[[quoteright:300:http://static.tvtropes.org/pmwiki/pub/images/s_prism_cover_8003.jpg]]
A series of short novels in the StarTrekExpandedUniverse, collected in three volumes (''Infinity’s Prism'', ''Echoes and Refractions'' and ''Shattered Light''). The series presents alternate histories, wherein the familiar ''Franchise/StarTrek'' universe has been warped significantly. The series uses key moments of history as the springboard to create these altered timelines, presenting realities that result from different outcomes to established events.

There was also a Myriad Universes comic book, ''The Last Generation'', set in a universe where the Klingon Empire had conquered the Federation.
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!!This series contains examples of:

* AbsoluteXenophobe: An emissary of Species 8472 explains why his people tend to be this: Because fluidic space is one giant interconnected organic system, any contaminant is a danger to the entire realm. As the caretakers of the realm, the 8472s will not tolerate outside incursion.
* TheAlliance: The Delta Coalition, founded by the crew of ''Voyager'' and the Vostigye Union which takes them in, along with other refugee cultures in the region.
** In a universe where Khan Noonien Singh won the Eugenics Wars, the empire he founded conquers much of local space. It's mentioned that [[StarTrekNewFrontier Thallon, Danter and Xenex]] formed an alliance to stand against the human augments, only to be destroyed by this universe's version of Jean-Luc Picard.
* AlternateHistory: The series is essentially a collection of alternate histories, taking key moments in the Star Trek MythArc and offering hypothetically different outcomes, taking the Trek universe in different directions from the original. So, we have a history where Khan won the Eugenics Wars and took control of Earth, and another where Terra Prime succeeded in isolating Earth from the interstellar community (so TheFederation formed without human participation). There’s one where ''Voyager'' turned back rather than cross Borg space, etc.
* AngstySurvivingTwin: In ''Places of Exile'', one of the Delaney sisters on ''Voyager'' is killed in a battle with Species 8472. The surviving twin leaves the ship and joins a nunnery.
* BrainUploading: Happens a lot in ''A Better World'', based on the procedure used by Ira Graves in "The Schizoid Man", since in this universe the availability of "blank" positronic brains means he didn't need to take over Data.
* CrapsackWorld: If Spock died in childhood (as was the case in the popular “Yesteryear” timeline in an episode of ''WesternAnimation/StarTrekTheAnimatedSeries''), the 23rd century becomes a CrapsackWorld. As revealed in ''The Chimes at Midnight'', Earth is devastated by the Whalesong Probe from ''[[Film/StarTrekIVTheVoyageHome The Voyage Home]]'', and the Alpha and Beta quadrants are caught in an escalating arms race due to use of the genesis device. Also, if the Cardassians don’t withdraw from Bajor in 2369, the 24th century ends up in CrapsackWorld territory. ''A Gutted World'' presents the Dominion manipulating the Alpha and Beta quadrants into weakening themselves so significantly it looks as if Dominion takeover is inevitable. And [[spoiler: ''all the main characters'' - [=DS9=], Next Gen ''and'' Voyager - ''die'']].
** In ''The Tears of Eridanus'', Vulcan is a CrapsackWorld, due to literally thousands of years of constant warfare. In this universe, Surak never arose and turned his people to peace and logic; as a result, Vulcan is a primitive hell-hole.
* FantasticCasteSystem: The Bourget, one of the minor races of the Delta Coalition. Worker-caste Bourget are mentioned; given the hints we're given on the nature of Bourget biology, their caste system may have a biological basis.
* FantasticRacism: Andorian Commander Thelin is on the receiving end of some, due to his part-Aenar heritage.
** The reptilian Voth consider all endotherms, such as humans, to be lesser beings. They also show disdain for carnivores.
* {{Fingore}}: In ''The Chimes At Midnight'', David Marcus is tortured by the Klingons and has one of his fingers broken.
* {{Flanderisation}}: Perhaps because he only gets one scene in ''The Chimes At Midnight'', General Chang seems incapable of going a single sentence without quoting Shakespeare. Including the TitleDrop.
* FreudianTrio: In ''The Chimes At Midnight'', we're told that in this universe Dr [=McCoy=] tries to give Kirk the pragmatic options, in order to counterbalance Thelin's Andorian passion. Yes, [=McCoy=] is TheSpock.
* GunboatDiplomacy: In ''Places of Exile'', the Voth send an entire city ship to Vostigye space in order to make their demands.
* HeelFaceBrainwashing: At the end of ''A Better World'', we're told that Lore has had the errors in his programming corrected and is now a committed supporter of biological rights.
* {{Hypocrite}}: In one notable scene, the Vorta Kilana reflects on how the Voth are rigid in their thinking and brutal in enforcing their doctrine; she considers them an example of everything the Dominion exists to stamp out. This is intended as insight into Kilana (and the Dominion's) own blindness, naturally.
* InSpiteOfANail: Happens a few times; for instance Thelin replacing Spock apparently didn't change much of anything until Spock didn't die in ''Film/StarTrekIITheWrathOfKhan''. And Khan Noonien Singh winning the Eugenics Wars, leading to 400 years of eugenics and genetic alteration, results in the human [=DS9=] regulars being supermen rather than not existing. They even all end up in Bajoran space. In ''The Last Generation'', Worf, Klingon governer of Earth, has a [[HalfHumanHybrid quarter-human son]]. We never learn his real name, but his subordinates mock him by giving him a human nickname - Alexander.
