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 III: The Search for Spock and Steve Blalock doubled for Nimoy, so that a total of seven actors contributed to the role. DeForest Kelley returns as Leonard McCoy, doctor and the carrier of Spock's living spirit. Kelley has the majority of the film's memorable scenes, but admitted to occasional difficulties in acting with and being directed by his longtime co-star. However, he has declared that he had no doubts about Nimoy's ability to direct the film. Responding to suggestions that "Star Trek" copied "Star Wars", Kelley asserted that the opposite was true. Playing the other crew members are James Doohan, as Montgomery Scott, the chief