The Nautilus is ensnared by Gargoyle's super powerful SeaNet magnet. In the fight that follows, Grandis, Sanson and Hanson escape on the Gratan (to help free Nemo and the others from Gargoyle's battleship). The battle culminates with the badly damaged Nautilus plummeting into the sea....

As a result of Nadia's foolishness, the children only have meat for food. This infuriates Nadia so much that she declares to starve... until she becomes desperate to eat a can of rotten spinach, getting sick. Jean sets off to find a cure, only to become intoxicated by hallucinogetic mushrooms(!). Overwhelmingly grateful, and stupidly unaware that Jean is not himself, she gives him his first real kiss....

King gets jealous of Jean and Nadia becoming more intimate and runs away. Jean sets off to find him... but not before Nadia goes ballastic upon realizing that he does not remember the kiss she gave him (he had been stoned from the hallucinogetic mushrooms).

Jean, Nadia, Marie, and King are reunited with Grandis, Sanson, and Hanson. Together they all decide to live as a family on the new island, which Jean theorizes is moving.

Four months afterward, the Gratan is nearly repaired, and soon our pals will set off for Africa. But first Jean and Nadia go off on a hike which leads them to a mysterious underground cavern that turns out to be more than they suspected. The exploration culminates when Nadia falls into a trance and vanishes behind a wall, leaving her clothes in Jean's arms! During all this, Ayerton tries to make his move on Grandis.

The New Nautilus and Gargoyle, now aboard Red Noah, face off in a spectacular duel of pyrotechnics, lasers, and, ultimately, wills. Midway through, both crafts head into outer space. After finally breaking in, Nemo, Jean, and Electra confront Gargoyle, who now has Nadia under his control.