Time travel

Time travel is having the ability to or the act of travel forward or backward in time, thus breaking the seemingly irreversible flow of time. The study of this phenomenon is one of the focuses of temporal mechanics. Alterations to historical events can cause, among other things, alternate timelines and realities.
As late as 2154, time travel was deemed impossible by the Vulcan Science Directorate. ()
The United Federation of Planets had some form of time travel ability since at least 2268. Regulations on time travel were later imposed to prevent alterations from being made to the timeline. (; ; )
In addition to the Federation, the Borg Collective, Bajorans, and the Klingon Empire were known to have some form of time travel capabilities. (; ; ; ; )
== History ==
=== Overview ===
Historical research in 2268 suggested the Federation was capable of controlled time travel and used this ability at the very least for research purposes. ()
As of 2378, at least forty different instances of some form of time travel had been noted in Federation records. Technologically speaking, the Federation's capabilities concerning time travel, for the most part, remained unclear.
In the 25th century, time travel was mostly possible but still risky. ()
As of the 26th century, historians and anthropologists used time-pods to travel through time to observe historical events. ()
In the 29th century, the Federation had the ability to scan time as well as space, and travel back (and presumably forward) in time to attempt to fix issues and anomalies. ()
In the 31st century, time travel was commonplace. Federation temporal agents from this time became involved in a Temporal Cold War, which eventually led to the Temporal Wars. After these wars, time travel was banned and the technology used to travel in time was destroyed. (; ) However, some temporal weaponry, such as the Krenim chronophage, remained for sale on the black market. ()
=== Events ===
Crewman , a temporal agent from the 31st century, showed Jonathan Archer a group of time-traveling anthropologists from 2769 observing the building of the s of Giza. ()
In the 2230s, Section 31 created a special Red Angel time-traveling suit in response to Klingon time-traveling studies. This suit would use a special time crystal that created micro-wormholes to travel through time. A Klingon attack forced its test pilot, Gabrielle Burnham, to use it, bouncing throughout time. Section 31 thought the technology destroyed. ()
Time crystal-related technology was available outside of Federation oversight by late 2256, when Harry Mudd procured a time crystal-powered device that allowed him to rob a Betazoid bank and commandeer the , while repeatedly (and creatively) murdering her captain, . ()
The Discovery, after being transported to the mirror universe in late 2256 or early 2257 due to Captain 's machinations, returned to her original universe nine months later due to difficulties navigating the mycelial network. Her crew ended the shortly thereafter. ()
In 2258, the Discovery was transported via a time crystal-generated wormhole to 3188 in order to prevent Control from becoming sentient and destroying all life in the galaxy. ()
Captain Christopher Pike was transported via time crystal by his own future self to 2266 to witness the terrible future that would occur if Pike attempted to change his own fate. ()
The first experienced time travel in 2266, when an emergency cold start of its warp drive slingshot the ship and its crew seventy-one hours into the past. ()
In 2267, after an encounter with a black star, the Enterprise was hurled three hundred years into the past. Eventually, the Enterprises science officer Spock devised a method for returning the Enterprise back to its original period. ()
Later that year, officers Kirk, Spock, and McCoy traveled to Earth's early 20th century and back via the Guardian of Forever. ()
Sometime in 2268, the Enterprise traveled back in time, using the light-speed breakaway factor, to 1968, on a historical research mission. ()
In 2286, Admiral James T. Kirk and his senior staff took a stolen Klingon Bird-of-Prey back in time to the year 1986, to retrieve a pair of humpback whales, a species which was extinct by 2286, to save Earth from destruction by an alien probe. ()
In 2371, Captains Jean-Luc Picard and James T. Kirk used the Nexus as a means of controlled time travel, going to just before the destruction of the Veridian star, which Picard intended to save. (Picard arrived at the Nexus from just after the destruction of said star, whereas Kirk arrived from some seventy-eight years before.) ()
Data, unknowingly at first, traveled back in time to Earth 1893 while investigating an alien species that was later found to be ingesting the neural energy from Humans of that time period. The aliens acquired their sustenance by traveling through a portal back to that time and place from Devidia II, and were able to shield their presence from outsiders by being slightly out of temporal sync with everyone else, disguising their presence further by taking advantage of a local cholera outbreak. Picard, Riker, Crusher, La Forge, and Troi soon followed to retrieve Data and assess the situation. As the Enterprise crewmembers covertly endeavored to stop the aliens and return to their own time, Samuel Clemens was suspicious of them, and was accidentally sent to the 24th century with the Enterprise crewmembers (except Picard) when they used the alien portal to return to their own time. Clemens managed to go back through the portal and retrieve Picard, returning each man to his own time period before the Enterprise destroyed the aliens and their portal. ()
Twice, Q took Picard back in time. The first time was when Picard lay dying in a starbase medical facility during a replacement of a defective artificial heart that he had received as a result of a Nausicaan knife being stabbed through his heart immediately after Picard had graduated from Starfleet Academy on Starbase Earhart. () The other example was to the beginning of life on Earth, and also back and forth in Picard's lifetime. ()
