Even in our business, as is the world, we are in the age of specialisation. You see a lot of names of producers on a movie. If you have the idea, if you oversee the development, if you oversee the production, if you help package the movie, you sell the movie - you can be a producer. There's not a lot of us who do the whole gamut.

I think that Superman is the pinnacle of the DC Universe. Our feeling always was that you need to get Superman right. That was also our goal. We didn't want to ignore that this universe exists.

There is an expectation with a superhero film that there is spectacle and action but there also has to be heart. Striking that balance is really important.

I came from advertising. For me it's about protecting the director's vision. That's always the goal. There's keeping things on budget and on time and dealing with selling the movie so that to me is a focus. But also it's about serving the script. We are genre filmmakers, those are the films we love to make, so my perspective is a little different.

I'd been a Superman fan since the time I was a little kid. We had great respect for the Donner movie, and Superman II with Terence Stamp as Zod but I felt it was time to bring the character into the 21st century.

The story of Kal-El is actually a great story about adoption. He is an alien who has embraced his human side. As much as he loves and honours his heritage, and he needed to know where he came from and discover who he was, he has to decide who he is going to be.

At least you used to know 'there's the villain, there's the good guy', but today there are more shades of grey.