In the 21st century, powerful computer systems were invented. but humanity failed to control them. Near the end of the century, one such computer system, the weapon system Orion, triggered a devastating nuclear war, bringing the human race close to extinction due to the nuclear fallout. The remaining human survivors find shelter and go into a cryogenic sleep. Waking up 100 years later, they go out onto the surface, to face a new, unknown world...