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Player Race: No
Relation to UFP:

- Don't want to make half the crew nuts do we?

Intelligent non-corporeal life-forms whose minds are believed to be among the most beautiful in the universe.  By contrast, Medusans' physical appearance is so hideous that one look at a Medusan by a human will cause total madness in the human unless the human is wearing a protective visor.  While traveling aboard the Enterprise, Medusan ambassador Kollos shielded himself in a protective container in order to protect the human members of the crew.  Medusans' sensory systems are radically different from those of humanoid life-forms, and their ability to orient themselves in subspace makes them well suited for navigational tasks aboard starships (Is There in Truth No Beauty? -TOS).
Star Trek: The Encyclopedia (1999 edition).