!For characters who debuted in ''Star Trek: The Original Series'', see Characters.StarTrekTheOriginalSeries

!''Enterprise'' Crew
[[folder:Lieutenant Valeris]]
->'''Played by:''' Kim Cattrall

A Vulcan helm officer.

* BotheringByTheBook
* [[GreenSkinnedSpaceBabe Green Blooded Space Babe]]: {{Downplayed}} in the same way as [[Film/StarTrekIITheWrathOfKhan Lt. Saavik]]--attractive, but conservatively dressed.
* JediTruth
* KnightTemplar: She thinks she's saving the Federation by sabotaging peace talks.
* TheMole
* RememberTheNewGuy
* SuckSessor: A variation, since aside from the whole bit about being a traitor and a murderer she's actually an extremely competent officer.
* SuspiciouslySimilarSubstitute: For Lt. Saavik from films II-IV, plus Commander Xon from the unmade ''Star Trek: Phase II'' TV series, in that they're both Vulcans who are set up to succeed Spock.
* TemptingFate: She suggests serving Romulan Ale during the meal with the Klingons, which given the underlying tensions between the two peoples and the extreme strength of Romulan Ale, goes over about as well as you'd expect. Of course, this is part of a XanatosGambit to make it later look like Kirk attacked Gorkon's ship in a moment of drunken rage.

[[folder:Yeomen Burke and Samno]]
->'''Played by:''' B.J. Davis and Alan Marcus

ThoseTwoGuys who assassinate Chancellor Gorkon.

* FantasticRacism: Freely expressed when the main cast are out of earshot.
* YouHaveOutlivedYourUsefulness: Found dead after the assassination.
--> '''Kirk:''' [[AssassinsAreAlwaysBetrayed First rule of assassinations: kill the assassins.]]

[[folder:Crewman Dax]]
->'''Played by:''' Michael Snyder

A {{redshirt}} on the ''Enterprise''.

* BizarreAlienBiology: Nice feet, buddy!
* FallGuy: One of the missing mag-boots was hidden in his locker to make him look like the killer. Too bad it won't fit on those feet of his.
* NamesTheSame: No relation to [[Series/StarTrekDeepSpaceNine any of the hosts of the Dax symbiont]].

[[folder:General Chang]]
->'''Played by:''' Creator/ChristopherPlummer

A Klingon officer who is opposed to peace with the Federation.

* AffablyEvil: He is a Klingon officer vehemently against Starfleet and the architect of a conspiracy, but he respects Kirk for his valor.
* BaldOfEvil: He was supposed to have long hair, but Christopher Plummer had liked his bald appearance, so Chang became bald..
* BigBad: He fills the role of the film's main bad guy, but he's really part of a BigBadEnsemble including Admiral Cartwright, Colonel West and the Romulan Ambassador.
* ChewingTheScenery: It's not enough that he's already a LargeHam. When reciting Creator/WilliamShakespeare he proceeds to shout it at the top of his lungs and ''[[SwivelChairAntics spin in his captain's chair]]''.
--> [[https://www.youtube.com/watch?v=XSqCJ-UGYns "CRY ''HAVOC''! And let slip the dogs of war!"]]
* CulturedWarrior
* EvilCounterpart: A bald starship officer who quotes Shakespeare? [[Series/StarTrekTheNextGeneration Never heard that one before.]]
* EyepatchOfPower: Bolted onto his skull, no less.
* FaceDeathWithDignity: Upon seeing the modified torpedo approaching his ship, he quietly says "To be, or not to be..."
* IncomingHam: He has an impossible to detect ship. Rather than simply unload on the ''Enterprise'' he decides to open a channel and [[IShallTauntYou announce himself.]]
* InvisibilityFlicker: His Bird-Of-Prey briefly appears while firing its torpedoes.
* IShallTauntYou
--> I can see you, Kirk... Can you see me?
* '''LargeHam''': He quotes [[ShoutOutToShakespeare Shakespeare]] as a ''[[IShallTauntYou battle taunt.]]''
* ANaziByAnyOtherName: While dining with the ''Enterprise'' crew, he says that the Klingons need "breathing room" to survive, with Kirk immediately likening it to Adolf Hitler's calls for lebensraum prior to World War II. Chang gets the reference and is offended and only Gorkon's kindly intervention prevents an escalation.
* ObiWanMoment: When he realizes that ''Enterprise's'' torpedo is homing in on his ship, he simply waits for it while quoting Shakespeare.
* TreacherousAdvisor: To Chancellor Gorkon.
* WellIntentionedExtremist: The ''VideoGame/StarTrekKlingonAcademy'' video game gives a better, more detailed look at his motives; basically, he's an honorable conservative who genuinely fears Gorkon's moderate policies will lead their race to their doom.
* WorthyOpponent: Despite all his efforts to have Kirk framed and killed, he makes it clear that he holds him in the highest regards as a skilled and accomplished warrior. And when he gets the chance to fight Kirk in an actual battle, he finds this much better than if everything had gone according to the original plan.

[[folder:Chancellor Gorkon]]
->'''Played by:''' Creator/DavidWarner

Abraham Lincoln meets Mikhail Gorbachev [[RecycledInSpace in space]]. The intellectual and soft-spoken chancellor of the Klingons, who seeks peace with the Federation.

