The Nektons attempt to stop toxic fuel from a fallen satellite from polluting a marine sanctuary. But they encounter a mysterious new adversary, Alpheus Benthos, who has not only brought down the satellite himself, but wants to use the mapping data it contains to find Lemuria before them. When Ant and Fontaine track him down, it seems Alpheus believes Ant and he have a "shared destiny". He won't reveal what that is however. Will and Kaiko locate the satellite, but the casing around the power core cracks and leaks. It's going to explode, creating even more havoc, ...

Is the Baltic Sea Anomaly really a UFO that crashed into the ocean 6000 years ago? Ant believes what he reads about it on the Net and thinks it is. The mysterious Ephemychron is telling them that it's somehow connected to Lemuria and the Nektons need to determine exactly how. But what they find inside the Anomaly is even more strange and frightening. At first it seems like tiny aliens are attacking them. Then Kaiko realizes they're very large mantis shrimp. But their supersonic pincers are capable of punching through anything and now the Aronnax itself is in danger ...

Mermaids don't exist - right? Well, if that's true, then what's that mermaid-shaped thing swimming outside the Aronnax? Ant sees a mermaid and is determined to catch it. He doesn't realise he's chasing Fontaine, wearing a new "Mimic-Knight" that she's built with Professor Fiction. But Fontaine and Fiction are captured by the Dark Orca Pirates and Captain Hammerhead wants Fiction to build him a Knight too. A Super-Knight. One big enough to tear its way into a sunken submarine to retrieve a mysterious treasure - and one that's strong enough to beat the Nektons. When Ant...

Tardigrades are the strongest creatures on Earth - able to survive in almost any environment. But they're also microscopic. So why are there giant ones in the middle of the Bermuda Triangle? When the Nektons follow one through a strange "portal" in the water, they find themselves in a zone where the laws of physics don't seem to apply. What's more, they can't seem to escape now. The Ephemychron has lead them to this place and when Ant finds an ancient Lemurian ship that's been expanded and pulled to pieces by the forces in this zone, the Nektons fear that they could

A giant, upright standing monster, straight out of a monster movie, is walking across the ocean floor, causing havoc. Kaiko knows this isn't a normal sea-creature. How can something like this exist? And why is it heading towards the island of the Nekton's old friend Kenji Nakimura? It transpires that Kenji built this robotic monster when he worked in the movie business, years ago. But somehow it's been activated again and is on a collision course with the Giant Hermit Crabs that inhabit the waters off Kenji's island. As much as Ant loves a good "battle of the monsters...

Pirate boy Smiling Finn comes to the Nektons pleading for help. He wants them to stop his father, Captain Hammerhead, from stealing a treasure. Ant finds this very puzzling - why would a pirate not want to steal a treasure? Despite their reservations, the Nektons save the treasure from the Pirates. But in the process, Will gets very sick and collapses. It seems Finn hasn't told the Nektons the entire truth. The treasure is cursed. He was trying to protect his father from this and now it seems Will has succumbed to it. But is it really a curse? Fontaine doesn't think ..

A mysterious, ancient temple beneath the sea has been hidden for centuries. The Nektons discover it and find two large statues guarding its entrance. An ancient inscription warns them to "beware the sentinels". But Ant is skeptical. After all, they're made of stone; they can't move. What can they do? As the light gets gloomier however, the skin on the statues seems to ripple and come alive. It seems the statues are covered with deadly, poisonous stone-fish - and they're determined to protect their environment. The Nektons are trapped inside the temple by the ...

The Nektons' nemesis Alpheus Benthos breaks into the Aronnax to steal the Ephemychron and stop the Nektons from finding Lemuria forever! Ant is determined to get it back at all costs.

The Nektons find a mysterious underwater maze. When they enter it, walls shift and they become disoriented. They're soon trapped inside and, what's worsethey're not alone!

The Nektons encounter a huge, white whale, but Devil Daniels: Monster Hunter is trying to capture it. When they discover who the whale really is, the Nektons go head-to-head with Daniels to save it!

The Nektons find the Dark Orca pirate submarine completely deserted! It's as if the pirate crew have abandoned it. But why? And what are those mysterious, ghostly sounds?

