The idea to be the only race on a planet in whole universe is the most programmed brain fart you can ever imagine. Just look up, all stars you see are suns with planets encircling them. Many carry beings much more advanced as you, because they are not throttled by a insane elite to make money with old technology. These beings were always on earth, evolving human body with genetic change and so today there are a huge part of alien DNA inside you. What your scientist have proven and reported in their magazines.
Like you to give this talk, with some background and the amazing hybrid girl that was of the earlier results and have not complete human type eyes. Be assured that today hybrids coming to you look the same like you, no way to detect them from outside.