* InstrumentOfMurder: The Andorian ''flabjellah'' is a combination sidearm/musical instrument. It exists in the mainstream Trek 'verse, but is more prominant in the ''Tears of Eridanus'' timeline.
* MeaningfulName: The S'paaphonn (Many sci-fi fans will be familiar with the exclamation "Spa Fon!").
* {{Microts}}: Among other interesting little facts, we learn that 6 human months equals about 4 Vostigye ronds, and nearly 40 Talaxian niziks. Neelix likes using varying time measurements because it gives him more excuses for anniversary parties.
** As well as ronds, Vostigye use lants, apparently their equivalent of minutes.
* TheMissingFaction: Two of the stories start with the assumption that one of the founding races of the United Federation of Planets wasn't involved. ''A Less Perfect Union'' shows a xenophobic Earth withdrawing from the Coalition of Planets due to the actions of [[Series/StarTrekEnterprise Terra Prime]], leaving only Vulcan, Andor and Tellar. Humans wind up in a cold war scenario with this "Interstellar Coalition". In ''The Tears of Eridanus'', meanwhile, Vulcan never turns to logic and remains a primitive warlike culture, leaving Andor as the galvanizing force behind the formation of a Federation-equivalent.
* MugglePower: The third story in the ''Infinity's Prism'' collection features a universe in which Khan Noonien Singh won the Eugenics Wars. He then proceeded to create TheEmpire, which subjugated the rest of the Trek 'verse. The story concerns "Princeps" Julian Bashir of the ''Defiance'' (who is also genetically enhanced in the "normal" universe) finding the ''Botany Bay''. In the TOS episode ''Space Seed'', the Bay carried Khan and his followers, but in this universe, it carried regular humans on the run from the Wars. Does WhatMeasureIsANonSuper ensue? Oh, yeah.
* OffWithHisHead: In ''The Tears of Eridanus'', [=Evil!T'Pau=] executes Dax and presents his head as a trophy.
* PoseOfSupplication: The Voth demand this from others as their due, particularly when bestowing their benevolence. As the eldest race in the Delta Quadrant (or at least they assume so), they consider themselves its rightful rulers. When agreeing to spare Fluidic Space from destruction, their condition is that the Species 8472 representative bow before them and pledge his loyalty to the Voth Council.
* {{Pride}}: “Boothby” the 8472 Groundskeeper has to swallow his in order to save his people. The Voth, who are themselves the most prideful race around, agree to spare his realm from their doomsday weapon if he declares his loyalty to the Voth Council and bows before them. Chakotay convinces him to do so.
* SexyDiscretionShot: In ''The Chimes at Midnight'', this gets played rather straight between [[spoiler: Saavik and David Marcus]]:
-->Their lips met, and in perfect unison their bodies slowly sank down to the ground. On the distant horizon, [[SomethingElseAlsoRises another volcanic mountaintop erupted, its hot magma shooting forth into the air]]. And the ground once again trembled, shaken by nature's primal throes.
* SharpenedToASingleAtom: The blades used by the Children of Khan in ''Seeds of Dissent''.
* ShoutOut:
** In ''The Tears of Eridianus'', the only hope for a war-torn, hellish Vulcan where Surak never existed is the ''katra'' of the ancient poet S'task, who teaches a philosophy called ''mnhei'sahe''. In Creator/DianeDuane's non-canonical but beloved Literature/{{Rihannsu}} novels, S'task was Surak's former pupil, who abandoned his teacher's pacifism and left Vulcan with his followers, the Rihannsu (aka the Romulans)... whose culture's guiding principle is a concept called ''mnhei'sahe''.
** ''Places of Exile'' sees Tom Paris refer to the Species 8472 planet-destroyer weapon as a [[Anime/SpaceBattleshipYamato wave-motion gun]]. Janeway promptly assumes the description was [[LampshadeHanging another of Tom's obscure twentieth-century cultural allusions]].
* ThrowTheDogABone: According to WordOfGod, planet Coridan's prosperous status in ''The Tears of Eridanus'' is an example of this, seeing as in the mainstream StarTrekNovelVerse Coridan is the Federation's ButtMonkey planet.
* UnwittingPawn: Kirk in ''A Less Perfect Union''. His attitude towards aliens makes him relatively easy to steer into a [[spoiler: Romulan]] plot aimed against the Earth/Interstellar Coalition negotiations. Also, in ''A Gutted World'', the entire Alpha and Beta quadrants end up [[UnwittingPawn Unwitting Pawns]] to the Founders of the Dominion.
* WhatMeasureIsANonHuman: One of the stories is set in a timeline where androids like Data are mass-produced for Starfleet. They are considered more disposable than organic officers. Also, in a universe where Khan was victorious, the human augments have established themselves as the dominant power in known space, fuelled by this belief. Some of the racist humans in ''A Less Perfect Union'' show a form of it, too.
* WhatMeasureIsANonSuper: The empire founded by Khan Noonien Singh.
* WholePlotReference: ''Honor in the Night'' tells the story of a journalist trying to find out the meaning behind a famous person's last words, by talking to a lot of people who knew the deceased, and the whole thing is told in an interlocking non-linear flashback structure. [[CitizenKane Sound familiar?]]
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