Cameron adds, "We ultimately ended up doing a screen test that convinced them utterly that he was the guy. But I had lobbied for him very strongly from the beginning. I just thought he had something that I hadn't seen before in a guy of that age. The voice, the demeanour. It was a pretty big leap - there's a big price tag hanging from this movie and to put it all on the shoulder of this guy who was relatively unknown... The studio was nervous about that, but then to their credit they (eventually) saw what I saw."