常見版本：[DVD：標準清晰版] [BD：高清無水印] [HD：高清版] [TS：搶先非清晰版]
[雲播]：無需安裝任何播放器。
[雲播常見問題]
常見問題一：一直載入,沒有顯示視頻長度,建議更換播放源或刷新一下
常見問題二：速度慢,卡頓嚴重,建議更換播放源或按暫停等待視頻載入更多點
- 除了"X--未知的元素"你也可能喜歡以下影片：
X--未知的元素劇情介紹
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?