Marvel Cinematic Universe

Genius, billionaire, playboy, and philanthropist Tony Stark, who has inherited the defense contractor Stark Industries from his father, is in war-torn Afghanistan with his friend and military liaison, Lieutenant Colonel James Rhodes to demonstrate the new "Jericho" missile. The convoy is ambushed and Stark is critically wounded by one of his own rocket propelled grenades. He is captured and imprisoned in a cave by the terrorist group the Ten Rings, and an electromagnet is grafted into his chest by fellow captive Yinsen to keep the shrapnel shell shards that wounded him from reaching his heart and killing him. Ten Rings leader Raza offers Stark freedom in exchange for building a Jericho missile for the group, but Tony and Yinsen agree Raza will not keep his word. Stark and Yinsen secretly build a powerful electric generator called an arc reactor to power Stark's electromagnet and a suit of powered armor to aid in their escape. Although they keep the suit hidden almost to completion, the Ten Rings attack the workshop when they discover their intentions. Yinsen sacrifices himself to divert them while the suit powers up. The armored Stark battles his way out of the cave to find the dying Yinsen, then in anger burns the Ten Rings weapons and flies away, crashing in the desert and destroying the suit. After being rescued by Rhodes, Stark returns home and announces that his company will no longer manufacture weapons. Obadiah Stane, his father's old partner and the company's manager, advises Stark that this may ruin Stark Industries and his father's legacy. In his home workshop, Stark builds an improved version of his suit, as well as a more powerful arc reactor for his chest. Personal assistant Pepper Potts places the original reactor inside a small glass showcase. Though Stane requests details, Stark keeps his work to himself. At a charity event held by Stark Industries, reporter Christine Everhart informs Stark that his company's weapons, including the Jericho, were recently delivered to the Ten Rings and are being used to attack Yinsen's home village, Gulmira. Stark also learns Stane is trying to replace him as head of the company. Enraged by these revelations, Stark dons his new armor and flies to Afghanistan, where he saves Yinsen's village. While flying home, Stark is shot at by two F-22 Raptor fighter jets. He reveals his secret identity to Rhodes over the phone in an attempt to end the attack. Meanwhile, the Ten Rings gather the pieces of Stark's prototype suit and meet with Stane, who subdues Raza with a sonic device and has the rest of the group killed. Stane has a new suit reverse engineered from the wreckage. Seeking to find any other weapons delivered to the Ten Rings, Stark sends Pepper to hack into the company computer system from Stane's office. She discovers Stane has been supplying the terrorists and hired the Ten Rings to kill Stark, but the group reneged. Potts meets with Agent Phil Coulson of S.H.I.E.L.D., a counter-terrorism agency, to inform him of Stane's activities. Stane's scientists cannot duplicate Stark's arc reactor so Stane ambushes Stark at home and takes his, though Stark manages to get to his original reactor to replace the taken one. Potts and several S.H.I.E.L.D. agents attempt to arrest Stane, but he dons his suit and attacks them. Stark fights Stane, but is outmatched without his new reactor to run his suit at full capacity. Stark lures Stane atop the Stark Industries building and instructs Potts to overload the large arc reactor there. This unleashes a massive electrical surge that causes Stane and his armor to fall into the exploding reactor, killing him. The next day, at a press conference, Stark admits to being the superhero the press has dubbed "Iron Man". In a post-credits scene, S.H.I.E.L.D. Director Nick Fury visits Stark at home, telling him that Iron Man is not "the only superhero in the world", and explaining that he wants to discuss the "Avengers Initiative".

