A space combat simulator released in 2000, and the Spiritual Successor of Star Trek: Starfleet Academy.Like its predecessor, the game is set in the early 2290s, though this time is structured as a direct prequel to the film Star Trek VI: The Undiscovered Country, with Christopher Plummer and David Warner reprising their respective roles as General Chang and Councillor (later Chancellor) Gorkon. Whereas Starfleet Academy was set entirely in the simulator room (aside from the very last mission) however, only the first half of Klingon Academy is actually set at the titular institution, with the second half of the storyline having the player character, Torlek fight alongside Chang in a three-way civil war between the newly-installed Gorkon, the traitorous Melkor, and Chang himself.
The final academy mission features what can only be described as General Chang's wet dream of an assault on Earth, which ends with the Klingons unleashing a modified Genesis Device which rips apart matter at the molecular level, without bothering with that tricky "rearranging it into life-sustaining patterns" stuff.
In the latter stages of the game you get an all-too-real example of this trope, when Melkor uses a supernova weapon on the star system that is responsible for the production of 80% of all the Klingon Empire's dilithium. This in turn sets up another example in the sixth film, as the only other place with enough dilithium to serve the Empire's needs is the moon of Praxis, which goes kablooie at the start of that film.
Bittersweet Ending: While the game ends with you successfully ending Melkor's attempted coup, the Empire has suffered massive infrastructure damage, is being forced to overmine the moon of Praxis to keep things up and running, and Torlek is assigned to a deep-space exploratory mission, after which he never sees Chang again.
Book Ends: The game starts with Chang stopping an attempted coup by Melkor's older brother Kalnor, and killing him in orbit of Qo'noS. The final mission has you taking on and destroying Melkor, also in orbit of Qo'noS.
Crazy Enough to Work: One of the academy missions has you having to take on a Federation battle station, something way out of the league of your K't'inga-class cruisers. Your first squadmate, K'Poraq derides the task as being completely impossible, while your second, Jaghjech suggests it might be doable with skillful use of your cloaking devices. At that point the third squadmate, K'Mpec speaks up and suggests hijacking a Starfleet vessel and carrying out a Wounded Gazelle Gambit that involves getting the battle station to lower its shields, then blowing up the ship. While the other two squadmates mock this idea, it turns out to be by far the best way to complete the mission.
Dirty Coward: This describes Melkor to a tee. Firstly he dupes Chang's forces into capturing a starbase which is then set to self-destruct, and later on he lures Chang into an ambush in a nebula filled with Romulan forces.
Drill Sergeant Nasty: Surprisingly enough, this is mostly averted by the instructors at the academy, who have a firm but very even-handed teaching style. Except for Poktarl, who takes great delight in belittling and insulting you, thus making it satisfying as hell when you end up handing him over to the Tholians to prevent them getting involved in Chang's simulated war with the Federation.
Early-Bird Cameo: Not only do we see Chang and Gorkon before the events of the sixth film, but one of the side characters is a young version of K'Mpec, the initial Klingon chancellor in Star Trek: The Next Generation. In a variant, a side-mission during the academy phase of the game has you taking Chang's experimental fire-while-cloaked Bird-of-Prey on a test run.
Exact Words: In one cutscene, Chang asks the trainees what the weapons on a Klingon Bird-of-Prey are. K'Mpec begins rattling off the ship's technical specifications, only for Chang to cut him off and say that on a Klingon starship, everything is a weapon. K'Mpec actually takes this idea to heart and comes up with the aforementioned plan to take down a Federation battle station.
Your main squadmate at the academy, Jaghjech decides to defect to Melkor's faction early in the conflict and unsuccessfully tries to persuade you to do the same.
An unwilling example is Brigadier K'Mak, an instructor at the academy, whose elder brother decides to join Melkor, forcing him to do so as well. This ends up having tragic consequences when K'Mak is chosen to set off the supernova weapon that destroys the system containing nearly all of the Empire's dilithium mines.
Foreshadowing: The game is basically a prequel to Star Trek VI, so naturally it features a ton of this, particularly in the ending with the mention of Praxis now being massively overmined, and Chang revealing his conspiracy to Torlek.
Full Motion Video: Like Starfleet Academy, this game features live-action cutscenes involving actual Star Trek actors.
Gaiden Game: Technically it's this to Starfleet Academy, as the two games are set simultaneously.
Game Mod: Like Star Trek: Armada, which was released just a few months earlier, this game developed a sizeable modding community.
General Ripper: Played with by General Chang, who wants nothing more than to obliterate the Federation and wipe the human race off the face of the galaxy, but is also Genre Savvy enough to know that such a war can only take place when the circumstances are absolutely right — in other words, not when the Empire has an elderly, dying chancellor, or when it's involved in a civil war.
The Ghost: Chancellor Lorak, Gorkon's predecessor as the head of the Klingon government, is frequently mentioned in the first half of the game, but never seen in-person. Justifiable, since he's mentioned as being severely ill and barely able to rule at the start of the game.
Honor Before Reason: Par for the course with the Klingons, but it gets taken to extremes when K'Mak sets off the supernova weapon in the Tal'Ihnor Gates system purely because his honor and duty to Melkor demand it.
Identical Great-Uncle: Thok Mak, the brother of Colonel Worf from Star Trek VI. He doesn't actually appear in person, but is voiced by Michael Dorn and sounds identical to both his brother and his better-known Great-Nephew.
Reasonable Authority Figure: Gorkon is as much this as he was in the sixth film. Unfortunately, Chang refuses to support him due to his desire to hold peace talks with the Federation. That said, Chang himself is very much this as well, knowing full well what a disaster it would be for Melkor to rule the Empire.
Sequel Escalation: Even if it's not a true sequel to Starfleet Academy per se, it really ramps up the scale of things compared to its predecessor.
Ungrateful Bastard: In the third-last mission you save Chang's life by calling on Gorkon's aid to save him from an ambush at the hands of Melkor and the Romulans. Except that in doing so, you make Chang honor-bound to serve Gorkon and allow his faction to be absorbed. Chang thanks you for this by throwing you off his task force and assigning you to an unimportant mission on the fringes of the Empire... though it actually turns out to be fortunate for all involved, as in doing so you find out Melkor's next plan.
Values Dissonance: In-universe; the reason why Jaghjech and K'Poraq mock K'Mpec's idea to use a hijacked Starfleet ship in a "trojan horse" tactic is because a Klingon starbase would not lower its shields in such a situation, therefore they don't believe a Federation one would either. If the strategy is carried out however, the battle station does lower its shields, with fatal consequences for them.
You Look Familiar: Nearly all of the actors in the live-action cutscenes had been in Star Trek before. That said, none of them aside from Plummer or Gorkon had appeared in anything set in the movie era, meaning that there could potentially be a lot of Identical Grandchildren running around in this game.