SAN DIEGO — War Machine will be sporting that cool Iron Patriot-styled armor at some point during "Iron Man 3." At San Diego Comic-Con, Don Cheadle spoke exclusively with MTV News about the evolving dynamic between Tony Stark (Robert Downey Jr.) and Jim "Rhodey" Rhodes in the still-in-production sequel.

"What's a lot of fun in this one is that the character gets a little bit more opened up. There's a little bit more to do with Robert, and that relationship gets a little deepened," said Cheadle, who took over the role in the last movie. "They've kind of had to come to some sort of agreement. At the end of 'Iron Man 2,' [Rhodey] says, 'I need a suit.' And he just takes it. So you've got now a private sector Iron Man and a military Iron Man. There's suit envy, which is fun. 'Who's really the big dog?' We just get to play with that more. Robert and I always have a lot of fun when we're acting together."

Cheadle earned an Academy Award nomination for his role in "Hotel Rwanda" and last year produced and starred in the small but well-reviewed indie film "The Guard." Nevertheless, he has a blast making big-budget blockbusters. He promised that "Iron Man 3," which features Ben Kingsley as classic Iron Man nemesis the Mandarin, has "a lot of action."

"It's fun to get to do these big franchises and do these movies like this that are very unique in their own way," he said. "It's a lot of moving parts, a lot to sort of get your head around. It's a big challenge actually to try to keep the reality while you're doing these movies with such huge set pieces. But it's a lot of fun. The company makes it a lot easier."

Co-starring Guy Pearce, Gwenyth Paltrow and Jon Favreau (who relinquished director duties to Shane Black), "Iron Man 3" is due in theaters May 3, 2013. "Iron Man 2" collected $128.1 million during its opening weekend in May 2010.

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