Après les évènements de Sokovie et l'affrontement avec Ultron, Thor est parti à la recherche des Pierres d'Infinité. Deux ans après, sans résultat, on le retrouve emprisonné dans le monde de Surtur (Muspellheim). Il se libère et vainc le démon enflammé, après que ce dernier lui a appris qu'Asgard est sans défense en l'absence du « Père de Toute Chose », Odin. Thor lui arrache sa couronne que le démon comptait unir avec l'Éternelle Flamme afin de provoquer le Ragnarök, la destruction d’Asgard.
Vivant à Paris où elle travaille au musée du Louvre, Diana Prince reçoit de la part de Bruce Wayne une photographie la montrant au front lors de la Première Guerre mondiale aux côtés de Steve Trevor et ses amis. Elle se remémore alors sa jeunesse sur l'île de Themyscira, parmi les Amazones, qu'elle a quittée pour affronter Arès, le dieu de la guerre, et devenir Wonder Woman.
Eons ago, Bor, father of Odin, clashes with the Dark Elf Malekith, who seeks to destroy the universe using a weapon known as the Aether. After conquering Malekith's forces, including enhanced warriors called the Kursed, on their home world of Svartalfheim, Bor safeguards the Aether within a stone column. Unbeknownst to Bor, Malekith, his lieutenant Algrim, and a handful of Dark Elves escape into suspended animation.
The opening scene shows the troops of Agamemnon of Mycenae ready to fight against the troops of Triopas of Thessaly. Afterwards, Prince Hector of Troy and his younger brother Paris negotiate a peace treaty with Menelaus, king of Sparta, and celebrate the end of a long and bloody war. Paris, however, is having a secret love affair with Menelaus' wife, Queen Helen, and smuggles her aboard their homebound vessel, much to Hector's fury, as this could lead to war between Troy and Greece. Upon learning of this, Menelaus meets with his elder brother, King Agamemnon of Greece, and asks his help in taking Troy. Agamemnon, who has wanted to conquer Troy for a long time, agrees, since it will give him control of the Aegean Sea. On King Nestor's advice, Agamemnon has Odysseus, King of Ithaca, persuade Achilles to join them. Achilles, who strongly dislikes Agamemnon and his ways, initially refuses, but eventually decides to go after his mother, Thetis, tells him that though he will die, he will be forever remembered.
In 965 AD, Odin, king of Asgard, wages war against the Frost Giants of Jotunheim and their leader Laufey, to prevent them from conquering the nine realms, starting with Earth. The Asgardian warriors defeat the Frost Giants and seize the source of their power, the Casket of Ancient Winters.
In 3067 BC, the Scorpion King leads his army on a campaign to conquer the world. After fighting for seven years, his army is defeated while attacking Thebes and exiled to the desert of Ahm Shere; his men die of heat exhaustion. After vowing to give Anubis his soul for the power to defeat his enemies, an oasis forms to hide the Scorpion King's pyramid and he is given a legion of jackal warriors in Anubis' image. The Army of Anubis sweeps across Egypt, but once their task is finished, Anubis claims the Scorpion King's soul and his army.
In Thebes, Egypt, 1290 BC, high priest Imhotep engages in an affair with Anck-su-Namun, the mistress of Pharaoh Seti I. When the Pharaoh discovers their tryst, Imhotep and Anck-su-Namun kill him. As Seti's guards arrive, Imhotep flees while Anck-su-Namun kills herself, intending for Imhotep to resurrect her. After Anck-su-Namun's burial, Imhotep and his priests steal her corpse and travel to Hamunaptra, the city of the dead, where they begin the resurrection ceremony. However, the group is intercepted by Seti's bodyguards, the Medjai, before the ritual could be completed, and Anck-su-Namun's soul is sent back to the Underworld. Imhotep's priests are all mummified alive. Imhotep himself is sentenced to immortal agony, condemned to suffer the Hom Dai curse: having his tongue removed and then being buried alive with flesh eating scarab beetles. Imhotep is buried under high security, sealed away in a sarcophagus at the feet of a statue of the Egyptian god Anubis, and kept under strict surveillance by the Medjai, since if Imhotep were ever to resurrect, the entire world would be doomed.
En 1127, un groupe de croisés anglais cache un rubis de l'Égypte antique dans la tombe d'un des leurs. De nos jours, à Londres, un chantier ferroviaire souterrain pour le Crossrail met à jour leur catacombe.
