Phase One, also known as Avengers Assembled, is the first part of the Marvel Cinematic Universe and the first part of The Infinity Saga.
Tony Stark, a billionaire industrialist and genius inventor, is kidnapped and forced to build a devastating weapon. Instead, using his intelligence and ingenuity, Tony builds a high-tech suit of armor and escapes captivity. When he uncovers a nefarious plot with global implications, he dons his powerful armor and vows to protect the world as Iron Man.
Scientist Bruce Banner lives in the shadows, cut off from the woman he loves and scouring the planet for an antidote to the unbridled force of rage within him. When the military masterminds who dream of exploiting his powers force him back to civilization, he finds himself face-to-face with his most formidable foe: the Abomination—a nightmarish beast of pure aggression whose powers match the Hulk's own.
With the world now aware that he is Iron Man, billionaire inventor Tony Stark faces pressure from all sides to share his technology with the military. He is reluctant to divulge the secrets of his armored suit, fearing the information will fall into the wrong hands. With Pepper Potts and "Rhodey" Rhodes by his side, Tony must forge new alliances and confront a powerful new enemy, all the while realizing that not only is there a madman out to destroy him, but the very technology designed to save his life is slowly killing him.
This epic adventure spans the Marvel universe from present-day Earth to the cosmic realm of Asgard. At the center of the story is The Mighty Thor, a powerful but arrogant warrior whose reckless actions reignite an ancient war. As a result, Thor's father Odin banishes his son to Earth where he is forced to live among humans. From Earth, Thor must make preparations to stop his evil brother Loki from dethroning Odin, seizing power and imposing his villainous rule on all of Asgard. When the darkest forces are sent to invade Earth, Thor learns what it takes to be a true hero.
After the events of The Incredible Hulk, S.H.I.E.L.D. agent Phil Coulson has some bad news for agent Jasper Sitwell: The World Security Council wants Emil Blonsky to join the Avengers Initiative, and Coulson has orders to obtain his release from General Thaddeus Ross. Unable to defy the Council's request, Coulson and Sitwell hatch a plan to sabotage it – with a very special secret weapon.
Before the events of Thor, S.H.I.E.L.D. agent Phil Coulson stops for gas on his way to New Mexico. As he browses the convenience store for snacks, two armed robbers burst in, ordering the night clerk to hand over the cash and Coulson to toss them his car keys. But, as the robbers are about to discover, there may be more to this mild-mannered suit than meets the eye.
After being deemed unfit for military service, Steve Rogers volunteers for a top secret research project that turns him into Captain America, a superhero dedicated to defending America's ideals. Captain America leads the fight for freedom as the ultimate weapon against evil. When a terrifying force threatens everyone across the globe, the world's greatest soldier wages war on the evil HYDRA organization, led by the villainous Red Skull.
Nick Fury, Director of the international peacekeeping agency known as S.H.I.E.L.D., finds himself in need of a team to pull the world back from the brink of disaster. The Avengers — Iron Man, The Incredible Hulk, Thor and Captain America — assemble alongside Black Widow and Hawkeye to battle an unexpected enemy: the Asgardian God Loki, who commands a powerful Chitauri army threatening global safety and security.
Following the epic Battle of New York, S.H.I.E.L.D. recovered all but one piece of the alien technology left behind in the city...a Chitauri blaster, aka "Item 47." After a young couple stumble upon the elusive weapon, they embark on a bank-robbing spree - with S.H.I.E.L.D. agents hot on their trail.