It was the weapon to end all weapons: the doomsday device. A huge nuclear bomb so powerful that it could envelop the entire planet in a cloud of radioactive dust, and bring about instant extinction. This is the untold story of the Cold War's most insane plan, the men behind it and how it nearly happened. It is also the history of humanity's nightmare vision of a superweapon, showing how popular culture, from the stories of H. G. Wells and Jules Verne to films such as "Planet of the Apes", "Mad Max" and "Dr Strangelove" itself have both shaped and reflected our darkest dreams.