"The Infinite Vulcan" is the seventh episode of the first season of the American animated science fiction television series Star Trek: The Animated Series. It first aired on NBC on October 20, 1973, and was written by Original Series cast member Walter Koenig. It was the actor's only involvement in the series, as he had not been hired to voice Pavel Chekov in the animated version due to financial issues with production. With "The Infinite Vulcan", Koenig became the first member of the Star Trek cast to write an episode for the franchise. As with many episodes of the show, the episode was directed by Hal Sutherland.