Could the human race become suddenly extinct? We count down seven ways in which the world as we know it could meet an abrupt and untimely end, from a mammoth asteroid strike to the eruption of a super volcano. What would happen as computers literally become trillions of times smarter than we are--would they program our mass murder? Scientists, experts, and witnesses describe these and other vividly pictured disaster scenarios, from super bugs created in secret labs to black holes that could suck earth into oblivion. Using state-of-the-art computer-generated graphics and interviews with the world's top scientists, we will leave viewers pondering humanity's place in the universe and will reveal the most terrifying truth of all--that our greatest enemy is ourselves.