講述三個太空人升空後與太空總署失去聯絡，若干時間後太空船返回地球，援救隊卻發現太空船內只得一個太空人Carroon生還，原來他已被外星生物佔用了肉體，更要把地球毁滅。

Professor Bernard Quatermass, Director General of the British Experimental Rocket Group, launches the first manned space flight from Australia. A malfunction sends the rocket and its three man crew thousands of miles off…