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!