Alternate timeline

Alternate timelines were altered versions of the timeline. Unlike parallel universes, alternate timelines often did not seem to diverge from the universe, but instead rewrote history to the point of wiping out the original timeline. However, alternate timelines did sometimes co-exist as alternate realities. (; ; ; ; ; ; )
== Alternate timeline creation ==
There were several methods of temporal manipulation that could create an alternate timeline:
* A temporal incursion into the past could cause an alternate chain of events to unfold. However, in the cases where the time travel event was part of a predestination paradox, an alternate timeline would be created if the paradox was not completed. () In at least one case, when accidental time travel from 2371 led to the premature death of Gabriel Bell in 2024, an altered future existed for the same amount of time it took for Benjamin Sisko to replace and complete Bell's vital role in the "Bell Riots" of 2024. ()
* Time travel to the future of a timeline could create an alternate future, where the time traveler had never returned back to the past from the future. Such was the case, for example, when the traveled from 2344 to 2366 through a temporal rift. (; ; ) This however did not always occur, such as in the case when Samuel Clemens visited the 24th century through a temporal distortion created by the Devidians. ()
* Sometimes objects and people who had traveled through time from the future into the past would vanish when the timeline is altered enough, such as an alternate Captain Jean-Luc Picard who came to the past through an energy vortex in 2365. () When objects were pushed completely out of the space-time continuum, they were also erased from history, creating an altered timeline, where the object never came into being. Such was the case with the effect of the main energy beam weapon of the Krenim weapon ship and destroying the interspatial parasites that had infected Captain Jonathan Archer in the 22nd century. (; ) According to the Borg Queen, a similar fate would have awaited the alternate future Vice Admiral Kathryn Janeway, if the Queen had managed to kill her counterpart Captain Janeway in 2378. () More commonly though, changes to the past of a timeline did not cause the objects and people from an alternate future to vanish. Multiple versions would then coexist. These alternate versions could be reintegrated into a single person using 29th century technology. ()
* Sometimes, the original version of the future would come to be regarded as an alternate timeline after changes to history were made. For example, Kes of 2376 in the original timeline damaged , murdered B'Elanna Torres, and vanished by traveling five years into the past. Her presence in the past altered the future, creating a new timeline where, at the time of Kes' return, Captain Janeway prevented harm from coming to her crew, and Kes returned to instead of time traveling. ()
As a rule, Starfleet officers were forbidden to cause changes in the timeline or to share their knowledge of future events by the Temporal Prime Directive. () The Department of Temporal Investigations was tasked to ensure that time travel events did not contaminate the timeline. () By the 28th century, changing the timeline had become more universally illegal after the Temporal Accord was established. () By the 29th century, Starfleet had taken it on as a mission to use time travel as a means of upholding the integrity of the timeline by fixing changes in the past. It was also Starfleet policy by then to integrate different versions of people into one, when several coexisting ones appeared due to paradoxes and time travel. () By the 32nd century, time travel had been banned outright because the Temporal Wars made it clear that time travelling societies could not be trusted to shun fanatics such as Vosk who felt entitled to alter the timeline regardless of the consequences. (; )
While the prime timeline was usually restored by operatives from the 29th to the 31st centuries, in some cases, the influence of alternate timelines remained as a part of the chain of events in the prime timeline. The crew of the , for instance, would not have learned that they had to travel to the past to convince Zefram Cochrane to make the test warp flight, had they not accidentally witnessed an alternate timeline, where the Borg prevented Humanity's First Contact with the Vulcans and assimilated Earth. (; ) Warnings, temporal incursions and information of the original future were also an integral part of the prime timeline. Such was the case, when Captain Jean-Luc Picard shared his experiences of the future shown to him by Q, to his crew in 2370, causing them to make different life choices that created a new and entirely different timeline of the future. () was rescued and aided by its crew members from the future. In 2375, a transmission from Harry Kim from 2390 averted the crash landing of the Voyager. In 2378, technology and assistance from Admiral Janeway from 2404 saved the ship from a longer disastrous journey through the Delta and Beta Quadrants. ()
