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“Dagger of the Mind” first aired on November 3, 1966, and nearly 60 years later, it remains one of Star Trek's earliest and most unsettling examinations of power, control, and the danger of letting others decide who you should be.
The episode is uneven, but Dr. Van Gelder's terror, the neural neutralizer, and the franchise's first Vulcan mind meld make it essential early Trek. With that in mind, the following are five reasons "Dagger of the Mind" is still worth watching today.
