"I think Superman's a loner. Without a doubt. I think he recognizes that he has this responsibility, because of the power that he has, and that he has to bear it by himself. And to make sure that he is using it for good and not for evil. He has to keep in check his human emotions, though he's not really a human – because those are the things about living on Earth that can get us in trouble. Greed, power, love -- all those things that take us off the tracks."