Years ago while watching this picture on TV for the first time, I figured about half way through 'Hey, this ain't a sci-fi alien-on-the-rampage flick! It's an occult zombie movie hastily re-edited in a fever of post-production panic to cash in on the popularity of the same year's Alien'. Phew. What a literal thinker I was. Looking at IMDB's 'trivia' section, I see I was right. Wasn't I clever way back then? No. It really IS that obvious.
Disjointed, silly B movie. Not without some pleasures though. Keenan Wynn's fearful walk through a darkened underground car park worked for me, and there are a few unintended laughs here and there eg. William Devane's rather strange reaction to the sight of his dead daughter lying on a mortuary slab: he burps, and somewhat skittishly too. I wonder what Lee Strasberg would have thought of that. Perhaps William was expressing his heartfelt feelings toward the movie he found himself in. Actors get up to these tricks, you know.
And then there's Casey Kasem's police pathologist who is asked by a cop what colour the murderer's (still assumed to be human) skin is. Shaggy Kasem's reply of 'It's grey' is pleasantly creepy and recalls similar moments from Kolchak: The Night Stalker. In fact, Carl Kolchak's shadow looms large over this picture, even down to the unexpectedly spectacular denouement featuring a growling monster throwing cops bodily in all directions. VERY Kolchak.
Actually, damn it, I recommend this movie. It's enjoyable trash if you're in the right mood. But be warned - thanks to/in spite of post-production re-cutting (complete with inept Ed Wood type voice-over to fill in the plot holes) IT MAKES NO SENSE WHATSOEVER. Might be part of it's idiotic charm.