During a transporter accident above Earth caused by chroniton particles being accidentally fused to the hull of the , Benjamin Sisko, Julian Bashir, and Jadzia Dax were sent back in time to the early-21st century, just before the Bell Riots. This caused the Federation and Starfleet to vanish in the present, after the time travelers' interference led to the death of Gabriel Bell before he would have played a crucial role in history. Only the Defiant was left protected by the chroniton particles. Sisko took on the identity of Gabriel Bell to ensure that he was remembered for saving hostages during the events, and ultimately allowing the Federation to come into being over a century later. ()
After becoming infected with delta-series radioisotopes following an accident aboard coupled with the presence of a cloaked Romulan warbird nearby, had the effect of shifting Miles O'Brien forward in time by several hours on multiple occasions. O'Brien's return to the present altered the course of the future events that he witnessed, allowing him to change his own fate. On his final jump into the future, a controlled one to learn what would cause the destruction of the station, O'Brien became too sick to jump back to his present and he was instead replaced by the Miles O'Brien of three and a half hours into the future. ()
While on a trip to Earth to take Nog to Starfleet Academy, Quark, Rom, Nog, and Odo were accidentally propelled back to circa 1950, crashing near Roswell, New Mexico, due to a sabotaged warp core on a ship that had been given to them by Quark's cousin . They managed to return to their own time using the reaction between kemocite and the radiation of a nuclear explosion on Earth. These events – which included Quark attempting to alter the timeline by selling goods to the United States of America during the Cold War, and the Ferengi subsequently being interrogated on the suspicion that they were secretly planning an invasion – were kept secret from the public on Earth at the time. ()
Akorem Laan, a poet and seer from Bajor's past (whom history had recorded had mysteriously disappeared) was sent to the future by the Prophets, believing he was the Emissary of the Prophets. Ultimately, Sisko convinced the Prophets to send Laan back into his own period. Laan later went on to finish one of his prophetic poems, which Major Kira remembered as unfinished, after Laan had disappeared. Sisko pointed out that the ending of the poem had appeared in databases, along with new history of his life after his return to Bajor. Although Kira wondered why she could remember the previous timeline if that timeline had been wiped out, Sisko commented that time worked in mysterious ways whenever the Prophets were involved. ()
Quinn took the back in time to the Big Bang to hide from Q. ()
In 2373, the , commanded by Captain Sisko, traveled back in time to 2268 via the Bajoran Orb of Time, in an attempt by Arne Darvin to kill James T. Kirk and change the timeline. The crew of the Defiant stopped Darvin without any notable damage. Major Kira found a way to use the Orb to get the Defiant and its crew back to their own time. ()
In 2373, around Stardate 50814.2, the Defiant became stuck behind a barrier on a planet in the Gamma Quadrant, where the ship's crew met inhabitants of the planet, who told them they were actually descendants of the Defiant crewmembers themselves and that, in two days, the crew would be sent two hundred years into the past and crash on the planet. With foreknowledge of the crash, the crew surmised that, if they escaped that fate, the timeline would collapse and everything on the planet would cease to exist. A descendant of Jadzia Dax, Yedrin, surmised that it would be possible to save their colony, due to an energy discharge that had hit Major Kira, which had created a subspace doubling effect and, for an instant, created corresponding quantum duplicates of every molecule in her body. By amplifying the doubling effect through modifications to the Defiant, they could make a quantum duplicate of the entire ship, and this second ship would then be the one that would crash on the planet, preserving the original timeline. However, the other Defiant would be able to escape as well. Yedrin, though, had falsified information in his plan, with the intent of making sure that the original (un-duplicated) single Defiant would crash on the planet, thus ensuring that the colony would continue to exist. The Defiant crewmembers ultimately made the decision to sacrifice their ship by flying into the temporal anomaly, in order to save the eight thousand colony members. However, the ship's flight plan was changed, by a version of Odo who lived on the colony, so that it would clear the barrier, the future Odo wanting to save Kira's life. This erased the settlement and all of its inhabitants from the planet. ()
Kira used the Orb of Time to learn about her mother's life on Terok Nor. Before she began her Orb experience, she was warned not to interfere with the timeline by Sisko. Kira nearly assassinated her own mother and Dukat, but changed her mind at the last moment. The Orb then returned her to the present. ()
During a visit to the planet Golana with her family, Molly O'Brien was accidentally sent three hundred years into the past via a time portal created by a long-lost civilization that had once inhabited the planet. She was retrieved by her parents, but was now a teenager reduced to a feral mindset, forcing them to use the portal to send her back. However, their subsequent use of the portal sent the teenage Molly back to shortly after her past self arrived in the past in the first place, allowing her to send her past self back to the present. Shortly after saving the younger Molly, the older Molly ceased to exist, vanishing from existence as the timeline corrected itself. ()