At Catatumbo Bay, a lightning storm has been raging for hundreds of yearsand for the first time, it's intensifying. The Nektons' investigations reveal that a gigantic creature is responsible!

A dragon hunting expedition leads Ant to an ancient scroll that holds clues to an amazing mystery. But his family are trapped by the dragon and only Ant and Jeffrey can save them! And Jeffrey's a fish!

The Dark Orca pirates attack! They believe the Nektons have a rare treasure aboard their sub. With pirates on one side and an erupting undersea volcano on the other, the Nektons will have to get creative to escape!

An artificial intelligence programmed to run the sub and protect the Nektons tries to stop their rescue mission because it's too risky. When they try to shut her down, she takes over completely to save them from themselves!

Will and Ant are retrieving an item from the deepest part of the ocean, but it is not what they were told. They've been duped! And now there's a stowaway on the Aronnax, trying to take control of it.

Are aliens stealing things from a Japanese island and dragging them underwater? Ant believes that's perfectly reasonable. The Nektons investigate and find something even more dangerous! But can they escape?

Someone just stole the rarest tortoise in the world and the Nektons are searching for it. But the man who stole it secretly wants to capture them too! They're walking into a trap, but really, there's no other way.

Captain Hammerhead has captured the Nektons aboard his sub! But his rusty vessel is about to sink. The Arronax could save them all, but first, Hammerhead would have to free the Nektons-and that's not exactly in his character.

To find a piece of the mysterious Ephemychron, the Nektons have to fight off whirlpools, zero visibility and giant robotic jellyfish! Is Nereus doing this to them? If not, who is really behind all these obstacles?

Huge prehistoric crocodiles still inhabit an underwater cave system the Nektons are exploring. Ant shouldn't have bonded with that baby croc-its enormous mother doesn't take kindly to kidnappers, and now she's after him!

Ant and Fontaine hunt for one of the rarest ocean creatures: the colossal squid. But it turns out to be smarter than anyone thought and thinks the Nektons look tasty! Can the Aronnax survive being pulled down very, very deep?

Media superstar Devil Daniels - Monster Hunter is hunting a sea creature that he believes is a menace, but the Nektons want to protect it. To make matters worse, the public are on Daniels's side!

Does a ghost sub haunt the ocean depths? Ant believes it does, but when he actually finds this "ghost sub", the truth is even stranger- and much more dangerous. Ant and Fontaine find themselves trapped- by a ghost?

While diving in a rare blue hole, a sinkhole in the middle of the sea, strange things begin to happen to the Nektons. They're seeing things that can't exist. And where did the exit go? Why is there no way out?

Ant and Fontaine are sure they can control some young fans visiting the Aronnax. But when they have to rescue a whale calf, success depends on them and all the hyperactive kids working well together. What could go wrong?

Dolos has sold two maps leading to the same treasure: one to the Nektons, the other to the pirates! Now it's a race to get there first, and the winner will need to use every sneaky trick in the book to win.

As the Nektons explore a mysterious tunnel behind a huge undersea waterfall, strange creatures and strong currents surprise them at every turn. Everything is not as it seems. The true nature of the tunnel will astonish them.

The Nektons are arrested for stealing. Ant and Fontaine escape to prove their innocence, but whoever set them up is already two steps ahead.

Fontaine and Smiling Finn get stuck inside a giant clam as the dark orca pirates battle the Nektons for the giant pearl within.

Proteus, leader of the mysterious Guardians, traps the Aronnax in a magnetic field and kidnaps Ant, believing he is the key to finding Lemuria.

Devil Daniels, Monster Hunter, attempts to hunt a sire - a mythical creature whose song lures sailors to their doom.

A fish invades Jeffrey's home on the Aronnax. How can she get rid of it and its bad luck?

The Rover is swallowed by a huge prehistoric shark. Will and Fontaine manage to cling to its gills just inside its mouth.

The Nektons are trying to identify a unique life form. They've never seen it, they've only heard its sound: 'Bloop'.

A weird glowing fish has lured every fish in the area to its bioluminescence, and Kaiko and Will also fall under its spell.

While fighting over Viking treasure, the Nektons take over the Dark Orca. But the pirates in turn take over the Aronnax.

The Nektons explore a floating island and find the final piece of the Ephemychron in a cave. But the island has a terrible secret.