Kiss Kiss Bang Bang director Shane Black's sequel will see Tony Stark (Robert Downey Jr) seeking revenge on those who destroyed his private world, and facing his most powerful enemy yet in Ben Kingsley's Mandarin.
"[Shane] has got a really wonderful understanding of pulp," Hall told IGN. "Of kind of that mainstream commercial movie, and also he has a great wit and intelligence, which adds a lot of spice to whatever he does.
"And it's sort of black… not to use an unfortunate [pun]!"
Despite the darker tone hinted at by the synopsis and teaser trailer, producer Kevin Feige has insisted that Iron Man 3 "is not a serious movie".
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Iron Man 3 is released on April 26 in the UK, and May 3 in the US.
Watch the teaser trailer below: