Philosophical 1950s science fiction, written by groundbreaking novelist Richard Matheson, and based on his own book. Scott Carey (Grant Williams) is enjoying a boating trip when his yacht passes through a mysterious cloud of radioactive mist. Returning home, Scott is shocked to discover that he is slowly shrinking. Before long, ordinary household objects become tools in his battle for survival against previously harmless pests like spiders, and even his pet cat. Trapped in the basement of his house, Scott gradually prepares himself to face infinity as he shrinks into a sub-atomic world, and out of existence.