Low-key but intriguing and generally effective variation on the alien invasion theme (though the script is far inferior to the Quatermass archetype); as a matter of fact, the police procedural tends to be more engaging than the high-falutin' scientific theorizing! Unfortunately, too, some of the dialogue is unintelligible due to the heavy British accents (but, then, the version I watched was accompanied by subtitles in Italian!).
The cast features several familiar British faces (Maurice Denham, John Carson, Jack Watson, etc.); still, as with many low-budget horror films of its era, the lead role was given to an American actor: in this case, John Saxon - who's pretty adequate under the circumstances, with a blonde Patricia Haines (whom I recently saw in the awful VIRGIN WITCH [1972]) as his female co-star. Aubrey Morris, however, is memorable as the scurrilous editor of a 'girlie' magazine - which is used as bait for the alien's female victims (who, as is often the case, has descended to Earth because his own planet has reached saturation point). This element gives way to some typically dry British humor (especially the awkward interrogation of one of the missing girl's simple but cantankerous parents)...but Ballard Berkeley's belated introduction as the Commander steering the operations engaged in the alien's capture can't be taken seriously - in view of his regular appearance as the befuddled Major in the classic TV comedy series FAWLTY TOWERS (1975-79), devised by and starring Monty Python's John Cleese!!
With the imposing figure of the alien generally shown lurking in the shadows or hidden behind heavy clothing and a mask (shades of the giallo subgenre?), its menace is evoked through the creature's adoption of a mellifluous yet sinister 'human' voice; that said, the make-up effects shown intermittently are surprisingly subtle. Even so, the best thing about the film is certainly Stephen Dade's chiaroscuro photography - utilizing some odd angles, particularly during the alien manhunt, obviously inspired by THE THIRD MAN (1949)! The rather uneventful cautionary finale, then, is reminiscent of THE DAY THE EARTH STOOD STILL (1951).
