British Army radiation drills at a remote Scottish base attract a subterranean, radioactive entity of unknown nature that vanishes, leaving two severely radiation-burned soldiers... and a bottomless crack in the earth. Others who meet the thing in the night suffer likewise, and with increasing severity; it seems to be able to absorb radiation from any source, growing bigger and bigger. What is it How do you destroy a thing that feeds on energy《X--未知的元素》是Leslie,Norman,Joseph,Losey于1956 年在英国 导演，由Dean,Jagger,Edward,Chapman,Leo,McKern,Anthony,Newley等出演,剧中使用英语对白,是一部科幻片电影。