"If you're seeing this," warns Steven Greer within the first two minutes of his sort-of-documentary, "it's because I'm either dead, or have been entrapped, or have disappeared." Or, perhaps, because I want to hook your attention. In Close Encounters of the Fifth Kind, we quickly learn that Greer is neither dead nor disappeared. But he does appear to be trapped in Batman's garage from the Dark Knight movie series. And it is from that stale bunker-like locale that he preaches to us, with interlude narrations from Jeremy Piven, for the next two hours. A medical doctor turned UFO researcher, Greer...