What if we are nothing more than an alien experiment? The meaning of aliens is something foreign, from another place. The problem here is that we use the information provided by Hollywood to educate ourselves. We don't know if extraterrestrials exist but if we use a little common sense, arrogance aside if we think of the immensity of the universe, there is a very high probability that somewhere far away some higher form of civilization does exist. Do you really think they would be interested in taking over the earth? I don't know the answer to that but if some advanced extraterrestrial species would ever want to control us, we wouldn't even notice, we would be just a goldfish in the tank.