"I didn't know it wasn't a mutually binding contract; it was only beneficial for them and they could bring me back or not. They can honor it or not. And you know they made a great deal, Don (Cheadle) and Robert (Downey Jr.) they get along well. But the best thing that happened as a result of it, I went back to school and finished and got my doctorate in chemical engineering. And now I have a company where we grow diamonds. That's going to replace the silicon in computers; that's going to replace all gemstones. So, if that hadn't happened, I would never have gone back [to school].”

Casting is a tricky process, even more so when you're talking multiple-picture deals for an aspiring franchise. When superhero movies began booming again, Terrence Howard seemed poised to stick with themovies, having deftly played Tony Stark's oft-conflicted, ever-stern friend Rhodey in the first film. But when casting news came out on, we were shocked to learn Howard had been ousted in favor or Don Cheadle. (Who we love, so it was a confusing time!)And we weren't alone. At the time, Howard described the move as "the surprise of a lifetime," revealing he'd heard about the change-up through the press, not a call from Marvel Entertainment. Ouch. You'd think after that he'd have an axe to grind, but while promoting his new movie Dead Man Down on the radio show(via Total Film ), he was pretty forthcoming and surprisingly not bitter.Howard claims Cheadle was always the studio's first choice, so when it came time to cast, they basically offered Howard a deal he could refuse. Paid $4.5 million for the first film, his contract suggested he'd get $8 for a sequel. However, he explains, “The second time, [the studio] said, 'We think the movie will be successful with or without you. So, instead of the $8m that we said we were gonna' pay you, we're going to let you come back for a million dollars.'"Having signed a three-picture deal, Howard thought he was guaranteed a part in the next twomovies, but he admits: