Real World article
(written from a Production point of view)

The Enterprise battles a Romulan ship suspected of destroying outposts near the Neutral Zone.

Summary Edit

Teaser Edit

Martine-Tomlinson wedding

A wedding aboard the Enterprise

Despite indications that Earth Outposts 2 and 3 have disappeared, Captain James T. Kirk is officiating at a wedding between two crew members, Angela Martine and Robert Tomlinson. Everyone is all smiles when suddenly a klaxon interrupts the ceremony, including an announcement from Sulu for red alert and Captain Kirk to report to the bridge. Outpost 4 is under attack and the wedding ceremony is cut short as everyone runs to battle stations.

Act OneEdit

The USS Enterprise investigates in the vicinity of the Romulan Neutral Zone, where an unknown assailant is methodically destroying each of the Earth outposts bordering the Neutral Zone. Spock explains that the Romulan Neutral Zone was put into place after the Earth-Romulan War over a century ago. Neither race has had contact with the other since that time. One hundred years ago there were not even two-way visual communications, so neither side knows what the other looks like. Kirk then tells the crew that while defense is permitted, any act of aggression by the Federation would be considered an act of war by the Romulans. Starfleet Command's orders are that if the situation becomes a choice between their survival or provoking a full-scale war with the Romulans, the Enterprise and its crew are to be considered expendable.

Lieutenant Stiles is willing to intercept and attack Romulan vessels, but after a century, no one even knows what a Romulan ship looks like. Stiles shares his knowledge of (and prejudice against) Romulans, since a number of his relatives died in the Earth-Romulan war a century ago. "Their war, Mr. Stiles," says Kirk. "Not yours."

Earth Outposts 2 and 3 are found to be destroyed, and the Enterprise briefly contacts Outpost 4. The sole survivor of Outpost 4, Commander Hansen, describes a powerful blast of energy from a ship they couldn't track, taking out Outposts 2, 3, and 8. Hansen reports that the ship is making another pass at them – and the viewing screen goes blank.

Spock tries to track the unknown ship but cannot pinpoint its location. He theorizes that the Romulans have some form of invisibility shield. Since the Romulan ship is moving around in a leisurely manner, Kirk theorizes that ship may not be aware of the Enterprise. Spock also reports that the ship is heading back towards the Romulan Neutral Zone, towards home.

Despite objections from Stiles, Kirk orders a parallel course instead of an intercept course. By matching the unknown ship's course and speed, he hopes to make the Enterprise seem like an echo. Under no circumstances is the Enterprise to enter into the Romulan Neutral Zone without a direct order from Kirk. Stiles shocks everyone by declaring there could be Romulan spies on board the Enterprise. Kirk gives the order to maintain a security alert following a recommendation from Sulu.

Uhura picks up a communication signal. Spock is able to tie into the Romulan ship and the Enterprise crew get their first look at the Romulans. Stiles notices the Romulan's physical resemblance to Spock by looking back accusingly at the Vulcan.

Act TwoEdit

Attempts to interpret the Romulan signals are hampered by Stiles, who says Spock should have no trouble with decrypting them. Kirk tells him that he hopes Stiles refers to Spock's skill at decryption and orders him, "Leave any bigotry in your quarters; there's no room for it on the bridge."

Sulu, Kirk and Scott, 2266

"Stay with him, helm."

Meanwhile, on the bridge of the Romulan ship, the Romulan commander has noticed the Enterprise following them. He confers with someone known as the centurion, much as Kirk would confer with another officer on the ethics of their mission; exposing the weakness of the Federation while risking interplanetary war. A Romulan officer named Decius reports to the commander as ordered. The commander rebukes Decius for his carelessness in dispatching a coded subspace message, violating orders for radio silence. The commander reduces Decius two steps in rank and dismisses him. His trusted centurion warns the commander that Decius has powerful friends who could be dangerous and that he should be careful. The Romulan captain quietly expresses distaste for the mission to the centurion, mirroring Kirk and Spock. The Romulan captain believes it is only a politically motivated attack, but they are Romulan officers, and they will complete their mission, come what may.

James Kirk embraces Janice Rand

During a Romulan attack, Rand and Kirk brace for the impact of a plasma torpedo.

