Four astronauts returning from man's first mission to Mars enter a time warp and crash on a 26th Century Earth devastated by atomic war. At first unaware where they are, but finding the atmosphere safe to breathe, they start exploring and find themselves in a divided future where disfigured mutants living like cavemen inhabit the surface, while the normals live comfortably below the surface but are dying as a race from lack of natural water, air and sunlight.
Lucas Marsh, an intern bent upon becoming a first-class doctor, not merely a successful one. He courts and marries the warm-hearted Kristina, not out of love but because she is highly knowledgeable in the skills of the operating room and because she has frugally put aside her savings through the years. She will be, as he shrewdly knows, a supportive wife in every way. She helps make him the success he wants to be and cheerfully moves with him to the small town in which he starts his practice. But as much as he tries to be a good husband to the undemanding Kristina, Marsh easily falls into the arms of a local siren and the patience of the long-sorrowing Kristina wears thin.
Richard Dadier is a teacher at North Manual High School, an inner-city school where many of the pupils frequently engage in anti-social behavior. Dadier makes various attempts to engage the students' interest in education, challenging both the school staff and the pupils. He is subjected to violence as well as duplicitous schemes.
Willy Loman is an aging salesman who was recently fired from his job. Dealing with feelings of failure, Willy begins to relive events from the past that involve his older son, Biff, and his wife, Linda. Willy tries to learn from past mistakes and works to make amends with his family, but his biggest struggle is to make peace with himself over a failed dream of financial success.
