"Amok Time" is the second season premiere episode of the original 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. This 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.