World War 3 breaks out and a nuclear nightmare becomes reality as thousands of hydrogen bombs destroy the world's greatest cities. A deadly fallout of ash and debris creates a Nuclear Winter, plunging the planet into a sudden Ice Age. Crops fail worldwide and mass starvation drives humanity to the brink of extinction.

The most powerful blast of cosmic radiation in the Universe is just seconds from slamming into Planet Earth. When a gamma ray burst from two colliding stars hits the atmosphere, the deadly radiation delivers agonizing death and immediately wipes out half the planet. On the other side of the Earth, the Americas face a slower death as ultraviolet radiation and starvation threaten to send the human race into extinction. How will the last remaining humans survive?