Yesteryear (Star Trek: The Animated Series)
| "Yesteryear" | |
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| Star Trek: The Animated Series episode | |
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Sarek, Amanda and a Young Spock
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| Episode no. | Season 1 Episode 2 |
| Directed by | Hal Sutherland |
| Written by | Dorothy C. Fontana |
| Production code | 22003 |
| Original air date | September 15, 1973 |
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"Yesteryear" is the second episode of the first season of the animated science fiction television series Star Trek. It first aired in the NBC Saturday morning lineup on September 15, 1973, and was written by veteran Star Trek writer D. C. Fontana. "Yesteryear" marked the return of actor Mark Lenard to the role of Spock's father, Sarek.
In this episode, Enterprise First Officer Spock must travel in time to his childhood and keep his younger self from dying and being replaced by an Andorian on his ship.
On stardate 5373.4, Captain Kirk and Spock return from a time-traveling research project they have been conducting with the use of the Guardian of Forever and Starfleet historians. When they emerge from the portal, they discover that no one on board the Federation starship Enterprise recognizes Spock. Kirk and Spock are further surprised to see that an Andorian officer, Commander Thelin, has replaced Spock as first officer.
In the new timeline, history has recorded that Spock died at age 7 undergoing the Kahs-wan ordeal on Vulcan. However, Spock remembers that when he took the Kahs-wan, his life was saved by Selek - an adult relative - when a desert creature with poisonous claws called a la matya had attacked them. While Kirk and Spock were in the portal, the Guardian and historians had run a scan of recent Vulcan history. The pair quickly realize that as they were observing the birth of Orion at the time, Spock could not have been in two places at once to save himself as a child. Spock must go back through the time gate to his childhood, and save the life of the child he was. For his part, Thelin is supportive of Spock's efforts despite its consequences on his own existence and the officers respectfully wish each other long and prosperous lives in whatever circumstances the hopefully repaired timeline would put them in.
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