Also in 2373, an encounter with the 29th century timeship Aeon threw Voyager back to 1996, while the Aeon crash-landed in 1967 and was discovered by Henry Starling, who used its future technology to make himself rich. History was corrected when Captain Janeway destroyed the timeship before it could travel to the future and accidentally cause a temporal explosion. Voyager was returned to the correct time by an alternate version of the Aeon from the correct timeline. ()
An alternate future version of Janeway (from 2404) traveled back to 2378 through the use of a chrono deflector, to bring Voyager home from the Delta Quadrant sixteen years earlier than it had arrived in that alternate future. This future Janeway was killed in the attempt but succeeded in returning Voyager home and even delivered a crippling blow to the Borg, () leaving them on the very edge of extinction. ()
In 2381, Ensign Brad Boimler was accidentally sent back to 2259 by the Krulmuth-B portal on Krulmuth-B when fellow ensign Sam Rutherford accidentally activated it with his camera, putting him in the care of Captain Pike and his crew of the Enterprise. Their attempts to return Boimler to the future were complicated by various incidents, including Beckett Mariner throwing herself through the portal, Orion scientists stealing the portal and the need to find a source of horonium to power the portal. ()
In 2382, the fell through a wormhole to the Solum of 2436. The Vau N'Akat, blaming the Federation for the destruction of their homeworld in a devastating civil war, plotted to travel back in time to destroy the Federation before the war could occur, placing a living construct on the Protostar. However, Captain Chakotay managed to launch his ship back through the wormhole on autopilot and it landed on Tars Lamora at some point in the past. The Order followed the ship through, but only the Diviner and the Vindicator survived the journey before the wormhole collapsed. ()
In 2384, Janeway intended to use the wormhole opened by the destruction of the Protostar to rescue Chakotay from the future. The was specially built to survive the journey and avoid detection once in the future. However, Dal R'El, Jankom Pog, Zero, and Maj'el's intervention accidentally resulted in Chakotay and Adreek-Hu escaping with the ship, causing the Protostar to not go back to Tars Lamora, changing history and creating a temporal paradox that threatened to destroy the prime universe. () Chakotay, Adreek and the Protostar arrived in 2374 where the two purposefully stranded the ship on Ysida where it remained for the next ten years. () The paradox that this created was so bad that the Travelers believed that it was impossible to fix and abandoned the universe to its destruction aside from Wesley Crusher. It also caused the Loom -- extra-dimensional creatures that devoured dying timelines -- to begin an assault on the universe. ()
Using an inverse warp field powered by energy from the wormhole, Dal, Jankom, Zero, and Maj'el were able to turn the Infinity into a time machine, transporting themselves from 2436 Solum to 2384 Solum. ()
In order to fix the paradox, Dal, Jankom and Murf used Asencia's temporal technology that she had developed under the manipulation of Wesley to open a wormhole to Tars Lamora in the past. With the help of the , the Protostars crew flew the ship into the wormhole before setting it on autopilot and having Voyager beam them out. The Protostar arrived at Tars Lamora at an unknown point in the past and remained there until it was found by Dal and Rok in 2383, repairing the timeline, ending the paradox and causing the Loom to depart from the universe. The alterations to the timeline also created a new more peaceful future for Solum, averting the destruction of the planet in a civil war. ()
In 2387, Nero and Spock were sent back in time through a red matter black hole which had prevented a supernova from destroying the galaxy (but not before it had destroyed Romulus in the process). Nero was sent back to the past to 2233, inadvertently creating a new spacetime continuum where he destroyed the . He and his crew then went into hiding for twenty-five years, awaiting Spock's arrival. Spock arrived in Nero's new timeline in 2258. Nero destroyed , while Spock watched from . The crew of the , with the help of , stopped Nero from destroying Earth. ()
In 2401, Q transported Picard, Elnor, Seven of Nine, Agnes Jurati, Cristóbal Rios and Raffaela Musiker into an alternate timeline where Earth was now the Confederation of Earth () due to Q's own meddling in the past. With the help of an alternate Borg Queen, the group used the slingshot effect to travel back in time to 2024 in order to right history. () Q later returned the group, minus Rios and Jurati, to 2401 using his own powers at the cost of Q's life due to his weakened state. The group was returned to just moments before they had left, giving them the opportunity to alter their own future slightly. ()
=== Temporal Cold War and Temporal Wars ===
The events of the Temporal Cold War further complicated the understanding of Federation time travel capabilities.
As of the 28th century, a time-traveling faction, represented by a mysterious individual, could only communicate and exchange information and technologies through time, appearing as non-corporeal entities. By the 29th century, this technology was perfected to allow physical travel.
According to a Temporal Enforcement Agent from the 31st century named "Daniels", all time travelers were bound by the observance of strict procedures set forth in the Temporal Accords. Daniels stated that the Temporal Accords were enacted after time travel was developed by all time-travel-capable species to prevent catastrophic tampering with the timeline.