== Alternate realities ==
Different versions of a timeline also sometimes coexist as parallel universes. Most active temporal anomalies allow interaction between two different alternate timelines for a moment, making them parallel realities in relation to one another. (; ; ; )
Borg Queens had transtemporal awareness, which granted them knowledge bridging into other alternate timelines and realities, described as hearing "echoes" of alternate versions of themselves that co-existed with their own. ()
* The term "alternate reality" was briefly referenced by and when the two debated whether such a phenomenon even exists. ()
* Time travel to the past by the Romulan mining vessel Narada through a black hole created with red matter resulted in the creation of an alternate reality. () In 2384, Wesley Crusher referred to this alternate reality as the Narada Incursion. ()
* In 2370, Q allowed Picard to shift his consciousness between three different timeframes, one in the past, one in the present and one in the future from Picard's point of view, in order for him to create an anti-time eruption. The eruption was linking these timelines together, and when it collapsed the timelines ceased to exist. ()
* In 2371, radiation poisoning and the temporal energy emissions of an artificial quantum singularity of a Romulan Warbird allowed Miles O'Brien to jump between the prime timeline and several alternate timelines, in some of which Deep Space 9 was destroyed. At least during some of the jumps two of the timelines coexisted. O'Brien was eventually replaced by one of his future selves. ()
* Harry Kim considered an alternate reality as one possible cause for his sense of déjà vu and familiarity to a region of space in the Delta Quadrant, until the Taresian retrovirus was discovered to be the actual cause. ()
* In 2384, Wesley Crusher mentioned that as a part of the Travelers, he had visited all of the quantum timelines, alternate realities and planes of existence. ()
== Pockets, folds, and fragments ==
* It was possible to artificially create pockets where a previous timeline continued, while the timeline of the rest of the universe was changed. Such technology as a subspace bubble, a subspace isolation field, temporal shields, and the wake of a temporal vortex kept any enveloped object in a pocket with its own timeline. The Guardian of Forever was also capable of maintaining the time planet in its original timeline. (; ; ; ; )
* The race of the alien who took the shape of Cosimo existed in temporal inversion folds of the space-time matrix. The folds were parallel time streams visible as temporal anomalies intersecting the prime reality. Inside the folds, reality remained unaffected by changes in the timeline. It was possible to utilize a fold to exchange one's consciousness with an alternate timeline version of oneself. ()
* Temporal causality loops create independent fragments of time, inside which the time of the universe repeats itself. From outside the loop, it appears as if anything inside it simply vanished from the space-time continuum. For people inside the loop, the memories from previous loops begin to assert themselves as a sense of déjá vu and eventually as clearer memories. ()
== Time continuums ==
Within the universe there were also several parallel time continuums occupying the same space but in different times. ()
* The Devidians lived in a different time continuum, only a fraction of a second away, with a positive phase variance of 0.004 percent from the normal timeline. ()
* The quantum singularity lifeforms were native to a parallel time continuum. They utilized temporal apertures to travel between continuums and delivered their embryos to mature in nests inside the gravity wells of quantum singularities in our universe. The adult beings of the species were capable of taking humanoid form and were unaffected by temporal fractures. ()
* Elysia was a small parallel time continuum that periodically touched the prime universe in the Delta Triangle region. Elysia was described by Devna as a pocket in the garment of time. The collisions between the two alternate universes produced time warp vortexes in the time barrier between the universes, that allowed passage from one side to the other at high warp speed. ()
