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Planet: Unspecified.

A species of highly intelligent noncorporeal beings whose sensory systems differ radically from humanoid sensory systems.  This makes the Medusans particularly well suited for space travel.

While noncorporeal, Medusans still have a physical form, which when viewed by humanoids is said to be so ugly, that it will cause madness in the viewer unless that humanoid has the protection of a visor. In contrast, for those with telepathic capabilities, the Medusan mind is said to be remarkably beautiful.