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 expanded universe of these premises have been accepted by "Star Trek" fans as being canon, even though Paramount Pictures, owners of the "Star Trek" franchise, considers only live-action television and film productions to be canon. This has led to conflict on occasion when a TV episode or film contradicts well-established Expanded Universe backstory (most notably in the case of the prequel series, ""). "" ("TAS") was a 22 episode set of animated adventures of the "Enterprise" crew, which aired originally on NBC from 1973-1974. It featured the reappearance of popular characters from the original series, including Harry Mudd and Cyrano Jones, and