Yesteryear

When Spock and Kirk return through a time portal like the one in "The City on the Edge of Tomorrow," that many consider the best episode of the original series. When they appear, the only one who knows Spock is Kirk. When he gets to the ship, an Andorean has his job. Spock must go back in time and meet himself as a child. Something must have happened when he was a boy with a Vulcan father (Sarek) and a human mother. He must find out what the variable is and change it before he returns. This is a really good episode. I'm not nearly as caught up in the animations shortcomings because the story is engaging.