The crossword solution for the term 'SPOCK ON 'STAR TREK'' is 'NIMOY', which is a five-letter word. Leonard Nimoy was an American actor, director, poet, singer and photographer who is best known for his portrayal of the half-Vulcan, half-human character Spock on the science fiction television series 'Star Trek'. He played the role from 1966 to 1969 and reprised it in six feature films and guest appearances in various other 'Star Trek' productions.