1-25: The Devil in the Dark
The Enterprise encounters a silicone-based life-form who is attacking pergium miners.
1-28: The City on the Edge of Forever
After following a delusional McCoy into 1930s Earth, Kirk must make a heart-wrenching choice to save the future.
1-29: Operation: Annihilate!
A planet, home to Kirk's brother and nephew, is under attack by unique creatures.