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Jean, a young inventor who has just arrived in Paris for an aircraft competition, meets Nadia and his little lion. On their trail there are also Grandis and her members

Jean is hosting Nadia in his home, showing each invention and fleeing Grandis

Jean, Nadia, and King are rescued from the ocean by a passing American battleship called the Abraham

Adrift on the ocean, Jean, Nadia, and King are once again rescued by another vessel - a mysterious submarine commanded by Captain Nemo and his first officer, Electra. The children are kept aboard the submarine for three days while Nemo and his command crew pursue an enemy submarine (the same "sea monster" that wrecked the Abraham). Eventually, Jean, Nadia, and King are released from the submarine and they set off into the sky on Jean's newly revamped aircraft. Before leaving, the children learn that the submarine is known as the Nautilus.

While airborne, Jean, Nadia, and King are shot down from the skies and crash-land onto an unfamiliar island. There, they rescue a 4-year-old lonely little girl named Marie

Investigating the island, Jean discovers a trail of power lines leading to a power plant situated in a deep crater at the center of the island. He also witnesses an escaping villager brutally killed by the pursuing soldiers

Captured by the soldiers (also known as the Neo Atlanteans), Nadia is taken before Gargoyle, who implies that he has known Nadia since she was a baby. He demands his captive to reveal the whereabouts of the Blue Water. When Nadia refuses to obey, Gargoyle threatens to kill both Marie and King. With no choice, Nadia reluctantly admits that Jean has it. The soldiers begin to search the complex for Jean, while the Grandis gang decides to escape. Both sides inadvertently come across each other when they board a freight train bound for Gargoyle's castle. Gargoyle tours Nadia around the compound and introduces its center - a spiral tower known as Babel, which can obliterate anything in its path. That evening he forces Nadia to witness the tower's awesome powers as it demolishes an island in the distance. Out at sea, Captain Nemo sees the same explosion and declares that Gargoyle has "finally released the great abomination."

In an unexpected turn of events, Jean joins forces with the Grandis gang to infiltrate the compound and rescue Nadia. They almost succeed - until Gargoyle's submarine, Garfish corners them at the intake point. Just when it all looks hopeless, the Nautilus rises from the ocean and attacks the Garfish, allowing the companions to make their escape. In the end, Gargoyle attempts to fight back using the Tower of Babel - but it demolishes his compound instead. The islanders are freed, but Gargoyle makes his getaway on a dirigible.

The companions are taken aboard the Nautilus by Captain Nemo in gratitude for their bravery against Gargoyle, and to repair the damage the Gratan has taken. Jean and Hanson are thrilled to be aboard the Nautilus because they are intrigued by its technology

The Nautilus pursues Gargoyle through the LeMar Straits until it runs into a dangerous trap. The submarine is surrounded on all sides by a field of mines, which can be triggered should the underwater current shifts or if the submarine dares to move. In a race against time, Grandis, Sanson, and Hanson propose to use their Gratan to take out three of the mines so that the Nautilus can safely escape from Gargoyle's trap. However, Sanson knocks Grandis out, fearing for her safety. He and Hanson set aboard the Gratan and begin their mission, but the tank begins to malfunction. Jean, who has sneaked aboard the tank, helps the pair as best as he can, but soon the Gratan's underwater camera shatters, leaving the Gratan blind. With Grandis communicating from the Nautilus bridge, the trio barely manages to succeed and save the submarine from a deadly fate.

Jean, Nadia, and the others are appointed as apprentice crew members aboard the Nautilus, each assigned to a different position. Jean, Sanson, and Hanson are given lessons by Sonar Officer Eiko Villan about the Nautilus, Marie and King are schooled by Electra (much to the little girl's infuriating), while Grandis and Nadia work in the rather extraordinary kitchen. Grandis tries to impress Nemo by cooking a (rather ugly) platter of fish, but things don't go as she expects. Later, King snatches Grandis' own dinner and there is a wild chase which results with King ending up in the Nautilus's forbidden engine room. When Jean retrieves him, Nemo explains that the Nautilus is powered by a particle annihilation engine that could potentially take them up to the stars - but also destroy the world if used improperly.

The Nautilus stops by an island for shore leave to take on new supplies. Humorous complications ensue as Jean accidentally stumbles into Nadia changing into her swimsuit, Grandis and Electra get into a jealous rivalry for Nemo's love

Nadia is still angry with everyone over eating the deer, turning a deaf ear to Jean's attempts to reason with her. When Marie innocently states that she "made a grave for the baby deer", Nadia gives the little girl a nasty stare.

As the Nautilus resumes its pursuit of Gargoyle, both Marie and Nadia become seriously ill from a tropical fever that will claim their lives in two days time if they are not cured. The only hope for a cure is in the depths of Reef 64. Alarmed to learn that Nadia is in danger, Nemo decides to change course, much to Electra's infuriation. Accompanied by Nemo, Jean, Sanson, Hanson, and King set off into a dangerous trek through the underwater domain of Reef 64. They find the herb in a cave situation on the opposite side of a cliff face. On their way back, however, they are attacked by a monstrous eel called a "Dinicthys." Jean and King bravely attempt to draw the Dinicthys away from their position by throwing their diving suits' lights into a void. Thanks to help from Nemo, they succeed, and the girls are cured.

