The Nektons try to stop fuel from a fallen satellite polluting a marine sanctuary. But they encounter a mysterious new adversary, Alpheus Benthos, who is intent of finding Lemuria before them.
Is the Baltic Sea Anomaly really a UFO that crashed into the ocean 600 years ago? Ant thinks it is. But what the Nektons find inside is even more strange and frightening.
Mermaids don't exist - right? Well, if that's true, then what's that mermaid-shaped thing swimming outside the Aronnax? Ant is determined to find out, even when pirates get in his way.
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 seem to escape. Can it be that Jeffrey has to save the day?
A giant, upright monster, straight out of a monster movie, is walking across the ocean floor, causing havoc. Kaiko knows this isn't a normal sea-creature. But what is it? And how can it be stopped?
Pirate boy Smiling Finn comes to the Nektons pleading for help. He wants them to stop his father, Captain Hammerhead, from stealing a treasure that he believes will destroy his family.
A mysterious, ancient temple beneath the sea has been hidden for centuries. The Nektons discover it was hidden for a very good reason and the local sea-life protect it at all costs.
The Nektons arch enemy Alpheus Benthos wants to stop them from ever finding Lemuria. He returns to steal the Ephemychron from them. 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 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 realise they must save it.
The Nektons find the Dark Orca pirate submarine completely deserted. It's as if the pirate crew have just abandoned it. But why? And what are those mysterious, ghostly sounds?
Catatumbo Bay is the site of a lightning storm that has been going for hundreds of years. The Nektons investigations lead them to discover 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. But Alpheus unleashes forces he cannot control.