The small town of Dulce, New Mexico, may harbor one of America's darkest secrets – an underground alien base. Ben Hansen travels to New Mexico to figure out if the rumors are true and uncovers multiple reports of UFO sightings, alien abductions and more.

Ben Hansen heads down to Florida to investigate a woman's claim that an extraterrestrial approached her in her backyard. He wonders if this highly credible sighting is connected to a similar 1955 incident known as the Kelly-Hopkinsville Encounter.