Downey Jr., not yet a global superstar, was fond of visiting the modest Marvel offices to see how the production was progressing. “There was no script, and we were basically writing the movie on the wall,” says Stephen Platt. (The screenwriters had generated reams of pages, but nothing had been nailed down.) “There’s no action beats, there’s nothing. It’s literally like ‘Iron Man fights an army.’ ” As the art team showed off their work, Platt said, Downey eagerly posed in fight stances, playing out potential scenarios in front of the sketches taped to the wall. “He was just like a little kid
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