Star Trek: The Animated Series were added to the cast—claiming that Sulu and Uhura were of importance as they were proof of the ethnic diversity of the 23rd century and should not be recast. Nimoy also took this stand as a matter of principle, as he knew of the financial troubles many of his "Star Trek" co-stars were facing after cancellation of the series. Koenig was not forgotten, and later wrote an episode for the series, becoming the first "Star Trek" actor to write a "Star Trek" story. Koenig wrote "The Infinite Vulcan", which had plot elements from the original "Star Trek" episode "Space Seed"
Star Trek: The Original Series "The Original Series". Rod Serling said of the series that ""Star Trek" was again a very inconsistent show which at times sparkled with true ingenuity and pure science fiction approaches. At other times it was more carnival-like, and very much more the creature of television than the creature of a legitimate literary form." Isaac Asimov and "Star Trek" creator Gene Roddenberry developed a unique relationship during "Star Trek"s initial run in the late 1960s. Asimov wrote a critical essay on "Star Trek"s scientific accuracy for "TV Guide" magazine. Roddenberry retorted respectfully with a personal letter explaining the limitations of accuracy