Iron Man 3 (2013)

Sometime after the events of The Avengers, a haunted Tony Stark has obsessively built several Iron Man suits in his mansion. This causes friction with his girlfriend, new Stark Industries chief Pepper Potts. In a flashback to New Year's Eve 1999, Stark, with his scientist paramour Maya Hansen, arrogantly avoids crippled scientist Aldrich Killian, who wants Stark's backing in his endeavor Advanced Idea Mechanics (AIM).
In present-day America, a string of bombings by terrorist the Mandarin has left intelligence agencies bewildered at the lack of forensic evidence. When Stark Industries security chief Happy Hogan is caught in one such attack, Stark overcomes his stupor and issues a televised threat to the Mandarin, who responds by destroying Stark's home with helicopter gunships. Potts and Hansen, who had come to warn Stark, survive the attack. Stark is flown to rural Tennessee by his artificial intelligence JARVIS, following a flight plan from his investigation into the Mandarin. Stark's experimental armor lacks sufficient power to return to California, and the world believes him dead.
Teaming with Harley, a precocious 10-year-old boy, Stark investigates the remains of a local explosion bearing the hallmarks of a Mandarin attack. He discovers the explosions were triggered by soldiers from the Extremis program, an experimental treatment intended to allow its users to recover from crippling injuries. However, if a user's body cannot properly metabolize Extremis, the user heats up and explodes. After veterans started growing unstable and exploding, their deaths were used to cover up Extremis' flaws by manufacturing a terrorist plot. Stark witnesses Extremis firsthand when Mandarin agents Ellen Brandt and Eric Savin attack him.
With Harley's help, Stark traces the Mandarin to Miami. Stark infiltrates the headquarters using a variety of home-made weapons. Inside he discovers the Mandarin is actually a British actor named Trevor Slattery, who is oblivious to the acts the Mandarin has carried out. The Mandarin is a creation of Killian, who appropriated Maya's Extremis research as a cure for his own disability and expanded the program to include injured war veterans. Killian reveals he is the true Mandarin and has kidnapped Potts and subjected her to Extremis, intending to infuse her with superhuman abilities and turn her against Stark as leverage to gain Stark's aid in fixing Extremis's flaws.
Killian has also manipulated American intelligence agencies regarding the Mandarin's location, luring James Rhodes — the former War Machine, now rebranded as the Iron Patriot — into a trap to steal the armor. Stark escapes his captivity and reunites with James, discovering that Killian intends to attack President Ellis aboard Air Force One. Remotely controlling his Iron Man armor, Stark saves the surviving passengers and crew but cannot stop Killian from abducting Ellis. They trace Killian to an impounded oil drilling platform where Killian intends to kill Ellis on live television. The vice president will become a puppet leader, following Killian's orders in exchange for Extremis to cure a little girl's disability.
On the platform, Stark goes to save Potts, and James saves the President. Stark summons each of his Iron Man suits, controlled remotely by JARVIS, to provide air support. James secures the President and leads him to safety, while Stark discovers Potts has survived the Extremis procedure. However, before he can save her, a rig collapses around them and she falls to her apparent death. Stark is forced into confronting Killian and traps him in an Iron Man suit that self-destructs, but fails to kill him. Potts, whose Extremis powers allowed her to survive her fall, intervenes and finishes Killian once and for all.
After the battle, Stark orders JARVIS to destroy each Iron Man suit remotely, as a sign of his intention to devote more time to Potts. The Vice President and Slattery are arrested. Potts undergoes surgery to remove Extremis, and Stark to remove the shrapnel embedded near his heart. He pitches his obsolete chest arc reactor into the sea, musing he will always be Iron Man, even without his armor.
In a post-credits scene, it is revealed Stark has been recounting his experiences to Dr. Bruce Banner, who awakens, having fallen asleep at the beginning of Stark's story.

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