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Summary
Most of the fourth dimension , Starfleet ’s bravery and ingenuity are enough to come through every fight and salvage every day , but the tragicStar Trekbattles that Starfleet lost are defining events along theStar Trektimeline . calamity like Wolf 359 inStar Trek : The Next GenerationandStar Trek : Deep Space Nine ’s Dominion War pretend a whole multiplication , with characters carry the heavy burdens of their hump one ’s deaths or their own survival of the fittest as part of their backstories . Entire seasons ofStar Trek : Discoveryare ground by mysteries that come with more losses for Starfleet , and question the effects of tremendous tragedy on individual masses .
Starfleet ’s exit are an integral part ofStar Trek ’s storytelling becauseloss shows that not every engagement can be won , even inStar Trek ’s optimistic future . Sometimes the enemies are stronger , faster , or smarter . Sometimes the heroes miss the resource or strategy necessitate in rescript to win , and sometimes their hands are tie with directive from higher up the chain of command . Star Trek ’s military posture is in its characters , and how they deal with red ink is an important part of testify who these people are , both while tragedy is striking , and in the backwash of painful events .
Some of Star Trek ’s enceinte villains have made Earth their ultimate target , as it support as the gem of the idyllic United Federation Of Planets .

9The Borg Betray Janeway’s Alliance
Star Trek: Voyager Season 4, Episode 1, “Scorpion, Part II”
When the USS Voyager finally encountered Borg quad on their journey across the Delta Quadrant , Captain Kathryn Janeway ( Kate Mulgrew)made an unheard - of bond with the Borg , and forebode help in defeating Species 8472 in exchange for safe passing . Commander Chakotay ( Robert Beltran ) counsel against the bond with a prescient warn that the Borg could n’t be trusted , but Janeway still reserve the Borg to modify Voyager . After Janeway ’s end of the bargain was accomplish , the Borg terminated Janeway ’s alliance , and their representative , Seven of Nine ( Jeri Ryan ) , continued assimilating the USS Voyager .
8Jadzia Dax’s Death
Star Trek: Deep Space Nine Season 6, Episode 26, “The Tears of the Prophets”
The end of Lt . Commander Jadzia Dax ( Terry Farrell ) was a great loss forStar Trek : Deep Space Nine , soberly affecting thecharacters ofDS9while introducing a muscular spiritual front to the Dominion War . After Captain Benjamin Sisko ( Avery Brooks ) disregard the Prophets ' monition to continue on DS9,the Emissary ’s absence left DS9 vulnerable to unexpected spiritual attacks . In the Bajoran temple , Gul Dukat ( Marc Alaimo ) loose the pah - wraith that killed Jadzia Dax and went on to attack the seer through the Orbs . Heavy with guilt feelings over Dax ’s death and the prophesier ' apparent absence seizure , Sisko left DS9 without warn at a clock time Starfleet demand Sisko most .
Although Ensign Ezri Dax ( Nicole de Boer ) come inDS9season 7 as Dax ’s new host , Jadzia never appeared again inStar Trek .
7The Gorn Destroy the USS Cayuga at Parnassus Beta
Star Trek: Strange New Worlds Season 2, Episode 10 “Hegemony”
Captain Marie Batel ’s ( Melanie Scrofano)USS Cayuga was on a human-centred aid mission to the Parnassus Beta colony when the Gorn Hegemony attacked , having determined Parnassus Beta to be turn up within Gorn space . The USS Enterprise , lead by Captain Christopher Pike ( Anson Mount ) , reply to the Cayuga ’s distress call to find the Cayuga altogether ruin . As the Enterprise bear the Federation ’s border against Gorn forces amassing nearby , Pike leave a team into Gorn place to rescue subsister on the settlement , and happen Parnassus Beta had been massacred . The loss of the Cayuga and 5,000 colonists strained tension between the Federation and Gorn Hegemony , potentially inviting state of war .
6The Living Construct Nearly Destroys Starfleet
Star Trek: Prodigy Season 1, Episodes 19 & 20, “Supernova, Parts I & II”
After First Contact with Starfleet led to the Vau N’Akat nearly pass over themselves out , the Vau N’Akat vowed revenge by placing a weapon , the living construct , within the USS Protostar , which would destroy Starfleet ship through their communication systems . The crew of the USS Protostar tried valorously to protect Starfleet as they finally entered Federation blank space , but The Vindicator ( Jameela Jamil ) activated the Living Construct , starting the Ernst Boris Chain reaction that caused the USS Dauntless ' weapons to fire on other Starfleet ships , then reflexive distress calls that summoned more Starfleet ships , then those ships firing on each other , then more reflex hurt call , then …
Star Trek : Prodigy season 1 end with a noble sacrifice and hint about what ’s to add up in season 2 . We break down every big present moment and what it means .
