In *The Avengers* (2012), Loki steals the Tesseract from a secret S.H.I.E.L.D. facility and opens a wormhole over Manhattan to let a Chitauri army invade Earth, and six mismatched heroes — Iron Man, Captain America, Thor, Hulk, Black Widow and Hawkeye — stop him by closing the portal with a nuclear missile Iron Man carries through it.
The ending means the team that spent most of the film arguing becomes a standing institution: Loki is taken back to Asgard in chains, S.H.I.E.L.D.'s secret weapons program is exposed as a motive the heroes reject, and a mid-credits scene reveals that Loki's unseen backer is Thanos. Written and directed by Joss Whedon, the film was the first crossover event of the Marvel Cinematic Universe, pulling characters from five earlier films into one story. If you want the plot in order, the logic of the ending, and what each closing beat sets up, that is what follows.
Table of Contents
- The plot in order: from the Tesseract theft to the Battle of New York
- Why the ending works: the nuke, the portal and the "we have a Hulk" logic
- What each character actually wants
- The two post-credits scenes, explained
- What you need to have seen first, and what the film does not explain
- Frequently Asked Questions
The plot in order: from the Tesseract theft to the Battle of New York
The film opens at a remote S.H.I.E.L.D. research base where scientists are studying the Tesseract, the glowing cube of cosmic energy introduced in *Captain America: The First Avenger*. Loki, Thor's adopted brother, arrives through the cube's own energy, kills security staff, takes the Tesseract and uses his scepter to put Hawkeye (Clint Barton) and physicist Erik Selvig under mind control. S.H.I.E.L.D. director Nick Fury evacuates as the base collapses. Fury responds by reactivating the shelved "Avengers Initiative." Black Widow (Natasha Romanoff) recruits Bruce Banner to track the Tesseract's gamma signature; Agent Coulson brings in Tony Stark; Steve Rogers, recently thawed after seventy years in ice, joins out of duty. They capture Loki in Stuttgart, where Thor intercepts the transport jet and fights Iron Man in a forest before Captain America breaks it up.
Aboard S.H.I.E.L.D.'s flying aircraft carrier, the Helicarrier, the group turns on itself. Loki, held in a cell designed for the Hulk, needles each of them while Stark and Banner discover that S.H.I.E.L.D. intended to use the Tesseract to build weapons. Hawkeye's team attacks; the argument becomes a brawl, Banner transforms, Thor is ejected in Loki's cell, Hawkeye's bomb disables an engine, and Coulson is killed trying to stop Loki with an experimental gun. Loki reaches Stark Tower in Manhattan, where Selvig has built a device that turns the Tesseract into a stable wormhole. Chitauri infantry and flying craft pour through. The reassembled team fights them street by street until Black Widow uses Loki's scepter to shut the portal, with one adjustment: Iron Man first flies a nuclear missile through it into the Chitauri fleet.
Why the ending works: the nuke, the portal and the "we have a Hulk" logic
The World Security Council, S.H.I.E.L.D.'s oversight body, decides Manhattan is lost and orders a nuclear strike on the island. Fury tries to stop the launch and fails. Iron Man catches the missile in mid-air and carries it up through the wormhole, where it detonates against the Chitauri mothership. The invaders drop dead mid-stride because they were a networked force dependent on that ship. That is the plot mechanism, but the ending's real argument is about who gets to make the call. The Council's answer to an alien army was to sacrifice a city.
The team's answer was to redirect the same weapon at the actual enemy and keep the city. Stark's self-sacrifice — he expects not to come back, and his suit loses power on the way down — closes the arc that began with him refusing to lay down on the wire during the Helicarrier argument. Hulk's role in the finale works the same way. Through the first two acts Banner's transformation is treated purely as a liability to be contained. In the battle, Hulk fights alongside the team instead of against it, smashes a Leviathan and catches the falling Stark. The line Fury uses earlier about having a Hulk stops being a boast and becomes literal: the thing S.H.I.E.L.D. tried to cage is what survives the fall.
What each character actually wants
Loki's stated goal is to rule Earth, and his private goal is to beat Thor at something. He tells Black Widow that his scepter's hold on Hawkeye is "all expression" — and she turns his own taunting back on him to learn that his plan depends on unleashing the Hulk. The plan collapses in a single shot when Hulk slams him through the floor of Stark Tower, mid-speech, and he gives up. Fury wants a deterrent and is willing to lie to get one.
He suppresses the weapons program, keeps Coulson's death cards as leverage, and admits to the Council that he put his faith in people rather than in the arsenal they wanted. Captain America's objection is not strategic but moral: he finds the Tesseract weapon prototypes himself and confronts Fury with one on the table. Black Widow and Hawkeye carry the film's quietest thread. Her entire motivation for the mission is that he is compromised, and the "unmaking" of his conditioning — she hits him in the head — is the closest the film comes to a personal rescue. Thor's problem is family: he wants Loki taken home, not killed, and the ending gives him exactly that.
The two post-credits scenes, explained
The mid-credits scene shows the Chitauri's superior reporting the defeat to a shadowed figure who turns, smiles and is identified in the credits as Thanos. This is the payoff for the opening, where Loki is handed the scepter and told that Earth will be his if he delivers the Tesseract. It establishes that Loki was a middleman, not the author of the invasion, and it begins the Infinity Stone storyline that runs through the rest of the MCU's first three phases. The second scene, after the full credits, has no dialogue: the exhausted team eats shawarma in a wrecked restaurant.
It answers the film's central question without a line — they are still sitting together after the fight is over. A third closing beat matters more than it looks. Thor and Loki leave Earth using the Tesseract, so both the cube and the scepter end the film off Earth or in S.H.I.E.L.D. custody. Where those objects go next drives *Captain America: The Winter Soldier* and *Avengers: Age of Ultron*.
What you need to have seen first, and what the film does not explain
Two things the film deliberately leaves open. It never explains the Chitauri's origin or why Thanos wants the Tesseract specifically — that waits years.
And it does not resolve Banner's control over the Hulk; he says he came to in Calcutta and that the Hulk's cooperation at the end is unexplained even to him. One continuity note worth flagging for viewers who continue: Coulson's death is presented as final here, and the "cellist in Portland" and bloodstained trading cards are written as closure. His later return is a decision made outside this film, not a twist planted inside it.
- The Avengers* assumes you know five earlier films, but it works with far less. The minimum useful background:
- *Captain America: The First Avenger* — the Tesseract and why Rogers is seventy years out of date.
- *Thor* — Loki's grievance and Selvig's connection to Jane Foster's research.
- *Iron Man* and *Iron Man 2* — Stark's arc reactor, Stark Tower and his standing conflict with S.H.I.E.L.D.
- *The Incredible Hulk* — optional; Banner is recast here and the film reintroduces him from scratch.
Frequently Asked Questions
Why did closing the portal kill the Chitauri?
The nuclear detonation destroyed their mothership first. The army operated as a linked force dependent on that ship, so the soldiers and Leviathans in Manhattan collapsed the moment it was gone.
How does Iron Man survive the fall?
His suit loses power above the city and he falls unconscious through the closing portal. Hulk catches him and the impact and a roar revive him.
Was Loki in control of his own plan?
Only partly. The opening and the mid-credits scene establish that he was given the scepter and the Chitauri army by Thanos's forces in exchange for delivering the Tesseract.
Does the film need to be watched before *Avengers: Age of Ultron*?
Yes. Stark's experience of the wormhole, the scepter's custody and the team's formation are all direct setup for that film.