At Culver University in Virginia, General Thunderbolt Ross meets with Dr. Bruce Banner, the colleague and lover of his daughter Betty, regarding an experiment that Ross claims is meant to make humans immune to gamma radiation. The experiment — part of a World War II era "super soldier" program that Ross hopes to recreate — fails, and the exposure to gamma radiation causes Banner to transform into the Hulk for brief periods of time, whenever his heart rate rises above 200. The Hulk destroys the lab and injures or kills the people inside. Banner becomes a fugitive from the U.S. military and Ross in particular, who wants to weaponize the Hulk process. Five months later, Banner works at a bottling factory in Rocinha, Rio de Janeiro in Brazil, while searching for a cure for his condition. On the Internet, he collaborates with a colleague he knows only as "Mr. Blue", and to whom he is "Mr. Green". He is also learning meditative breathing techniques to help keep control, and has not transformed in 158 days. After Banner cuts his finger, a drop of his blood falls into a bottle, and is eventually ingested by an elderly consumer in Milwaukee, Wisconsin, giving him gamma sickness. Using the bottle to track down Banner, Ross sends a SWAT team, led by Russian-born British Royal Marine Emil Blonsky, to capture him. Banner transforms into the Hulk and defeats Blonsky's team. After Ross explains how Banner became the Hulk, Blonsky agrees to be injected with a small amount of a similar serum, which gives him enhanced speed, strength, agility, and healing, but also begins to deform his skeleton and impair his judgment. Banner returns to Culver University and reunites with Betty, who is dating psychiatrist Leonard Samson. Banner is attacked by Ross and Blonsky's forces, tipped off by the suspicious Samson, causing him to again transform into the Hulk. The ensuing battle outside the university proves to be futile for Ross' forces and they eventually retreat, though Blonsky, whose sanity is starting to falter, boldly attacks and mocks the Hulk. The Hulk apparently kills Blonsky and flees with Betty. After the Hulk reverts to Banner, he and Betty go on the run, and Banner contacts Mr. Blue, who urges them to meet him in New York City. Mr. Blue is actually cellular biologist Dr. Samuel Sterns, who tells Banner he has developed a possible antidote to Banner's condition. After a successful test, he warns Banner that the antidote may only reverse each individual transformation. Sterns reveals he has synthesized Banner's blood samples, which Banner sent from Brazil, into a large supply, with the intention of applying its "limitless potential" to medicine. Fearful of the Hulk's power falling into the military's hands, Banner wishes to destroy the blood supply. Meanwhile, Blonsky is revealed to have survived the battle and has completely healed. He joins Ross' forces for a third attempt to take Banner into custody. They succeed and Banner, along with Betty, are taken away in a helicopter. Blonsky stays behind and forces Sterns to inject him with Banner's blood, as he covets the Hulk's power. Sterns warns that the combination of the super-soldier formula and Banner's blood may cause him to become an "abomination", but Blonsky insists. The experiment mutates Blonsky into a creature with size and strength surpassing that of the Hulk, but drives him mad. He attacks Sterns, who gets some of Banner's blood in a cut on his forehead, causing him to begin mutating as well. Blonsky then rampages through Harlem. Realizing that the Hulk is the only one who can stop Blonsky, Banner convinces Ross to release him. He jumps from Ross' helicopter and transforms after hitting the ground. After a long and brutal battle through Harlem, the Hulk defeats and nearly kills Blonsky, relenting only after Betty's plea to spare him. After having a small, peaceful moment with Betty, the Hulk flees from New York. A month later, Banner is in Bella Coola, British Columbia. Instead of trying to suppress his transformation, he successfully transforms in a controlled manner. In a final scene, Tony Stark approaches Ross at a local bar and informs him a team is being put together.

In Russia, the media covers Tony Stark's disclosure of his identity as Iron Man. Ivan Vanko, whose father Anton Vanko has just died, sees this and begins building a miniature arc reactor similar to Stark's. Six months later, Stark is a superstar and uses his Iron Man suit for peaceful means, resisting government pressure to sell his designs. He re-institutes the Stark Expo in Flushing Meadows to continue his father Howard's legacy. The palladium core in the arc reactor that keeps Stark alive and powers the armor is slowly poisoning him, and he cannot find a substitute. Growing increasingly despondent and reckless due to his impending death, and choosing not to tell anyone about his condition, Stark appoints his personal assistant Pepper Potts CEO of Stark Industries, and hires Stark employee Natalie Rushman as his personal assistant. Stark competes in the Monaco Grand Prix, where he is attacked in the middle of the race by Vanko who wields electrified whips. Stark dons his Mark V armor and defeats Vanko, but the suit is severely damaged. Vanko explains his intention was to prove to the world that Iron Man is not invincible. Impressed