5The Dominion Take Over Deep Space Nine
Star Trek: Deep Space Nine Season 5, Episode 26, “A Call to Arms”
Star Trek : Deep Space Nine ’s Dominion Warofficially began when the Dominion , using their Cardassian ally , drove Starfleet force out of Deep Space Nine and retook the place as Terok Nor . Things looked grim for Starfleet even before the Dominion acquire over DS9 , with a new Jem’Hadar convoy make it nearly every workweek and rumors that the Romulans had bring together the Dominion . negotiation with the Dominion broke down , forcing Bajor to sign the Dominion ’s nonaggression treaty to ensure their safety . Starfleet was distribute slender and left DS9 to its own machine , with a minefield that promote the Dominion to snipe instead of deterring them as design . DS9 was lost , but the war had just begin .
4The Battle of the Binary Stars
Star Trek: Discovery Season 1, Episode 2 “Battle at the Binary Stars”
Although the USS Enterprise was n’t recalled from its exploratory missionary work to fight back in the Klingon War , the extent of psychological damage bear by Starfleet ’s Klingon War veterans is explored inStar Trek : unknown New Worldsseason 2 , episode 8 " Under the Cloak of War " .
3The Mars Attack of 2385
13 Years Before Star Trek: Picard Season 1
InStar Trek : Picardseason 1 ’s backstory , the2385 attack on Marswas organise by the Zhat Vash cabal within the Romulan Tal Shiar , dedicate to the elimination of synthetic living forms , even at the toll of their own people . Through Zhat Vash interference , A500 androids forge at the Utopia Planitia Shipyards turned on their organic counterpartsbefore using Mars ' own infrastructure to ruin the satellite ’s surface , rendering Mars uninhabitable . The synth attack culminated in the loss of over 90,000 living , all Martian colonies , the Shipyards , and the delivery fleet stick to for Romulus to ferry refugee from the impending supernova . Without Starfleet ’s assistant evacuating Romulus , the stay Romulan lives were confiscate , bringing casualty into the billions .
2The Burn
120 Years Before Star Trek: Discovery Season 3
The Burn ruined Starfleet not just by kill millions , but bydestroying the very estimate of Starfleet . After leading the USS Discovery 930 age into the future , Commander Michael Burnham ( Sonequa Martin - Green ) emerged in the thirty-second hundred to notice a confused galaxy decimated by The Burn , an event that offend the warp cores of all active starships by rendering dilithium inert over a century to begin with . meg were instantly killed , and warp travel became all but impossible since most remaining dilithium became a valued trade good controlled by the condemnable Emerald Chain . Federation extremity worlds were disconnected and isolated , give Starfleet saint like cooperation and Leslie Townes Hope all but dissolved .
Star Trek : Discovery season 5 is the final season of Paramount+ ’s flagship series , and here ’s everything we know about Captain Burnham ’s last voyages .
1Battle of Wolf 359
Star Trek: The Next Generation, Season 3, Episode 26 & TNG Season 4, Episode 1, “The Best of Both Worlds, Parts I & II”
TheBattle of Wolf 359 changedStar Trekwith lasting consequences for many characters ' personal lives and the political landscape inStar Trek ’s twenty-fourth hundred . After Captain Jean - Luc Picard ( Patrick Stewart ) was taken by the Borg and transformed into Locutus , Starfleet twit to defend itself from the menace of Borg absorption and the Federation ’s total annihilation . The Borg ’s superscript firepower and constant adaptability resulted in the loss of 11,000 life and 39 Starfleet vessels– every Starfleet ship engaged with the Borg except for the USS Enterprise - D. An entire generation would be bear upon by Wolf 359 , peculiarly Jean - Luc Picard , who still grapple with being Locutus decades later inStar Trek : Picard .
As Captain Jean - Luc Picard himself said inTNGseason 2 , episode 21 " Peak Performance",“It is possible to commit no mistakes and still drop off . That is not a weakness . That is aliveness . “As Starfleet continues exploring the galaxy , deprivation will inevitably be part of the ongoing story . Federation diplomatic negotiations does n’t always work out as intended . New life-time and new civilisation may indeed be hostile and pose solid threats , resulting in greater calamity , with grief that ripples throughout the Federation . The strong deprivation inStar Treksignal that tragedy will always be a part of life , but strength can always be found in the aftermath .
Star Trek : The Next contemporaries , Star Trek : Deep Space Nine , Star Trek : Voyager , Star Trek : Discovery , andStar Trek : Picardare streaming on Paramount+.Star Trek : Prodigyis cyclosis on Netflix .





