The Federation orders the Enterprise to Ardana to obtain a rare mineral to stop a plague on Merak II.
| Air Date | 28 February 1969 |
| Production Number | 60043-74 |
| Stardate | 5818.4 |
| Gregorian Calendar Date | Sunday, 19 April 2268 23:28:25 GMT Monday, 20 April 2268 06:52:10 GMT |
| Primary Arc | Final Frontier |
| Secondary Arc | n/a |
| Tertiary Arc | n/a |
| See It or Skip It | Skip It… |
| Previously on Star Trek | Order | Next Time on Star Trek |
|---|---|---|
| Plato’s Stepchildren | Chronological | The Way to Eden |
| The Way to Eden | Air Date | The Savage Curtain |
| The Lights of Zetar | Production | The Way to Eden |
| Let That Be Your Last Battlefield | Primary Arc | The Savage Curtain |
| n/a | Secondary Arc | n/a |
| n/a | Tertiary Arc | n/a |
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