== List of alternate timelines ==
Timeline 	Timescale 	Created by 	Status 	Appearance
Captain Archer disappears and the United Federation of Planets never forms 	2152-31st century 	transporting Archer to 31st century Earth 	Negated when Archer returned to his own time 	
The Xindi and Humanity do not engage in hostilities throughout the 2150s 	2150s 	Original timeline 	Negated when the Sphere-Builders manipulated the Xindi as part of the Temporal Cold War, sparking the Xindi incident 	
The Xindi destroy Earth and all other Human colonies 	2153-2165 	Original timeline 	Negated when Archer's interspatial parasites were erased from history during the Battle of Ceti Alpha V 	
The Sphere-Builders invade the Milky Way Galaxy, but are defeated at the Battle of Procyon V 	26th century 	Unknown, possibly original timeline 	Unknown, possibly negated by the destruction of the Delphic Expanse spheres in 2154 	
remains in the Delphic Expanse for 117 years 	2037-2154 	Temporal displacement of Enterprise by a subspace corridor 	Unknown, possibly negated when Enterprise avoided time traveling 	
Temporal War 	1916-31st century 	Unknown, caused by a predestination paradox 	Negated when Enterprise prevented Vosk from returning to the 29th century 	
Michael Burnham is killed by a vicious predatory animal in Vulcan's Forge 	2236 	Original timeline 	Negated when Gabrielle Burnham warned Spock in time for him to intervene 	
The is trapped in a time loop lasting only thirty minutes in each iteration, in which most instances result in the destruction of the Discovery, during the . 	2256 	Harcourt Fenton Mudd utilized a time crystal and distracted the crew with a gormagander so that he could explore the ship's technologies and intelligence unhindered before he delivered the Discovery to the Klingons	Negated when Paul Stamets recruited Michael Burnham and to trick Mudd into ending the time loop prematurely 	
All sentient life in the galaxy is destroyed by Control, which has malfunctioned due to the inherent contradiction in destroying life to protect life and having become sentient 	2257-3186 	Original timeline 	Negated due to multiple incursions by Gabrielle Burnham, followed by the crew of the Discovery intentionally traveling to the far future in order to prevent the rogue AI from obtaining data it required to become sentient 	
is destroyed during the Battle near Xahea while Control slaughtered the Discovery bridge crew and got the Sphere data 	2258 	Possible future shown to Michael Burnham by a time crystal 	Negated by the heroic sacrifice of Admiral Katrina Cornwell and Burnham's warnings changing the course of events 	
Christopher Pike remains captain of the and the Neutral Zone Incursion leads to open war between the United Federation of Planets and the Romulan Star Empire. 	2259-unknown 	Original timeline 	Negated by Admiral Christopher Pike showing his 2259 self the timeline's version of the Neutral Zone Incursion via time crystal and dissuading him from attempting to alter the fate shown to him at the Boreth Monastery. 	
Khan Noonien Singh is assassinated by Romulan temporal agent Sera, leading to a future where Earth has been devastated by wars, the survivors are living on underground lunar colonies and Humanity is a part of the United Earth rather than the Federation.	2022-2259 	Sera assassinating Khan Noonien Singh 	Negated by La'an Noonien-Singh preventing her ancestor's assassination with the help of an alternate timeline James T. Kirk. 	
Eugenics Wars take place in the 1990s leading to World War III 	1992 	Original timeline 	Various temporal incursions shift these events into the 21st century. 	
John Christopher, a staff sergeant and the Omaha installation personal encounter the crew 	July 1969 	Actions of the temporally-displaced Enterprise crew 	Negated when John Christoper and the sergeant were returned to Earth at a point before they encountered the Enterprise 	
Nazi Germany conquers Earth and the United Federation of Planets and Starfleet never form 	1930-2267 	Leonard McCoy preventing Edith Keeler's death 	Negated when James T. Kirk stopped McCoy from saving Keeler 	
Spock dies at seven 	2237-2269 	Captain Kirk and Commander Spock 	Negated by Spock's future self 	
The is destroyed by an energy vortex 	2365 	Unknown, possibly the original timeline 	Negated when Jean-Luc Picard prevented the Enterprises destruction 	
 	2344-2366 	Temporal displacement of the 	Negated when the Enterprise-C returned to the Battle of Narendra III 	
Thomas Halloway becomes captain of the Enterprise-D instead of Jean-Luc Picard 	2327-2369 	Q causing Picard to prevent a fight against a group of Nausicaans 	Negated when Picard returned to 2327 and started the fight 	
