!For characters who debuted in ''Star Trek: The Original Series'', see Characters.StarTrekTheOriginalSeries
->'''Played by:''' Kim Cattrall
A Vulcan helm officer.
* [[GreenSkinnedSpaceBabe Green Blooded Space Babe]]
* 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.
->'''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]]''.
--> "CRY ''HAVOC''! And let slip the dogs of war!"
* 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.]]
--> I can see you, Kirk... Can you see me?
* '''LargeHam''': He quotes [[ShoutOutToShakespeare Shakespeare]] as a ''[[IShallTauntYou battle taunt.]]''
* ObiWanMoment: When he realizes that ''Enterprise's'' torpedo is homing in on his ship, he simply waits for it while quoting Shakespeare.
* 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.
->'''Played by:''' Creator/DavidWarner
The intellectual and soft-spoken chancellor of the Klingons, who seeks peace with the Federation.
* 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.
* XMeetsY: Gorkon is UsefulNotes/AbrahamLincoln meets Mikhail Gorbachev as [[ProudWarriorRaceGuy a Klingon]].
->'''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, 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''.
->'''Played by:''' Paul Rossilli
A high-ranking Klingon officer.
* 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.
->'''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.
** 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.