Socius was a holographic program developed by Dr. Josua, who created a female hologram which he called Socius and which monitored his laboratory on Atlantis. Dr. Rodney McKay, considered that the technology is within a designated Companion laboratory that allowed them to read the minds of their owners. So they could anticipate their thoughts and worked to respond to their needs. The only known Companion that remained in operation Atlantis when Atlantis expedition came was Socius, and she showed an obsessive desire to remain alone with her owner. (SGA: "The Companion")

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