Commander Demos was an agent of the Dramen government during the late 23rd century.

In 2270, he served the arrest warrant for Leonard McCoy, which charged McCoy with mass murder on Dramia II.

Aboard a patrol ship, Demos later followed the USS Enterprise to Dramia II in the hopes of stopping her crew from conducting an investigation on that planet. He noticed nothing amiss when Kirk opened the shuttlebay doors and let his craft enter.

He later joined the crew of the Enterprise as they visited the surface of Dramia II, and later yet become infected with the Dramia II plague on the return trip to Dramia. (TAS: "Albatross")

The voice of Demos was supplied by Lou Scheimer.
Demos was described in the script as the "Head of Security Forces" who was "about Kirk's age".
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