The Enterprise-D is destroyed by a warp core breach 	2369 	Quantum singularity lifeforms 	Negated when Picard, Data, Deanna Troi, and Geordi La Forge reversed time to a point just before the breach occurred 	
Alexander Rozhenko never becomes a warrior and his father is murdered on the floor of the Klingon High Council 	2370-2410 	Original timeline 	Negated when Alexander's future self convinced his past self to become a warrior 	
An anti-time eruption forms in the Devron system and prevents the formation of life on Earth 	3.5 billion years ago, 2363-2364, 2370-2371, and 2395	Repeated temporal displacement of Picard by Q 	Negated when Picard sealed the eruption with a static warp shell 	
The Veridian system is destroyed by Tolian Soran 	2371 	Original timeline 	Negated when Picard prevented the system's destruction 	
Gabriel Bell dies and the United Federation of Planets and Starfleet never form 	2024-2371 	Benjamin Sisko and Julian Bashir causing Bell's death 	Negated when Sisko replaced Bell's role in history 	
Kathryn Janeway dies on Makull's homeworld in a polaric ion explosion 	2371 	Unknown, caused by a predestination paradox 	Negated when Janeway prevented the explosion 	
Miles O'Brien dies from a high-energy laser 	2371 	Unknown, possibly the original timeline 	Negated by O'Brien learning of his death prematurely 	
Miles O'Brien dies from radiation poisoning 	2371 	Unknown, possibly the original timeline 	Negated by O'Brien warning the past Bashir of his death 	
Deep Space 9 and the Bajoran wormhole are destroyed by a Romulan Warbird 	2371 	Unknown, possibly the original timeline 	Negated by O'Brien warning Sisko of the attack 3.5 hours before it occurred 	
Daniel Byrd joins the instead of Harry Kim 	2371 	Temporal inversion fold 	Negated when Kim returned through the time stream 	
Second Federation-Klingon hostility 	2372-2450 	Temporal displacement of Benjamin Sisko by an energy discharge from the 's warp core 	Negated when Benjamin Sisko returned to the past and dodged the discharge 	
The Call of the Prophets is not finished 	22nd century-2372 	Temporal displacement of Akorem Laan by the Bajoran wormhole 	Partially negated when the Prophets returned Akorem Laan to his proper time period 	
Henry Starling founds Chronowerx Industries and destroys the Sol system in a temporal explosion 	1967-29th century 	Unknown; caused by a predestination paradox 	Negated when Voyager destroyed the Aeon before it arrived in the future 	
The Borg Collective assimilates Earth 	2063-2373 	Borg Queen's sphere 	Negated when the defeated the Borg in the past 	
First Year of Hell 	2373-2379 	Original timeline 	Presumed negated by Tuvok due to Kes' actions in 2373 	
The crashes on Gaia and colonizes the planet 	22nd century-2373 	Temporal displacement of the Defiant 	Negated when Odo's older self altered the Defiants flight plan 	
Second Year of Hell 	2174-2374 	Multiple temporal incursions by Annorax's weapon ship 	Negated when Kathryn Janeway caused the weapon ship to erase itself from history 	
Molly O'Brien is stranded on Golana for ten years 	21st century 	Time portal 	Negated when Molly's younger self went back to 2374 	
Voyager crashes on an L-class icy planet upon emerging from a quantum slipstream 	2375-2390 	Original timeline 	Negated when Harry Kim caused Voyager to emerge from the slipstream 50,000 light years from Earth 	
Voyager is destroyed by a temporal disruptor 	2370-2375 	Captain Braxton planting the disruptor aboard Voyager 	Negated when Janeway prevented Braxton from planting the device on Voyager 	
Kes murders B'Elanna Torres and time travels to 2371 	2376 	Original timeline 	Negated when Janeway and Tuvok took precautions to prevent history from repeating itself 	
Voyager is fractured into multiple different time periods in 2377 	2371, 2372, 2373, 2374, 2375, 2377, and 2394 	Chronokinetic surge 	Negated when Chakotay reintegrated Voyager into one time period and prevented the surge from fracturing Voyager 	
Voyager returns to Earth in 2394 	2378-2404 	Original timeline 	Negated when Admiral Janeway returned Voyager home in 2378 	
The is sent to Tars Lamora alone 	Unknown point in the past-2436 	Original timeline 	Accidentally negated by Dal R'El dropping a blaster while helping with the launch, allowing Chakotay and Adreek-Hu to escape with the ship. Later partially restored by sending the Protostar to Tars Lamora 	Season 2
Solum is destroyed in a civil war after first contact with the Federation 	Late 24th century-2436 	Original timeline 	Negated when the made peaceful first contact with Solum following Asencia's defeat and her attempted war which left the Vau N'Akat with knowledge of the wonders and dangers of the galaxy. 	
