Truelly a great and entertaining piece of 50s Hammer Sci-Fi,and what a treat to own on DVD. Dean Jagger is excellent in his (Quatermass like) role as Dr Adam Royston and Leo Mckern is great as the scientists back-up man,a truelly tense little shocker, and what must contain one of the earliest melting-man scenes in a movie,if not the first. A CLASSIC go and BUY IT!!!!!