(written from a Production point of view)
Sharon Acker (born 2 April 1935; age 81) is a Canadian-born actress who appeared once on Star Trek: The Original Series, playing Odona in the third season episode "The Mark of Gideon". She filmed her scenes on Wednesday 23 October 1968, and between Monday 28 October 1968 and Wednesday 30 October 1968 at Desilu Stage 9.
Acker was a regular on the soap opera Executive Suite (1976-77), as were fellow Star Trek guest stars Richard Cox, Leigh J. McCloskey, Paul Lambert, Madlyn Rhue, Percy Rodriguez, Mitchell Ryan, and William Smithers. Other television series on which she appeared include Mission: Impossible (featuring Leonard Nimoy and produced by Desilu), Gunsmoke, Marcus Welby, M.D., Barnaby Jones (with Lee Meriwether and Vince Howard), The Rockford Files, and Quincy, M.E. (with Robert Ito and Garry Walberg).
She has also appeared in a number of made-for-TV movies and specials, including: 1970's A Clear and Present Danger (a pilot for a short-lived series on which she would star) with Jeff Corey and Michael Bell; 1973's The Stranger, co-starring Glenn Corbett; 1974's The Hanged Man, with Barbara Luna; and the 1980 Battlestar Galactica movie Conquest of the Earth, featuring John Colicos. She also has a few films to her credit, most notably 1967's Point Blank, which co-starred James B. Sikking, Sid Haig, and Michael Bell.