John Lindesmith
John Lindesmith  appeared in two episodes of  as an Enterprise crewman in the first season and later in the third season. 

He filmed his scenes for "Charlie X" on Tuesday  and Wednesday , and his scene for "The Paradise Syndrome" on Tuesday , all at Desilu Stage 9. He only received credit for his second appearance. 

The bulk of roles during his brief television career were as military servicemen. Before his appearances on Star Trek, Lindesmith made three appearances on Gene Roddenberry's prior series, The Lieutenant (1963-1964; starring Gary Lockwood, with John Arndt, Paul Comi, Walter Koenig, Paul Lambert, Steven Marlo, and Carey Foster). 

Following his appearances on Star Trek , he appeared on Lucille Ball's Here's Lucy (1969; with Ball and Sean Morgan), with his final TV appearance on Herbert F. Solow's Medical Center (1969; with James Daly, Byron Morrow, Garth Pillsbury, and Mary Linda Rapelye).

Outside of his acting career, Lindesmith served in the US Army during the Vietnam War.

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Performers
TOS performers