We're very excited to welcome special guest William "Billy" Simpson, who played "Young Spock" in "Yesteryear."

After a trip back in time through the Guardian of Forever to observe the history of the Orion civilization, Captain Kirk and Mr. Spock return to the present to discover that not only is Spock no longer the First Officer of the Enterprise, but he has been completely erased from the current timeline. After a thorough investigation, Spock concludes that in order to restore the timeline and save his very existence, he must go back in time to save his younger self from dying during the Vulcan right-of-passage ritual known as "Kahs-Wan." If there's any episode of "The Animated Series" that truly deserves to stand alongside the very best of "The Original Series," it has to be "Yesteryear." Written by Dorothy "D.C." Fontana (who wrote some of "Star Trek's" most revered classics, including "This Side of Paradise" and "Journey to Babel"), "Yesteryear" is, quite simply, as good as "The Animated Series" ever got, thanks to a brilliant, mature and deeply moving story that dives deeper into the world-building of Vulcan culture. Oh, what an amazing live-action episode this would have been!

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