It came originally from the merciless, frost-bound wilderness of the night side of Mercury, the hellish planet nearest to the Sun. But when space explorer Harry Dagenham brings a long-dead, petrified snake--or something--back to Earth from Mercury, he discovers--quite suddenly--that the rock-hard creature is not quite so inert as it first appears! Here are six extraordinary stories from the golden age of the pulps: "Something from Mercury," "The World That Dissolved," "Pre-Natal," "Beyond Zero," "Across the Ages," and "Twilight Planet." Great science-fiction adventure from the pulp magazine era!