In 2153, the Sphere-Builders, a group previously thought to possess the ability only to examine alternate timelines, sent Xindi-Reptilians back to 21st-century Detroit to develop a bio-weapon to destroy the Human race. ()
Ultimately, the war ended when the Na'kuhl returned from an alternate 1944 (created by their very actions) and caused the Cold War to become a war with time travelers changing time as they liked. Daniels brought Enterprise and Archer back to 1944 to stop Vosk, leader of the Na'kuhl, from returning to the future. With the help of Silik, a member of another faction of the Temporal Cold War, Archer shut off Vosk's compound's shields, allowing Enterprise to destroy it and thus destroying the temporal conduit and killing Vosk, just as he was about to travel back to the future. Daniels pulled Archer to a place where they watched the time stream, as all of the events that had occurred while the Temporal War had been ongoing were undone and time reset itself to normal. Archer refused to have anything more to do with Daniels' "damn Temporal Cold War" and Daniels agreed, claiming it was finally coming to an end thanks to Archer's actions. ()
According to Romulan temporal agent Sera, whole Temporal Wars were fought over the existence of Khan Noonien Singh. However, this just resulted in the events surrounding Khan getting pushed back from the 20th century to the 21st century. In an alternate timeline that was created from this revised timeline, Sera succeeded in assassinating Khan in 2022. As a result, a dark future for Humanity emerged in which Earth was nearly uninhabitable, Starfleet and the Federation never formed, and the Romulan Star Empire was the dominant force of the region. However, Sera was stopped by La'an Noonien-Singh with the help of an alternate James T. Kirk after La'an -- herself a descendant of Khan -- was directed to return to the past by a dying Department of Temporal Investigations agent. ()
After the Temporal Wars, time travel was banned, and its technology destroyed. () However, leftover technology from the Temporal Wars such as Krenim chronophages -- also known as time bugs -- could be found for sale on the black market as late as 3191. ()
In 3189, after started to die from being separated from her own time and the mirror universe for so long, the crew of the temporally-displaced sought help from a being who turned out to be the embodiment of the Guardian of Forever. After testing Georgiou and Michael Burnham, the Guardian of Forever sent Georgiou back to a time when the two universes were still aligned and thus she could survive. ()
In 3191, the mysterious Doctor Kovich turned out to be a future version of Daniels who possessed artifacts from various eras in his office. When Kovich introduced himself to Michael Burnham as Daniels, he said that he was Agent Daniels of the Enterprise "and other places." ()
== Opinions on time travel ==
Neelix believed that food could be like time travel; in his own words, "You inhale an aroma, take a bite of something and suddenly, bam! You're back at the moment you first tasted it." ()
When Captain Jonathan Archer saw an old clipper ship on an ocean on the Akaali homeworld, he noted that it was almost like "traveling back in time." ()
== Methods ==
* Black hole created by red matter
* Chrono deflector
* Nexus
* Orb of Time
* superpowers
* Red Angel suit using a time crystal
* Slingshot effect (Light-speed breakaway factor)
* Temporal causality loop
* Temporal conduit
* Temporal transporter
* Temporal vortex
* Time portal
* Timeships
* Wormholes
== Appendices ==
=== See also ===
* Department of Temporal Investigations
* Janeway Factor
* Temporal anomaly
* Temporal Integrity Commission
* Temporal Prime Directive
=== Background information ===
A list of episodes that feature time travel.
Episode	Departure 	Destination 	Time travelers 	Method
 	2266 	2266 (three days in the past) 	with crew 	cold start
 	Alternate 2266 	2266 (prime timeline) 	with crew 	Unknown (presumably occurred after events of episode)
 	2267 	1969 	with crew 	slingshot effect
 	Alternate 1969 	earlier in 1969 (prime timeline) 	with crew, John Christopher, and an air police staff sergeant 	slingshot effect
 	Alternate 1969 	2267 (prime timeline) 	with crew 	slingshot effect
 	2267 	1930 	Leonard McCoy 	Guardian of Forever
 	2267 	Alternate 2267 	James T. Kirk, Spock, Montgomery Scott, Nyota Uhura, Galloway, Guardian of Forever, and a security officer 	Guardian of Forever
 	Alternate 2267 	1930 	James T. Kirk and Spock 	Guardian of Forever
 	Alternate 2267 	2267 (prime timeline) 	Montgomery Scott, Nyota Uhura, Galloway, Guardian of Forever, and a security officer 	Guardian of Forever
 	Alternate 1930 	2267 (prime timeline) 	James T. Kirk, Spock, and Leonard McCoy 	Guardian of Forever
 	2268 	1968 	with crew 	slingshot effect
 	Alternate 1968 	2268 	with crew 	slingshot effect
 	2269 	Unspecified past time period 	James T. Kirk 	atavachron
 	2269 	c. 2700 BC 	Spock and Leonard McCoy 	atavachron
 	Unspecified past time period 	2269 	James T. Kirk 	atavachron
 	c. Alternate 2700 BC 	2269 (prime timeline) 	Spock and Leonard McCoy 	atavachron
 	2269 	Unspecified past time period 	Atoz 	atavachron
 	In addition, it is mentioned that the entire populace of Sarpeidon (including the Prosecutor) as well as many others in the centuries beforehand (including Zarabeth and her family) had previously used the atavachron to travel to the past.	In addition, it is mentioned that the entire populace of Sarpeidon (including the Prosecutor) as well as many others in the centuries beforehand (including Zarabeth and her family) had previously used the atavachron to travel to the past.	In addition, it is mentioned that the entire populace of Sarpeidon (including the Prosecutor) as well as many others in the centuries beforehand (including Zarabeth and her family) had previously used the atavachron to travel to the past.	In addition, it is mentioned that the entire populace of Sarpeidon (including the Prosecutor) as well as many others in the centuries beforehand (including Zarabeth and her family) had previously used the atavachron to travel to the past.
