Josh begins his search for extraterrestrial life with a once-in-a-lifetime visit to NASA. He then hunts for evidence of aliens in Chile, where he views a UFO video captured by the military and assists scientists at the largest telescope on Earth.

The hunt for alien life continues in Zimbabwe, where Josh interviews witnesses from one of the largest UFO sightings in modern history. Then, in England, he investigates the infamous case that has become known as "Europe's Roswell."