The Immortals star told Details that Zack Snyder's new incarnation of DC Comics's flagship superhero won't be based in reality.
"We see so much on the news that's gruesome, to put Superman in the realm of fantasy, people won't buy it," he said. "And you want people to believe the story you're selling."
"People in the past have criticised the character for being a bit chocolate-box, a bit vanilla, and this is not that - at all.
"The lore is there that we're drawing from, but to create something from that which is reflective of life today - that's the trick."
"If you only look at the American market, you're narrowing down your options an awful lot. The point of acting is to pretend you're someone else and sell a story.
"Chris Hemsworth is an Australian man, not a god from Asgaard. It would be even more fluke-y if every person who was playing a superhero was American."
A new trailer for Man of Steel will screen before The Hobbit: An Unexpected Journey next month. The film will open in cinemas in summer 2013.
Watch the Man of Steel teaser trailer below: