1-26: Errand of Mercy
Kirk and Spock try to protect a seemingly primitive species from a Klingon invasion.
On a planet resembling 1960s Earth, all of the adults have perished from a deadly disease.
1-10: The Corbomite Maneuver
The Enterprise fights against a seemingly unstoppable force.
1-07: What Are Little Girls Made Of?
The Enterprise finds Nurse Chapel's long-lost fiance, Dr. Roger Korby, living isolated with advanced androids.