The BEST Episodes of Octonauts
Every episode ever - ranked by fan votes!
Last Updated: Jul 1, 2020
Network: CBeebies
Animated deep sea adventure series. 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.
#1 - The Coelacanth
Season 4 - Episode 20 - Aired Jun 7, 2016
While exploring a dark and spooky cave, the Octonauts discover the fossil of a powerful, prehistoric fish... but it may be more than just a fossil.
10.00 
#2 - The Octonauts and the Chinese Giant Salamander
Season 5 - Episode 1 - Aired Dec 3, 2018
The Octonauts head to the Yangtze River to help Min the Mapmaker, an old friend of Inkling's, who's been trapped by a mysterious creature. Turns out, It was just a Chinese giant salamander protecting it's precious eggs, which have fallen ill due to rising water temperatures.
10.00 #3 - Octonauts and the Scaly-Foot Snail
Season 5 - Episode 2 - Aired Dec 4, 2018
While out exploring the deep sea hydrothermal vents, Shellington encounters a mysterious creature - a scaly-foot snail.
10.00 
#4 - The Dwarf Lantern Shark
Season 1 - Episode 44 - Aired Feb 3, 2011
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!
8.87 
#5 - The Kelp Monster Mystery
Season 4 - Episode 17 - Aired Jun 4, 2016
Dashi teams up with her little sister, Koshi, to solve a mysterious disappearance in a kelp forest.
8.67 
#6 - The Surfing Snails
Season 4 - Episode 14 - Aired Mar 22, 2016
When surfing snails are swept out to sea by a huge wave, it's up to Dashi and the Octonauts to save them before their bubble rafts pop!
8.50 
#7 - Operation Cooperation
Season 4 - Episode 16 - Aired Apr 4, 2016
After Shellington crashes the Gup-D, he and Kwazii team up with a moray eel and grouper fish to pick up the pieces.
8.50 
#8 - The Eel Ordeal
Season 1 - Episode 42 - Aired Feb 1, 2011
The Octonauts travel up a treacherous river to help a young migrating eel on her difficult journey.
8.40 
#9 - The Loggerhead Sea Turtle
Season 3 - Episode 20 - Aired Oct 8, 2013
When an underwater tremor separates the Gup-X and its crew, Barnacles seeks guidance from a mysterious sea turtle.
8.38 
#10 - The Cone Snail
Season 3 - Episode 3 - Aired Sep 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.
8.29 
#11 - The Coconut Crabs
Season 2 - Episode 3 - Aired Nov 21, 2012
Kwazii finds a mysterious, unbreakable coconut, so the Octonauts seek out the help of some large, island-dwelling coconut crabs to open it.
8.27 
#12 - The Sea Pigs
Season 3 - Episode 7 - Aired Sep 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!
8.27 
#13 - The Sea Snakes
Season 2 - Episode 5 - Aired Nov 23, 2012
It's Sea Snakes on an Octopod when a poisonous sea krait lays her eggs in the garden pod, just as Captain Barnacles has to navigate the ship past a treacherous whirlpool.
8.26 
#14 - The Dolphin Reef Rescue
Season 1 - Episode 41 - Aired Jan 31, 2011
When the Octonauts all pitch in to help save a sick coral reef, they get some unexpected help from a pod of playful dolphins.
8.19 
#15 - The Great Penguin Race
Season 1 - Episode 51 - Aired Dec 13, 2010
Animated deep sea adventure series. Captain Barnacles and his intrepid band of explorers roam the oceans in search of adventure and fun. The Octonauts cheer Peso on as he goes home to compete against an awesomely athletic penguin in an annual tournament - the Iron Clam Competition.
8.17 
#16 - The Arctic Orcas
Season 1 - Episode 37 - Aired Jan 25, 2011
When Captain Barnacles and Peso get lost in the icy Arctic sea, a pod of Orcas help the Octonauts find them.
8.00 
#17 - The Baby Gator
Season 4 - Episode 11 - Aired Mar 14, 2016
Kwazii adopts a baby alligator, but when it escapes the Octopod, he must rescue the tiny creature from ocean currents and hungry predators.
8.00 
#18 - The Hippos
Season 4 - Episode 22 - Aired Jun 9, 2016
Returning home from Africa, the Octonauts encounter a gang of large, territorial hippos.
8.00 
#20 - The Sunfish
Season 4 - Episode 24 - Aired Jun 14, 2016
Join Captain Barnacles and his intrepid band of explorers, The Octonauts, for more deep sea adventures. The Octonauts 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. The Octonauts must help a giant sunfish who can't swim straight, before it hurts other sea creatures and itself.
8.00 
#21 - The Tiger Shark
Season 4 - Episode 21 - Aired Jun 8, 2016
The young Tiger Star is hungry and willing to eat anything or anyone.
8.00 
#22 - The Hidden Lake
Season 4 - Episode 2 - Aired Sep 24, 2015
The Octonauts are exploring Antarctica, when Shellington discovers strange microscopic creatures living under the ice.
7.95 
#23 - The Yeti Crab
Season 3 - Episode 8 - Aired Sep 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.
7.92 
#24 - The Urchin Invasion
Season 3 - Episode 18 - Aired Mar 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!
7.92 
#25 - The Jellyfish Bloom
Season 1 - Episode 34 - Aired Dec 16, 2010
When Shellington gets trapped in the middle of a massive Jellyfish bloom, it's up to the Octonauts to rescue him.
7.88