From mysterious megalithic ruins in Bolivia and giant sarcophagi in Egypt, to galactic stargates and over 100,000 newly uncovered Maya structures, to the incredible revelations of UFO pioneers and government whistleblowers, season 20 of Ancient Aliens® further examines the theory that extraterrestrials have been visiting Earth for thousands of years. Now, at a time when scientists and space agencies around the world are engaged in the search for extraterrestrial intelligence, the series embarks on a deep dive into the most compelling evidence surrounding the age-old question: Are we alone in the universe?