Head of security on planet Dramia. When the U.S.S.
Enterprise visited Drama, he arrested Dr. McCoy on
the charge of mass murder. When the Enterprise
travelled to Dramia II to investigate into McCoy's
charges, Demos pursued the Federation ship and boarded
the vessel through the shuttlecraft hangar bay. Captain
Kirk impounded his vessel but allowed Demos to accompany
he and Mr. Spock to Dramia II. When the ship passed
through the aurora in the vicinity, Demos, along with
everyone else, fell victim to the plague contained
therin. When Dr. McCoy found a cure for the plague,
Demos dropped all charges against him.