Ancient Aliens S01E02: The Visitors

The episode proposes that alien visitations have occurred around the globe, and cites as evidence, claims that the Dogon people were given galactic knowledge by a star god; the Hopi and Zuni celebrations of Kachinas (or "gods from the sky") that are symbolized with headdress that are said to resemble modern space helmets; and that the Chinese Huangdi was a Han leader who came to Earth on a yellow dragon which is suggested to have been a metaphor for a spaceship.