Kirk holds a conference and Scott and Spock show how the outpost's protective shields, made from cast rodinium – the hardest substance known to Federation science – were reduced to crumbling by the unknown Romulan weapon. Scott reports that the Romulan ship has no warp power, only impulse. Stiles declares that the Enterprise has to attack. Since the Romulan ship is on the Federation side of the Romulan Neutral Zone, there would be no doubt that the Romulans broke the treaty. Stiles claims that running would only guarantee war, and his bigotry emerges in his arguments as he claims that the Romulans would attack with full force. Stiles also openly accuses Spock of being an "expert" on Romulans and purposely hiding that fact from the rest of the crew.

Spock agrees with Stiles in that if the Romulans are indeed an offshoot of the Vulcan people who have not learned to choose logic over emotions, they are more dangerous than Kirk realizes and that attacking is the logical choice. After a moment, Kirk gives the order to attack. The Enterprise heads into battle at red alert.

Act ThreeEdit

Kirk in Enterprise command chair

Kirk orders the Enterprise crew to attack the Romulans

Following the Romulan ship's path into a comet's tail, Kirk orders the Enterprise to jump forward and intercept the Romulan ship on the other side. The Romulan commander gives the order for his ship to double back to intercept the Enterprise. Each ship fails to intercept the other and both commanders reflect on the other's intelligence.

A barrage of phaser fire damages the Romulan ship. The centurion pushes the Romulan commander out of the way of falling debris but is fatally injured himself. Meanwhile, the phaser circuits on the Enterprise burn out as the Romulan ship fires its primary weapon. Kirk orders full astern and as the Enterprise backs up, they find that the weapon has a range limit which causes the shot to partially dissipate, resulting in reduced impact.

Determined to prevent the Romulan ship from reentering the Neutral Zone, Kirk orders another barrage of phaser fire. Unable to stop the Romulan ship, and aware of the consequences, Kirk orders the Enterprise into the Neutral Zone. Displaying restrained emotion as his friend dies, the Romulan commander orders all debris and, sadly, the body of his friend into the escape chute as a decoy. The Enterprise picks up the debris on the sensors but in doing so, loses track of the Romulan ship.

Act FourEdit

McCoy counsels Kirk

McCoy counsels Kirk

It has come down to a waiting game and both ships have powered down in the Neutral Zone to prevent detection. After the Enterprise has been powered down for 9 hours and 47 minutes, Kirk tries to rest in his quarters when Yeoman Rand enters and asks the captain if he would like something to eat from the galley. Kirk shakes his head and tells Rand to get him coffee and have it on the bridge, as he will be heading up there soon. Just then, Dr. McCoy arrives as Rand leaves. Kirk confesses that he wishes he were on a cruise somewhere with no responsibility. He admits to McCoy that when his crew looks to him to make the next move, he wonders, "What if I'm wrong?" McCoy struggles at first to come up with an answer to this and Kirk does not expect him to provide one. However, McCoy puts his hand on Kirk's shoulder and gently says, "In this galaxy, there's a mathematical probability of three million Earth-type planets. And in all the universe, three million million galaxies like this. And in all of that, and perhaps more, only one of each of us. Don't destroy the one named Kirk."

Later on the bridge, Spock, while making repairs, accidentally activates a panel, and the Romulan ship detects the Enterprise and moves in to attack. Kirk anticipates this and manages to fire on the Romulan ship. Furious, the Romulan commander orders more debris into the disposal tubes, including a nuclear warhead.

Spock picks up the "metal-cased object" on his sensors and the Enterprise fires upon it. The massive explosion causes damage to the Enterprise but despite now having the upper hand, the Romulan commander decides to head for home.

Scott reports that while phasers are operational, only Tomlinson, the groom from the wedding, is manning the station. Stiles quotes his experience with phasers and Kirk sends him down to assist. In an attempt to lure the Romulan ship back, the Enterprise plays dead.

Despite his reservations, and the crippled status of his ship, the Romulan commander is reminded by Decius that it is the commander's duty to crush the enemy. The commander then reluctantly gives the order to attack.

Meanwhile, Spock checks on the phaser crew and Stiles coldly remarks that they "will handle things without your help, Vulcan." After Spock leaves however, a phaser coolant leak erupts. As the Romulan ship moves in to attack, Kirk gives the order to fire phasers. But both Tomlinson and Stiles have been overcome by the coolant fumes. Realizing the danger, Spock runs back and manages to fire the phasers in time, severely damaging the Romulan ship.

Visual contact between ships is somehow established as Kirk watches a severely wounded Romulan commander stagger to his feet. The Romulan commander turns and looks upon Kirk's face. Despite Kirk's offer to beam aboard any survivors, the Romulan commander informs him that it is not the Romulan way. He then says, with admiration, "I regret that we meet in this way. You and I are of a kind. In a different reality, I could have called you friend," and as the last part of his duty, he sets the Romulan ship to self-destruct. Kirk watches regretfully as the ship is destroyed.

