1.09 Dagger of the Mind

Dr Simon Van Gelder "escapes" from the psychiatric team on the Tantalus Penal Colony and causes Dr. McCoy sufficient concern to demand Kirk looks into the colony's professional methods. McCoy's concerns are soon found to be warranted when Kirk is kidnapped and subjected to a deadly Neural Neutralizer.

Dagger of the Mind
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TOS Season 1, Episode 9

S. Bar-David
Vincent McEveety

First Aired Nov 3, 1966
Stardate 2715.1