Watch Star Trek: The Original Series (Remastered) Season 1 Episode 27: The Alternative Factor - Full show on CBS All Access

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Star Trek: The Original Series (Remastered)

The Alternative Factor |S1 E27| 50:32

An alien being fights himself across two realities.

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Star Trek: The Original Series (Remastered)

The Alternative Factor

Air date: 03/29/67