Any film that deals with international relations and the future of the planet has merit these days. This is an extremely hard film to find, but is available at Horror Theatre online. I have always liked the spare black & white treatment of such international science fiction. This one involves the old "alien taking over human bodies" storyline, but it's handling here is well done and unique. I was particularly struck with how ruthless some the "death" scenes were. The aliens' lack of emotion seemed appropriate to me. The film runs a little long, and some of the scenes talk too much, but if you stick with it, I think you will find its overall appeal. Good ending.