Upon his return from a journey through the Guardian of Forever Kirk realizes that history has been altered and no one remembers Spock. An Andorian is now his First Officer and it appears that Spock met an untimely death during a childhood ritual on Vulcan. Spock must use the Guardian again and return to the Vulcan of his youth and restore his time line. Written by
Did You Know?
When this series premiered, George Takei
was running for Los Angeles city council at the time. His opponents protested that airing any episode with Takei would violate the equal time law which states that political opponents must have equal time on television. So although it is the second episode, in Los Angeles, this episode was aired first, before Star Trek: The Animated Series: Beyond the Farthest Star
(1973), because Takei does not appear in it. See more
Commander Thelin's collar is black but is blue in some shots during the meeting in the briefing room. See more
If that was supposed to be a joke, Spock, I have to remind you Vulcans don't tell jokes.
Times change, Doctor. Times change.