The Original Series: Season 1 (1966-1967)
S01E21

Tomorrow Is Yesterday

Stardate: 3113.2 Year: 2267

The Enterprise accidentally travels back in time to 1969.

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Broadcast: 26 January 1967
Format: Episode Prod #: 021
Writer(s): D. C. Fontana
Director(s): Michael O'Herlihy
Story Order: 189 | Correct Order: 22