Yes, it's the most boring invasion in the history of science fiction cinema. Awarding this story the title of Invasion is akin to me referring to my recent air conditioner water leak as The Great Flood. Blimey, this film has problems. I wish I could go through the whole story here and just pick apart all of the inconsistencies, unanswered questions, and downright silliness of the thing. Some people who have seen this movie seem to have a fond place in their heart for it - mainly those who remember seeing it when it came out in 1965 - but I'm not among them. Even though writer Robert Holmes went on to become one of the most prominent writers on Dr. Who and even adapted parts of Invasion for Jon Pertwee's first episode as the Doctor, I find this movie's script to be quite poor.
The story begins with a spaceship crashing in a remote area of Southern England. Now you would think a member of an advanced alien race would have more sense than to step out in the road and just stand there in front of an oncoming car, but that's exactly what our spaceman does. The driver carries his victim to the hospital in the back seat of his car, but it makes for quite a thorny issue for him. Not only are the police less than inclined to believe his story, he has to cover up the fact that he was stepping out with another woman. The alien victim looks like a normal Asian man - until the docs see that his blood is not human and that he has some kind of communications device embedded in the speech and motor section of his brain. The stranger seems perfectly friendly once he awakens and tells them of his need to recapture two escaped alien prisoners who escaped in the aftermath of the crash, but the situation begins to deteriorate as the hospital finds itself cut off from the outside world by some kind of invisible wall. And, lest you forget, there are two other aliens out there somewhere planning who knows what.
There's really not a lot of action in this movie - no melees with alien weapons, alien mind control, heroic fisticuffs, etc. There is a lot of standing around, sitting around, and leaning about - and sweating. As the long night of the "invasion" wears on, the heat begins to rise in the hospital, threatening the lives of actual human patients and wearing down the doctors and nurses. Of course, with Dr. Claire Harland (Valerie Gearon), it's not all that noticeable because she slowly saunters about as if she's practicing for a zombie tryout to begin with - and the whole situation loses some of its impact when we learn the actual temperature everyone is having to deal with. I must say that I did like Dr. Mike Vernon (Edward Judd), though; he's the closest thing this movie has to a take-charge guy (the military types don't do much at all and the aliens themselves are surprisingly slow to make any moves).
Invasion actually isn't as boring as it really should be, so I guess the cast and director Alan Bridges deserves some credit in that regard. This certainly isn't your typical 1960s science fiction film, that's for sure. Whether that's a good thing or a bad thing is something you'll have to decide for yourself.