"The Infinite Vulcan" is the seventh episode of the first season of the American animated science fiction television series '. It first aired on NBC on October 20, 1973, and was written by ' 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 budgetary limitations. With "The Infinite Vulcan", Koenig became the first member of the "Star Trek" cast to write an episode for the franchise. As with the rest of the first season, the episode was directed by Hal Sutherland.