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"
Mirror, Mirror (Star Trek: The Original Series) a Mirror, Darkly", which is a sequel to the Original Series episode "The Tholian Web", reveals the fate of the USS "Defiant". The Mirror Universe played a large role in of "" and was visited in "Despite Yourself", "The Wolf Inside", "Vaulting Ambition", and "What's Past Is Prologue". For the franchise's 30th anniversary, "TV Guide" ranked "Mirror, Mirror" No. 3 on its list of the 10 best "Star Trek" episodes from all series. Mirror, Mirror (Star Trek: The Original Series) "Mirror, Mirror" is the fourth episode of the of the American science fiction television series "". Written by Jerome Bixby