Star Trek: Amok Time

"Amok Time" is the second-season premiere episode of the American science fiction television series, Star Trek. It is episode #30, production #34, first broadcast on September 15, 1967, in the series' new time slot of 8:30 pm on Friday night, and repeated April 26, 1968. It was the first episode to feature regular cast member Walter Koenig, as the ship's navigator, Ensign Pavel Chekov, and also the first one to list DeForest Kelley as Dr. McCoy in the opening credits. It was written by science fiction author Theodore Sturgeon, scored by Gerald Fried, and directed by Joseph Pevney. The episode features First Officer Spock returning to his homeworld for a brutal Vulcan mating ritual. It is the only episode of the series to depict scenes on the planet Vulcan.