X 未知的元素是由Leslie  Norman  Joseph  Losey  执导，Dean  Jagger  Edward  Chapman  Leo  McKern  Anthony  Newley  等人主演的，于1956年上映，该科幻片讲述的是：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