 	2269 	Unspecified past time period 	James T. Kirk, Spock, and Erickson 	Guardian of Forever
 	Unspecified past time period 	2269 	James T. Kirk, Spock, and Erickson 	Guardian of Forever
 	2269 	2237 	Spock 	Guardian of Forever
 	2237 	2269 	Spock 	Guardian of Forever
 	2286 	1986 	with crew 	slingshot effect
 	Alternate 1986 	2286 (prime timeline) 	with crew, Gillian Taylor, George, and Gracie 	slingshot effect
 	The (as well as the , the Coltar IV colony, and the Ilecom system) experiences several short time loops (the Manheim Effect) in this episode caused by a "window" into another dimension. 	The (as well as the , the Coltar IV colony, and the Ilecom system) experiences several short time loops (the Manheim Effect) in this episode caused by a "window" into another dimension. 	The (as well as the , the Coltar IV colony, and the Ilecom system) experiences several short time loops (the Manheim Effect) in this episode caused by a "window" into another dimension. 	The (as well as the , the Coltar IV colony, and the Ilecom system) experiences several short time loops (the Manheim Effect) in this episode caused by a "window" into another dimension.
 	2365 	6 hours earlier in 2365 	Jean-Luc Picard (aboard the shuttlepod El-Baz) 	energy vortex
 	2366 	2344 	Various particles floating through space (presumably) 	temporal rift
 	Alternate 2344 	2366 (prime timeline) 	with crew 	temporal rift
 	2366 (prime timeline, altered through unknown means to appear as an alternate timeline where the disappeared through a vortex) 	Alternate 2344 	with crew and Alternate/resurrected Natasha Yar 	temporal rift
 	27th century 	22nd century 	Kal Dano 	unknown
 	27th century 	2367 	Ajur and Boratus 	Vorgon technology
 	26th century 	22nd century 	Unknown male (aboard a time-pod) 	temporal distortion
 	22nd century 	2368 	Berlinghoff Rasmussen (aboard a time-pod) 	temporal distortion
 	2368 	22nd century 	A time-pod 	temporal distortion
 	2278 	2368 	with crew 	temporal distortion
 	2368 	1893 	Two Unnamed Devidians and Data 	temporal vortex
 	1893 	2368 	Two Unnamed Devidians 	temporal vortex
 	2368 	1893 	Two Unnamed Devidians, Jean-Luc Picard, William T. Riker, Deanna Troi, Geordi La Forge, and Beverly Crusher 	temporal vortex
 	The two Devidians apparently made many trips before and perhaps during the episode to 1893 that were not shown, via temporal vortex. 	The two Devidians apparently made many trips before and perhaps during the episode to 1893 that were not shown, via temporal vortex. 	The two Devidians apparently made many trips before and perhaps during the episode to 1893 that were not shown, via temporal vortex. 	The two Devidians apparently made many trips before and perhaps during the episode to 1893 that were not shown, via temporal vortex.
 	1893 	2368 	male Devidian, William T. Riker, Deanna Troi, Geordi La Forge, Beverly Crusher, Samuel Clemens, and Data's headless body 	temporal vortex
 	2368 	1893 	Samuel Clemens 	temporal vortex
 	1893 	2368 	Jean-Luc Picard 	temporal vortex
 	2369 	2327 	Jean-Luc Picard's consciousness and Q 	powers
 	2327 	2369 	Jean-Luc Picard's consciousness and Q 	powers
 	2369 	2327 	Jean-Luc Picard's consciousness and Q 	powers
 	2327 	2369 	Jean-Luc Picard's consciousness and Q 	powers
 	Picard thought the time travel may have been an illusion created by Q. 	Picard thought the time travel may have been an illusion created by Q. 	Picard thought the time travel may have been an illusion created by Q. 	Picard thought the time travel may have been an illusion created by Q.
 	Time is slowed considerably before being reversed due to being trapped in a temporal fragment. Both the and a Romulan warbird were trapped, and a runabout with Jean-Luc Picard, Deanna Troi, Geordi La Forge, and Data entered the fragment.	Time is slowed considerably before being reversed due to being trapped in a temporal fragment. Both the and a Romulan warbird were trapped, and a runabout with Jean-Luc Picard, Deanna Troi, Geordi La Forge, and Data entered the fragment.	Time is slowed considerably before being reversed due to being trapped in a temporal fragment. Both the and a Romulan warbird were trapped, and a runabout with Jean-Luc Picard, Deanna Troi, Geordi La Forge, and Data entered the fragment.	Time is slowed considerably before being reversed due to being trapped in a temporal fragment. Both the and a Romulan warbird were trapped, and a runabout with Jean-Luc Picard, Deanna Troi, Geordi La Forge, and Data entered the fragment.
 	~2410 	2370 	Alexander Rozhenko 	unknown
 	2370 	~2410 	Alexander Rozhenko 	unknown
 	2370 	multiple jumps between to and from an alternate 2364, an alternate 2370 and an alternate future 	Jean-Luc Picard's consciousness 	powers
 	alternate 2370 	alternate 3.5 billion years ago 	Jean-Luc Picard and Q 	powers
 	alternate 3.5 billion years ago 	alternate 2364 	Jean-Luc Picard's consciousness 	powers
 	It is unknown how many trips Picard made before he became aware of it (his memory was getting better with each trip). 	It is unknown how many trips Picard made before he became aware of it (his memory was getting better with each trip). 	It is unknown how many trips Picard made before he became aware of it (his memory was getting better with each trip). 	It is unknown how many trips Picard made before he became aware of it (his memory was getting better with each trip).
