Inspirado no popular romance de Jules Verne, o filme conta a história de um grupo de soldados da guerra civil americana que, após uma desastrosa viagem de balão, acaba indo parar numa ilha do Pacífico, onde se deparam com monstruosos animais e com o famoso capitão Nemo.
A Ilha Tianhuo é tão bonita quanto um paraíso. Quase faz as pessoas esquecerem que está localizado no "Anel de Fogo", o mundialmente famoso cinturão vulcânico da Orla do Pacífico. O vulcão entrou em erupção e o destino das pessoas na ilha foi emaranhado.
As the world progresses into the industrial age, a professor studying the "nature of pure matter" is spirited away by a would-be dictator and connived into building a super-bomb, as a young reporter and a girl rescued from the sea attempt to warn him of their mutual kidnapper's intentions to dominate the world with a new and more-deadly-yet weapon.
During World War II, an American bomber pilot is rescued after drifting at sea aboard a raft. After being administered truth serum, he tells the doctor a story of how he and the three survivors of his plane crash washed up on an island that was inhabited by a tribe of beautiful primitive cave-women, dinosaurs and a group of savage cavemen who are bent on abducting the women for breeding purposes.
On a volcanic island near the Kingdom of Hetvia rules Count Dakkar, a benevolent leader and scientist who has eliminated class distinction among the island's inhabitants. Dakkar, his sister Sonia and her fiance, engineer Nicolai Roget have designed a submarine which Roget pilots on its initial voyage just before the island is overrun by Baron Falon, despotic ruler of Hetvia. Falon sets out after Roget in a second submarine and the two craft, diving to the ocean's floor, discover a strange land populated by dragons, giant squid and an eerie undiscovered humanoid race.
With the help of diver and biologist Laurent Ballesta, a scientific expedition explores three sunken Italian volcanic sites in the Mediterranean.