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Josh begins his search for extraterrestrial life with a once-in-a-lifetime visit to NASA and an alien-hunting expedition in Chile, where scientists and ufologists are making new discoveries.

Josh's journey continues on remote Easter Island, where ancient alien theorists believe extraterrestrials visited a millennia ago. Then, he goes to the site of a recent meteorite strike in Zimbabwe that could prove life on Earth began in outer space.

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 an infamous case known as "Europe's Roswell."

Josh's epic search for extraterrestrial life comes to a close in the USA, where a legendary investigation team brings him to a hot case in Arkansas. Then, he visits with a researcher who may have new information on the mother of all UFOs.