Une des fortes éruptions se produit dans le mont Paektu. Scientifiques et militaires du Corée du Nord et du Sud s’entraident pour prévenir ce catastrophe, car de nouvelles explosions risquent dominer la péninsule coréenne…
On a tropical island in the Pacific, a lonely volcano named Uku watches the wildlife creatures frolic with their mates and hopes to find one of his own. He sings a song to the ocean each day for thousands of years, gradually venting his lava and sinking into the water, but does not realize that an undersea volcano named Lele has heard him every day and has fallen in love with him. She emerges on the day that Uku becomes extinct, but her face is turned away and she cannot see him. Uku sinks fully into the ocean, heartbroken, but revives when he hears Lele singing his song to him. His fires re-ignited, he erupts back to the surface, this time right next to Lele, and the two form a single island where they can be happy together.
It has been four years since the events of the first movie. Seventeen-year-old Sean Anderson (Josh Hutcherson) is caught by the police after a brief chase on his dirtbike which ended with him driving into a swimming pool while trying to evade them. Minutes later, his stepfather Hank (Dwayne Johnson) arrives where a police officer (Stephen Caudill) who is friends with Hank tells him that Sean had broken into a remote satellite research center. The police officer also tells Hank that he has talked Mr. and Mrs. McGillicutty (the owners of the swimming pool) out of pressing charges. Hank takes Sean home where his mother Elizabeth (Kristin Davis) is not pleased with his actions or the fact that he and Hank don't get along well.
Events from the Doomsday Prophecy novel by Rupert Crane begin happening in real life. Eric and Brooke, following instructions left by Crane, work to trigger an anti-doomsday machine and prevent massive destruction.
In 2009, American geologist Adrian Helmsley visits astrophysicist Satnam Tsurutani in India and learns that neutrinos from a massive solar flare are causing the temperature of the Earth's core to rapidly increase. Arriving at a party in Washington, D.C, Helmsley presents his information to White House Chief of Staff Carl Anheuser, who takes him to meet the President.
In the opening scene, Max Anderson (Jean-Michel Paré) is being pursued by a Giganotosaurus. Max then comes across a fissure vent. When he tries to jump across, he falls while calling out the name of his brother. Ten years later, Max's brother volcanologist Trevor Anderson (Brendan Fraser) is visited by Max's son/Trevor's 13-year-old nephew Sean Anderson (Josh Hutcherson). In a box of items that belonged to Max is a book, Journey to the Center of the Earth by Jules Verne. Notes written by Max are found inside the book.
Submersible pilot Toshio Onodera wakes up pinned inside his car in Numazu after an earthquake wreaks havoc in the city and nearby Suruga Bay. As aftershock triggers an explosion, a rescue helicopter led by Reiko Abe saves him and a young girl named Misaki.
Max (Cayden Boyd) is a lonely child in the suburbs of Austin who creates an imaginary world named Planet Drool, where all of his imagination and dreams come to life. He creates two characters; Sharkboy (Taylor Lautner), a young boy who was raised by sharks after losing his father at sea, and Lavagirl (Taylor Dooley), who can produce fire and lava, but has trouble touching objects without setting them alight. The two left Max to guard Planet Drool. In real life, Max's parents (David Arquette and Kristin Davis) have little time for him and their marriage seems to be on the rocks, and he is bullied by fellow schoolmate Linus (Jacob Davich). However, he does receive friendship from Marissa (Sasha Pieterse), the daughter of his teacher Mr. Electricidad (George Lopez, whose name is Spanish for "electricity"). Linus steals Max's Dream Journal (where all of his ideas are kept) and vandalizes it. The next day, a tornado rages outside the school, and moments later, Sharkboy and Lavagirl appear and ask Max to come with them to Planet Drool. They reach Planet Drool via a shark-like spacecraft, where Max learns that the dreamworld is turning bad, courtesy of Mr. Electric (also portrayed by George Lopez), originally the dreamworld's electrician but now corrupted.
The film begins with a group of hooded people in caribou parkas riding through snow on snowmobiles. Arriving at a nearly buried building, inside they find a video recorded journal of a man who appears to be dying. The man in the video reports that the Yellowstone Caldera eruption has affected nearly everything in the United States, burying much of the country under several feet of volcanic ash.
Alors qu'il effectue un reportage sur une éruption volcanique, la vie du journaliste Russell Woods est chavirée lorsque sa femme meurt dans la tragédie. Affligé, il part en Italie afin de découvrir le petit village natal de sa femme. À cet endroit, il est suivi par une étrange petite fille, Angela, dont les villageois présument qu'elle est frappée d'une malédiction diabolique. Malgré les avertissements, Russell est intrigué par la fillette et établit un contact. Pour une raison inexplicable, il est convaincu que la jeune fille est liée, d'une façon ou d'une autre, à la mort de sa femme. Alors que les événements prennent une étrange tournure, Russell réalise que le pire reste à venir. Quelque chose de surnaturel se produit dans le petit village et Angela en est la cause.
Matt Benson est un enquêteur du FBI qui mène une enquête sur l'île de Ginostra, dominée par son volcan menaçant et en collaboration avec la police italienne sur une affaire de règlement de comptes entre mafieux locaux. Une famille a été exécutée et seul le jeune Ettore, âgé de onze ans, est rescapé et aimerait se venger. Benson accueille le garçon dans la maison qu'il loue en compagnie de sa femme sur l'île afin d'obtenir des renseignements de l'enfant. Mais des liens obscurs lient le policier américain avec d'autres habitants de l'île et les motivations des uns et des autres, tout comme celles de la police italienne impuissante devant la mafia ne sont pas simples à comprendre.
Ce film entraîne le spectateur dans l'exploration d'environnements extrêmes méconnus : les profondeurs abyssales grâce à une technologie très sophistiquée. Un voyage à la découverte d'un monde enfoui où toute forme de vie est une démonstration de la capacité des êtres vivants à s'adapter à leur environnement.
Dr. Harry Dalton (Pierce Brosnan), a volcanologist of the United States Geological Survey, and his partner Marianne (Walker Brandt), are studying volcanic activity in Colombia when the volcano erupts. Marianne is killed by a piece of falling debris, leaving Harry remorseful about her death, believing it could have been prevented by evacuating sooner.