 	2293 	2371 	James T. Kirk 	Nexus
 	2371 	earlier in 2371 	Jean-Luc Picard 	nexus
 	2373 	2063 	Borg sphere and crew (including the Borg Queen) 	temporal vortex
 	2373 	Alternate 2373 	and crew 	Side effect of Borg traveling back through temporal vortex
 	Alternate 2373 	2063 	and crew 	temporal vortex
 	Alternate 2063 	2373 (prime timeline) 	and crew 	temporal vortex
 	2371 	2024 	Julian Bashir, Jadzia Dax, and Benjamin Sisko 	transporter malfunction
 	2371 	1930 	Kira Nerys and Miles O'Brien 	simulated transporter malfunction
 	1930 	2371 	Kira Nerys and Miles O'Brien 	simulated transporter malfunction
 	2371 	1967 	Kira Nerys and Miles O'Brien 	simulated transporter malfunction
 	1967 	2371 	Kira Nerys and Miles O'Brien 	simulated transporter malfunction
 	2371 	2048 	Kira Nerys and Miles O'Brien 	simulated transporter malfunction
 	2048 	2371 	Kira Nerys and Miles O'Brien 	simulated transporter malfunction
 	2371 	2024 	Kira Nerys and Miles O'Brien 	simulated transporter malfunction
 	2024 	2371 	Julian Bashir, Jadzia Dax, Kira Nerys, Miles O'Brien, and Benjamin Sisko 	simulated transporter malfunction
 	2371 	2371 (five hours later) 	Miles O'Brien 	temporal displacement
 	2371 	2371 (five hours before) 	Miles O'Brien 	temporal displacement
 	2371 	2371 (five hours later) 	Miles O'Brien 	temporal displacement
 	2371 	2371 (five hours before) 	Miles O'Brien 	temporal displacement
 	2371 	2371 (five hours later) 	Miles O'Brien 	temporal displacement
 	2371 	2371 (five hours before) 	Miles O'Brien 	temporal displacement
 	2371 	2371 (five hours later) 	Miles O'Brien 	temporal displacement
 	2371 	2371 (five hours before) 	Miles O'Brien 	temporal displacement
 	2371 	2371 (five hours later) 	Miles O'Brien 	temporal displacement
 	2371 	2371 (five hours before) 	Miles O'Brien 	temporal displacement
 	2371 	2371 (three and a half hours later) 	Miles O'Brien 	temporal displacement
 	2371 	2371 (three and a half hours before) 	Miles O'Brien (future version) 	temporal displacement
 	2372 	2372 (few months later) 	Benjamin Sisko 	temporal displacement
 	2372 	2373 	Benjamin Sisko 	temporal displacement
 	2373 	2389 	Benjamin Sisko 	temporal displacement
 	2389 	2408 	Benjamin Sisko 	temporal displacement
 	2408 	2422 	Benjamin Sisko 	temporal displacement
 	2422 	2450 	Benjamin Sisko 	temporal displacement
 	2450 	2372 	Benjamin Sisko 	temporal displacement
 	2372 	1947 	Quark's Treasure with crew (Nog, Odo, Quark, and Rom) 	time warp
 	1947 	2372 	Quark's Treasure with crew (Nog, Odo, Quark, and Rom) 	time warp
 	22nd century 	2372 	Akorem Laan (aboard his lightship) 	Prophet ability
 	2372 	22nd century 	Akorem Laan (aboard his lightship) 	Prophet ability
 	2373 	2268 	with crew and Arne Darvin 	Orb of Time
 	2268 	2373 	with crew and Arne Darvin 	Orb of Time
 	2373 	22nd century 	(alternate) with crew 	energy barrier
 	2374 	2346 	Kira Nerys 	Orb of Time
 	2346 	2374 	Kira Nerys 	Orb of Time
 	2374 	21st century 	Molly O'Brien 	time portal
 	21st century (ten years later) 	2374 	Molly O'Brien 	time portal
 	2374 	21st century 	Molly O'Brien 	time portal
 	21st century 	2374 	Molly O'Brien (young version) 	time portal
 	2371 	2374 	Lisa Cusak's distress call and subsequent transmissions 	metreon radiation
 	2374 	2371 	response transmissions 	metreon radiation
 	2371 	2371 a short time before 	Kathryn Janeway and B'Elanna Torres 	event horizon of a quantum singularity
 	2371 	2371 (about a day before) 	Kathryn Janeway and Tom Paris 	subspace fractures
 	2371 	2351 	test cylinder 	Micro-wormhole
 	2351 	2371 	Telek R'Mor 	Micro-wormhole
 	2371 	2351 	Telek R'Mor 	Micro-wormhole
 	2372 	Big Bang 	with crew and Quinn 	Quinn's power
 	2372 	Big Bang 	Q 	Q's power
 	Big Bang 	2372 	with crew, Q, and Quinn 	Q's power
 	29th century 	2373 	Timeship Aeon and Captain Braxton 	The Aeons temporal matrix creating a temporal rift
 	2373 	1996 	and crew 	destabilized temporal rift
 	2373 	1967 	Timeship Aeon and Captain Braxton 	destabilized temporal rift
 	29th century 	1996 	Timeship Aeon and Captain Braxton 	The Aeons temporal matrix creating a temporal rift
 	1996 	2373 	and crew, Timeship Aeon and Captain Braxton 	The Aeons temporal matrix creating a temporal rift
 	2373 	29th century 	Timeship Aeon and Captain Braxton 	The Aeons temporal matrix creating a temporal rift
 	2379 	2379 (weeks earlier) 	Kes 	temporal flux created by a bio-temporal chamber
 	2379 	2379 (weeks earlier) 	Kes 	temporal flux created by a bio-temporal chamber
 	2379 	2379 (months earlier) 	Kes 	temporal flux created by a bio-temporal chamber
