Reviews provided by RottenTomatoes
Roger Moore, Orlando Sentinel: Like the ongoing threat itself, Countdown is simply numbing. Read more
Jeannette Catsoulis, New York Times: This scarily convincing argument that the end, if not quite nigh, is at least foreseeable urges us to wake up and smell the highly enriched uranium. Read more
John Anderson, Wall Street Journal: The nighttime photography, of the world's most luminous cities, awakens our sense of grief -- not for what's gone, but for what could be, in the blink of an eye. The editing by Brad Fuller and Brian Johnson is miraculous. Read more
Moira MacDonald, Seattle Times: Smart, swift and scary as hell. Read more
Jonathan F. Richards, Film.com: Countdown to Zero may not be the most fun you'll have in the movies this year, but it is absolutely mandatory viewing. Read more
Noel Murray, AV Club: Walker has something important to say with Countdown To Zero, but if this movie were standing on a doorstep with a petition, most reasonable people would sign it quickly and send it on its way, rather than inviting it in to chat. Read more
Wesley Morris, Boston Globe: World destruction is no laughing matter, and yet this movie's treatment of it is sometimes amusingly desperate. Read more
Michael Phillips, Chicago Tribune: Some of the footage is astounding. Read more
Peter Rainer, Christian Science Monitor: Made-up horror movies have nothing on Countdown to Zero. Read more
Lisa Kennedy, Denver Post: The news is ugly. The film is often gorgeous and wields a cumulative power to humanize potential devastation. Read more
Tom Long, Detroit News: Easily the scariest movie of the year. Read more
Owen Gleiberman, Entertainment Weekly: Countdown to Zero comes close to being nuclear-anxiety porn, yet it's the rare film that could trigger and unite the reflexes 
 of the left and the right. It makes 
 getting rid of nukes seem less like a ''cause'' than an imperative. Read more
David Germain, Associated Press: Offers a chilling look at current nuclear arsenals and the weapons programs of North Korea and Iran. Read more
Kenneth Turan, Los Angeles Times: Walker adroitly mixes extensive newsreel footage, lively graphics and talking-head interviews with dozens of people, from scientists to think tank folks to world leaders... Read more
Rene Rodriguez, Miami Herald: Read more
Kyle Smith, New York Post: Illustrating the many ways nuclear weapons could kill you makes Countdown to Zero one of the most frightening documentaries you'll ever see, or endure. Read more
Carrie Rickey, Philadelphia Inquirer: [A] well-researched, anxiety-provoking film... Read more
James Berardinelli, ReelViews: Countdown to Zero is worthwhile to an extent, if that extent is largely to remind the viewer of certain facts that are easily shunted to the back of one's consciousness. Read more
Colin Covert, Minneapolis Star Tribune: This handsomely produced film argues that nukes can be eliminated through enforceable international agreements, just as chemical and biological weapons have been banned. Read more
Stephen Cole, Globe and Mail: A bluntly effective media campaign as opposed to a well-articulated documentary. Read more
Geoff Pevere, Toronto Star: At least it makes you scared again. There's nothing more frightening than what we've learned to live with. Read more
Dave Calhoun, Time Out: Comes loaded with a relatively big budget and a line-up of talking heads more powerful than a meeting of the Bilderberg Group. Read more
Joshua Rothkopf, Time Out: For those of us who remember having to endure The Day After in social-studies class, followed by cheery discussions of nuclear winter, Countdown to Zero will cast a frightening, punishing spell. Read more
John Anderson, Variety: A politically urgent picture, it will also literally scare the breath out of what will certainly be a worldwide audience. Read more
Vadim Rizov, Village Voice: Never trust a movie that ends with a moveon.org link. Read more