being a pirate than a medic - at least until he accompanies Peso on a mission to rescue Dashi and Shellington in a kelp forest.
S1 • E25
When important objects go missing from their ship, the Octonauts stake out the thief - who turns out to be a decorator crab, stealing their things to decorate his shell.
S1 • E26
When the Octonauts discover a pod of Beluga Whales stranded at a breathing hole, they use music to lead them to safety.
S1 • E27
The Hungry Pilot Fish: A lost Pilot Fish who eats ocean gunk cleans up the Octonauts' dirty Gups - but he's still hungry! Meanwhile, Captain Barnacles must figure out why a Whitetip Shark is chasing the Gup-A! The Beluga Whales: When the Octonauts discover a pod of Beluga Whales stranded at a breathing hole, they use music to lead them to safety.
S1 • E28
On a solo training dive to the Midnight Zone, Peso encounters a hurt vampire squid. Scared by the sudden arrival of Kwazii and Captain Barnacles it sprays them with sticky bioluminescent mucus and flees, but in the end Peso is able to help it.
S1 • E29
After a storm, the Octonauts help a female seahorse search for her missing mate. She tells them to Kwazii's surprise that the missing male seahorse is about to give birth to baby seahorses.
S1 • E30
The Octonauts must rescue Peso when he gets trapped inside a giant comb jelly.
S1 • E31
Some mysterious holes that keep appearing in the Octonauts' equipment turn out to be the work of cookiecutter sharks whose bioluminescence initially made them invisible against the light coming down from the sea surface.
S1 • E32
Dashi catches a glimpse of an elusive creature that appears to be a giant sea serpent and manages to photograph its tail. The truth is stranger than fiction when it appears to be an awesomely, long oarfish.
S1 • E33
When Kwazii and Peso are shipwrecked on a desert island, they encounter a Combtooth Blenny - a fish who walks on land! They enlist him to send an SOS message to the other Octonauts.
S1 • E34
Shellington gets trapped by sea nettle jellyfish whilst watching garden eels. Barnacles, Kwazii and Peso try to save him but Barnacles gets stung by a jellyfish. Luckily, Peso heals it with vinegar and then goes to the rescue with Kwazii.
S1 • E35
A young dolphin follows Kwazii home while he's babysitting it and the Octonauts must search for its mother.
S1 • E36
The Octonauts try to pull Peso out of an oceanic trench and get some help from a strange-looking creature with a see-through head: a Spookfish.
S1 • E37
When Captain Barnacles and Peso get lost in the icy Arctic sea, a pod of Orcas help the Octonauts find them.
S1 • E38
Kwazii searches the shipwreck of his pirate grandfather for his gold spyglass. It's guarded by blind hagfish, but their slime unexpectedly helps him when he gets stuck. Kwazii leaves the spyglass because it's now the home of sea creatures.
S1 • E39
When Peso and the Octonauts aid an enormous Elephant Seal, he overstays his welcome in the Octopod.
S1 • E40
The Octonauts must work together as a team to help a lost sardine find her school.
S1 • E41
When the Octonauts all pitch in to help save a sick coral reef, they get some unexpected help from a pod of playful dolphins.
S1 • E42
The Octonauts travel up a treacherous river to help a young migrating eel on her difficult journey.
S1 • E43
The team are preparing for a feast of red seaweed on the Galapagos Islands but a trio of salt-sneezing Marine Iguanas raid the Octopod and eat it all.
S1 • E44
Down in the darkness of the ocean deep, Peso and the Octonauts must help a tiny, injured dwarf lanternshark. But they have to find him first.
S1 • E45
Kwazii discovers Calico Jack's Parrot Island treasure map behind an old photo. Whilst looking for the island they meet a parrotfish, who helps them clear away dense algae and hide from vicious moray eels.
S1 • E46
Some electric torpedo rays give the Octopod a jump-start when its batteries go flat during a trip to see Tweak's pal, Sandy the leatherback sea turtle.
S1 • E47
Captain Barnacles allows Tunip to use his Octo-compass. But when Tunip loses it, a Cuttlefish takes it.
S1 • E48
The Octonauts have their hands full as they look after a headstrong young Lemon Shark who's hurt his nose and can't find his way home.
S1 • E49
The Octopod's waterworks become flooded with frightened Humuhumu fish. The Octonauts must find a way to flush them out.
S1 • E50
Humuhumus: When the Octopod's waterworks are flooded with frightened Humuhumu fish, the Octonauts have to find a way to flush them out! Giant Spider Crab: Kwazii is spooked when he spots what looks like a giant underwater spider! But it turns out to be a very old Spider Crab who needs the Octonauts' help!
S1 • E51
The Octonauts cheer Peso on as he goes home to compete against an awesomely athletic penguin in an annual tournament: the Iron Clam Competition.
S1 • E52
The Octonauts travel to Professor Inkling's childhood home for Christmas, an undersea mountain. But they discover that a rock slide has endangered the local creatures - including a rare species of golden coral, and Inkling's little octopus nephew, Squirt! With the help of Tweak's latest invention, the Gup X, the Octonauts must rescue the creatures and save Christmas.
Captain Barnacles
Shellington
Captain Barnacles
Tweak
Kwazii
Dashi
Peso
Vegimals
Dashi
Additional Voices