Some treasures of antiquity contain irrefutable proof that the human race descends directly from ancient alien beings who visited Earth. This episode relies on archeological discoveries with a cosmic twist to examine the merit of such a theory.

This investigative series takes a definitive, scientific look at the search for unidentified flying objects, documenting UFO stories that have been debunked and bringing viewers up-to-date on the state of the most famous UFO investigations, many of which still remain unresolved and unexplained to this day.