Documentary examining four of the most bizarre alleged alien sightings from the past five years to discover whether they really were visitors from other worlds. In Mexico, investigators gain access to the body of a supposed extraterrestrial infant, and use cutting-edge science, advanced scanning technology and DNA testing to try to determine its origin. The film also looks at the so-called Montauk Monster washed up on Long Island, New York, a mummy with an elongated head found by an anthropologist in the Peruvian Andes and a pale, snub-nosed creature seen by four teenage Panamanian boys, whose camera-phone images became an internet sensation.