The WORST episodes of Octonauts

Every episode of Octonauts ever, ranked from worst to best by thousands of votes from fans of the show. The worst episodes of Octonauts!

Captain Barnacles and his intrepid band of explorers roam the oceans in search of adventure and fun. Whether it's a perilous voyage to the bottom of the sea or the piratey pursuit of a giant squid, the Octonauts leap into action and always prove that eight heads are better than one.

Last Updated: 4/25/2025Network: CBeebiesStatus: Continuing

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#1 - The Mudskippers

Season 3 - Episode 12 - Aired 3/13/2014

The Octonauts attempt to keep the peace amongst a trio of mudskippers whose home has been flooded.

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#2 - The Mantis Shrimp

Season 4 - Episode 2 - Aired 9/30/2015

The Octonauts must get 2 mantis shrimp to stop fighting before their powerful claw strikes destroy the Octopod.

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#3 - The Walrus Pups

Season 4 - Episode 1 - Aired 9/29/2015

Captain Barnacles and his niece and nephew, Ursa and Orson, must rescue walrus pups who are stranded on a runaway ice floe, before it collides with a huge iceberg!

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#4 - The Baby Sea Turtles

Season 4 - Episode 5 - Aired 9/28/2015

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

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#5 - The Octopod Mystery

Season 4 - Episode 6 - Aired 9/25/2015

When the Octopod breaks down, Tweak and the crew search for a missing part aboard an abandoned prototype of the ship, not realising something lives there.

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#6 - The Hidden Lake

Season 4 - Episode 4 - Aired 9/24/2015

The Octonauts are exploring Antarctica, when Shellington discovers strange microscopic creatures living under the ice.

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#7 - The Poison Dart Frogs

Season 4 - Episode 3 - Aired 9/23/2015

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.

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#8 - The Urchin Invasion

Season 3 - Episode 18 - Aired 3/21/2014

The Octonauts head to the kelp forest to visit Shellington's sister, Pearl, and her newborn son Periwinkle - only to find the forest endangered by an infestation of kelp-eating urchins!

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#9 - The Immortal Jellyfish

Season 3 - Episode 17 - Aired 3/20/2014

Shellington and the Octonauts try to track an unusual creature: a jellyfish that can transform from old to young repeatedly - and live forever!

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#10 - The Sea Sponge

Season 3 - Episode 16 - Aired 3/19/2014

A sea sponge that houses other sea creatures in its pores suffers from a mysterious illness and Peso must figure out the cause.

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#11 - The Red Rock Crabs

Season 3 - Episode 15 - Aired 3/18/2014

When Shellington and the crew try to gather some skittish crabs who have drifted away from home, they get help from some old friends.

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#12 - The Lion's Mane Jellyfish

Season 3 - Episode 14 - Aired 3/17/2014

A lion's mane jellyfish gets its long and stingy tentacles tangled in the bubble engine, unintentionally flooding the Octopod and causing havoc.

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#13 - The Harbor Seal

Season 3 - Episode 13 - Aired 3/14/2014

When Peso's patient, a remora fish, mysteriously disappears, the Octonauts enlist a unique undersea detective - a harbour seal.

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#14 - The Duck-Billed Platypus

Season 3 - Episode 10 - Aired 3/11/2014

While rescuing river creatures after a storm, the Octonauts find a strange egg and come under attack by stinging platypuses.

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#15 - The Barracudas

Season 3 - Episode 9 - Aired 3/10/2014

Shellington and the Vegimals' mission to replant a mangrove forest is put in peril by a school of toothy barracudas.

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#16 - The Great Christmas Rescue

Season 1 - Episode 52 - Aired 12/24/2011

The Octonauts travel to Professor Inkling's childhood home for Christmas, an undersea mountain. But they discover that a rockslide 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.

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#17 - The Sea Skaters

Season 3 - Episode 11 - Aired 3/12/2014

When Kwazii gets lost at sea aboard the tiny octo-ski, he meets a flotilla of even tinier sea skaters - the only insects who live on the ocean.

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#18 - The Yeti Crab

Season 3 - Episode 8 - Aired 9/13/2013

As Tweak tests the Gup-X deep down in the Midnight Zone, a yeti crab damages the ship, endangering itself and the Octonauts.

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#19 - The Sea Pigs

Season 3 - Episode 7 - Aired 9/12/2013

The Octonauts must stop a huge herd of sea pigs before they march blindly into the Mariana Trench - the deepest point on earth!

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#20 - The Pelicans

Season 3 - Episode 6 - Aired 9/11/2013

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.

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#21 - The Artificial Reef

Season 3 - Episode 4 - Aired 9/9/2013

When an underwater storm destroys a small reef, Tweak and her crew try to convert the Gup-F into an artificial equivalent.

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#22 - The Cone Snail

Season 3 - Episode 3 - Aired 9/6/2013

Peso sets out to save the day when a cone snail invades the octopod and picks off the crew one by one with its dangerous harpoons.

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#23 - The Waterbears

Season 3 - Episode 2 - Aired 9/5/2013

The gang ventures into a red-hot lava tube to rescue a tiny water bear that does not seem to mind the heat at all.

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#24 - The Siphonophore

Season 3 - Episode 1 - Aired 9/4/2013

Kwazii and Dashi become entangled in a strange deep-sea creature - a siphonophore.

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#25 - The Humphead Parrotfish

Season 2 - Episode 21 - Aired 9/2/2013

The Octonauts use magnets to try to stop a meteor that's heading toward the Octopod and get an assist from a rock-chomping humphead parrotfish and her friends.

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