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 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 worse they're not alone.

The Nektons enter an area of the Bermuda Triangle where the laws of physics don't seem to apply. What's more, they can't escape.

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

When Alpheus Benthos announces he has found the gates to Lemuria, the Nektons fear he's beaten them to their greatest prize.

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

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.

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

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

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.

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.

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.

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.

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?

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?

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.

Is the Baltic Sea anomaly really a UFO that crashed into the ocean? Ant thinks it is. But what the Nektons find inside is even more strange.

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?

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

A giant, upright creature, straight out of a monster movie, walks across the ocean floor, causing havoc.

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

The Dark Orca pirates unwittingly steal a treasure that could awaken a Monumential.

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.

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 searches a deep chasm for clues to his grandparents' fate but is stunned to find Mad Madeline there. She has been looking for the biggest sunken treasure ever, but all she has managed to find is the biggest monster.

Does Dolos really have a lead on finding Ant’s grandparents? Or is he leading the Nektons into a dangerous chasm between moving tectonic plates for nefarious purposes?

Mad Madeline steals the dangerous Sceptre of Queen Dorius.

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?

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?

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?

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

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

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

Ant and Fontaine realise that their grandparents found Lemuria before them - but where are they now? The Nektons follow the trail they left but run into giant, predatory Sand Strikers. Was this the fate of their grandparents?

Three baby Monumential turtles hatch, and they are the size of city blocks. The playful babies accidentally sink a fishing trawler. Can the Nektons wrangle these creatures before they sink even more ships?

A mysterious dolphin in a sophisticated electronic harness zaps all the Rover's power. Ant and Fontaine manage to remove the harness, but can they rehabilitate this cybernetic dolphin to survive in the wild?

The Nektons help locate a legendary Singaporean glass cabinet. However, they discover it is guarded by a terrifying and familiar creature.

The Nektons are busy recovering sunken shipping containers, so when Bethany the fish finds herself in danger, only Jeffrey can save her.

Ant has created a clever machine to clean up a vast oceanic rubbish dump. However, when the machine is been eaten by a huge creature, it's up to the Nektons to save it.