《X--未知的元素》是1956年上映的英國科幻片電視劇，導演是Leslie,Norman,Joseph,Losey，主演包括Dean,Jagger,Edward,Chapman,Leo,McKern,Anthony,Newley。影片的劇情　　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?一部科幻片類型科幻片