Michael Shannon as General Zod in "Man of Steel"
Michael Shannon as General Zod in "Man of Steel"

Cavill echoed the idea of inserting emotional Kryptonite: "The people who aren't diehard Superman fans still need to associate with the character and that needs to have some realism in today's world, certainly in the sense of a science as opposed to [only] mythology attached to it as well."

One of the first tasks was figuring out the sci-fi alien culture of Krypton with production designer Alex McDowell (who collaborated with Snyder on "Watchmen"). They created a much more ritualistically formalized and socially stratified society than our own. They likened Krypton to feudal Japan with caste systems, guilds, gods, and temples alongside a utilitarian physics based on bio-mechanics. "So we decided that on Krypton, aside from the fact that it's got different gravity, it's got a different atmosphere than we do," Goyer continued. "It's a mega gravity planet, so gravity there is anywhere from four to 10 times the gravity on Earth."

They even hired a specialist to create a spoken Kryptonian language while the art department constructed the various glyphs that appear throughout, most noticeably the famous "S" on Superman's chest, which stands for hope. We additionally visited the Kent farm in nearby Naperville, where, hidden in the barn, stands Kal's spiral-shaped space ship also bearing the symbol from the house of El.

"All these things come into play and they also explain why Superman has the powers that he has," Goyer offered. "I mean, the costume has a utility and we're going to explain where the costume comes from and why and he doesn't just fly into the crystal thing and come out with a costume.We also decided that they had been civilized for 100,000 years. They'd also become a decadent society, and may have become space faring."

Despite all the CG destruction witnessed in the trailers, "Man of Steel" is the most realistic and practical movie that Snyder's ever made. It's part of the organic strategy that defines the look and tone, including the frequent use of hand-held camera work  For Goyer, it added an immediacy and there was no better example than the second day of shooting on the Kent farm. It was magic hour and cinematographer Amir Mokri ("Transformers: Dark of the Moon") captured a revelatory moment between father and son right out of "Days of Heaven" or "Superman" in its textural beauty. "I just turned to Zack and said, 'Can you believe we're doing this?'"

As for Michael Shannon's villainous Zod, who comes to retrieve Kal, Snyder suggested he's more grounded as well. "He's not maniacal or fucked up -- he's got a point of view that's not crazy. He's a force of nature. Whatever the stakes are, you have to figure that Shannon will raise them by just being Shannon. We didn't want to start with a Superman that didn't have an enemy that showed why he needs to be Superman. Zod is Kryptonian as well."

And that's the key: connecting the dots between Krypton and Earth so this man of steel can decide which set of moral rules he's going to abide by.

Check out the "Battle for Smallville" featurette below, and the Wall Street Journal's look at the "Superhuman Appeal of Superman" here.