Several days later, the Nautilus falls into an even deadlier trap. First, mines drift into the submarine's intakes and disrupt its engines. Then torpedoes narrowly miss the submarine. A Garfish rams into its side, only to have its nose crippled, and the submarine drifts away, exploding. When the Nautilus attempts to surface, it is surrounded by the American fleet, commanded by vengeful Captain Melville, who has received an anonymous tip that the submarine is responsible for sinking the ships. (Naturally, the "source" of this information is Gargoyle.) The subsequent damage causes the Nautilus to drift to the bottom of the ocean. Because the American fleet wants to see them destroyed, the Nautilus is forced to stay underwater until the fleet departs. Prior to this, a genial sailor named Ensign Fait gives Jean a bouquet of man made flowers to offer as a present to Nadia, but she rudely turns it down (it reminds her of the flowers from Gargoyle's garden). In the aftermath of the attack, Fait is trapped inside an engine room poisoned by leaking gas, but Nemo orders the room sealed off so as to prevent further damage. Jean is crushed beyond grief as he painfully listens to his new friend die.

To honor their fallen comrades, the Nautilus sets course for the underwater graveyard of Atlantis.

Jean feels like the Nautilus crew is treating him like a kid and becomes eager to grow up. However, Nemo refuses to make him a crew member, while Electra, and the Grandis gang discourage him even further. Jean is at a loss, until Nadia offers that she has interest in flying again - "only in a craft built by Jean." Inspired, Jean decides to build another aircraft. He aspires to do so all by himself without the help of any grown-ups - a task that he finds more difficult than he anticipated when he can't get an engine to work. Even so, he refuses help from Hanson, straining his friendship with the latter. Later, however, Jean has a change of heart and decides to ask Hanson for help on making the finest aircraft he can. The aircraft is completed, and Jean takes Nadia on a joyous flight above the clouds. In doing so, he manages to impress Nadia and reassure her that he will get her to Africa someday.

To repair the damage caused by the last attack from Gargoyle, Captain Nemo orders the Nautilus to set sail for Antarctica. The passengers are mortified by the thought, especially Sanson, who goes into an exaggerated tirade on what an unstably icy place Antarctica really is. Jean, however, is quite excited by the idea of traveling to a new place. When the submarine arrives at Antarctica, an ancient "shellfish" squid latches onto the Nautilus and threatens to destroy it. The Nautilus attempts to get rid of it by ramming into an iceberg, to no avail. They finally succeed in losing their menace by steering toward an explosive underwater volcano. Unable to endure the excruciating heat, the shellfish lets go and drifts away. The Nautilus then travels through a tunnel to its subterranean base.

While repairs are made to the Nautilus, Nemo takes Jean and Nadia on a tour of his base.

Jean constructs another invention -- a miniature glider powered by a rocket for take off from the Nautilus's deck. Unfortunately, during the test flight, the engine backfires and the glider spirals out of control, finally exploding in the sky

Trapped in the Kermodec Trench by Gargoyle, the Nautilus barely survives a torpedo assault by six Garfish. Nemo retaliates with a torpedo attack that demolishes the fleet.

To save themselves from being totally destroyed by the remaining Garfish fleet, the Nautilus severs its combat block from the main unit, which self-destructs, taking the enemy submarines with it

Jean, Nadia, Marie, and King are shipwrecked and washed ashore on a beach that turns out to be a deserted island. After much discussion, they decide to stay and make it their home.

Nadia rudely awakens Jean and Marie and takes charge, naming their new home "Lincoln Island" after the president of the same name then she abandons them.

Because Nadia has stolen food from their camp, all they have left to eat is meat. Nadia refuses to cooperate and declares instead to starve. Later she becomes desperate and finds a can of spinach

Nadia spends a whole day being romantic with Jean, culminating with another kiss under the stars

A typhoon strikes Lincoln Island, and King is blown away into the night. In the aftermath of the storm, the children are surprised to discover a floating island drifting to their shore.

giant appears out of nowhere and terrorizes the companions. which turns out to be the Gratan disguised in cloth, and sure enough, Grandis, Sanson, and Hanson are there.

Sanson and Hanson get into an argument that turns into a race between two mechanical lions resembling King.

Four months later, the Gratan has finally been repaired and the companions will soon set off for Africa. But first the balloon must be repaired

Trapped in a strange void, Nadia comes into contact with a mysterious voice who tells her that she is actually aboard Red Noah

The Gratan crash-lands into a tribal village, and the companions are captured. until one of its citizens recognizes both Nadia and her Blue Water.

King is captured by Grandis' ex-fiance, and the companions form a rescue operation to free him.

Most of this episode is a "clip show" featuring "image songs" accompanied by clips from the previous thirty-three episodes

Finally, the companions arrive at Tartessos, the ancient kingdom of Atlantis submerged to the bottom of a crater lake thirteen years ago.

he companions to Tartessos. Nadia surrenders herself and the Blue Water to Gargoyle

Nadia is brought aboard Red Noah again, this time as it hovers in the sky, dwarfing even Gargoyle's battleships. There Gargoyle shows Nadia the ancient history of Atlantis

Both Red Noah and New Nautilus exchange laser fire and turret blasts in the sky. The subsequent battle causes much damage to the streets of Paris, destroying the Eiffel Tower.

Inside "Red Noah" Gurgoile threatens Captain Nemo, Electra and Jean. When Captain Nemo asks Jean to shoot Nadja and Neo, he is unable to comply with the request.