Alternate reality 	2233 and beyond 	Nero's appearance in 2233 	Intact; coexists with the prime timeline as a parallel universe at least as late as 2379 	, , and
attempts to reform the Terran Empire and stop 's coup, but she and kill each other 	2250s 	Morality test by the Guardian of Forever 	Unknown; may have only existed for the purposes of the morality test, but may also be still intact due to the Guardian of Forever's comment about how an alternate version of Georgiou "may not be feeling so hot" and that will go on to save many more lives due to Georgiou's intervention.	
The xenophobic, authoritarian Confederation of Earth rules much of the galaxy, having conquered the Cardassians, Klingons, Romulans, Vulcans, Andorians, and Borg, amongst others. 	2024-2401 	Q interferes with the Europa Mission, causing Humanity to turn to Dr. Adam Soong instead 	Negated when Jean-Luc Picard, Seven of Nine, Cristóbal Rios, Agnes Jurati, Raffaela Musiker, the Borg Queen and Tallinn ensure Renée Picard's survival and the launch of the mission. 	Season 2
The is self-destructed by Jean-Luc Picard. 	2401 	Original timeline 	Negated when Picard, after returning from 2024 to moments before the explosion, realized that the Borg Queen was the same one that had merged with Dr. Agnes Jurati and thus he halted the auto-destruct. 	
The Federation is devastated by the Breen after getting Progenitor technology. 	3191-3218 	L'ak and Moll infect Discovery with a time bug, causing it to experience time cycling and never stop them. 	Michael Burnham, Paul Stamets and Rayner end Discoverys time cycling with the help of the crew of the alternate 2256 Discovery. 	
Michael Burnham, Paul Stamets and Rayner enlist the help of the 2256 Discovery crew to remove the time bug, revealing details of the future to them. 	2256 	Burnham, Stamets, and Rayner's efforts to stop time cycling caused by a time bug placed on Discovery by L'ak and Moll. 	Negated when the crew removed the time bug before it could cause a reset, meaning that their changes to history didn't become permanent. 	
== Appendices ==
=== Appearances ===
Alternate timelines are depicted in the following episodes or films:
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=== Related topics ===
* Temporal anomaly
* Temporal mechanics
* Time
* Alternate reality
* Parallel universe
=== Background information ===
The following is a list of episodes involving alternate timelines.
Episode 	Time Periods 	Cause 	Effects
 	1930-2267 	Edith Keeler's death averted by McCoy 	Nazi Germany lasts beyond 1945, United Federation of Planets does not exist
 	2269, 2237 	Death of Spock as a child 	Amanda Grayson has died, Thelin became 's first officer
 	2366 	went through a temporal rift in 2344 	Federation embroiled in with the Klingons:
* By 2366, 22 years of war have raged between Klingons and the Federation, with the death toll in the billions. At this point, the war is going badly for the Federation, and a surrender seems the most likely outcome.
* The USS Enterprise, while retaining her exterior, has been fitted as a battleship, with less luxury than the prime timeline USS Enterprise.
* The Enterprise has been fighting the Klingons for the past four years, and many, if not all, of the missions the "prime" Enterprise undertook have not been undertaken by this Enterprise.
* Related to the above, Natasha Yar is still alive in 2366.
* The Enterprise has no children on board as a result of the war.
* Wesley Crusher is a full ensign in 2366, which implies either an earlier acceptance into Starfleet Academy or, as seems more likely in this timeline, that he was drafted into the military.
