Star Trek’s Mr. Spock: In Pictures

Leonard Nimoy as Mr. Spock in the Star Trek episode, "Spock's Brain " season 3, episode 1. CBS Photo Archive/Getty Images

Leonard Nimoy as Mr. Spock in the Star Trek episode, "Plato's Stepchildren" season 3, episode 10. CBS Photo Archive/Getty Images

Majel Barrett as Nurse Chapel and Leonard Nimoy as Mr. Spock in the Star Trek episode, "Plato's Stepchildren" season 3, episode 10. CBS Photo Archive/Getty Images

Leonard Nimoy as Mr. Spock in the Star Trek episode, "The Cloud Minders" season 3, episode 2. CBS Photo Archive/Getty Images

William Shatner as Captain James T. Kirk, Leonard Nimoy as Mr. Spock, James Doohan as Montgomery "Scotty" Scott and DeForest Kelley as Dr. Leonard "Bones" McCoy in the Star Trek episode, "Spock's Brain" season 3, episode 1. CBS Photo Archive/Getty Images

William Shatner as Captain James T. Kirk speaks into his communicator with Leonard Nimoy as Mr. Spock in the Star Trek episode, "Spock's Brain" season 3, episode 1. CBS Photo Archive/Getty Images

William Shatner as Captain James T. Kirk and Leonard Nimoy as Mr. Spock in the Star Trek episode, "The Cloud Minders" season 3, episode 21. CBS Photo Archive/Getty Images

Leonard Nimoy as Mr. Spock and Joanne Linville as Romulan Commander in the Star Trek episode, "The Enterprise Incident" season 3, episode 2. CBS Photo Archive/Getty Images

Leonard Nimoy as Mr. Spock and James Doohan as Montgomery "Scotty" Scott in the Star Trek episode, "The Cloud Minders" season 3, episode 21. CBS Photo Archive/Getty Images

William Shatner as Captain James T. Kirk and Leonard Nimoy as Mr. Spock in the Star Trek episode, "Plato's Stepchildren" season 3, episode 10. CBS Photo Archive/Getty Images

Diana Ewing as Droxine and Leonard Nimoy as Mr. Spock in the Star Trek episode, "The Cloud Minders" season 3, episode 21. CBS Photo Archive/Getty Images

Leonard Nimoy as Mr. Spock in the Star Trek episode, "Spock's Brain" season 3, episode 1. CBS Photo Archive/Getty Images