The Hyperdyne 129-4, or "sex synth", was a high end pleasure/love-slave model of synthetic popular amongst some high class circles on 22nd Century Earth.
- In Aliens: Earth Hive, two executives, Red and Green, were discussing the model line with one of the men thinking about purchasing one for himself due to the future success of a weapons system their company was developing. His friend and fellow executive then asked what about his friend's wife, which the man responded that he'd simply buy her one to keep her busy.
- In Aliens: Labyrinth, Judith was a "sex synth" programmed to keep her fellow crewmembers "happy."
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