#1 - The Arctic Orcas 8.47
Season 1 - Episode 37
When Captain Barnacles and Peso get lost in the icy Arctic sea, a pod of Orcas help the Octonauts find them.
#2 - The Sea Snakes 8.36
Season 2 - Episode 5
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.
#3 - The Eel Ordeal 8.33
Season 1 - Episode 42
The Octonauts travel up a treacherous river to help a young migrating eel on her difficult journey.
#4 - The Narwhal 8.30
Season 1 - Episode 17
While exploring the Arctic, the Octopod gets trapped in the ice. Only Barnacles's skillful navigation, and the help of a friendly Narwhal, can get them free.
#5 - The Dwarf Lantern Shark 8.25
Season 1 - Episode 44
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!
#6 - The Enemy Anemones 8.14
Season 1 - Episode 16
The Octonauts and some helpless crabs are caught between two territorial groups of aggregating anemones - and their numbers are growing!
#7 - The Lost Lemon Shark 8.01
Season 1 - Episode 48
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.
#8 - The Marine Iguanas 7.94
Season 1 - Episode 43
As the Octonauts prepare for their annual seaweed feast near the Galapagos Islands, a trio of salt sneezing Marine Iguanas steal their seaweed!
#9 - The Kelp Forest Rescue 7.91
Season 1 - Episode 24
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.
#10 - The Giant Spider Crab 7.90
Season 1 - Episode 50
The octonauts help a 100 year old spider crab which has got its leg trapped in a giant clam whilst en route to its own 100th birthday party. It turns out that Kwazii's afraid of spiders, but he still helps, even though he thought it was a real spider at first.
#11 - The Combtooth Blenny 7.89
Season 1 - Episode 33
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.
#12 - The Scary Spookfish 7.89
Season 1 - Episode 36
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.
#13 - The Midnight Zone 7.89
Season 1 - Episode 18
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.
#14 - The Coconut Crabs 7.88
Season 2 - Episode 3
Kwazii finds a mysterious, unbreakable coconut, so the Octonauts seek out the help of some large, island-dwelling coconut crabs to open it.
#15 - The Giant Whirlpool 7.88
Season 1 - Episode 21
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.
#16 - The Crafty Cuttlefish 7.87
Season 1 - Episode 47
Captain Barnacles' compass has been taken by a crafty, shape shifting Cuttlefish
#17 - The Humuhumunukunukuapua'a 7.86
Season 1 - Episode 49
When the Octopod's waterworks are flooded with frightened Humuhumu fish, the Octonauts have to find a way to flush them out.
#18 - The Slime Eels 7.84
Season 1 - Episode 38
Kwazii covets the treasure in a sunken pirate ship, but its protected by slime squirting Slime Eels.
#19 - The Baby Dolphin 7.84
Season 1 - Episode 35
When a young dolphin follows Kwazii home, he has to babysit while the other Octonauts search for its mother.
#20 - The Albino Humpback Whale 7.78
Season 1 - Episode 14
The Octonauts help out an Albino Humpback Whale with a nasty sunburn.
#21 - The Great Algae Escape 7.77
Season 1 - Episode 8
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.
#22 - The Walrus Chief 7.76
Season 1 - Episode 4
When Peso's precious medical kit is taken, Barnacles and Kwazii sneak into a dangerous walrus colony to get it back, disguised as a walrus.
#23 - The Hermit Crabs 7.72
Season 1 - Episode 22
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.
#24 - The Undersea Storm 7.71
Season 1 - Episode 2
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.
#25 - The Pirate Parrotfish 7.71
Season 1 - Episode 45
When the Octonauts go on a pirate treasure hunt, Kwazii meets a Parrotfish.