Yesteryear

Sep 15, 1973 on NBC at 12:00 AM
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Summary

While on an away mission in the Guardian of Forever, Spock is erased from the timeline.

Previous episode

Beyond the Farthest Star
Season 1 Episode 1

Sep 08, 1973

Next episode

One of Our Planets is Missing
Season 1 Episode 3

Sep 22, 1973

Guest stars

Billy Simpson, James Doohan, Keith Sutherland, Majel Barrett, Mark Lenard