Bellatrix (Gamma Orion) is one of the main stars in the constellation of Orion, and lies at a distance of approximately 112 light years. It is seen from the Northern hemisphere on Earth as the right shoulder of the Hunter. This system is the home of dynoid and reptoid civilizations, or, to put it in other words, of lizzies and reptilians. It is also said to be the home of several species of Greys. (Types A, B and C. Type C is apparently only found in the Bellatrix and Rigel systems).
The negative image people sometimes associate with Orion mainly has to do with Bellatrix (which is Latin for 'fighter' or 'warrior'). The lizzie-inhabitants of the Bellatrix system focus upon expansion and colonization. Other keywords to describe its civilization are oppression and control. They have an extremely advanced technology. Stories about abductions and implants as controlling devices that are linked to Orion, nearly always have to do with Bellatrix.
The Branton material mentions "a huge colony of hybrid Reptilian-insectoid mercenaries, the result of Reticulan genetic engineering" in the Bellatrix system. It also mentions a lizard-like race, "snake men," as well as a dinoid civilisation.