Harry Landers
Harry Landers  was the actor who played Arthur Coleman in the  third season episode . He filmed his scenes between Tuesday  and Wednesday  at Desilu Stage 9 and Stage 10.

Landers is best known for his regular role as Dr. Ted Hoffman on the popular 1960s medical drama Ben Casey, a part which he reprised for that series' 1988 reunion movie.

He died on 10 September 2017.  (SAG-AFTRA Magazine, Summer 2018, p.50)

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Performers
TOS performers