Dionyd was a Platonian who possessed psychokinetic powers.

He was the product of a mass eugenics program on the planet Sahndara. Dionyd was bred for contemplation, self-reliance, and longevity. The number of individuals generated by the program was pared down to thirty-eight. Before the planet's star went nova, this group resettled on Earth where they were exposed to the Greek civilization. When this civilization died, they moved on to Platonius where they founded their republic.

In 2268, he participated in a series of "games" designed to humiliate the USS Enterprise crew members and entertain the Platonians. (TOS: "Plato's Stepchildren")

Dionyd was played by Derek Partridge.
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