Arthur, alias Aquaman, est un super-héros dont l'univers de prédilection est le monde aquatique. Préférant vivre dans le monde des humains à la surface, il va être entrainé dans une aventure afin de devenir le roi des océans.
Quelques mois après Hôtel Transylvanie 2, tous les membres de la famille de Dracula et ses amis se réunissent pour partir en vacances à bord d'un luxueux bateau de croisière. Pendant la croisière, Dracula tombe amoureux du capitaine qui n'est autre que la descendante du professeur Van Helsing, le tristement célèbre tueur de monstres.
In the Atlantic Ocean, the USS California submarine picks up incoming human-like threats approaching the sub by sonar. The sub is attacked, leaving the entire crew dead by the invading hostiles. At S.T.A.R. Labs' Justice League headquarters, Cyborg is given news by Colonel Steve Trevor over the sunken sub. Cyborg decides to check it himself, deciding against Trevor's idea of calling the other superheroes, as he puts it "there is no Justice League".
While Scrat inadvertently causes the break up of Pangaea, Manny and Ellie are forced to deal with the trials and tribulations of their teenage daughter Peaches, who has trouble fitting in with her peers. Ellie tries to support her daughter, but Manny becomes exceedingly over-protective. Peaches' friend Louis, a molehog, tries to warn her as she tries to approach a mammoth named Ethan on whom she has a crush. Meanwhile, Sid's family returns, but only long enough to drop off the elderly Granny before abandoning them both. Manny catches Peaches sneaking off to meet Ethan, and leading to an argument and their estrangement. Shortly after, a continental break-up separates Manny from the herd. Trapped on a moving chunk of ice with Sid, Granny, and Diego, Manny has no choice but to ride out the current. Meanwhile, a giant land shift encroaches on Ellie, Peaches, and those remaining on land, causing them to make their way toward the land bridge.
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.
In the timeframe of 10,000 BC, a tribe of hunter-gatherers called the Yagahl live in a remote mountain range in the Urals and survive by killing woolly mammoths, which they call "mannaks". The camp is led by a hunter who has proven his bravery by killing a Mammoth, and taking the White Spear. The people also strongly venerate an elderly woman, called Old Mother. Because of her different appearance to other humans in the village, it is assumed she is a Neanderthal, the "last of her kind", living with the Homo sapiens of the camp.
SpongeBob and Patrick find a piece of an amulet to the lost city of Atlantis, but have no idea what it is. They take it to the Bikini Bottom Museum to see if the staff there know what it is. Patrick and SpongeBob run into Squidward who thinks SpongeBob and Patrick stole the missing half of the amulet. He soon matches it to the displayed other half of the amulet and tells them it was the key to Atlantis. After hearing the story of Atlantis, the only thing SpongeBob and Patrick want to see is the "World's Oldest Bubble." So off goes the Bikini Bottom crew — SpongeBob, Patrick, Squidward, along with Mr. Krabs Sandy and even Plankton are on an adventure to Atlantis.
After the decline in Atlantean culture following the sinking, Kida (Cree Summer), now Queen, and married to Milo Thatch (James Arnold Taylor), is using the heart of Atlantis to restore her city's former glory. Suddenly, Milo's comrades and Mr. Whitmore (John Mahoney) arrive in Atlantis; while their arrival is unexpected, the Atlanteans welcome their old friends. Unfortunately, they have come to inform them of mysterious creature causing trouble on the surface. They arrive in Norway and discover that the mysterious problem is actually the creature known as the Kraken, which had been attacking shipping freighters and taking their cargo to a cliffside village. At first they presume it to be an ancient Atlantean war machine gone rogue (like the Leviathan from the previous film), but they discover that the town magistrate, Edgar Volgud (Clancy Brown), seems to be controlling the Kraken. They soon learn, though, that the Kraken itself is the master, having made a deal with Volgud. When they blow up the Kraken, the man disintegrates and restores the spirit of the village.
A large tidal wave, triggered by a distant explosion, threatens to drown the island of Atlantis. In the midst of an evacuation from the capital city, the Queen of Atlantis is caught by a strange, hypnotic blue light and lifted up into the "Heart of Atlantis", a powerful crystal protecting the city. The crystal consumes her and creates a dome barrier that protects the city's innermost district. She leaves behind her young daughter, Princess Kida (Cree Summer), and her husband, King Kashekim Nedakh (Leonard Nimoy), as the island sinks beneath the ocean.
Demons once ruled mankind under Akivasha, Sorceress Queen of Acheron, until overthrown by the god Valka. The kingdom of Valusia was built on the ruins of Acheron, and Valka left a single flame of Acheron there to burn for eternity as reminder of "godless times".
Un ancien officier de la légion étrangère, Morhange, part à la recherche de son ami Saint Avit perdu dans le désert du Sahara, duquel il reçoit un étrange dessin gravé d'un symbole en forme de croix et du nom « Antinea ».
A group of young people get lost in an underground cavern while exploring a volcano. Eventually they find their way to the lost city of Atlantis, at the center of the Earth.
Wanda Saknussemm (Ireland) is a nerdy social misfit with large glasses and a squeaky voice who lives in Los Angeles and works at a diner. After being dumped by her boyfriend for "not having a sense of adventure", Wanda is informed by a letter that her father, an archaeologist, has died. She flies to northern Africa and while going through her father's belongings, she finds his notes about Atlantis, apparently an alien ship that crashed millennia ago and sank into the center of the Earth. Wanda comes across a chamber beneath her father's apartment and accidentally sets off a chain of events that ultimately cause her to fall into a deep hole.
About 10,000 years ago, peaceful aliens from the planet Antarea set up an outpost on the planet Earth, on an island later known to mankind as Atlantis. When Atlantis sank, twenty aliens were left behind, kept alive in large rock-like cocoons at the bottom of the Atlantic Ocean. Now a group of Antareans have returned to Earth to collect them. Disguising themselves as humans, they rent a house with a swimming pool, and charge the water with "life force" to give the cocooned Antareans energy to survive the trip home. They charter a boat from a local captain named Jack (Steve Guttenberg) who helps them retrieve the cocoons. Jack likes Kitty (Tahnee Welch), a beautiful woman from the team who chartered his boat. When he spies on her while she undresses in her cabin, Jack is shocked when he discovers she is an alien. After the aliens reveal themselves to him and explain what's going on, he decides to help them.
The plot revolves around a summer vacation of Nobita and his friends under the waters of the Pacific Ocean. Gian and Suneo take Doraemon's underwater vehicle and travel through the Atlantic Ocean, trying to find a treasure ship. Along the way, they discover that the environment gun that Doraemon used to protect them is running out of energy leaving them vulnerable to the sea. Fortunately, they are rescued by some marine creatures. Doraemon and his friends are later captured by these creatures, revealed to be inhabinats of the underwater kingdom of Mu. It is revealed that another undersea kingdom, Atlantis, now controlled by robots, was about to destroy the Earth with nuclear weapons after mistaking a volcano eruption for an invasion. With the help of a young boy from Mu, Nobita and his friends attempt to stop the robots, but are all captured. However, when things are at their grimmest, Doraemon's robotic underwater vehicle sacrifices itself to destroy the computer that controlled all the robots and nuclear weapons. After returning to Mu, Doraemon and his friends are hailed as heroes before returning home.