Watch Star Trek: The Original Series (Remastered) Season 1 Episode 9: Dagger of the Mind - Full show on CBS All Access

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Star Trek: The Original Series (Remastered)

Dagger of the Mind |S1 E9| 50:29

A new treatment for the criminally insane has deadly results

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Star Trek: The Original Series (Remastered)

Dagger of the Mind

Air date: 11/03/66