Kirk, Bones, Rand, and McCoy end up trapped on another Earth, only this one has been devastated by a genetically engineered plague that kills all the adults.
| Air Date | 27 October 1966 |
| Production Number | 6149-11 |
| Stardate | 2713.5 |
| Gregorian Calendar Date | Monday, 23 July 2266 04:51:02 GMT Saturday, 28 July 2266 00:25:30 GMT |
| Primary Arc | The Prime Directive |
| Secondary Arc | Duplicates |
| Tertiary Arc | Bad Medicine |
| See It or Skip It | Skip It… |
| Previously on Star Trek | Order | Next Time on Star Trek |
|---|---|---|
| What Are Little Girls Made Of? | Chronological | Dagger of the Mind |
| What Are Little Girls Made Of? | Air Date | Dagger of the Mind |
| Dagger of the Mind | Production | The Conscience of the King |
| New Eden | Primary Arc | Errand of Mercy |
| What Are Little Girls Made Of? | Secondary Arc | Mirror, Mirror |
| n/a | Tertiary Arc | The Conscience of the King |
Shirtless Sidebar: the least appealing torn-shirt Kirk episode of the season.
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