When an underwater hurricane destroys a small reef, which a frogfish and other creatures depend on, Tweak and her crew must convert the recently destroyed Gup-F into an artificial reef before the hurricane strikes again.
Only Peso can save the day when a cone snail invades the Octopod and tranquilises the crew one by one with its dangerous venom-filled harpoons.
Some leafy sea dragons accidentally get into the Octopod.
The Octonauts get more than they bargained for when they use the Octopod to transport a pair of invasive lionfish back to their native habitat.
Tizzy is very excited to have her friends act out her favourite story, Tizzylocks and the Three Teddies. However, things don't quite go as planned.
The Octonauts recruit a shape-shifting mimic octopus to help them recover an important vial of medicinal algae from a moray eel's lair.
Dom is out exploring the great outdoors - on a search for something amazing. Through encounters with each of his friends, he eventually discovers that he didn't have to go very far to find what he was looking for.
When Meeks and Tizzy notice that lots of leaves are falling off the Telling Tree, they think she might be sick. They find ways to help her, only to eventually discover that she loses her leaves once a year.
When he's carried away by a cyclonic waterspout, Kwazii finds himself stranded in the open ocean with a triggerfish who's made her home underneath the damaged Gup-B.
After an undersea tremor separates the Gup-X and its crew, Barnacles seeks guidance from a mysterious sea turtle.
It's Pizza for Dinner Day and the teddies are excited to make pizza, but nothing seems to go their way. Luckily, Dom saves the day with another one of his amazing inventions.
The Octonauts journey to the Everglades to help Tweak's dad, Ranger Marsh, track down several invasive species, including a Burmese python and her babies.
When Kwazii gets lost at sea aboard the tiny octo-ski, he meets a flotilla of sea skaters.
As Tweak tests the Gup-X deep down in the Midnight Zone, a yeti crab cuts a vital electrical wire in the ship and cuts off all power, endangering itself and the Octonauts.
The Octonauts must stop a huge herd of sea pigs before they march blindly into the Mariana Trench - the deepest point on earth!
While out hiking with Meeks, Sparky realises that she might have left her new toy hippo behind along the way, so they go about retracing their steps to try to find it.
When hungry gulper eels as well as undersea tremors threaten Inkling and Kwazii, Dashi uses the new, multi-purpose Octo Max Suit to rescue them.
The Octonauts use magnets to try to stop a meteor that's heading toward the Octopod and get assistance from a rock-chomping humphead parrotfish and her friends.
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