Iron Man 3

Tony Stark attends a New Year's Eve party in 1999, where he meets scientist Maya Hansen, who has developed a groundbreaking treatment called Extremis. This event also marks the first encounter between Stark and Yinsen, setting the stage for future developments in Stark's life.

During the party, a disabled scientist named Aldrich Killian invites Stark to join his company, Advanced Idea Mechanics (AIM). Stark arrogantly dismisses Killian, leaving him alone on the rooftop, which plants the seeds for Killian's future resentment towards Stark.

Years later, Maya Hansen faces a significant setback with her Extremis treatment as it begins to show dangerous flaws, resulting in violent explosions among treated subjects. This failure not only impacts her career but also sets the foundation for chaos in the future.

In the present day, Tony Stark struggles with panic attacks stemming from his experiences during the New York alien invasion. In an effort to cope with his trauma, he creates multiple Iron Man suits, which strains his relationship with girlfriend Pepper Potts.

A series of bombings attributed to a mysterious terrorist known as the Mandarin leaves law enforcement puzzled, as they cannot trace any bomb fragments back to the crime scenes. This wave of terror adds to the growing chaos in Stark's life and puts pressure on the authorities.

Aldrich Killian reaches out to Pepper Potts, showcasing his Extremis technology and attempting to recruit her for his plans. Despite their past connection and Killian's charm, Potts remains wary and declines his overtures, recognizing the potential dangers of the technology.

When Stark's security chief, Happy Hogan, is gravely injured in a bomb attack linked to the Mandarin, Stark's frustrations boil over. In a bid for justice, Stark publicly threatens the Mandarin, igniting a revenge-fueled response from the elusive terrorist.

In retaliation for Stark's threat, the Mandarin orchestrates a devastating attack that obliterates Stark's home. This catastrophic event leaves Stark vulnerable and shifts the balance of power, forcing him to reassess his situation and seek the truth.

Stark follows the trail of explosions to Rose Hill, Tennessee, where he teams up with a resourceful ten-year-old named Harley. Together, they investigate the local incident, hoping to uncover clues related to the Mandarin's operations and the motive behind the attacks.

Through their investigation, Stark discovers that the bombings are linked to veterans suffering from Extremis, which causes catastrophic explosive reactions. This revelation highlights the failures of the technology and the dangerous implications it holds for society.

In a shocking twist, Stark infiltrates the Mandarin's lair only to find Trevor Slattery, an actor hired to play the terrorist role. As the real mastermind, Killian reveals his intentions to kidnap Potts and use her as leverage, complicating Stark's mission further.

The stakes escalate when Killian launches an attack on President Ellis aboard Air Force One, putting numerous lives at risk. Stark swiftly assembles his Iron Man suits and embarks on a daring rescue mission to save the President and counter Killian's deadly plan.

In the climax of the film, Stark battles Killian while working alongside Potts, who has survived her enhancements from Extremis. Together, they confront Killian, neutralizing the threat he poses to both Stark and the nation.

In the aftermath of the conflict, Stark decides to destroy his remaining Iron Man suits as a commitment to his relationship with Potts. He reflects on his identity and tosses away the arc reactor that has symbolized his life as Iron Man.

The story concludes with Stark awakening Dr. Bruce Banner, signaling the potential for future adventures. This whimsical twist returns to the beginning of Stark’s journey, highlighting his growth and acceptance of his dual identity.