by Vanko's performance, Stark's rival, Justin Hammer, fakes Vanko's death while breaking him out of prison and asks him to build a line of armored suits to upstage Stark. During what he believes is his final birthday party, Stark gets drunk while wearing the Mark IV suit. Disgusted, U.S. Air Force Lieutenant Colonel James Rhodes dons Stark's Mark II prototype armor and tries to restrain him. The fight ends in a stalemate, so Rhodes confiscates the Mark II for the US Air Force. Nick Fury, S.H.I.E.L.D.'s director, approaches Stark, revealing "Rushman" to be undercover agent Natasha Romanoff and that Howard Stark was a S.H.I.E.L.D. founder whom Fury knew personally. Fury explains that Vanko's father jointly invented the arc reactor with Stark, but when Anton tried to sell it for profit, Stark had him deported. The Soviets sent Anton to the gulag. Fury gives Stark some of his father's old material; a hidden message in the diorama of the 1974 Stark Expo proves to be a diagram of the structure of a new element. With the aid of his computer J.A.R.V.I.S., Stark synthesizes it. When he learns Vanko is still alive, he places the new element in his arc reactor and ends his palladium dependency. At the Expo, Hammer unveils Vanko's armored drones, led by Rhodes in a heavily weaponized version of the Mark II armor. Stark arrives in the Mark VI armor to warn Rhodes, but Vanko remotely takes control of both the drones and Rhodes' armor and attacks Iron Man. Hammer is arrested while Romanoff and Stark's bodyguard Happy Hogan go after Vanko at Hammer's factory. Vanko escapes, but Romanoff returns control of the Mark II armor to Rhodes. Stark and Rhodes together defeat Vanko and his drones. Vanko seemingly commits suicide by blowing up his suit. Potts resigns as CEO. At a debriefing, while news footage of a rampaging Hulk plays, Fury informs Stark that because of his difficult personality, S.H.I.E.L.D. intends to use him only as a consultant. Stark and Rhodes receive medals for their heroism. In a post-credits scene, S.H.I.E.L.D. Agent Coulson reports the discovery of a large hammer at the bottom of a crater in a desert in New Mexico.

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 the present, Odin's son Thor prepares to ascend to the throne of Asgard, but is interrupted when Frost Giants attempt to retrieve the Casket. Against Odin's order, Thor travels to Jotunheim to confront Laufey, accompanied by his brother Loki, childhood friend Sif and the Warriors Three: Volstagg, Fandral, and Hogun. A battle ensues until Odin intervenes to save the Asgardians, destroying the fragile truce between the two races. For Thor's arrogance, Odin strips his son of his godly power and exiles him to Earth as a mortal, accompanied by his hammer Mjolnir, now protected by an enchantment that allows only the worthy to wield it. Thor lands in New Mexico, where astrophysicist Dr. Jane Foster, her assistant Darcy Lewis, and mentor Dr. Erik Selvig, find him. The local populace finds Mjolnir, which S.H.I.E.L.D. agent Phil Coulson soon commandeers before forcibly acquiring Jane's data about the wormhole that delivered Thor to Earth. Thor, having discovered Mjolnir's nearby location, seeks to retrieve it from the facility that S.H.I.E.L.D. quickly constructed but he finds himself unable to lift it, and is captured. With Selvig's help, he is freed and resigns himself to exile on Earth as he develops a romance with Jane. Loki discovers that he is actually Laufey's son, adopted by Odin after the war ended. A weary Odin falls into the deep "Odinsleep" to recover his strength. Loki seizes the throne in Odin's stead and offers Laufey the chance to kill Odin and retrieve the Casket. Sif and the Warriors Three, unhappy with Loki's rule, attempt to return Thor from exile, convincing Heimdall, gatekeeper of the Bifröst—the means of traveling between worlds—to allow them passage to Earth. Aware of their plan, Loki sends the Destroyer, a seemingly indestructible automaton, to pursue them and kill Thor. The warriors find Thor, but the Destroyer attacks and defeats them, prompting Thor to offer himself instead. Struck by the Destroyer and near death, Thor's sacrifice proves him worthy to wield Mjolnir. The hammer returns to him, restoring his powers and enabling him to defeat the Destroyer. Kissing Jane goodbye and vowing to return, he and his fellow Asgardians leave to confront Loki. In Asgard, Loki betrays and kills Laufey, revealing his true plan to use Laufey's attempt on Odin's life as an excuse to destroy Jotunheim with the Bifröst Bridge, thus proving himself worthy to his adoptive father. Thor arrives and fights Loki before destroying the Bifröst Bridge to stop Loki's plan, stranding himself in Asgard. Odin awakens and prevents the brothers from falling into the abyss created in the wake of the bridge's destruction, but Loki allows himself to fall when Odin rejects his pleas for approval. Thor makes amends with Odin, admitting he is not ready to be king; while on Earth, Jane and her team search for a way to open a portal to Asgard. In a post-credits scene, Selvig has been taken to a S.H.I.E.L.D. facility, where Nick Fury opens a briefcase and asks him to study a mysterious cube-shaped object, which Fury says may hold untold power. An invisible Loki prompts Selvig to agree, and he does.

