The Original Series: Season 1 (1966-1967)
S01E20

The Alternative Factor

Stardate: 3087.6 Year: 2267

While orbiting an apparently dead planet, the Enterprise seems to experience strange phenomena.

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Broadcast: 30 March 1967
Format: Episode Prod #: 020
Writer(s): Don Ingalls
Director(s): Gerd Oswald
Story Order: 188 | Correct Order: 21