Kirk goes to sickbay and discovers that not only did Spock fire the phasers, he also rescued Stiles. Stiles is humbled and amazed that Spock saved his life after everything he had said to him. Unfortunately, Spock was unable to save Robert Tomlinson. Kirk is then forced to console his grief-stricken fiancée, Angela Martine, while she stands alone in the chapel. "It never makes any sense. We both have to know that there was a reason," Kirk says softly to Martine. She tearfully assures the captain that she will be fine and leaves.

Log entries Edit

  • "Captain's log, stardate 1709.2. Patrolling outpost guarding the neutral zone between planets Romulus and Remus and the rest of the galaxy; received an emergency call from Outpost 4. The USS Enterprise is moving to investigate and assist."
  • "Captain's log, stardate 1709.6. We are at the neutral zone. I've lost contact with the intruder. No reaction on our motion sensors, but believe the Romulan vessel to be somewhere close by, with all engines and systems shut down. The Enterprise is also playing this silent waiting game in hope of regaining contact."
  • "Captain's log, supplemental: Now motionless for 9 hours 47 minutes."

Memorable quotes Edit

Stiles, Kirk & Scott

Stiles, Kirk, and Scott

"Since the days of the first wooden vessels, all ship masters have had one happy privilege: that of uniting two people in the bonds of matrimony."

- Kirk, in the chapel

"I had no idea that history was your specialty."
"Family history."

- Kirk and Stiles, on the Romulan War

"Their war, Mister Stiles. Not yours."

- Kirk, after Stiles lists his family losses in the Romulan War

"Happy wedding day, almost."
"You won't get off my hook this easily. I'm going to marry you, Mister. Battle or phaser weapons notwithstanding."

- Tomlinson and Angela, in the phaser control room

Romulan commander and Centurian

On board the Romulan vessel

"Leave any bigotry in your quarters. There's no room for it on the bridge."

- Kirk, to Stiles, after he implies that Spock could be a Romulan spy

"That Earth outpost sent word to an Earth vessel, now it follows."
"Which neither retreats nor grows near, which turns as we turn. Commander, it is our judgment that we run from a reflection."
"Perhaps so, but my judgment prevails."

- Romulan commander and Romulan bridge officer

"He has friends. And friends of his kind mean power. And power is danger."
"Danger and I are old companions."

- Romulan centurion and Romulan commander, after Decius is demoted in rank

"Not too soon for me to see the stars of home."

- Romulan commander, to the centurion

"War is never imperative, Mister Spock."

- McCoy, after Spock agrees with Stiles on attacking the Romulans

"It is for them, doctor. Vulcan, like Earth, had its aggressive, colonizing period; savage, even by Earth standards. And if the Romulans retained this martial philosophy, then weakness is something we dare not show."

- Spock, responding to McCoy

"I wish I were on a long sea voyage somewhere. Not too much deck tennis, no frantic dancing. And no responsibility."

- Kirk to McCoy, on the Romulan incursion
Janice alone with the Captain

While Kirk rests in his quarters, Rand enters to check up on him.

"In this galaxy, there's a mathematical probability of three million earth-type planets... and in all the universe, three million million galaxies like this one. And in all of that, and perhaps more, only one of each of us. Don't destroy the one named Kirk."

- McCoy's advice to Kirk

"He's a sorcerer, that one! He reads the thoughts in my brain!"

- Romulan commander to Decius, on Kirk

"You and I are of a kind. In a different reality, I could have called you friend."

- Romulan commander to Kirk, after the Romulan ship is disabled

Martine & Kirk

Angela Martine in the ship's chapel

"We are creatures of duty, captain. I have lived my life by it. Just one more duty to perform."

- Romulan commander's last words

"It never makes any sense. We both have to know that there was a reason."

