With Capt. Kirk and the derelict USS Defiant apparently lost, the Enterprise grapples with an insanity causing plague and an attack by the Tholians.


Herb Wallerstein


Gene Roddenberry (created by), Judy Burns | 2 more credits »





Episode complete credited cast:
William Shatner ... Capt. Kirk
Leonard Nimoy ... Mr. Spock
DeForest Kelley ... Dr. McCoy
James Doohan ... Scott
George Takei ... Sulu
Walter Koenig ... Chekov
Nichelle Nichols ... Uhura
Majel Barrett ... Nurse Chapel
Sean Morgan Sean Morgan ... Lt. O'Neil


Kirk and the derelict starship Defiant vanish into a spatial interphase between universes. To rescue him, Spock must maintain position despite a growing, violent hysteria aboard the Enterprise, like that which destroyed the Defiant's crew, as well as a force field being laid around the Enterprise by Tholian patrol ships. Written by Tom D.

Plot Summary | Add Synopsis


TV-PG | See all certifications »

Did You Know?


No insignia was created for the Defiant crew's tunics; however, in creating Star Trek: Enterprise: In a Mirror, Darkly (2005)/Star Trek: Enterprise: In a Mirror, Darkly, Part II (2005), the wardrobe department came up with something new: "a variation on the standard Starfleet arrowhead, tilting it and adding an extra angle to its shape." In the original, some Defiant crew members may be seen wearing the Enterprise assignment badge. See more »


When the Defiant is seen on the main view screen, Spock reports that it isn't indicated by any of the sensors on the Enterprise. He says; "Our sensors indicate it is not there." However this is wrong as the inability to detect something does not prove its absence. Spock should have said; "Our sensors do not indicate anything there." See more »


Mr. Spock: [at being fired upon after an hour and fifty-three minutes] The renowned Tholian punctuality.
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Alternate Versions

Special Enhanced version Digitally Remastered with new exterior shots and remade opening theme song See more »


Referenced in Futurama: Teenage Mutant Leela's Hurdles (2003) See more »


Music credited to Alexander Courage, although it strongly resembles the main title music for 'Hollow Triumph (1948)' by Sol Kaplan
Sung by Loulie Jean Norman
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User Reviews

Space madness and the Tholians
7 August 2019 | by bkoganbingSee all my reviews

The Enterprise is out looking for the lost starship Defiant and they find it with crew all dead and dead violently. Space itself is breaking down and the Enterprise starts to feel the same effects.

William Shatner led an away team to the Defiant, but when the rest beam back, Kirk is left just as the Defiant disappears. So with oxygen space suit he's only got hours left wherever he is.

At that point a nasty group of aliens called Tholians tell the Enterprise now commanded by Leonard Nimoy to get out of their space. Two Tholian ships start weaving a spider's web like structure to hold the Enterprise.

This episode is good because of the inherent conflict between Spock and Dr. McCoy. Usually that's mediated by Captain Kirk, but he's not there at the moment and Leonard Nimoy might just get permanent command of the Enterprise. The scenes with Nimoy and DeForest Kelley crackle more than usual here.

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Release Date:

15 November 1968 (USA) See more »

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