X--未知的元素是由Leslie Norman Joseph Losey 執導，Dean Jagger Edward Chapman Leo McKern Anthony Newley 主演的一部科幻片。主要講述了：British Army radiation drills at a remote Scottish base attract a subterranean, radioactive entity oBritish 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