If you think about the Grey Aliens which are actually cloned alien beings, created by the Tall Aliens as a slave race. And since their revolt against the oppressive regime of the Reptilian Aliens, the Grey Aliens have wondered into the far reached of the milky-way Galaxy and the Universe. But still, they are out there somewhere.
The Grey Alien are also responsible for many close encounters experienced by modern-day people and have become a pop-culture phenomenon since the reports of Roswell, New Mexico and Area 51 that is said to house dead remains of Grey Aliens. Today, its known that Grey Aliens have made secret agreements with Earthly governments. These agreements allow the Grey Aliens to experiment with human test subjects to find a solution to their most dire problem, the extinction of the Grey Alien race.
(The United States made one or more agreements with a species described as the tall Greys, and has agreed not to interfere with alien operational plans in trade for technology. Agreements made In 1934, 1964, and 1972.)
David Icke has become an influential voice on modern awakening and the social agendas seen below the surface. And here is the historical evidence about this phenomenon.