Zero Hour dramatizes the hour leading up to some of the most memorable historical events as they unfold minute by minute. Using a real-time clock and a split screen to follow key players, the series reveals the compelling and exciting minutes leading up to events that changed the world.

On 1 February 2003, the U.S. Space Shuttle Columbia disintegrates while re-entering the Earth's atmosphere over Texas and Louisiana causing the deaths of all 7 crew members.