Iron Man 2

In Russia, the media covers Tony Stark's disclosure of his identity as Iron Man. Ivan Vanko, whose father Anton Vanko has just died, sees this and begins building a miniature arc reactor similar to Stark's. Six months later, Stark is a superstar and uses his Iron Man suit for peaceful means, resisting government pressure to sell his designs. He reinstitutes the Stark Expo to continue his father Howard's legacy.

The palladium core in the arc reactor that keeps Stark alive and powers the armor is slowly poisoning him, and he cannot find a substitute. Growing increasingly reckless and despondent about his impending death, and choosing not to tell anyone about his condition, Stark appoints his personal assistant Pepper Potts CEO of Stark Industries, and hires Stark employee Natalie Rushman to replace her as his personal assistant. Stark competes in the Monaco Historic Grand Prix, where he is attacked in the middle of the race by Vanko, who wields electrified whips. Stark dons his Mark V armor and defeats Vanko, but the suit is severely damaged. Vanko explains his intention was to prove to the world that Iron Man is not invincible. Impressed by Vanko's performance, Stark's rival, Justin Hammer, fakes Vanko's death while breaking him out of prison and asks him to build a line of armored suits to upstage Stark. During what he believes is his final birthday party, Stark gets drunk while wearing the Mark IV suit. Disgusted, U.S. Air Force Lieutenant Colonel James Rhodes dons Stark's Mark II prototype armor and tries to restrain him. The fight ends in a stalemate, so Rhodes confiscates the Mark II for the U.S. Air Force. Read more on Wikipedia.