Aug 14, - Leonard Nimoy last appeared in a television show as Mr. Spock when he guest-starred in an episode of Star Trek: The Next Generation. Peck's version of the character will predate Nimoy's Spock. His role in the storyline for Discovery remains mysterious. Feb 28, - This week marks the third anniversary of the passing of Leonard Nimoy. One way to remember the man who made Spock a legend is to listen to.