The Nektons explore a floating island and find the last piece of the Ephemychron. Ant assembles it, and it works! Perhaps now they can find Lemuria! But why is this island moving?

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.

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?

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?

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?

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!

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?

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!

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?

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.

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.

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?

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.

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!

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!

On the hunt for dragons, an ancient scroll is uncovered by Ant, only for his family to become trapped by a dragon.

While fighting over Viking treasure, the Nektons take over the Dark Orca. But the pirates in turn take over the Aronnax. Neither side is happy about strangers in their homes! But neither side is willing to back down.

A weird glowing fish has lured every fish in the area to its bio-luminescence. When Kaiko and Will also fall under its spell, Ant and Fontaine must rescue their parents-while wearing blindfolds against the hypnotic glow.

The Nektons are trying to identify a unique life form. They've never seen it- they've only heard its sound: "Bloop". Just as Ant discovers its true nature, a huge underwater mining machine threatens to destroy it!

The Rover is swallowed by a huge, supposedly extinct prehistoric shark-a megalodon! Will and Fontaine manage to cling to its gills just inside its mouth. Kaiko and Ant frantically try to free them - they can't hold on forever!

Can a fish really be responsible for wrecking Dolos's boat, sinking the Aronnax, and almost destroying the Rover? Fontaine believes so-and it's invaded Jeffrey's home on the Aronnax. How can she get rid of it and its bad luck?

Devil Daniels- Monster Hunter thinks he's hunting a siren- a mythical creature whose song lures sailors to their doom. The Nektons discover it's actually a rare whale with a unique voice, and race to save it from destruction.

Proteus, leader of the mysterious Guardians, traps the Aronnax in a magnetic field and kidnaps Ant, believing he is the key to finding Lemuria. Ant thinks Proteus is crazy. He tries to escape to save his family.

Fontaine and Smiling Finn get stuck inside a giant clam as the dark orca pirates battle the Nektons for the giant pearl within! Air is scarce and time is running out. Can the pirates and Nektons work together to save 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. Clearing the Nekton name won't be easy-especially with a spy aboard the Aronnax!

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.