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 Animated Series into its library section, clarifying, finally, that the animated series is part of the "Star Trek" canon. Both David Gerrold and D. C. Fontana have stated that the animated series is essentially the fourth season that fans wanted originally. "Star Trek: The Animated Series" was named the 96th best animated series by IGN. They declared that although the series suffered from technical limitations, its format allowed the writers far greater freedom and creativity than was possible in the original live-action series. The comic "Star Trek vs Transformers" was inspired by the animated series, and takes place in a similar universe.