Def-Con 4

As the astronauts of the Nemesis Missile Station orbit the Earth, World War III erupts below in a convulsive holocaust of nuclear fury. Months later, the spaceship is forced to crash land back on Earth, where the crew finds a wasteland ravaged by radiation and overrun by desperation, disease and cannibalism. But when they are captured by a group of sadistic survivalists, the astronauts find themselves in one final earthbound battle against time, contamination and total nuclear annihilation...