Aliens may not have visited Earth, but ever since the invention of radio and television, humans have been sending signals into outer space, announcing their existence to other civilizations, so the question is not what if it happens, but rather when. With unprecedented access to everyone from the Director of the United Nations Office for Outer Space Affairs to experts from NASA, ISU (International Space University), the SETI (Search for Extraterrestrial Intelligence) Institute, and military advisors, this documentary builds up a believable scenario of first contact on Earth, beginning with the simplest of questions: Why are you here? How do you think? What do you see in humans that we don't see in ourselves? The implications unfold within a landscape of everyday sights and sounds turned bizarre and extraordinary, as if seen through the eyes of a life form exploring our planet for the first time.