According to one theory put forward by David Icke, humanity is actually under the control of shape-shifting alien reptiles, who require periodic ingestion of human blood to maintain their human appearance. Reportedly the Bush family and the British Royal Family are actually such creatures, and Diana, Princess of Wales was aware of this, presumably relating to her death. The proponents claim a number of evidence ranging from Sumerian tablets describing the "Anunnaki" (which he translates as "those who from heaven to earth came"), to the serpent in the Biblical Garden of Eden, to child abuse and water fluoridation.
A variant tells that particular technologies, notably the transistor—were given to American industry in exchange for alien dominance. The enforcers of the clandestine association of human leaders and aliens are the Men in Black, who silence those who speak out on UFO sightings. This conspiracy theory has been the basis of numerous books, as well as the popular television show The X-Files and the movies Men in Black and Men in Black II.
In the far distant past around 240 millions BC, an intelligent technological species of theropod did evolved on earth. This species developed space travel and established colonies in nearby star systems. The asteroid impact that apparently occurred 65 million years ago devastated this civilization as well as nearly destroying the entire ecosystem. With their home civilization on earth devastated, the colonies were left to evolved on their own. It would be likely that the earth would be monitored and as the ecosystem recovered these reptoids would resume operations on earth. Given the distances and effort involved to move resources back to earth, it is likely that a need to augment the local work force with a native labor force that could accomplish the more menial and laborious tasks. A simple means of acquiring this labor would be to utilize local terrestrial stock and genetically alter this stock as necessary to accomplish these goals. This idea is not without precedent, since mankind itself has done this with horses and other domesticated livestock. It is likely that this is how modern man was developed.
Given the current status of humanity, it is likely that problems arose almost immediately with this race, simply put, they could not overcome the instinctive aggressive and independent nature of the base stock. It was because of these problems that another subservient race was developed. This race however, was not derived from local stock but was engineered from scratch to fill the need and to overcome and prevent the problems encountered earlier. The result of this effort was the grays. It was discovered that for certain tasks, the independent nature of humans was a desirable trait, and also these humans proved to be a ideal host for the gestation of the gray's fetus. Therefore, although the grays replaced humans for most tasks, human were continued to be utilized within the society on a limited basis. It is from this human group that the Adamski/Meier humans might be derived.
After a time, the interest in earth declined, and only a small observation post was left in operation. Mankind was therefore left to develop on earth with only occasional interaction with its former inhabitants. In the meantime, the reptoids were continually modifying the grays, and developing specialized grays for specific tasks.
At some point, the grays evolved enough cognitive abilities to realize there status, and it is this faction of grays that is active on earth attempting to overcome their built in limitations. It is the remoteness of earth that allows this group of grays the required freedom of action.
To gain sustenance these grays must obtain certain nutrients and the simplest and most direct means is to mine them from local fauna.
To reproduce, the grays must obtain host females (called a "container"). Since utilizing the native population of humans currently carries little risk of interdiction, and no requirements for maintaining the host, this method is preferred. Specialized grays, (these grays are taller and more slender that the basic stock) developed specifically to work in genetic engineering labs, oversee these operations as well as the effort to cross-breed their race with humans in an effort to overcome the built in limitations. Females are taken, the DNA evaluated, and if acceptable, the female is tagged for future recovery. Males are also evaluated, and if suitable, tagged for future recovery, some of these males may be used to impregnate current stock of host females in order to assure the transfer of desirable traits to future hosts females.
Other activities involve evaluating the nervous and other systems and tissues in order to optimize the ongoing development their cross-breed's capacities.
The greys have several ongoing problems:
On April 30, 1964, the first communication between these aliens and the U.S. Government took place at Holloman Air Force Base in New Mexico. Three UFO landed and a meeting was held between the aliens and intelligence officers of the U.S. Government.
During the period of 1969-1971, MJ-12 representing the U.S. Government made a deal with these creatures, called EBE's (Extraterrestrial Biological Entities, named by Detley Bronk, original MJ-12 member and 6th President of Johns Hopkins University). The "deal" was that in exchange for "technology" that they would provide to us, we agreed to "ignore" the abductions that were going on and suppress information on the cattle mutilations.
The EBE's assured MJ-12 that the abductions (usually lasting about 2 hours) were merely the ongoing monitoring of developing civilizations. The U.S. Government was not initially aware of the far reaching consequences of their "deal". They were led to believe that the abductions were essentially benign and since they figured the abductions would probably go on anyway whether they agreed or not, they merely insisted that a current list of abductees be submitted, on a periodic basis, to MJ-12 and the National Security Council.
By the time we had found out the truth about the intentions of the Greys (they intend to stay here and stay in control of our world) it was too late. We had already "sold out" humanity. Not that it would have made any difference, because they were here doing what they were doing anyway.
In 1983, a story was outlined by government sources that said that the Greys are responsible for our biological evolution through manipulation of the DNA of already evolving primates on this planet. Various time intervals of the DN A manipulation were specified for 25,000, 15,000, 5,000, and 2,500 years ago.Originally, the government thought that the Greys meant us no harm, but today, in 2012, the picture that is emerging is exactly the opposite.