The WORST Episodes of Octonauts

Every episode ever - ranked by fan votes!

Last Updated: Sep 7, 2021

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.

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Octonauts and the Scaly-Foot Snail

#1 - Octonauts and the Scaly-Foot Snail

Season 5 - Episode 26 - Aired Dec 4, 2018

While out exploring the deep sea hydrothermal vents, Shellington encounters a mysterious creature - a scaly-foot snail.

star 0.00
0 votes
The Swashbuckling Swordfish

#2 - The Swashbuckling Swordfish

Season 2 - Episode 14 - Aired Mar 14, 2013

The octonauts discover a rare showing of a full moon as Kwazii discovers that its known as the Pirate Moon as Kwazii and The Octonauts search for a ship that belonged to the pirate king as Kwazii searches for the sword of the Pirate King until a trio of swordfish prevent Kwazii from getting closer to the wrecked ship. (Episode also known as "The Flying Swords" for USA screenings.)

star 2.87
39 votes
Directors: Nicky Phelan
Writers: Stephanie Simpson
The Loneliest Whale

#3 - The Loneliest Whale

Season 4 - Episode 7 - Aired Oct 1, 2015

The Octonauts follow a strange song to a lonely humpback whale.

star 5.50
4 votes
The Yellow-Bellied Sea Snakes

#4 - The Yellow-Bellied Sea Snakes

Season 4 - Episode 18 - Aired Jun 5, 2016

When a mass of poisonous sea snakes get stranded on a beach, Peso and the Octonauts must somehow get them all back into the ocean.

star 5.50
2 votes
The Mimic Octopus

#5 - The Mimic Octopus

Season 2 - Episode 16 - Aired May 13, 2013

The Octonauts recruit a shape-shifting mimic octopus to help them recover an important vial of medicinal algae from a moray eel's lair.

star 5.68
40 votes
The Bomber Worms

#6 - The Bomber Worms

Season 4 - Episode 12 - Aired Mar 14, 2016

While diving down to the Midnight Zone, the Octonauts are attacked by bomber worms, and are enlisted to rescue an injured member of their troop.

star 5.75
4 votes
Writers: Stephanie Simpson
The Beluga Whales

#7 - The Beluga Whales

Season 1 - Episode 26 - Aired Dec 6, 2010

The Octonauts lead a pod of Beluga Whales stuck under the pack ice to safety by getting them to follow Peso while he's playing the same tune as the Beluga's song on his xylophone.

star 5.90
165 votes
Writers: Stephanie Simpson
The Electric Torpedo Rays

#8 - The Electric Torpedo Rays

Season 1 - Episode 46 - Aired Feb 7, 2011

When the Octopod loses all power, the Octonauts give it a jumpstart with the aid of some Electric Torpedo Rays!

star 6.02
106 votes
Writers: Stephanie Simpson
The Sardine School

#9 - The Sardine School

Season 1 - Episode 40 - Aired Jan 28, 2011

The Octonauts must work together as a team to help a lost sardine find her school.

star 6.05
131 votes
Writers: Stephanie Simpson
The Enormous Elephant Seal

#10 - The Enormous Elephant Seal

Season 1 - Episode 39 - Aired Jan 27, 2011

When Peso and the Octonauts aid an enormous Elephant Seal, he overstays his welcome in the Octopod.

star 6.25
134 votes
Writers: Stephanie Simpson
The Humuhumunukunukuapua'a

#11 - The Humuhumunukunukuapua'a

Season 1 - Episode 49 - Aired Feb 10, 2011

When the Octopod's waterworks are flooded with frightened Humuhumu fish, the Octonauts have to find a way to flush them out.

star 6.25
130 votes
Writers: Stephanie Simpson
The Flying Fish

#12 - The Flying Fish

Season 1 - Episode 5 - Aired Oct 8, 2010

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.

star 6.41
326 votes
Writers: Stephanie Simpson
The Coconut Crisis

#13 - The Coconut Crisis

Season 4 - Episode 19 - Aired Jun 6, 2016

Kwazii and the Octonauts help their friends the coconut crabs discover who is stealing their coconuts.

star 6.50
2 votes
The Scary Spookfish

#14 - The Scary Spookfish

Season 1 - Episode 36 - Aired Jan 24, 2011

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.

star 6.51
113 votes
Writers: Stephanie Simpson
The Crafty Cuttlefish

#15 - The Crafty Cuttlefish

Season 1 - Episode 47 - Aired Feb 8, 2011

Captain Barnacles' compass has been taken by a crafty, shape shifting Cuttlefish

star 6.53
106 votes
Writers: Stephanie Simpson
The Great White Shark

#16 - The Great White Shark

Season 2 - Episode 4 - Aired Nov 22, 2012

Peso must perform an emergency fin bandage on a hungry great white shark, but first they need to subdue the giant predator using a trick called 'tonic immobility'.

star 6.56
45 votes
The Mantis Shrimp

#17 - The Mantis Shrimp

Season 4 - Episode 6 - Aired Sep 30, 2015

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

star 6.57
7 votes
The Decorator Crab

#18 - The Decorator Crab

Season 1 - Episode 25 - Aired Nov 5, 2010

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.

star 6.60
194 votes
Writers: Stephanie Simpson
The Midnight Zone

#19 - The Midnight Zone

Season 1 - Episode 18 - Aired Oct 27, 2010

While exploring the deepest part of the ocean, the Midnight Zone, the Octonauts discover a strange rock that happens to be home to a new species of worm.

star 6.64
149 votes
Writers: Stephanie Simpson
The Barracudas

#20 - The Barracudas

Season 3 - Episode 9 - Aired Mar 10, 2014

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

star 6.64
14 votes
The Sea Sponge

#21 - The Sea Sponge

Season 3 - Episode 16 - Aired Mar 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.

star 6.69
13 votes
The Adelie Penguins

#22 - The Adelie Penguins

Season 2 - Episode 2 - Aired Nov 20, 2012

While Kwazii and Peso have their hands full babysitting a bunch of Adelie penguin chicks, Captain Barnacles must rescue the chicks' parents from a perilous sea storm!

star 6.76
82 votes
The Great Algae Escape

#23 - The Great Algae Escape

Season 1 - Episode 8 - Aired Oct 13, 2010

Captain Barnacles and his crew must catch a runaway Octopod, when it is hijacked by a group of crustaceans trying to escape their algae-infested waters.

star 6.81
215 votes
Writers: Stephanie Simpson
The Hermit Crabs

#24 - The Hermit Crabs

Season 1 - Episode 22 - Aired Nov 2, 2010

When Captain Barnacles Bear and most of the crew are unable to return to base, it's up to Peso and Tweak to remove a stuck hermit crab from its shell.

star 6.85
136 votes
Writers: Stephanie Simpson
The Seahorse Tale

#25 - The Seahorse Tale

Season 1 - Episode 29 - Aired Dec 9, 2010

After a storm, the Octonauts have to reunite a seahorse with its missing mate - who is about to give birth to baby seahorses!

star 6.86
166 votes
Writers: Stephanie Simpson