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 and the Vulcan salute, as well as a re-airing of the TOS episode "Space Seed". <onlyinclude> </onlyinclude> The show's theme tune, immediately recognizable by many, was written by Alexander Courage, and has been featured in several "Star Trek" spin-off episodes and motion pictures. Gene Roddenberry subsequently wrote a set of accompanying lyrics, even though the lyrics were never used in the series, nor did Roddenberry ever intend them to be; this allowed him to claim co-composer credit and hence 50% of the theme's performance royalties. Courage considered Roddenberry's actions, while entirely legal, to be unethical. Series producer Robert Justman noted