Iron Man 3 actress Rebecca Hall has admitted that she found being offered a role in the Marvel action franchise "intimidating."

The 30-year-old star, who plays the part of botanist Dr. Maya Hansen in the forthcoming action adventure, compared her first day on set to starting school all over again.

Speaking to Stella magazine, Rebecca said: ''Obviously it would be transparently disingenuous to say that it wasn't intimidating. They've made two of them already, everybody knows everyone.

''It's a pretty scary moment to walk into that set and go, 'Hello, I'm the new kid on the block, please be nice to me'.''

Iron Man 3 hits cinemas on April 25.