Star Trek: Season 1, Episode 9

Dagger of the Mind (3 Nov. 1966)

TV Episode  |   |  Action, Adventure, Mystery
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Ratings: 7.5/10 from 1,191 users  
Reviews: 13 user | 10 critic

Kirk and psychiatrist Helen Noel are trapped on a maximum security penal colony that experiments with mind control and Spock must use the Vulcan mind-meld to find a way to save them.



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Episode complete credited cast:
Susanne Wasson ...
John Arndt ...
Ingenieur Fields
Larry Anthony ...
Ed McCready ...
Eliezer Behar ...
Eli (as Eli Behar)


After a psychologically disturbed patient from the Tantalus penal colony, Dr. Simon Van Gelder, manages to escape to the Enterprise, Dr. McCoy begins to suspect that something is amiss on the colony. Captain Kirk and Dr. Helen Noel beam down to the planet to investigate. Written by garykmcd

Plot Summary | Plot Synopsis


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Release Date:

3 November 1966 (USA)  »

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Aspect Ratio:

1.33 : 1
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Did You Know?


The title is a line from William Shakespeare's Macbeth. It is in the title character's soliloquy in Act 2 Scene 1. See more »


When Uhura reports that the transporter officer is found unconscious she says that the box was found with the lid open. However, when the assailant leaves the box and the transporter room, the box is clearly closed. See more »


Mr. Spock: [performing a mind meld] You begin to feel a strange euphoria... your body floats...
Dr. Simon van Gelder: Yes... I began to feel it.
Mr. Spock: Open your mind; we move together... our minds sharing the same thoughts...
See more »

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User Reviews

Nice to See Marianna Hill again
28 November 2006 | by (United States) – See all my reviews

I rather liked this episode for the particularly fact that actress Hill appears in it, in a rather strong, fluctuate role as Dr. Helen Mirren; psychologist. I have always loved Marianna Hill's work, especially in many of the 60's and early 70's films and TV appearances she's endured, including co-starring with Clint Eastwood in 'High Plains Drifter'.

Hill is remarkably well-done in this one-time episode. In a few scenes she appears slightly apprehensive, almost insecure, far as her abilities as an actress. But nonetheless, she is a great screen beauty, and as fine an actress as any. I especially appreciate that Roddenberry did not subject her character -Mirren- to the typical fawn-femme typecast, as was generally typical of Star Trek women (aka: Kirk's ladies). Her character is independent, strong, and viral. She, and including in her character, holds her own throughout the episode, and displays some of the strongest of female subject, not usually common, for 1960's television.

13 of 16 people found this review helpful.  Was this review helpful to you?

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