Dagger of the Mind

"Dagger of the Mind" is the ninth episode of the first season of the American science fiction television series Star Trek. Written by Shimon Wincelberg (under the pen name "S. Bar-David") and directed by Vincent McEveety, it first aired on November 3, 1966.

For the second season Columbo episode of the same name, see List of Columbo episodes.

"Dagger of the Mind"
Star Trek: The Original Series episode
Episode no.Season 1
Episode 9
Directed byVincent McEveety
Written byS. Bar-David
Featured musicAlexander Courage
Cinematography byJerry Finnerman
Production code011
Original air dateNovember 3, 1966 (1966-11-03)
Guest appearances
  • James Gregory – Dr. Tristan Adams
  • Morgan Woodward – Dr. Simon van Gelder
  • Marianna Hill – Dr. Helen Noel
  • Larry Anthony – Mr. Berkley (credited as Transportation Man)
  • Susanne Wasson – Lethe
  • John Arndt – Fields (credited as First Crewman)
  • Eli Behar – Therapist Eli
  • Ed McCready – Inmate
  • Lou Elias – Therapist Guard
  • Eddie Paskey – Lt. Leslie
  • Frank da Vinci – Vinci
  • Irene Sale

In the episode, the Enterprise visits a rehabilitation facility for the criminally insane where the chief doctor has been using a device which destroys the human mind.

This episode introduces the Vulcan mind meld.

The title is taken from a soliloquy by the title character in William Shakespeare's play Macbeth.

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