You might think that the biggest challenge in creating Halo 4's Forward Unto Dawn series was translating one of gaming's most beloved franchises into a live-action film that was not only true to the source material, but also worth watching. You'd be right, of course, but for fans the biggest challenge was in making sure Master Chief sounded right.

During the Forward Unto Dawn postmortem at GDC, 343 Industries franchise development director Frank O'Connor noted that the casting of Master Chief was "a source of much consternation" for series fans. "We did a couple of tests using the actor who plays Master Chief in the game, and he's an older guy," said O'Connor.

The ending of Forward Unto Dawn reveals that the superhuman Spartan soldiers are just as young as the film's UNSC cadets, so giving Master Chief the gravelly voice we all know and love would be out of place. "He can't sound like he's 50," said O'Connor, "and so we had to find a young actor whose voice sounded like his voice might eventually grow into the Chief's."