The story begins when , the mischievous brother of Thor, arrives on Earth via a wormhole. He steals the Tesseract , a powerful energy source of unknown potential, from a S.H.I.E.L.D. research facility. Loki intends to use the cube to open a portal for an invading alien army known as the Chitauri , planning to conquer Earth and rule as its king. Assembling the Team
The team initially struggles to work together. Their clashing egos and Loki’s manipulations lead to a massive confrontation aboard the S.H.I.E.L.D. Helicarrier. After the tragic death of Agent Phil Coulson, the heroes finally find a common cause and realize they must stand together to save the world. The Battle of New York
It sounds like you're looking for the plot of the 2012 blockbuster . Here is the story breakdown: The Threat
Master assassins (though Hawkeye is initially brainwashed by Loki). Thor: The God of Thunder who arrives to stop his brother. The Conflict
A scientist with a gamma-powered temper.
In response to the global threat, S.H.I.E.L.D. Director activates the "Avengers Initiative." He brings together a group of extraordinary individuals: Tony Stark (Iron Man): The genius billionaire.
To end the threat, Iron Man intercepts a nuclear missile launched by the World Security Council and flies it through the portal, destroying the Chitauri command ship. He narrowly survives the fall back to Earth. In the end, Loki is taken back to Asgard in chains, the Tesseract is secured, and the Avengers go their separate ways—knowing they will reunite whenever the world needs them.