 	2379 	2378 	Kes 	temporal flux created by a bio-temporal chamber
 	2378 	unknown (years earlier) 	Kes 	temporal flux created by a bio-temporal chamber
 	unknown 	2374 	Kes 	temporal flux created by a bio-temporal chamber
 	2374 	2373 	Kes 	temporal flux created by a bio-temporal chamber
 	2373 	2371 	Kes 	temporal flux created by a bio-temporal chamber
 	2371 	2369 	Kes 	temporal flux created by a bio-temporal chamber
 	2369 	unknown (months earlier) 	Kes 	temporal flux created by a bio-temporal chamber
 	unknown 	unknown (months earlier) 	Kes 	temporal flux created by a bio-temporal chamber
 	unknown 	2373 	Kes 	temporal flux created by a bio-temporal chamber
 	2390 	2375 	phase calculations and a letter 	temporal transmitter
 	2375 	29th century 	Seven of Nine 	temporal transporters
 	29th century 	2372 	Seven of Nine 	temporal transporters
 	29th century 	2372 	Captain Braxton 	temporal transporters
 	2372 	2371 	Seven of Nine and Captain Braxton 	temporal transporters
 	2371 	2375 	Seven of Nine and Captain Braxton 	temporal transporters
 	2375 	29th century 	a different Seven of Nine, Captain Braxton and Kathryn Janeway 	temporal transporters
 	29th century 	2372 	Kathryn Janeway 	temporal transporters
 	2372 	29th century 	Kathryn Janeway and another Captain Braxton 	temporal transporters
 	29th century 	2375 	Kathryn Janeway and Seven of Nine 	temporal transporters
 	2376 	2371 	Kes 	energy surge in 's warp core, created by Kes
 	2377 	late 2372 	Chakotay 	temporal rift
 	late 2372 	2371 	Chakotay 	temporal rift
 	2371 	early 2372 	Chakotay 	temporal rift
 	early 2372 	late 2372 	Chakotay 	temporal rift
 	late 2372 	2371 	Chakotay 	temporal rift
 	2371 	2375 	Kathryn Janeway and Chakotay 	temporal rift
 	2375 	2373 	Kathryn Janeway and Chakotay 	temporal rift
 	2373 	2394 	Kathryn Janeway and Chakotay 	temporal rift
 	2394 	2374 	Kathryn Janeway and Chakotay 	temporal rift
 	2374 	late 2372 	Kathryn Janeway and Chakotay 	temporal rift
 	late 2372 	2373 	Kathryn Janeway and Chakotay 	temporal rift
 	2373 	2375 	Kathryn Janeway and Chakotay 	temporal rift
 	2375 	2371 	Kathryn Janeway and Chakotay 	temporal rift
 	2371 	2377 	Kathryn Janeway and Chakotay 	temporal rift
 	2377 	early 2372 	Kathryn Janeway, Chakotay and Tom Paris 	temporal rift
 	2371 	early 2372 	Harry Kim, B'Elanna Torres and Ayala 	temporal rift
 	2374 	early 2372 	Seven of Nine 	temporal rift
 	2394 	early 2372 	Adult Icheb and Adult Naomi Wildman 	temporal rift
 	early 2372 	2377 	Chakotay 	temporal rift
 	2404 	2378 	The SC-4 and Admiral Kathryn Janeway 	chrono deflector
 	31st century 	2151 	 	time portal
 	2152 	2152 (ten months in the past) 	Jonathan Archer 	time portal
 	2152 	31st century 	Jonathan Archer and 	time portal
 	31st century 	2152 	Jonathan Archer 	temporal chamber
 	2152 	2152 (few minutes in the past) 	Charles Tucker III and Malcolm Reed 	temporal radiation
 	2152 	2152 (few minutes in the past) 	Charles Tucker III and Malcolm Reed 	temporal radiation
 	2152 	2152 (few minutes in the past) 	Jonathan Archer and Malcolm Reed 	temporal radiation
 	2152 	2152 (few minutes in the past) 	Jonathan Archer and Malcolm Reed 	temporal radiation
 	2153 	2004 	Jonathan Archer and T'Pol 	time portal
 	2004 	2153 	Jonathan Archer, T'Pol, Damron, and a Xindi-Reptilian guard 	time portal
 	2153 	26th century (possible timeline) 	Jonathan Archer and 	time portal
 	26th century (possible timeline) 	2153 	Jonathan Archer 	time portal
 	2154 	2037 	and crew 	subspace corridor
 	2154 	2161 	Jonathan Archer and 	time portal
 	2161 	2154 	Jonathan Archer 	time portal
 	2154 	1944 	, her crew, and 	time portal
and 	1944 	2154 	and crew 	time portal
 	2387 	2233 	Narada and crew 	black hole
 	2387 	2258 	and Spock 	black hole
 	2256 	2256 (30 minutes earlier; unspecified number of occasions) 	Harry Mudd 	time crystal
 	2257 	Nine months later in 2257 	and crew 	mycelial network
 	32nd century 	2257 	Gabrielle Burnham 	Red Angel
 	2236 	32nd century 	Gabrielle Burnham 	Red Angel
 	2257 	32nd century 	Gabrielle Burnham 	Red Angel
 	2257 	Various points throughout 2257 	Michael Burnham 	Red Angel
 	2258 	32nd century 	Michael Burnham, , and crew 	Red Angel
 	3188 	2258 	Red angel suit 	Red Angel
 	3189 	2255 (mirror universe) 	Philippa Georgiou (mirror) 	Guardian of Forever
 	2255 (mirror universe) 	3189 	Philippa Georgiou (mirror) 	Guardian of Forever
 	3189 	24th century 	Philippa Georgiou (mirror) 	Guardian of Forever
 	Alternate 2401 	2024 	Crew of the 	slingshot effect
 	2024 	2401 	Jean-Luc Picard, Raffaela Musiker, Seven of Nine and Elnor 	Q's powers
