Rebecca Hall has described Robert Downey Jr as 'a force'.
Hall is one of the new faces on the cast list of Iron Man 3, a film that sees Robert Downey Jr reprise the title role.
This is the first time that the pair have worked together and Hall admits that she found him very 'inspiring'.
Speaking to MTV News the actress said: "He's a really brilliant improvisationalist. He's incredibly quick-witted. Everything he brings to Tony Stark is him.
"Of course there's all of the tradition from the comic books, the movie, and also the writing is brilliant, but there's also a heavy dose of that character is Robert Downey Jr. "
"He's inspiring to work with and watch. He's a force."
With this third Iron Man film Shane Black is in the director's chair for the first time while there are some other new faces to watch out for.
Guy Pearce, Ben Kingsley and James Badge Dale have all joined the cast list alongside Hall while Gwyneth Paltrow and Don Cheadle are also back.
Closed Circuit is another movie project of Hall's that is going to be released in 2013 as she teams up with Eric Bana and Jim Broadbent.
Iron Man 3 is released 26th April.
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