Simian is a criminal on the planet Rillaan.
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He was sentenced to life imprisonment on the planet Hadante. Once he arrived he was healed of his blindness by Linea. He followed SG-1 and Linea as they escaped through the gate to P2A-509. Major Carl Warren found him sneaking around and brought him to Stargate Command. He told Major General George S. Hammond that Linea was a murderer and she caused a disease which wiped out half of his world before she was caught. (SG1: "Prisoners")