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.
During a space battle over Coruscant between the Galactic Republic and the Separatist Alliance, Jedi Knights Obi-Wan Kenobi and Anakin Skywalker lead a mission to rescue the kidnapped Supreme Chancellor Palpatine from Separatist commander General Grievous. After infiltrating Grievous' flagship, the Jedi engage Count Dooku in a lightsaber duel, which ends with Anakin killing Dooku at Palpatine's urging. Grievous flees the battle-torn cruiser, which the Jedi crash-land on Coruscant. There, Anakin reunites with his wife, Padmé Amidala, who reveals she is pregnant. Initially excited, Anakin begins to have premonitions of Padmé dying in childbirth.
After winning the 74th Hunger Games, Katniss Everdeen and Peeta Mellark return home to District 12. President Snow visits Katniss at her home. The two make an agreement to not lie to one another, and Snow explains that her actions in the Games have inspired rebellions across the districts. He orders her to use the upcoming victory tour to convince him that her actions were out of genuine love for Peeta, not defiance against the Capitol.
The film opens as Ben, Gwen, and Kevin are negotiating with a group of black market dealers, who are attempting to sell them alien nanochips. One of them reveals herself to be Elena, a childhood friend of Ben and Gwen and a fellow Plumber's kid. Elena explains that she had set up the negotiations to lure Ben out into the open, and explains that her father has been abducted and that she needs their help to find him.
In 17,000 B.C., the Seven Primes traveled the galaxy to create Energon with star-absorbing machines called Sun Harvesters. The Primes followed a rule in which to never destroy planets with life, but one of them, later called The Fallen, deceives the others by building an army and sets up a Harvester on Earth. After defeating ancient humans, the Primes defeat and imprison the Fallen before he can harvest the Earth's sun with the Matrix of Leadership. The rest of the Primes sacrifice themselves to hide the Matrix.
Bella awakens from her transformation from human to vampire, aware of her new abilities, but unaware of changes within the coven, such as Jacob having imprinted on her child, Renesmee. It also appears that Bella's father, Charlie, has been attempting to contact the Cullens for updates on Bella's illness. They intend to tell him she didn't survive, which requires that they move out of Forks, Washington to protect their identities. Jacob, desperate not to lose Renesmee, tells Charlie that his daughter is in fact alive and well, and explains that Bella has had to change in order to survive. He morphs into a wolf, revealing his tribe's shape-shifting power, but does not tell Charlie about vampires.
Dominick "Dom" Cobb (Leonardo DiCaprio) and Arthur (Joseph Gordon-Levitt) are "extractors", people who perform corporate espionage using an experimental military technology to infiltrate the subconscious of their targets and extract information while experiencing shared dreaming. Their latest target is Japanese businessman Saito (Ken Watanabe). The extraction from Saito fails when sabotaged by a memory of Cobb's deceased wife Mal (Marion Cotillard). Saito reveals that he was actually auditioning the team to perform the difficult act of "inception": planting an idea in a person's subconscious.
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.
High-school senior Peter Parker visits a genetics laboratory with his friend Harry Osborn and love interest, Mary Jane Watson for a school field trip. There, Peter is bitten on the hand by a genetically engineered "super spider". Shortly after arriving home to his Aunt May and Uncle Ben, he goes unconscious. Meanwhile, Harry's father, scientist Norman Osborn, owner of Oscorp, is attempting to preserve his company's critically important military contract. He experiments on himself with a new but unstable performance-enhancing chemical vapor that increases his speed, strength, and stamina. However, it also drives him insane and he kills his assistant, Mendel Stromm. The next morning, Peter finds that his previously impaired vision has improved and his body has metamorphosized into a more muscular physique. At school, he finds that his body can produce webs and his quickened reflexes let him avoid injury during a confrontation with bully Flash Thompson. Peter discovers he has developed superhuman speed, strength, the ability to stick to surfaces, and a heightened ability to sense danger.
On July 2, a 500 km wide alien mothership enters Earth's orbit and deploys several dozen saucer-shaped "destroyer" spacecraft, each 15 miles (24 km) wide. As they take position over some of Earth's major cities, David Levinson (Jeff Goldblum), an MIT graduate working for a cable company in New York City, discovers hidden transmissions in Earth's satellites which he realizes is a timer counting down to a coordinated attack by the aliens. With the support of his estranged wife Constance Spano (Margaret Colin), the White House Communications Director, he and his father Julius (Judd Hirsch) gain entrance into the Oval Office to notify President Thomas J. Whitmore (Bill Pullman) about the attack. Whitmore orders large-scale evacuations of the targeted cities, but the aliens attack with advanced directed-energy weapons before these can be carried out. Whitmore, portions of his staff, and the Levinsons narrowly escape aboard Air Force One as Washington, D.C. is destroyed.
1926. Norbert Dragonneau rentre à peine d'un périple à travers le monde où il a répertorié un bestiaire extraordinaire de créatures fantastiques. Il pense faire une courte halte à New York mais une série d'événements et de rencontres inattendues risquent de prolonger son séjour. C'est désormais le monde de la magie qui est menacé.
In a California forest, a group of alien botanists collect flora samples. When government agents appear on the scene, they flee in their spaceship, leaving one of their own behind in their haste. The scene shifts to a suburban home, where a 10-year-old boy named Elliott is trying to spend time with his 15-year-old brother, Michael, and his friends. As he returns from picking up a pizza, he discovers that something is hiding in their tool shed. The creature promptly flees upon being discovered. Despite his family's disbelief, he leaves Reese's Pieces candy to lure it to his bedroom. Before he goes to sleep, he realizes it is imitating his movements. He feigns illness the next morning to stay home from school and play with it. Later that day, Michael and their five-year-old sister, Gertie, meet it. They decide to keep it hidden from their mother, Mary. When they ask it about its origin, it levitates several balls to represent its solar system and then demonstrates its powers by reviving a dead chrysanthemum.
In 1957, Indiana Jones and his partner George "Mac" McHale are kidnapped in Nevada by Soviet agents under Colonel Dr. Irina Spalko. The Soviets infiltrate warehouse labeled "Warehouse 51" and force Jones to locate an alien corpse with a crystal skull, recovered ten years earlier. Upon its discovery, Mac reveals he is a double agent working for the Soviets. Jones escapes, unsuccessfully attempts to retrieve the skull, and in a fight with Spalko's sadistic henchman, Colonel Antonin Dovchenko, they both fall onto a rocket sled, which ignites and speeds them away. Jones staggers away and, still pursued, arrives in a model town at the Nevada Test Site, minutes before an atomic bomb test, and takes shelter in a lead-lined refrigerator. Jones is rescued, decontaminated, and arrested by FBI agents, who suspect him of working for the Soviets; and though freed on the recommendation of General Ross, who vouches for him, he is put on indefinite leave of absence from Marshall College.
Le convoi d'Ajax est attaqué par Deadpool. Il commence par massacrer les gardes à l'intérieur d'une voiture, avant de s'en prendre au reste du convoi. Après une longue escarmouche, où il est contraint de n'utiliser que les douze balles qu'il lui reste, Deadpool capture Ajax (de son vrai nom Francis, ce que Deadpool ne cesse de lui rappeler). Après l'intervention de Colossus et Negasonic venus empêcher Deadpool de causer plus de dégâts et le rallier à la cause des X-Men, Ajax parvient à s'échapper en retirant le sabre de son épaule. Il apprend par la même occasion la véritable identité de Deadpool : Wade Wilson.