Robert Downey Jr. as Tony Stark / Iron Man:
A self-described genius, billionaire, playboy, and philanthropist with an electromechanical suit of armor of his own invention. Downey was cast as part of his four-picture deal with Marvel Studios, which includes Iron Man 2 and The Avengers.[6] Downey said that he initially pushed Whedon to make Stark the lead: "Well, I said, 'I need to be in the opening sequence. I don't know what you're thinking, but Tony needs to drive this thing.' He was like, 'Okay, let's try that.' We tried it and it didn't work, because this is a different sort of thing, the story and the idea and the theme is the theme, and everybody is just an arm of the octopus."[7] About the character's evolution from previous films, Downey said, "In Iron Man, which was an origin story, he was his own epiphany and redemption of sorts. Iron Man 2 is all about not being an island, dealing with legacy issues and making space for others. . . In The Avengers, he's throwing it down with the others".[8]