An extraterrestrial meteorite fell to the earth with an unknown virus, causing a global infection. Humans infected with the virus mutated. At the same time, global satellite communications were interrupted and the power system failed.
The earth's latitude, human genes, weather have all changed, unknown plants, mutated zombies, these changes have made the remaining humans even worse. The remaining humans are hiding underground to survive. A RV made of spaceship materials has been continuously upgraded and transformed into a doomsday fortress.