- Kirk to Martine, on Tomlinson's death

Background information Edit

Story and scriptEdit

  • The plot of this episode is based on the 1957 movie The Enemy Below, with the Enterprise taking the part of the American destroyer and the Bird-of-Prey with its cloaking device taking the part of the submarine. (The Star Trek Compendium 4th ed., p. 40) Director Vincent McEveety had seen the film but only noticed the similarity later, when this was pointed out to him. He commented, "Obviously, it's the same story." (Captains' Logs: The Unauthorized Complete Trek Voyages, p. 34)
  • According to Harlan Ellison, when Paul Schneider told him he had adapted The Enemy Below for television, Ellison then refused to speak to him.(citation needededit)
  • Star Trek: The Original Series 365 suggests that Schneider may have also been inspired by another submarine film, Run Silent, Run Deep. The authors note that the film contains a similar plot thread of an officer longing for vengeance, as well as the tactic of releasing wreckage and bodies from a damaged vessel in order to mislead the opposing ship. (p. 063). The Star Trek Compendium also mentions this film as the inspiration along with The Enemy Below. (5th edition, p. 40)
  • A long portion of the scene with the doomed Commander Hansen was cut from the final episode. Hansen informed Kirk that the Romulan vessel is of "starship design" which is "remarkably similar to ours", and that the Romulans had probably stolen Earth designs via espionage and traitors. This is the basis for Stiles' remarks about having Romulan spies aboard the Enterprise. [1]
  • A shot filmed, but cut from the finished episode shows Kirk saluting the Romulan commander before he destroyed his ship. [2]


  • The music featured during the opening scenes of the wedding ceremony is the 19th century English tune "Long, Long Ago."
  • Although phasers are used throughout the episode, the visual effect seen is that which later was used for photon torpedo launches, probably because the term "photon torpedo" was not invented until later in the season, in "Arena". Kirk orders the phasers to be "set for proximity blast"; each phaser blast acts like a Navy depth charge.
  • The Making of Star Trek and The Star Trek Compendium (4th ed., p. 40) state that the ship's chapel was a redress of the transporter room. Inside Star Trek: The Real Story (pp. 170-171), states that it is instead a redress of the briefing room.



  • The Romulan helmets shown aboard the Romulan bridge were designed to cover the ears of the actors. This saved the additional cost of creating prosthetic ear-points for each of the supporting actors. They were reused in "Amok Time" (on Vulcans) and "The Enterprise Incident" for the same reason. (Star Trek: The Original Series 365, p. 173)
  • The rarely seen Command work utility jumpsuit is worn by several crew members in this episode.


  • This episode saw the introduction of the Romulan Star Empire in Star Trek. Paul Schneider is credited with creating the Romulans. Schneider remarked, "It was a matter of developing a good Romanesque set of admirable antagonists that were worthy of Kirk. I came up with the concept of the Romulans which was an extension of the Roman civilization to the point of space travel, and it turned out quite well." (Captains' Logs: The Unauthorized Complete Trek Voyages, p. 34) Schneider's next contribution was "The Squire of Gothos".
  • Associate producer / story editor John D.F. Black said about Schneider, "He was the father of the Romulans. Not Gene, not me, not anyone else - but Paul Schneider. And when he came up with the Romulan characters, they were so wonderful - I mean, they were full. I liked that script a lot." (These Are the Voyages: TOS Season One, p. 217)
  • This is the only time in which the ship's weaponry is fired through a chain of commands (Kirk, to Stiles, to phaser room), although "The Corbomite Maneuver" comes close with Bailey's phaser drills.
  • Regular first-season extra Ron Veto gets his only close-up in TOS, when he replaces Stiles at the navigation console.
  • The preview trailer gives the stardate for this episode as 1710.0.
  • The trailer includes footage of the Enterprise firing its phasers from "The Corbomite Maneuver" instead of the "blast-like" phaser effect seen in the actual episode.
  • As an homage, Captain Picard's wedding remarks in TNG: "Data's Day" are almost the same as those Kirk uses. (Star Trek: The Next Generation Companion)
  • When Kirk requests communication with the Romulan flagship, Uhura opens a hailing frequency from the navigation console, which seems unusual. However, when she left the communications station, Uhura had shut down most of the light indicators, which could indicate a transfer of functionality to the navigator's position. This is not the first time the navigation console has been used to open communications. In "The Cage" and "Where No Man Has Gone Before", when Captain Christopher Pike and Captain Kirk, respectively, want to "address intercraft," the system is opened from the navigation console. This apparently is also true in the alternate reality, because in Star Trek, Pavel Chekov is able to address the crew of the USS Enterprise from his position at navigation.


