L'univers de Star Wars se déroule dans une galaxie théâtre d'affrontements entre les Chevaliers Jedi et les Seigneurs noirs des Sith, personnes sensibles à la Force, un champ énergétique mystérieux leur procurant des pouvoirs psychiques. Les Jedi maîtrisent le côté lumineux de la Force, pouvoir bénéfique et défensif, pour maintenir la paix dans la galaxie. Les Sith utilisent le côté obscur, pouvoir nuisible et destructeur, pour leur usage personnel et pour dominer la galaxie. Les Sith vont par deux : un maître et un apprenti.
L'univers de Star Wars est amorcé avec le conflit entre la République galactique et la Confédération des systèmes indépendants, alliance de planètes séparatistes. Cette confédération entraîne des dirigeants de la République dans des affaires ingérables à cause des manigances du Chancelier Suprême Palpatine, chef d'État de la République, qui dit servir la démocratie tout en visant secrètement à établir un empire. Pour rétablir la paix, les Jedi combattent les ennemis de la République, sans savoir que les deux camps sont manipulés par les Seigneurs Sith (Palpatine étant en réalité le Seigneur Sith Dark Sidious). Les Jedi, comme les Sith, sont sensibles à la Force, une capacité d'origine physiologique qui permet à leurs détenteurs d'acquérir certains pouvoirs surnaturels.
During the Clone Wars, Jedi Knights Anakin Skywalker and Obi-Wan Kenobi lead a small Republic clone army against the Separatist droid army on the planet Christophsis. Awaiting reinforcements, the two Jedi greet a shuttle carrying the young Jedi Ahsoka Tano, who insists that she has been assigned by Jedi Master Yoda to serve as Anakin's Padawan. Anakin begrudgingly accepts Ahsoka's apprenticeship, and the two succeed in deactivating the Separatists' energy field while Obi-Wan stalls the droid army commander, allowing a Republic victory.
In response to taxation on trade routes in the Galactic Republic, the Trade Federation organizes a blockade of battleships around the planet Naboo. Supreme Chancellor Valorum dispatches Jedi Master Qui-Gon Jinn and his apprentice Obi-Wan Kenobi to negotiate with the Trade Federation leadership to end the blockade. Darth Sidious, a Sith Lord and the Trade Federation's secret adviser, orders Federation Viceroy Nute Gunray to kill the Jedi and invade Naboo with an army of battle droids. The Jedi flee to Naboo, where Qui-Gon saves Gungan outcast Jar Jar Binks from being killed during the invasion. Indebted to the Jedi, Jar Jar leads them to an underwater Gungan city. There the Jedi try but fail to persuade the Gungan leader, Boss Nass into helping the people of Naboo, though they are able to obtain transportation to Theed, the capital city on the surface. They rescue Queen Amidala, the ruler of the Naboo people, and escape the planet on her royal starship, which is damaged as they pass the Federation blockade.
Ten years after the Trade Federation's invasion of Naboo, the Galactic Republic is threatened by a Separatist movement organized by former Jedi Master Count Dooku. Senator Padmé Amidala comes to Coruscant to vote on a plan to create an army of the Republic to assist the Jedi against this threat. Narrowly avoiding an assassination attempt upon arrival, she is placed under the protection of Jedi Knight Obi-Wan Kenobi and his apprentice Anakin Skywalker. The two Jedi thwart another attempt on her life and subdue the assassin, Zam Wesell, a shape-shifter who is killed by her bounty hunter client with a toxic dart before she can reveal his identity. The Jedi Council assigns Obi-Wan to identify and capture the bounty hunter, while Anakin is assigned to escort Padmé back to Naboo, where the two fall in love.
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.
In the 23rd century, Earth has become a space-faring federation. While colonizing new planets, humans have encountered an insectoid species known as Arachnids or "Bugs", with their home being the distant world Klendathu. The bugs appear to be little more than killing machines, though there are suggestions that they were provoked by the intrusion of humans into their habitats.
On an asteroid, the Terran Federation's Fort Casey is crawling with bugs. The starship Alesia begins to deploy its Mobile Infantry troopers, by dropship, to seize and control the hangar and rescue any survivors. Lieutenant Daugherty's 'Alpha' team lands and immediately engages bugs, fighting through to rendezvous with the surviving Fort Casey troopers. After setting explosives charges, the troopers head to the starship John A. Warden for evacuation, only to see it leave dock without them – Minister Carl Jenkins has commandeered the Warden from Captain Carmen Ibanez, sending her to Alesia. Before leaving, Jenkins orders that Major Henry "Hero" Varro, the commander of Fort Casey's K-12 troopers, be escorted to Alesia as a prisoner. Alesia docks with Fort Casey for emergency evacuation of the surviving troopers, and the Fort Casey asteroid is successfully destroyed.
Alors que la guerre contre les arachnides fait rage, le général Johnny Rico est rétrogradé au rang de colonel et envoyé sur Mars entraîner un groupe de nouvelles recrues pour avoir laissé une reine arachnide atteindre la Terre. Pendant que la Fédération attaque la planète mère des insectes, ces derniers envahissent Mars, menaçant la Terre et plongeant l'équipe du colonel Rico au coeur de l'action. Mais les Arachnides ne sont pas la seule menace qui pèse sur la planète rouge...
On a planet inhabited by Arachnids, a squad of soldiers find themselves pinned down and surrounded on all sides by Arachnid forces—even with their new laser gun technology and assistance from psychic soldiers, the Arachnid assault overwhelms them. General Jack Shepherd (Ed Lauter) decides to make a last stand with four of his best soldiers to allow the majority of his surviving troops to escape. The plan works and the soldiers escape, including Sergeant Dede Rake (Brenda Strong), psychic Lieutenant Pavlov Dill (Lawrence Monoson), Private Jill Sandee (Sandrine Holt) and her lover Private Duff Horton (Jason-Shane Scott), and Private Lei Sahara (Colleen Porch). Despite reaching relative safety, the team is whittled down by deadly storms and arachnid ambushes—including the only member of the platoon with a radio, Corporal Thom Kobe (Brian Tee). Lieutenant Dill is unable to command his soldiers as he receives traumatic visions of utter annihilation. He takes his anger out on Private Sahara, who is revealed to have been psychic but lost reliable control of her psychic abilities during puberty.
In the past eleven years of "The Second Bug War", the Mobile Infantry has improved their weapons and tactics. However, as they adapt, so do the Bugs, and many new Arachnid variants have developed. The United Citizen Federation now finds itself engaged in trench warfare on the frontier planets. The Federation puts a positive spin on this in the media while using its judicial and military authority to suppress peace protesters and religious fanatics as seditionists.
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.
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.
Après les évènements de Sokovie et l'affrontement avec Ultron, Thor est parti à la recherche des Pierres d'Infinité. Deux ans plus tard, sans résultat, il finit 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.