* DueToTheDead: ''Series/StarTrekTheNextGeneration'' reveals that Starfleet named an ''Excelsior''-class ship in his honor.
* FamousLastWords: To Captain Kirk. "Don't let it end [[ThisMeansWar this way]], Captain..."
* HonorBeforeReason: Many of his fellow Klingons were against his decision to present an olive branch to the Federation. It cost him his life.
* OurPresidentsAreDifferent: Chancellor Target and Chancellor Personable.
* ReasonableAuthorityFigure: While his hand was largely forced by the explosion of Praxis, ''Klingon Academy'' shows that he had wanted peace with the Federation before he originally became Chancellor.

[[folder:Chancellor Azetbur]]
->'''Played by:''' Rosanna [=DeSoto=]

Gorkon's daughter, who succeeds him as the Klingons' chancellor.

* JerkassHasAPoint: While her delivery is much harsher than neccesary (part of the discussion in general breaking down), her criticisms of the Federation during dinner are spot-on. Other than the president and a small minority of Starfleet officers the leadership of this supposedly multi-ethnic Federation (as shown in this movie) might as well be a human empire.
* ReasonableAuthorityFigure: Refuses to invade the Federation or cancel the peace talks in response to her father's assassination and in spite of her earlier tensions with the Federation before the aforementioned tragedy, considering it sufficient to put the alleged assassins on trial.
* [[ShutUpKirk Shut Up, Chekhov!]] / WhatTheHellHero: However, everything is on ''her'' terms, and refuses to bend her knee at the Federation.
-->'''Azetbur:''' "In''alien''able ''human'' rights." [[InhumanableAlienRights Why the very]] ''name'' is ''racist''.

[[folder:Brigadier Kerla]]
->'''Played by:''' Paul Rossilli

A high-ranking Klingon officer.

* AdaptationalVillainy: In the film he's a fairly anonymous flunky to Gorkon and then Azetbur. In the official novelization of the film and other spin-off media he's actually in on the conspiracy, and after the destruction of Chang's ship is left as its highest-ranking member, which leads to a very nasty case of DeathByAdaptation.
* BloodKnight: Tries to persuade Azetbur to declare war against the Federation.
* UndyingLoyalty: He is dedicated to Gorkon. He is also just as loyal to Azetbur and as much as he ''really'' wants a war to avenge his beloved Chancellor, he respects her authority enough to back down and keep his BloodKnight tendencies in check.

[[folder:Colonel Worf]]
->'''Played by:''' Creator/MichaelDorn

A Klingon attorney who defends Kirk and [=McCoy=] at their trial.

* [[IdenticalGrandson Identical Grandfather]]: Confirmed by WordOfGod to be the grandfather of his namesake in ''Series/StarTrekTheNextGeneration''. This, incidentally, makes Dorn one of only two people -- the other being Creator/MajelBarrett -- to appear on-screen in TOS, TNG and [=DS9=]-related works.
* OnlySaneMan: During the trial, he is one of the true reasonable Klingons and does his best to defend his clients.
* ReasonableAuthorityFigure: He retains the rank of Colonel and is a level-headed attorney whose ego is not attached to the trial unlike his fellow comrades.
* SpannerInTheWorks: He persuades the judge at Kirk and [=McCoy=]'s trial to sentence them to exile on Rura Penthe rather than giving them the death penalty. It's subtle, but you can see that Chang is ''not'' pleased by this development, and it allows Kirk to escape and foil the conspiracy.

->'''Played by:''' W. Morgan Sheppard

The officer in charge of the Rura Penthe penal colony.

* CoolAndUnusualPunishment: Literally; his favored method of executing rebellious or lazy prisoners is to have them stripped naked and thrown out onto the surface of Rura Penthe, where they freeze to death in less time than it takes for him to give his big speech to the new arrivals. It's implied that he makes a point of making a demonstration of this every time new inmates arrive.
* DeathByAdaptation:
** The film's novelization shows that Chang intends to [[YouHaveFailedMe have him executed]] for allowing Kirk and [=McCoy=] to escape, though leaves it ambiguous as to whether or not Chang actually gets around to putting this in motion before he himself is killed. In the movie he just angrily hangs up on him.
** His counterpart in the ''[[Film/StarTrek Star Trek (2009)]]'' timeline ends up predeceasing his prime reality counterpart by at least three decades, dying during Nero's escape from Rura Penthe.
* JustBetweenYouAndMe: Decides that since he's about to kill Kirk and [=McCoy=], he can afford to give away the identity of the mastermind behind the conspiracy. In a subversion, he actually gets prevented from doing this by the ''Enterprise'' crew, who beam their crew-mates aboard before he can spill the beans.

!Other Characters
[[folder:President Ra-ghoratreii]]
->'''Played by:''' Creator/KurtwoodSmith

The President of TheFederation

* AllThereInTheManual: As with [[Film/StarTrekIVTheVoyageHome his predecessor]], his name comes from source materials and not the film's dialogue. These sources also identify his species as Efrosian, who were once subjects of the Klingon Empire. In fact, it's considered significant that an Efrosian is willing to come to the Klingons' aid. In addition, he's supposed to be blind; the weird glasses he sometimes wears are actually an earlier version of [[Series/StarTrekTheNextGeneration Geordi [=LaForge=]'s VISOR]].
* ReasonableAuthorityFigure: He flatly refuses to go to war over Kirk and [=McCoy=] and proclaims that he is not above the law.
* UnexpectedSuccessor: Expanded Universe books have revealed that he won a special election to succeed Hiram Roth after Roth died in office from overwork after the Probe Crisis.