  • McEveety recalled, "[Kirk and the Romulan commander] were very heroic characters pitted one against the other, and it dealt with the length to which people would go for their honor. It was a morality fantasy play, but terribly gripping. I thought that Mark Lenard's performance was brilliant, as was Bill Shatner's. It was a two-people show that I felt was real strong." (Captains' Logs: The Unauthorized Complete Trek Voyages, p. 34)
  • Mark Lenard said, "The Romulan Commander was one of the best roles I ever had on TV". Comparing the part with that of Sarek, Lenard elaborated, "In many ways, I did enjoy that role [Sarek], but I think the more demanding role and the better acting role was the Romulan Commander". (These Are the Voyages: TOS Season One, p. 217)
  • Gene Roddenberry picked this as one of his ten favorite episodes for the franchise's 25th anniversary. (TV GuideAugust 31, 1991)


  • In the James Blish adaptation of this story, presumably based on an earlier draft of the script, Stiles dies. In addition, Robert Tomlinson and Angela Martine actually marry, in a second ceremony late in the story. When the Enterprise fires on the Romulan ship for the final time, the latter explodes immediately, with the conversation between Kirk and the Romulan commander being omitted.
  • In the William Shatner novel The Return, where Kirk is resurrected by a Borg/Romulan alliance to kill Captain Jean-Luc Picard, the Romulan alliance is arranged by the granddaughter of the Romulan commander of this mission, convinced that Starfleet are brutal murderers and seeking revenge for her grandfather's death at Kirk's hands.
  • The story of the events on Romulus leading up to this episode are told in the comic book "Alien Spotlight: Romulans".
  • In the novel Headlong Flight, an experiment in dimensional displacement results in the USS Enterprise-E of the 'prime' universe- over a decade after Star Trek Nemesis- encountering both an alternate version of the USS Enterprise-D- from a year after the Battle of Wolf 359, in a timeline which ended with the death of Picard/Locutus of Borg- and a trio of Romulan ships from this era, in a timeline where the Romulan ship depicted here apparently destroyed Kirk's Enterprise in the final showdown.

Remastered information Edit

  • "Balance of Terror" was the first episode of the remastered version of The Original Series to air, though in some markets it was preceded by "Miri". It premiered in syndication on the weekend 16 September 2006 and most notably featured new effects shots of the comet, Romulan plasma torpedo, and Bird-of-Prey, as well as of the Enterprise and Bird-of-Prey "adrift".
The next remastered to air was "Miri".

Production timeline Edit

Video and DVD releases Edit

Links and references Edit

Starring Edit

Also starring Edit

Co-starring Edit

Featuring Edit


Uncredited co-stars Edit

Stunts Edit


References Edit

2156; 2160; Achilles' heel; Amen; asteroid; atomic weapon; battle stations; bearing; best man; bigotry; blip; book; "Bones"; briefing room; candelabra; casting; centurion; chapel; cloaking system; code; coffee; Command Base; comet; condition red; control circuit; couch; Cryptography; cycle; damage report; debris; decode; deflector shield; disposal tube; Earth; Earth Outpost Station; Earth-Romulan War; emergency call; escape maneuver one; evasive maneuvers; flagship; fuel; fuel reserve; Galaxy Quadrant YX-12-114; heading; "Here Comes the Bride" (aka "Bridal Chorus"); Icarus IV; impulse; interception course; invisibility screen; iron; junior officer; lab; lectern; magnitude; master; match; matrimony; maximum warp; meter; mile; Milky Way Galaxy; mister; motion sensor; Neutral Zone Incursion; nuclear warhead; outpost station; Outpost 1; Outpost 2; Outpost 3; Outpost 4; Outpost 5; Outpost 6; Outpost 7; Outpost 8; parallel course; patrol; phaser control room (aka phaser room, phaser control); phaser coolant; phaser crew; philosophy; plasma; plasma torpedo; plastaform; Praetor; protective shield; proximity fuse; rank reduction; Remus; rodinium; Romii; Romulan Star Empire; Romulans; Romulan Bird-of-Prey; Romulan Neutral Zone; Romulan Praetor; Romulan system; Romulus; rule of silence; salute; Sector Z-6; security alert; shipmaster; sorcerer; space recorder; Space Service; space vessel; specialist; speaker; spy; standby alert; star sector; Stiles; Stiles family; subspace radio; superior officer; Table of Comets; tape; telepathy; television camera device; tennis; transfer coil; viewing screen; Vulcans; Vulcan (planet); Vulcan history; weapons control; weapons crew; wooden vessel

Unreferenced material Edit

bird; bull; chest pain; creature; hawk; a medicine; seat-harnesses; terrier

External links Edit

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"Charlie X"
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Previous episode aired:
"The Conscience of the King"
Next episode aired:
"Shore Leave"
Previous remastered episode aired:
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