Jeffrey is kidnapped, in his 'Jeffrey Knight', by Dark Orca pirates. Can Jeffrey turn the tables and save himself?

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.

The Internet being down is the worst thing imaginable for Ant and Fontaine - until Ant finds the sea monster responsible for this. Can he save both?

The Nektons find an amazing underwater crop circle. It's been built by a giant male puffer fish to attract a mate. Can Ant help the romance along?

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.

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

Trying to rescue Jess Gorman in an underwater cave proves dangerous for Ant and Fontaine until a manatee comes to their aid. But is it too late?

Ant tries to locate a 'diamond-horned sea-unicorn' as a present for Fontaine's birthday. But Dolos and Devil Daniels are also hunting it.

Ant wants to go faster than the fastest fish in the sea - the sailfish. But he hasn't counted on a deadly oil spill that threatens to destroy them.

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.

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?

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

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?

Devil Daniels insists he's relocating a dangerous killer whale. But it's a scam that turns dangerous. Our heroes need to save Ant and the whale.

The Nektons try to save an island from the 'purple tide' that legend says will destroy everything. To save it, they need to locate the Protector.

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

The Aronnax and Alpheus's sub are trapped within a giant jellyfish. They've been eaten and the jellyfish won't let food out.

Smiling Finn comes to the Nektons for help. He wants them to stop his father, Captain Hammerhead, from stealing a treasure.

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