(Wikipedia) The Nibiru cataclysm is a supposed disastrous encounter between the Earth and a large planetary object (either a collision or a near-miss) which certain groups believe will take place in the early 21st century. Believers in this doomsday event usually refer to this object as Planet X or Nibiru. The idea that a planet-sized object could collide with or pass by Earth in the near future is not supported by any scientific evidence and has been rejected as pseudoscience by astronomers and planetary scientists. The idea was first put forward in 1995 by Nancy Lieder, founder of the website ZetaTalk. Lieder describes herself as a contactee with the ability to receive messages from extra-terrestrials from the Zeta Reticuli star system through an implant in her brain. She states that she was chosen to warn mankind that the object would sweep through the inner Solar System in May 2003 (though that date was later abandoned) causing Earth to undergo a pole shift that would destroy most of humanity. The prediction has subsequently spread beyond Lieder's website and has been embraced by numerous Internet doomsday groups, most of which link the event to the 2012 phenomenon. Although the name "Nibiru" is derived from the works of the late ancient astronaut writer Zecharia Sitchin and his interpretations of Babylonian and Sumerian mythology, Sitchin denied any connection between his work and various claims of a coming apocalypse.
Theories passed down through Sumerian texts have people believing that we are not only an engineered race by alien visitors who produced us to be workers and then abandoned the mining project on earth. Taken further, this theory says that the "gods" will be back for us and that is the end of times.
As ludicrous as some of the theories seem, the concept of us being designed by an intelligent life is an obvious conclusion when you look at the coding of DNA alone as if we were programmed to run optimally when all the code is accurate.
We have signs from ancient times that leave us with lingering doubt. You don't have to have read Chariots of the Gods to understand that there have been many forms of man, many divergent ones that did and did not make the passage of time.
It is as if the makers created strong, but not powerfully thinking beings as workers and then gave us intelligence so that when they left us, we can master our world--a sort of reward for the hard work. That is the scenario I have developed on my own and it makes better sense than the concept that we are going to be approached again by the creators for some sinister reason. Like any parent, you get your kid smart enough to make it on their own and then you let them go about it.