Ant and Fontaine search for their missing fish Jeffrey and try to tackle a plastic pollution crisis in the oceans.

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?

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

The Dark Orca pirates unwittingly steal a treasure that could awaken a monumential!

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?

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.

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?

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.

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

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. Show more

The Nektons explore Lemuria but Fontaine realises the others are being affected by a dangerous algae. Can she find an antidote?

The Nektons return to the mysterious Lemurian Gates they found previously. Exploring within, they’re stunned to discover Lemuria is here!

The Nektons find the Queen’s sceptre. But faced with the Kraken and the Electric Ray Monumential together, can Ant make it work?

Ant and Fontaine realise that their grandparents found Lemuria before them - but where are they now? Show more

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?

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

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.

Mad Madeline steals the dangerous Sceptre of Queen Dorius.

Three baby monumental turtles hatch, and they are the size of city blocks! The playful babies accidentally sink a fishing trawler! Show more