In the Eastern European country of Sokovia, the AvengersﾗIron Man, Captain America, Thor, Hulk, Black Widow, and Hawkeyeﾗattack a Hydra facility commanded by Baron Wolfgang von Strucker in an attempt to retrieve a scepter that was previously used by Loki, Thor’s adoptive brother. They encounter two of Strucker’s test subjects, the Maximoff twins, Quicksilver and Scarlet Witch, before they succeed in apprehending Strucker and retrieving Loki’s scepter. Scarlet Witch manipulates Iron Man’s mind, causing him to see a haunting vision of the Avengers’ defeat. She allows him to take the scepter as a flashback begins, explaining how the scepter ended up on Earth.
Loki encounters the Other, the leader of an extraterrestrial race known as the Chitauri and servant of Thanos. In exchange for retrieving the Tesseract, a powerful energy source of unknown potential, the Other promises Loki an army with which he can subjugate Earth. Nick Fury, director of the espionage agency S.H.I.E.L.D., and his lieutenant Maria Hill arrive at a remote research facility where physicist Dr. Erik Selvig is leading a research team experimenting on the Tesseract. Agent Phil Coulson explains that the object has begun radiating an unusual form of energy. The Tesseract suddenly activates and opens a wormhole, allowing Loki to reach Earth. Loki takes the Tesseract and uses his scepter to brainwash Selvig, Hawkeye, and many other agents to aid him. Maria and Agent Williams fight the brainwashed agents while Loki, Hawkeye, and Selvig escape in a stolen truck. Maria and Williams pursue them in another vehicle, fighting more brainwashed agents before the base explodes, allowing Loki to escape.