Mysterious deaths of Enterprise crew on a desolate planet disrupt McCoy's unexpected reunion with an old love.
To save his ship, Kirk intervenes in a 500-year-old, computerized war between neighboring worlds; guest Barbara Babcock.
Shore leave on an idyllic world goes awry when Enterprise crew members find the fruits of their imaginations coming to life.
Only the Enterprise and the battered Constellation stand between an ancient weapon and devastation; guest William Windom.
A strange ailment which bares emotions afflicts the crew as the Enterprise observes a planet's disintegration.