The crew of the Enterprise discover a 20th century Roman civilization hundreds of lightyears from Earth.
| Air Date | 15 March 1968 |
| Production Number | 60343 |
| Stardate | 4040.66 |
| Gregorian Calendar Date | Tuesday, 23 April 2267 12:08:56 GMT Tuesday, 23 April 2267 17:16:33 GMT |
| Primary Arc | The Prime Directive |
| Secondary Arc | n/a |
| Tertiary Arc | n/a |
| See It or Skip It | See It! |
| Previously on Star Trek | Order | Next Time on Star Trek |
|---|---|---|
| Journey to Babel | Chronological | The Slaver Weapon |
| The Ultimate Computer | Air Date | Assignment: Earth |
| The Trouble With Tribbles | Production | Journey to Babel |
| The Apple | Primary Arc | A Private Little War |
| n/a | Secondary Arc | n/a |
| n/a | Tertiary Arc | n/a |
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