1-29: Operation: Annihilate!
A planet, home to Kirk's brother and nephew, is under attack by unique creatures.
1-26: Errand of Mercy
Kirk and Spock try to protect a seemingly primitive species from a Klingon invasion.
1-05: The Enemy Within
A transporter malfunction creates two distinctly opposite Kirks.
1-23: A Taste of Armageddon
Enterprise encounters a species fighting a deadly war with computers.