A freak transporter accident strands Kirk, Scotty, McCoy, and Uhura in an alternate reality.
| Air Date | 06 October 1967 |
| Production Number | 60339 |
| Stardate | Unknown (approximately 3472.4) |
| Gregorian Calendar Date | Wednesday, 26 December 05:25:18 GMT Wednesday, 26 December 10:26:59 GMT |
| Primary Arc | The Mirror Universe |
| Secondary Arc | The Multiverse |
| Tertiary Arc | Duplicates |
| See It or Skip It | See It! |
| Previously on Star Trek | Order | Next Time on Star Trek |
|---|---|---|
| Who Mourns for Adonais? | Chronological | The Deadly Years |
| The Changeling | Air Date | The Apple |
| The Apple | Production | The Deadly Years |
| What’s Past Is Prologue | Primary Arc | The Tholian Web |
| The Alternative Factor | Secondary Arc | The Magicks of Megas-Tu |
| What Are Little Girls Made Of? | Tertiary Arc | The Infinite Vulcan |
Stardate Sidebar: Based on the production order and broadcast order, the episode must occur between “Who Mourns for Adonais?” and “The Deadly Years.” Since there is two days between stardates of these episodes, “Mirror, Mirror” must occur on 27 December 2266, and since negotiations with the Halkans are already underway at the start of the episode, we can reasonably assume that the crew began talks in the morning (ship’s time) and can approximate the stardate as 3472.4.
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