Leonard McCoy is confronted with the unusual silicon-based Horta alien in "The Devil in the Dark" (1967), saying, "I'm a doctor, not a bricklayer." The line was used in "Terra Nova". Kelley himself parodied the phrase for a "Trivial Pursuit" commercial, in which the question is asked "How many chambers does a human heart have?" Kelley appears on screen and replies "How should I know? I'm an actor, not a doctor!". Leonard McCoy Dr. Leonard H. "Bones" McCoy is a character in the American science fiction franchise "Star Trek". First portrayed by DeForest Kelley in the , McCoy also appears in the
Star Trek: The Original Series (season 3) Star Trek: The Original Series (season 3) The third and final season of the American science fiction television series , premiered on NBC on September 20, 1968 and concluded on June 3, 1969. It consisted of twenty-four episodes. Star Trek: The Original Series is an American science fiction television series created by Gene Roddenberry, and the original series of the Star Trek franchise. It features William Shatner as Captain James T. Kirk, Leonard Nimoy as Spock and DeForest Kelley as Leonard McCoy. This is the first season to air after NBC moved the show from 8:30 P.M. to 10 P.M.