Star Trek
S01E09 Dagger of the Mind
After a deranged individual flees from the Tantalus Penal Colony, Kirk uncovers a shocking truth: the escapee is actually part of the psychiatric team. Intrigued, he delves into the workings of the facility, only to reveal a disturbing experiment involving mind control.
Season 1 Episodes
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2
3
4
5
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7
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9
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The Man Trap
Charlie X
Where No Man Has Gone Before
The Naked Time
The Enemy Within
Mudd's Women
What Are Little Girls Made Of?
Miri
Dagger of the Mind
The Corbomite Maneuver
The Menagerie (1)
The Menagerie (2)
The Conscience of the King
Balance of Terror
Shore Leave
The Galileo Seven
The Squire of Gothos
Arena
Tomorrow Is Yesterday
Court Martial
The Return of the Archons
Space Seed
A Taste of Armageddon
This Side of Paradise
The Devil in the Dark
Errand of Mercy
The Alternative Factor
The City on the Edge of Forever
Operation: Annihilate!