saucerian

noun2

1. •
   An extraterrestrial being visiting the Earth.

   • The saucerians are here from another, dying, planetary system; they contact Marvin later, and now talk slowly enough to make themselves understood. — 2017
2. •
   A person who has communicated with an extraterrestrial being.

   • The “contactees” or “saucerians” surfaced in 1952 in southern California. They presented themselves as selected by superior beings from other planets for a special assignment—save the world. — 2001