Real World article
(written from a Production point of view)

Donald "Don" Eitner (born 29 November 1934; age 83) played the unnamed navigator in the Star Trek: The Original Series episode "Charlie X".

He was also William Shatner's body double as "Evil Kirk" or "Good Kirk" in "The Enemy Within".

Besides his two Star Trek appearances, Eitner played larger roles in many television series and TV movies, including 12 O'Clock High, The Fugitive, Lost in Space, Desilu's Mission: Impossible and Mannix, Columbo, The Rockford Files, M*A*S*H, Cannon and Dynasty, spanning four decades.

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