In the present day, scientists in the Arctic uncover a frozen circular object with a red, white, and blue motif in the cockpit of a derelict aircraft. In March 1942, Nazi officer Johann Schmidt and his men enter the town of Tønsberg in German-occupied Norway, to steal a mysterious device called the Tesseract,[b] which possesses untold powers. Meanwhile, in New York City, Steve Rogers is rejected for World War II military recruitment because of various health and physical problems. While attending an exhibition of future technologies with his friend Sgt. James "Bucky" Barnes, Rogers again attempts to enlist. Overhearing Rogers' conversation with Barnes about wanting to help in the war, Dr. Abraham Erskine allows Rogers to enlist. He is recruited into the Strategic Scientific Reserve as part of a "super-soldier" experiment under Erskine, Col. Chester Phillips, and British agent Peggy Carter. Phillips is unconvinced by Erskine's claims that Rogers is the right person for the procedure but relents after seeing Rogers commit an act of self-sacrificing bravery. The night before the treatment, Erskine reveals to Rogers that Schmidt underwent an imperfect version of the procedure and suffered permanent side-effects. Back in Europe, Schmidt and Dr. Arnim Zola harness the energies of the Tesseract, intending to use the power to fuel Zola's inventions, mounting an offensive that will change the world. Schmidt discovers Erskine's location and dispatches an assassin to kill him. In the U.S., Erskine subjects Rogers to the super-soldier treatment, injecting him with a special serum and dosing him with "vita-rays". After Rogers emerges from the experiment taller and more muscular, one of the attendees kills Erskine, revealing himself to be Schmidt's assassin, Heinz Kruger. Rogers pursues and captures Kruger, but the assassin avoids interrogation by committing suicide by cyanide capsule. With Erskine dead and his super-soldier formula lost, U.S. Senator Brandt has Rogers tour the nation in a colorful costume as "Captain America" to promote war bonds, rather than allow scientists to study him and attempt to rediscover the formula. In 1943, while on tour in Italy performing for active servicemen, Rogers learns that Barnes's unit was MIA in a battle against Schmidt's forces. Refusing to believe that Barnes is dead, Rogers has Carter and engineer Howard Stark fly him behind enemy lines to mount a solo rescue attempt. Rogers infiltrates the fortress of Schmidt's Hydra organization, freeing Barnes and the other prisoners. Rogers confronts Schmidt, who removes his mask, revealing a red, skull-like visage that earned him the sobriquet "the Red Skull". Schmidt escapes and Rogers returns to base with the freed soldiers. Rogers recruits Barnes, Dum Dum Dugan, Gabe Jones, Jim Morita, James Montgomery Falsworth, and Jacques Dernier to attack other known Hydra bases. Stark outfits Rogers with advanced equipment, most notably a circular shield made of vibranium, a rare, nearly indestructible metal. Rogers and his team sabotage various Hydra operations. The team later assaults a train carrying Zola. Rogers and Jones succeed in capturing Zola, but Barnes falls from the train to his assumed death.[c] Using information extracted from Zola, the final Hydra stronghold is located, and Rogers leads an attack to stop Schmidt from using weapons of mass destruction on American cities and soon other major cities across the globe. Rogers climbs aboard Schmidt's aircraft as it takes off. During the subsequent fight, the Tesseract's container is damaged. Schmidt physically handles the Tesseract, causing him to dissolve in a bright light. The Tesseract falls to the floor, burning through the plane and falling to Earth. Seeing no way to land the plane without the risk of detonating its weapons, Rogers crashes it in the Arctic. Stark later recovers the Tesseract from the ocean floor but is unable to locate Rogers or the aircraft, presuming him dead. Rogers awakens in a 1940s-style hospital room. Deducing from an anachronistic radio broadcast that something is wrong, he flees outside and finds himself in present-day Times Square, where S.H.I.E.L.D. director Nick Fury informs him he has been "asleep" for nearly 70 years. In a post-credits scene, Fury approaches Rogers, proposing a mission with worldwide ramifications.