该电影由Leslie Norman、Joseph Losey执导，Dean Jagger、Edward Chapman、Leo McKern、Anthony Newley等主演，于1956年上映。在76分钟的叙事中，《X--未知的元素》（又名：内详）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?