Robert Downey Jr. gives a glimpse at Iron Man 2

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Dec 14, 2012, 3:54 PM EST

Robert Downey Jr., who reprises the role of Tony Stark/Iron Man in Iron Man 2, offered a few details about the sequel, which is now shooting in Los Angeles.

"I've never been in a sequel, and it's very daunting, because I feel the expectation of the millions of people who watched it and enjoyed it and told me that it was a little different than your usual genre picture and that they expected us to not screw it up," Downey told the site over the weekend. "So I actually have taken Iron Man 2 probably more seriously than any movie I've ever done, which is appropriately ridiculous for Hollywood."

Downey co-stars with Gwyneth Paltrow, Scarlett Johansson, Mickey Rourke and Don Cheadle in the sequel, which will be directed by Jon Favreau.

"The set pieces have to do with things that aren't your typical, like, bad-guy conflict," Downey said. "The relationships are very complex and hilarious. The motivations Tony has, and why he turns around and does things, has completely to do with his own internal processes, and it really is, I think, as much as we tried to in the first one really see behind the fa├žade of this kind of storytelling. We really, I think, leaving ourselves open to ... We're kind of trying to tell a story about how a dysfunctional family saves life on Earth as we know it."

Downey also promised the movie would have a presence at Comic-Con International in San Diego in July. Iron Man 2 is slated for release on May 7, 2010.