In a penal colony, Nemo plans an escape on the submarine he designed; when ordered to move early, he leaves with few prisoners as crew, on their way, they collide with a ship.
When Company troopers find the Nautilus, Nemo must motivate the team to work with each other so they can get to the open seas before they're exhausted.
Captain Nemo and his starving crew go ashore on a seemingly deserted island in search of food; when Blaster goes missing, Nemo and Humility embark on a daring rescue mission but soon encounter a giant electric eel.
An eerie red glow prompts the big eel to quickly let go of the Nautilus; a series of underwater volcanoes erupts and without power, the Nautilus keeps sinking towards the lava.
The Ring of Fire reveals a clue to the fabled underwater city of Atlantis; a small party ventures out to discover what seems to be an ancient outpost of the mythical lost civilization.
Elmo and Gabrielle use leaves and rocks found in nature to play tic-tac-toe; when Elmo's leaf pieces get blown away due to a strong wind, they find something else he can use.
Nemo's recklessness leads to a mutiny under the ice; Nemo must tell his crew who he really is; Boniface takes over as captain.
The Nautilus reaches the Pillars of Halvar but finds that the treasure is guarded by a fearsome band of Valkyrie warriors; they capture the crew in a stealth attack underwater; on trial for his life, Nemo must rely on the testimonies of the crew.
The Nautilus crew spreads rumors that the East India Mercantile Company is failing; when stock prices plunge, a shareholder meeting is called; Nemo and crew have hours to scheme their way into that meeting, so they can dissolve the Company forever.
Based on the classic novel Twenty Thousand Leagues Under the Sea; join Nemo and a band of outsiders on an epic journey to discover the lost underwater city of Atlantis.