In the original Star Trek series episode The Cloud Minders, the planet "Merak II" is said to be suffering from a botanical plague that can only be treated by the use of the mineral zenite.
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His best-known science fiction appearances were in "O.B.I.T.", an episode of The Outer Limits; "The Cloud Minders", a third-season episode of Star Trek, in which he played High Advisor Plasus; and "Z'ha'dum", the third-season finale of Babylon 5, in which he played Justin, and as Caspay in Beneath the Planet of the Apes.