Look at these images. They show ufo sightings in artwork from thousands of years old from all over the world.

Zecharia Sitchin: http://www.crystalinks.com/sitchen.html
Extraterrestrials and UFO'S index: http://www.crystalinks.com/extra.html
Extraterrestrials: http://www.crystalinks.com/ets.html
Ancient Astronauts: http://www.crystalinks.com/ancientastronauts.html
Ancient and Lost Civilizations: http://www.crystalinks.com/ancient.html

With:
Search for planet X: http://xfacts.com/x.htm
Sumerian Artifacts: http://www.xfacts.com/ancient/
Mars-Earth connection: http://xfacts.com/mars_sub.htm
Ancient depictions of UFO's: http://www.xfacts.com/old/
Ancient Knowledge: http://www.xfacts.com/map/

Zecharia Sitchin (born 1922) is a best-selling author of books promoting the ancient astronaut theory for human origins. He attributes the creation of the ancient Sumerian culture to the Annunaki (or Nephilim) from a hypothetical planet named Nibiru in the solar system. (from wiki)

Theories on Human Origins by Alan F. Alford. Interesting because it also speaks about the Soul-Substance Theory that brings in a spiritual element into the evolution story. On that matter you may also want to read this article from Wiki on Lamarckian evolution http://en.wikipedia.org/wiki/Lamarckism. It might very well be the missing link between the creationists and the evolutionists. In this case we would be talking about evolving creation but even a step further would be creative evolution: a spiritual influence directing evolution over thousands of years.

Wikipedia about the person and work of Sitchin.