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Sam Rockwell said there’s some pressure coming into a high-profile project such as "Iron Man 2” but added that director Jon Favreau made the process actor-friendly. The actor, receiving great buzz for his role in the sci-fi film "Moon,” attended the "Iron Man 2” presentation in Hall H of the San Diego Convention Center at Comic-Con International and talked to reporters following the panel.

In "Moon,” Rockwell plays Sam Bell, an astronaut nearing the end of his three-year stint on a lunar mining base. This lunar mining has helped to end the earth’s energy crisis. But when Sam makes an unusual discovery after a mining accident, his entire world view is thrown into chaos.

"It’s a small movie that I thought was going to disappear after a week or two, and it’s still around, so I’m really excited about it,” Rockwell said.

On the other hand, "Iron Man 2” is anything but a small film, coming after the breakout hit "Iron Man.” Rockwell admitted there was some pressure to stepping into the sequel.

"It’s definitely nerve-wracking; the first one was such a big success,” he said "But you find a home and realize there’s a reason you’re there.”

Rockwell plays Justin Hammer, a rival arms dealer to Tony Stark, aka Iron Man, in "Iron Man 2.”

"He’s kind of a Tony Stark wannabe,” Rockwell said. "I’m going to do whatever it takes to take Tony down.”

Rockwell said most of his scenes are with Mickey Rourke’s Ivan Vanko, who becomes the Whiplash character.

"I’m sort of a patron of evil,” Rockwell said. "Mickey is the main adversary. I come to his aid.”

The comic-book Hammer is an older British man. So, Rockwell took some liberties from that version of the character.

"I looked at the comics, but they wanted me to create something a little different,” Rockwell said. He also said he decided against playing the character with an accent due to the amount of improvisation "Iron Man 2” required.

Meanwhile, the fan and critic accolades keep coming in for "Moon.”

Rockwell, a self-described sci-fi fan, was asked about his Oscar chances for the film.

"It’s very flattering,” he said. "From their lips to God’s ears. It’s very early in the year for that sort of thing.”