When Ant discovers an ancient scroll that holds clues to an amazing mystery, his family comes face to face with a menacing dragon.
The Nektons have their hands full when they're caught between the Dark Orca pirates and an erupting undersea volcano.
The sub's artificial intelligence system puts the Nektons on lockdown when they try to leave on a risky mission to rescue a kayaker.
Will and Ant head to the deepest part of the ocean to retrieve a mysterious item, but it turns out they've been tricked.
Ant thinks that aliens are stealing things from a Japanese island and dragging them underwater. But the Nektons uncover something even more dangerous.
Someone just stole the rarest tortoise in the world and the Nektons are searching for it. But the thief secretly wants to capture them, too!
Captain Hammerhead captures the Nektons. But when his sub starts to sink, they're the only ones who can save the day!
The Nektons explore an underwater cave system, and Ant bonds with a baby crocodile. But the creature's mother isn't very happy about that.
To find a piece of the mysterious Ephemychron, the Nektons have to fight off whirlpools, zero visibility and giant robotic jellyfish!
Ant and Fontaine hunt for the rare colossal squid. But it turns out to be smarter than anyone expected and thinks the Nektons look very tasty!
Celebrity monster hunter Devil Daniels sets his sights on a sea creature that he believes is a menace. But the Nektons want to protect it.
Ant thinks a ghost sub is haunting the depths of the ocean. But he and Fontaine discover that the truth is even stranger.
As the Nektons explore a mysterious tunnel behind a huge undersea waterfall, strange creatures and strong currents surprise them at every turn.
Strange things begin happening to the Nektons when they explore a sinkhole in the middle of the sea. And now they can't find their way out!
Dolos sells two maps leading to the same treasure: one to the Nektons, and the other to the pirates! Now it's a race to see who gets there first.
When four members of the Junior Nekton fan club visit the Aronnax, Ant and Fontaine realize that looking after kids is a lot harder than they thought.
The police accuse Ant of stealing and won't let him leave the Aronnax. But he and Fontaine escape and try to clear his name.
Fontaine and Smiling Finn get stuck inside a giant clam as the Dark Orca pirates battle the Nektons for the huge pearl it holds.
When the Nektons head to Loki's castle in search of Viking treasure, Captain Hammerhead and his pirate crew take over the Aronnax.
Devil Daniels thinks he's hunting a mythical creature called a siren. But the Nektons realize it's actually a rare whale with a unique voice.
Fontaine suspects that a single fish is to blame for wrecking Dolos's boat, sinking the Aronnax and almost destroying the Rover.
When a huge prehistoric shark swallows the Rover, Will and Fontaine cling to the gills inside its mouth. But they can't hang on forever!
The Nektons try to identify a unique life form. But just as Ant figures out what it is, an underwater mining machine threatens to destroy it.
Proteus, leader of the mysterious Guardians, traps the Aronnax in a magnetic field and kidnaps Ant, believing he is the key to finding Lemuria.
A weird fish attracts all the other fish with its hypnotic glow. When Kaiko and Will also fall under its spell, Ant and Fontaine must rescue them.
The Nektons explore a floating island and find the final piece of the Ephemychron in a cave. But the island is moving! What is its secret?
When a fallen satellite's fuel threatens marine life, the Nektons try to stop it, but encounter Alpheus Benthos, an adversary who seems to know Ant.
Ant is certain the Baltic Sea Anomaly is an ancient UFO, but when the Nektons arrive they encounter something more recognizable, and more dangerous.
While looking for the kidnapped Prof. Fiction and Fontaine, Ant is sure he sees a mermaid. But then he ends up in a difficult situation of his own.
The Aronnax is stuck in the Bermuda Triangle, where everything is upside down and only Ant's fish Jeffrey can save them — unless Alpheus has his way.
A giant monster roaming the ocean floor attacks the Aronnax, and the Nektons' friend Kenji may have more to do with it than anyone imagined.
The Nektons take in pirate Hammerhead's son Finn, who's trying to stop his dad from stealing a treasure, but he unleashes a pirate curse instead.
When Kaiko sends out a distress signal, Will, Fontaine and Ant go to her rescue and find an ancient underground temple that seems to be under attack.
Another encounter with archrival Alpheus puts the Nektons at risk of never finding the Lemuria, but Ant is determined not to let that happen.
When a shape-shifting undersea maze traps the Nektons, Will deduces it's part of an ancient myth, while Ant gets navigation tips from dolphins.
The Nektons encounter a white whale that Ant's sure is Moby Dick, and that gets monster hunter Devil Daniels interested in capturing the famed mammal.
The Nektons find Hammerhead's deserted pirate ship and discover an eerie presence that forces them to join forces with Hammerhead's family to save it.
The Aronnax races to Catatumbo Bay to investigate an ancient electrical storm that's getting dangerously strong, all because of a huge electric ray.
Alpheus has finally found the gates to Lemuria, and the Nektons must stop him before he unleashes powers on the world that even he can't control.
When the Dark Orca pirates steal an ancient chest that can awaken a Monumential, the Nektons race to retrieve it.
After the sub’s Internet goes out, Ant and Fontaine come face-to-face with a giant sea creature in attempts to get it back.
Ant and Fontaine bravely embark on a risky rescue mission. Luckily, an underwater friend comes to their aid!
Alongside a familiar enemy, the Nektons are trapped inside an inescapable Monumential. But they have no plans of becoming fish food.
When devious celebrity sea explorer Devil Daniels lures a killer whale for fame, Ant works to expose his bad deeds — and save the orca.
When the Dark Orca crew interrupts a mating ritual to steal gold dust, the Nektons work to keep the bad guys from ruining the romance.
Ant tries to capture a special sea horse for Fontaine’s birthday but he must race against relentless poachers who are hunting the endangered species.
To save Guardian Glaucus' island from a natural disaster, the Nektons search for the only object that can protect his home.
Ant thinks he can swim faster than the fastest fish in the sea, but a deadly oil spill slips him up.
When the Dark Orca pirates steal Jeffrey, the family attempts to save Ant’s pet. Jeffrey takes matters into his own fins.
While the Nektons fight to stop a massive Monumential from reaching the Lemurian gates, they discover a revealing clue tied to Lemuria's location.
When the Nektons finally discover the ancient city, poisonous algae threatens the family's exploration.
The Nektons get their hands on a magical shaft and try to summon its power to help put the Monumentials and the Kraken back into a deep slumber.