26 user 11 critic

Dagger of the Mind 

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.


Vincent McEveety


Shimon Wincelberg (as S. Bar-David), Gene Roddenberry (created by)




Episode complete credited cast:
William Shatner ... Capt. Kirk
Leonard Nimoy ... Mr. Spock
James Gregory ... Dr. Tristan Adams
DeForest Kelley ... Dr. McCoy
Morgan Woodward ... Dr. Simon van Gelder
Marianna Hill ... Helen Noel
Nichelle Nichols ... Uhura
Susanne Wasson Susanne Wasson ... Lethe
John Arndt John Arndt ... First Crewman
Ed McCready Ed McCready ... Inmate
Eli Behar Eli Behar ... Therapist


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


TV-PG | See all certifications »

Did You Know?


Despite looking a lot older, Morgan Woodward (who played Simon Van Gelder) was actually only 40 years old when this episode was filmed. See more »


When Van Gelder reaches the Enterprise's bridge, he attacks and disables a security guard. McCoy is on the bridge at the time, but even after Van Gelder is subdued, he never so much as glances in the unconscious guard's direction. See more »


[first lines]
crewman Berkeley: Ready to beam down... Energize!
See more »

Alternate Versions

Special Enhanced version Digitally Remastered with new exterior shots and remade opening theme song. A highlight of the new special effects is a new exterior shot of the penal colony, replacing a re-used matte painting from another episode. See more »


Referenced in Castle: Clear & Present Danger (2014) See more »


Theme From Star Trek
Written by and credited to Alexander Courage
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User Reviews

Nice to See Marianna Hill again
28 November 2006 | by prfrmrSee 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.

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Greek | English

Release Date:

3 November 1966 (USA) See more »

Also Known As:

Dagger of the Mind See more »

Company Credits

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Technical Specs


Sound Mix:

Mono | Dolby Digital (re-mastered version)| DTS (re-mastered version)


Color | Color (Technicolor)

Aspect Ratio:

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