, 	2024, 2048, 2371 	Gabriel Bell dies 	Federation does not exist, Romulans encroach on Alpha Centauri
 	9174 (Bajoran year) in the 22nd century (Earth calendar)	Akorem Laan disappears from history, entering the Bajoran wormhole 	Akorem doesn't complete his poem The Call of the Prophets
 	2372 	Timestream 	Harry Kim did not join , Daniel Byrd joined instead
, 	2374 	Krenim weapon ship 	Numerous incursions
 	2153-2165 	Interspatial parasites 	Archer removed as captain of , Xindi destruction of Earth and Human colonies
, 	1916-1944 	Multiple spatial incursions; Na'kuhl violate Temporal Accord; Temporal Cold War goes hot 	Vladimir Lenin assassinated by unknown temporal agent and not replaced; Union of Soviet Socialist Republics never founded; Nazi Germany able to focus on West, resulting in an alternate where, with the help of the Na'kuhl, Germany successfully invades the United States
 	2371 	Tolian Soran destroys the Veridian system 	Civilization on Veridian IV wiped out; crew killed; Soran enters the Nexus
 	2063 	The Borg assimilate Earth 	Humans never achieve warp drive; Federation never founded; Borg space in the Alpha Quadrant
, , 	2233 onward 	Accidental temporal incursion by the Narada, whose captain proceeds to enact a revenge plot that irrevocably changes the timeline 	Among other changes:
* destroyed, causing to be born early and left without a 
* Kirk joins Starfleet at a later date
* destroyed in 2258, leaving the Vulcans critically endangered
* Earth nearly destroyed
* Kirk given command of the several years early
* promoted to admiral
* Militarization conspiracy
* and his followers awakened early
* Christopher Pike killed in 2259
* Enterprise embarks on her first five-year mission under James T. Kirk several years early
* Enterprise destroyed in 2263 rather than 2285
* mystery solved
* launched in 2263 rather than 2286
Season 2	2024-2401 	Interference by Q causes the Europa Mission to fail and Earth turns to more extreme measures to combat climate change and social strife	Confederation of Earth timeline:
* Earth controls a fascist, xenophobic empire.
* Jean-Luc Picard commands the instead of the and is personally responsible for executing several heads of conquered states, including Sarek and Dukat, with the Borg Queen soon to follow.
* Annika Hansen was never assimilated, and is instead President of Earth.
* Earth is surrounded by a permanent solar shield, "on life support"
* Adam Soong is venerated as the savior of Humanity
 	2022-2259 	Romulan time agent Sera destroys a cold fusion reactor in Toronto, destroying the city and killing a young Khan Noonien Singh. 	United Earth Fleet timeline:
* The Eugenics Wars never happen and Earth doesn't come together in the same way following that devastation, though United Earth would eventually form.
* Instead of first contact with Vulcan bringing peace, it began a period of constant interstellar warfare that lasted well into the 23rd century. There is no Federation, and tensions amongst many of the erstwhile member races allows the Romulan Empire to be dominant.
* Earth is occupied for a time and later completely scoured, with ash filling the sky estimated to stay for a thousand years.
* James T. Kirk commands the in 2259 instead of Christopher Pike; Sam Kirk is killed several years early; Spock commands the Vulcan space vessel Sh'Rel instead of being science officer on the ; La'an Noonien Singh does not exist.
=== Apocrypha ===
According to the Star Trek: Myriad Universes story "Places of Exile" by Christopher L. Bennett in the novel of the series, Infinity's Prism, the concept of quantum realities is synonymous with all types of alternate timelines. According to the 2008 novel Fearful Symmetry by Olivia Woods, the mirror universe is also a parallel quantum universe, further suggesting that even trans-dimensional realms are alternate timelines.
The Star Trek: Department of Temporal Investigations novel Watching the Clock goes into detail about how and why some forms of time travel create parallel alternate realities and others lead to the overwriting of the same timeline. According to the novel, the only way one timeline could replace another is if they coexisted side by side from the moment of their divergence and were merged together again at a later point. Timelines diverge when they shift sufficiently out of phase to become non-interacting, but it is not impossible for them to interfere again at a later point in time. If they did become entangled as a single system, quantum information theory demands that only one of the two conflicting sets of information survive, as quantum history has to be self-consistent. After the merge, it would be as if one timeline suddenly transformed into another. The previous events would still have occurred, but they would no longer be remembered, as the information would have been destroyed. Two different timelines coming back into phase would violate entropy, so there needs to be some kind of force acting to merge them back together.
The game Star Trek: Armada features the , a starship that came from an alternate future where the Borg controlled most of the Alpha Quadrant. Captain Thaddius Deming of the Premonition hoped to warn the Federation of a coming Borg invasion in time to prevent the Borg victory. With the help of Captain Jean-Luc Picard of the , and after making two further temporal incursions, the Premonitions mission was a success and she returned back to the future.
The Star Trek: Coda novels establish the material seen in the relaunch novels for the series , and as being set within a quantum reality known as the in order to reconcile the differences resulting from the creation of series such as Star Trek: Picard and Star Trek: Prodigy.
=== External link ===
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 Alternate timeline