''Star Trek: 25th Anniversary'' was the first [[AdventureGame adventure videogame]] based on the ''Franchise/StarTrek'' franchise, released in 1992 by ''Interplay''. The game, based on [[Series/StarTrekTheOriginalSeries The Original Series]], combines classic PointAndClick gameplay with furious space combat, and features pretty much every staple the series had to offer.

The game is built in "episodes", each of which is a stand-alone scenario. After receiving their mission from Starfleet and arriving at their destination, the principal characters (Kirk, Spock, [=McCoy=], and the obligatory RedShirt) beam down to investigate, and have to resolve the situation with skill and cunning. The use of inventory items, [[DialogueTree Dialogue Trees]] and standard actions is similar to many adventure games of the time. Each mission also has a space battle either at the beginning, end or sometimes in the middle - a fairly simple (though sometimes [[NintendoHard extremely difficult]]) 3D simulator played from the bridge of the Enterprise.

What perhaps makes ''25th Anniversary'' stand out among other ''Franchise/StarTrek'' games is its ability to capture the feel of the original series in pretty much every aspect. Missions begin with a fly-by of the enterprise and the name of the episode in yellow ''Franchise/StarTrek'' font. Space battles are accompanied by the fondly-remembered sounds of photon torpedoes and phasers, and you must use your bridge crew members constantly throughout the battle to manage your energy and repair the ship. The ship's computer is ready to provide you with lots of background information about the ships, planets and peoples you'll meet. On planetside, your RedShirt is likely to die first if you're not careful, Spock and [=McCoy=] will constantly banter with each other (and need to be "used" to perform actions suitable for them, like [=McCoy=] healing people or Spock examining machinery), and Kirk's [[KirkSummation particular method of oratory]] is prevalent throughout the entire game.

To make things even better, the entire cast of the original series gave their voices to the CD-ROM edition, including even Majel Barrett's voice for the computer. This finishing touch helps bring this game closer to the experience of actually playing Kirk and his teammates in a Trek episode.

Though each episode is individual, not connected to the others in terms of storyline, the player is still given a score at the end of the game based on his performance throughout. Most importantly, the player has to take care to conduct diplomacy and seek the peaceful resolution for each episode. In particular, the death of the RedShirt (though a staple of the series) must be avoided to achieve a perfect score.

''25th Anniversary'' is still considered one of the best ''Franchise/StarTrek'' games made, despite its final mission which consisted primarily of an [[NintendoHard incredibly difficult space battle]] (though it was replaced with an actual, very long mission on the CD-ROM edition -- followed by an incredibly difficult space battle and occasionally contained a serious [[{{Unwinnable}} bug]]).

A year later in 1993, Interplay reused the same PointAndClick engine to produce a sequel, called ''JudgmentRites''. In many regards, ''Judgment Rites'' is superior to ''25th Annivesary'', including both plot and gameplay. As TheOtherWiki states, many fans consider these two games to comprise the fourth and fifth years of the Enterprise's five-year mission (since the original series ran for only three seasons).


!!This work contains examples of the following tropes:

* [[HumanPopsicle Alien Popsicle]]: In the first mission, "Demon World", the Nauians placed themselves into stasis to survive an apocalypse. A [[{{Telepathy}} telepathic]] computer reads the minds of any intruder to their stasis facility, [[MasterOfIllusion quickly manufacturing robots that look like the intruder's most fearsome enemy]] to try and drive him away.
* BottleEpisode: The final mission on the CD-ROM version plays with the trope, taking place in a near identical "sister ship" to the ''Enterprise''.
** The subversive aspect is that, since the game never actually showed us any part of the ''Enterprise'' other than its bridge and transporter room, ''all of the scenes'' in this add-on mission had to be made entirely from scratch. In this way, they both played the trope straight from the TV series' perspective, and fully subverted it from the game's perspective, at the same time.
* DarkerAndEdgier: Most of the missions wouldn't be out of place in TOS, but the CD version of the final mission... put it this way, it makes the wreck of the ''Constellation'' in the TV episode "The Doomsday Machine" look '''tame'''. It starts with Kirk's horribly injured former Academy classmate (and it's implied former girlfriend) dying as she accuses Kirk of murdering the entire crew of the ''Republic''. Then you get to spend the rest of the mission trawling through the wrecked ship, and seeing first-hand the utter carnage that resulted.
* DoomsdayDevice: A race in nuclear warfare set one up on their moon. It didn't go off. A millennium later, when they worked their way up from the stone age back to radio technology, the moon base picked up the transmissions and rearmed itself, ready to land the blow for good. Fortunately, there's a virus in the system which you can have Kirk and the gang use to infect the missile launching system's timing and thus have the missiles launch harmlessly into space.
* GhostShip: The Enterprise discovers Harry Mudd staking a claim on one of these.
* HostageSituation: Mission 2, "Hijacked", where Elasi pirates do this to a Federation starship. There are [[MultipleEndings several possible endings]], and only one where everyone survives.
* ICantUseTheseThingsTogether: Kirk protests thusly, even when you order another crew-member to carry out the task. Read the trope article for more.
* MirrorMatch: And then some. The Enterprise has a battle against another (fake) Constitution-class starship, except it's armed to the teeth and accompanied by escorts.
* Multiple Endings: Most missions have several possible outcomes. Kirk's score at the end of each mission relies primarily on how the mission ended, though individual actions during the mission may also alter the score.
* MythologyGag: It wouldn’t be ''Trek'' without 'em.
-->'''Lt. Buchert''': ''Captain, count your blessings! We haven't met any salt vampires, deranged computers, blood-draining clouds, cell imploding sirens, Greek gods, or any of the other things people keep telling me about in [[RedShirt security]].''
-->'''Kirk''' [who dealt every single one of those in TOS]: ''There's not much I wouldn't do to not have to deal with Mudd.''
* NintendoHard: See MirrorMatch, above.
* SufficientlyAdvancedAlien: Quetzalcoatl (yeah, the Aztec god) turns out to be one of these. And he's not happy about the human sacrifice.
* ShownTheirWork: The attention to detail is amazing on it's own, but to show how much the programmers really did their research, take half an hour to explore the database of Spock's library computer on the bridge. Information about every single planet visited by the Enterprise in the original series can be accessed, [[ContinuityNod among other things]].
* UnwinnableByMistake: Not in the original version of the game, but as more and more earlier games are put online, people have unfortunately discovered that the second mission is Unwinnable. In-game, when on the ship, the 'tab' key is supposed to switch between flying the ship, and interacting with characters on the bridge. Unfortunately, if playing the game on a website, 'tab' unfortunately still pages between locations on the page without being recognized by the game. Unwinnable By Outdated Controls?
* UpdatedRerelease: The CD-ROM edition. Not only did it include voice acting, it also had an entire landing team mission that was not seen in the original disk version.
* VideoGameCrueltyPotential: [[OnceAnEpisode Every mission]] there is always, ''always'' at least one method of getting your RedShirt killed off for shits and giggles. You do lose points for it, though.
** Also the one mission where you've got the option of releasing laughing gas (of both the Human and Vulcan variations) into the air of the station you're on. It's not ''that'' cruel, mind, but still...
*** There's another mission where you can end a hostage situation aboard another ship's bridge by beaming a bomb inside and blowing the bridge up, causing the ship to go out of control and crash into the planet it's orbiting. Expect Starfleet Command to ream you out for such an act of blatant dickery.
* WhatAnIdiot: Kirk's general reaction to learning that Mudd's bumbling with an ancient computer had its memory erased and an invaluable archaeological treasure is lost forever.[[invoked]]