Stanley Ipkiss is a shy and unlucky bank clerk working at the local Edge City bank. He is frequently picked on by everyone around him like the Bank President's son Mr. Dickey, his ruthless landlady Mrs. Peenman, and the mechanics Irv and Burt Ripley who ripped him off. The only exception of this is his Jack Russell Terrier Milo and his co-worker and best friend Charlie Schumaker. Meanwhile, gangster Dorian Tyrell operates a nightclub called the Coco Bongo while plotting to overthrow his boss Niko. One day, Tyrell sends his singer girlfriend Tina Carlyle into Stanley's bank to record its layout, in preparation to rob the bank.
After the Huns, led by the ruthless Shan Yu, invade Han China, the Chinese emperor begins to command a general mobilization. Each family is given a conscription notice, requiring one man from each family to join the Chinese army. When Fa Mulan hears that her elderly father Fa Zhou, the only man in their family, is once more to go to war, she becomes anxious and apprehensive. She decides to deal with this herself by disguising herself as a man so that she can go to war instead of her father. When her family learns of Mulan's departure, they all become anxious. Grandmother Fa, Mulan's grandmother, prays to the family ancestors for Mulan's safety. The ancestors then order their "Great Stone Dragon" to protect Mulan. The ancestors are unaware that the statue of Great Stone Dragon failed to come to life, and that Mushu, a small dragon, is the one to go and protect Mulan.
Perseus (Sam Worthington), a son of Zeus (Liam Neeson), lives as a fisherman after the death of his wife, Io (portrayed by Gemma Arterton in the previous film), with his young son, Helius (John Bell). Zeus visits Perseus and asks for his help, saying that humans are not praying to the gods and as a result the gods are losing their power and becoming mortal. Perseus realizes the walls of Tartarus are crumbling and Zeus informs him that the imprisoned Titan Kronos will soon be free. Perseus, valuing his family's safety, refuses to get involved.
After imprisoning the Titans beneath the ocean, the Greek gods gather to Mount Olympus for Zeus, and his wife Hera have a son named Hercules. While the other gods are joyful, Zeus' jealous brother Hades plots to overthrow Zeus and rule Mount Olympus. Turning to the Fates for help, Hades learns that in eighteen years, a planetary alignment will allow Hades to locate and free the Titans to conquer Olympus, but only if Hercules does not interfere. Hades sends his minions Pain and Panic to dispose of Hercules. The two succeed at kidnapping and feeding him a formula that turns him mortal, but fail to remove his superhuman strength before Hercules is found and adopted by the farmers Amphitryon and Alcmene.
Director John Woo said in an interview with David Stratton that the film is only 50% factual. Woo decided to alter the story using modern feelings and his own feelings for a more worldly acceptance. According to Woo, historical accuracy was less important than how the audience felt about the battle.
Hercules (Dwayne Johnson) is the leader of a band of mercenaries comprising the spear-wielding prophet Amphiaraus (Ian McShane) of Argos, the knife-throwing thief Autolycus (Rufus Sewell) of Sparta, the feral warrior Tydeus (Aksel Hennie) of Thebes, the Amazon archer Atalanta (Ingrid Bolsø Berdal) of Scythia and his nephew storyteller Iolaus (Reece Ritchie) of Athens. Hercules is said to be the demigod son of Zeus, who completed the legendary Twelve Labors, only to be betrayed by Hera who drove him insane and caused him to murder his wife Megara (Irina Shayk) and their children during a visit to King Eurystheus (Joseph Fiennes). Throughout the film, it is not clearly established that Hercules is truly the son of Zeus, and many are skeptical of the claim as well as of the stories of Hercules' famous Twelve Labors. Despite this, Hercules is frequently seen displaying unusual strength and nigh-unmatched skill in combat. Hercules is frequently haunted by the memory of the deaths of his wife and daughters by his hand, as well as visions of Cerberus.
In ancient times after defeating their predecessors, the Titans, the gods divided the Universe among themselves. Zeus took the skies, Poseidon took the seas, and Hades was left with the Underworld upon being tricked by Zeus. The gods created the mortals, whose faith and prayers assured the gods' immortality. As time passed, however, mortals began to question them and soon resist their creators, angering the Olympians.