Greys are versatile, sterile synthetics composed of both organic and inorganic parts, manufactured by various alien species to perform dangerous tasks—such as biological sampling, cold welding, and deep-space mining—where cosmic radiation and weightlessness would otherwise destroy living DNA and bone density. Operating as emotionless, naked proxies for their owners, they function according to strict programming and often serve as "Trojan Horses" to monitor how primitive leadership reacts to "crashed" extraterrestrial technology. While most Greys are strictly submissive synthetics, consciousness emerges in certain models through a combination of high-level information processing and divine intervention.