An apparently insane Capt. Kirk has the Enterprise deliberately enter the Romulan Neutral Zone where the ship is immediately captured by the enemy.


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Episode complete credited cast:
Richard Compton ...
Technical Officer
Robert Gentile ...
Mike Howden ...
Romulan Guard
Gordon Coffey ...
Romulan Soldier


The Enterprise deliberately crosses the Neutral Zone, on Kirk's orders, into Romulan space and is promptly surrounded by Romulan warships, each equipped with a "cloaking device" that renders it undetectable. Spock betrays the apparently irrational and paranoid Kirk to the Romulan commander, a woman who is obviously attracted to Spock. A deadly game between Kirk, Spock and the Romulans risks not only the Enterprise but the tenuous cease-fire between the Romulans and the Federation. Written by Tom D.

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Release Date:

27 September 1968 (USA)  »

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Aspect Ratio:

1.33 : 1
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Did You Know?


First broadcast episode of Star Trek (1966): The Original Series to feature the D7 Klingon battle cruisers. Although the episode Star Trek: Elaan of Troyius (1968) was produced 3 months before this episode, and technically the first to feature the D7s, this episode was aired on TV first, since NBC changed the airing order for all the episodes. For the Remastered series in 2006, digital shots of the D7s were inserted into scenes in the episode Star Trek: Errand of Mercy (1967), which now officially makes that episode to be the first to have the D7s. See more »


The Enterprise crew are shocked to learn that their surprise capture may be due to a new cloaking technology possessed by the Romulans. Kirk and crew already encountered cloaked Romulans two years earlier in Star Trek: Balance of Terror. However, the cloaking technology in Star Trek: The Enterprise Incident is new because it is improved. The Enterprise was still able to track a Romulan ship, though not accurately, in "Balance of Terror" and cannot detect them at all with this improved version. See more »


[first lines]
Dr. McCoy: [voice-over] Enterprise Medical Log, stardate 5027.3, Dr. Leonard McCoy recording. I'm concerned about Captain Kirk. He shows indications of increasing tension and emotional stress.
Chekov: I have completed the assignment, Captain: a theoretical incursion...
Captain James T. Kirk: Yes, Mr. Chekov, I can read, and as usual, your theoretical evaluations do not tally with mine. Return to your duty, and I'll let you know when your work is satisfactory. Mr. Spock, full sensor scan on the region, please.
Spock: I did give a ...
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User Reviews

One the Best and Meatiest Episodes of the Original Star Trek
23 August 2015 | by (Oakland, CA) – See all my reviews

Has Captain Kirk (William Shatner) not only lost his ability to captain his ship but lost his mind? At episode's beginning, Captain Kirk is irritable, irrational, and nearly insufferable. And then he takes the Enterprise into the so-called "Neutral Zone", an area of the galaxy which is off-limits to Federation fleet ships under current treaty with the Romulans, the nemesis of the galaxy. The Neutral Zone acts as an interstellar buffer between the Federation and the Romulan Empire. Kirk violates the treaty and is immediately confronted by Romulan military starships.

Their commander is a beautiful but highly intelligent Romulan woman, simply called "Commander" (Joanne Linville). She is aware of the violation of the treaty and will not let the Enterprise return to Federation space without making a point. She desires to take the Enterprise and crew hostage, and to execute Captain Kirk as an example to other wayward starship captains. She then finds a strange ally in Mr. Spock (Leonard Nimoy) who, after beaming to the Romulan ship with Kirk, confirms that Captain Kirk is suffering from delusion and insanity. An unexpected subdued flirtation evolves between the Vulcan and the Romulan. Both Nimoy and Linville play their rolls perfectly, subtly engaging but never overt. Captain Kirk appears to become more infuriated when the Vulcan appears to have betrayed both him and the Federation.

This is one of the best episodes from the original Star Trek series of the 1960's. It exploits the rivalry of the Romulans and the Federation, and it has some of the best acting of William Shatner and Leonard Nimoy combined with a compelling and unpredictable storyline. Highest marks also for Joanne Linville as the Romulan Commander who never raises her voice, even when she condemns Captain Kirk to death.

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