Existentialism goes pop in this benchmark of atomic-age science fiction, a superlative adaptation of a novel by the legendary Richard Matheson that has awed and unnerved generations of viewers with the question, What is humanity's place amid the infinity of the universe? Six months after being exposed to a mysterious radiation cloud, suburban everyman Scott Carey finds himself becoming smaller… and smaller… and smaller until he's left...

In 1973, the first manned expedition to Mars is marooned. By the time a rescue mission arrives, only the leader of the expedition is left alive. He is accused of murdering his crew and is taken into custody. As the rescue ship returns to earth, the real killer, a life-devouring monster that has stowed aboard, begins attacking the crew. The remaining crew must find some way to stop it before the ship returns to a panic-striken Earth

Disc one of third season, 1961-1962, of Rod Serling's classic series exploring the fantastic and frightening.