Success is poison in this film—literal poison, seeping into Tony's bloodstream from the arc reactor keeping him alive. Six months after declaring "I am Iron Man," Tony has become America's one-man peacekeeping force, and the performance is starting to crack. He claims to have "privatized world peace," which is both a boast and an admission of how fundamentally broken that concept is.
The government wants the suit. Justin Hammer, a defense contractor who represents everything craven about military profiteering, wants to replicate it. And in Russia, Ivan Vanko—son of Anton Vanko, who worked with Howard Stark on the arc reactor before being deported for trying to sell it—watches Tony with the kind of hatred that ferments for decades.
What makes Ivan interesting is that he's right about one thing: the Stark legacy is built on taking credit for collaborative genius. His father helped create the arc reactor and died in poverty while Howard Stark became a legend. When Ivan builds his own reactor and electrified whips, attacking Tony at Monaco, he's proving that Tony's uniqueness is a myth maintained by wealth and timing.
The palladium poisoning accelerates Tony's self-destruction. He appoints Pepper as CEO and throws a birthday party where he gets drunk in the Iron Man suit, nearly killing Rhodey. It's the behavior of someone who thinks he's already dead. Rhodey takes a suit to the military, and Hammer weaponizes it into War Machine—another reminder that technology without ethics just becomes better tools for violence.
Nick Fury reveals that Tony's new assistant "Natalie" is actually Natasha Romanoff, a S.H.I.E.L.D. agent, and gives Tony his father's research materials. In those old film reels, Tony finds something unexpected: Howard telling him he's his greatest creation, that the key to the future is hidden in something he couldn't build with his era's technology. It's the closest thing to a blessing Tony will ever get from his father.
Tony synthesizes a new element while Ivan completes the Hammer Drones and secretly modifies War Machine. The Stark Expo battle forces Tony and Rhodey to fight side by side against an army of automated suits controlled by someone who understands that legacy is just another word for inherited sins.
Fury tells Tony he's unsuitable for the Avengers Initiative but wants him as a consultant—a perfect summary of Tony's value and his liability. In New Mexico, a hammer sits in a crater, waiting.