Countdown to Zero: Although the Cold War is behind us, the threat of nuclear disaster remains very real. Director Lucy Walker discusses the invention of the atomic bomb and brings the story into the present day, examining the possibility of nuclear calamity under the categories of "Madness," "Accident" and "Miscalculation." With narration by Gary Oldman, the film includes a hypothetical sequence of a nuclear explosion in New York City's Times Square, timed to coincide with the New Year's Eve countdown.