 	Unknown time after alternate 2266 	2259 	Alternate Christopher Pike 	time crystal
 	2259 	Alternate 2266 	Christopher Pike 	time crystal
 	Alternate 2266 	2259 	Christopher Pike 	time crystal
 	2381 	2259 	Bradward Boimler and Beckett Mariner 	Krulmuth-B portal
 	3191 	2258 	Michael Burnham, Rayner and Paul Stamets 	time cycling of the due to a time bug
 	2258 	2256 	Michael Burnham, Rayner and Paul Stamets 	time cycling of the due to a time bug
 	2256 	2258 	Michael Burnham, Rayner and Paul Stamets 	time cycling of the due to a time bug
 	2258 	3189 	Michael Burnham, Rayner and Paul Stamets 	time cycling of the due to a time bug
 	3189 	3218 	Michael Burnham, and Rayner 	time cycling of the due to a time bug
 	3218 	3189 	Michael Burnham, Rayner, and Paul Stamets 	time cycling of the due to a time bug
 	3189 	3189 (a different date) 	Michael Burnham, Rayner, and Paul Stamets 	time cycling of the due to a time bug
 	3189 	2256 	Michael Burnham, Rayner, and Paul Stamets 	time cycling of the due to a time bug
 	2256 	3191 	Michael Burnham, Rayner, and Paul Stamets 	end of time cycling of the following the removal of a time bug
, , , ,	2382 	2436 	and crew 	falling into an unstable wormhole
, , , ,	2436 	Unknown time previous to 2366 	 	sent back through the wormhole on autopilot by Chakotay
 	2436 	Around 2363 and 2381 	The Order, although only the Diviner and the Vindicator survived the trip 	wormhole
 	2384 	2436 	, Dal R'El, Jankom Pog, Zero and Maj'el 	Janeway wormhole
 	2436 	2374 	, Chakotay and Adreek-Hu 	Protostar flown through the wormhole by Chakotay and Adreek
 	2436 	2384 	, Dal R'El, Jankom Pog, Zero and Maj'el 	inverse warp field powered by energy drawn from a temporal anomaly
 	2385 	Unknown time prior to 2366 	 	flown through a wormhole and then set on autopilot to finish the journey
=== Apocrypha ===
In the , Captain Spock embarked incognito aboard a Klingon ore transport, refitted with time travel capacity. The ore transport managed to go back to 1867 Earth after an acceleration close to a white dwarf near Starbase 12. The was modified to follow the ship to 1867, becoming the first instance that a Federation ship utilized intentional and controlled time travel.
In the video game Star Trek: The Next Generation - Future's Past for the Super Nintendo, the computer mentions several temporal near-catastrophes in the 23rd century: the New York incident, the above-mentioned "Ishmael incident", and the "Eyeglass Loop Paradox" referring to what Kirk does in with his glasses.
The novel trilogy Star Trek: Deep Space Nine - Millennium features the Defiant inadvertently travelling twenty-five years into the future when they slingshot around a newly-formed red wormhole. Upon arriving in the future, Dax explains that time-travel leavers the travellers molecularly out of sync with the local time period in a manner that can only be averted if they either exactly repeat and reverse the process that sent them through time in the first place or if they travel in the opposite direction of their original trip by a considerably greater distance (in this case, it was suggested that the Defiant crew could travel back in time 25 000 years). It is left unclear what would happen if someone tried to go back in time via a different method- the use of the Orb of Time is suggested as one such method that could be used- but it is generally agreed that such an attempt either wouldn't work or prove unpleasantly fatal to the time traveller.
The Department of Temporal Investigations novels Watching the Clock and Forgotten History go into detail about the principles of time travel, as well as the hows and whys of the various time travel incidents in Star Treks history. The most significant of these demonstrates how Starfleet became aware that history could change – previously, the organization had assumed that changing history just created an alternate timeline that those who changed history happened to get 'stuck' in-; when the DTI created Timeship One with the intention of deliberately traveling three days into the future, a future version of the ship appeared in their time thirty-two hours before it was due to launch, the crew all dead or dying from an accident that had occurred when they overshot. With this discovery postponing the planned launch, the future Timeship One and its crew disappeared once the time of the original launch had passed, confirming that history could be changed.
== External links ==
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Category:Events