Time travel features in over 50 episodes of Star Trek and in four of the movies, making it one of the franchise's most commonly used storytelling mechanics. This list includes all episodes the television series and the movies with time travel plots, from the original series through to 'The Next Generation', 'Deep Space Nine' and 'Voyager', as well as the movies and the latest incarnation, 'Discovery'.
Star Trek: The Original Series
Star Trek IV: The Voyage Home
Star Trek: The Next Generation
While on shore leave, Captain Picard is visited by an unknown alien race from the future, who are in search of a dangerous weapons in his time frame.
The Enterprise encounters a strange unknown vessel, which appears after a temporal distortion, it's transporting Berlingoff Rasmussen. He claims to be from Earth three centuries later who has traveled back in time to experience history. He's quite convincing and while he is definitely a time traveler his story isn't quite accurate.
The Enterprise gets caught in a time loop which always has one result: total destruction of the ship itself.
In this two-part episode, Captain Picard and his archaeological curiosity are called upon by scientists from Earth when they find evidence to support beliefs that aliens had visited Earth in the late 1800s. Data is accidentally pulled back through time to this period. The crew are forced to follow him back to the late 1800s to get him back, only to find the suspected alien visitors killing people of that time.
When Captain Picard's artificial heart fails, he is offered the rare opportunity by Q to go back in time and set right the mistake that lead to his demise.
Aboard a shuttlecraft and en route back to the Enterprise, Picard, LaForge, Data, and Troi find themselves trapped in a time trap of some sort, where the Enterprise is being taken over by Romulans, and the ship, itself, on a course of destruction.
In the final ever TNG episode, Captain Picard finds himself shifting continually into the past, future and present and must use that to discover a threat to humanity's existence.
Star Trek Generations
Star Trek: First Contact
Star Trek: Deep Space Nine
Quark and Rom take Nog to Earth and Starfleet Academy, but a malfunction with the ship takes the crew back in time, to Roswell, New Mexico in 1947.
Sisko tells two men from Temporal Investigations how he and his crew went back in time to when Captain James Kirk of the first Starship Enterprise exposed a Klingon spy with the help of Tribbles.
The DS9 crew discovers a small colony on a remote world that was originally populated by them 200 years earlier due to a time travel accident with the Defiant. The current colonists lives depend on making sure that accident happens again, even though they've now forewarned the crew that it will happen.
After receiving some disturbing information from Gul Dukat, Major Kira seeks Sisko's approval as Emissary to travel back in time to find out the truth about her mother.
Chief O'Brien and Keiko's daughter gets caught in a time displacement and when they get her back, she is considerably older.
As the Defiant races to a shipwrecked officer who is days away, the crew keeps in contact with her, but when they finally reach her location they find that the distress call she sent had been time-shifted from the past and she was in fact already dead.
Star Trek: Voyager
Tensions rise between the merged Starfleet and Maquis crews when they find another ship caught within a quantum singularity. After establishing communications with the craft they discover the ship in distress is Voyager itself.
The Voyager crew discovers a planet which recently suffered a horrific catastrophe. Upon investigation, Janeway and Paris are sent back in time before the disaster and are faced with the decision of whether to try to stop it.
When the Voyager crew encounters a wormhole and makes contact with a Romulan ship on the other side in the Alpha Quadrant. It raises the crew's hopes of getting back to Earth, until they realise that the other ship is from 54 years in Voyager's past.
Starting near her death with no memory, Kes experiences parts of her life moving backwards through time. We see a possible future Voyager where Janeway and Torres died years ago in a great war and the survivors of Voyager were exposed to temporal radiation. When the cycle takes Kes back to an embryo, the cycle begins again in the correct order, stopping at present day, leaving Kes with all the memories of the possible future and valuable knowledge of the upcoming war that will be known as "the year of hell."
Voyager comes across a Krenim timeship that is wiping whole species from existence by changing the existing timeline.
A miscalculation by Ensign Kim causes a fatal crash during Voyager's first test with slipstream travel. Fifteen years in the future, survivors Chakotay, Kim and The Doctor attempt to send a message back in time to prevent the tragedy.
When Voyager is destroyed, Captain Braxton of the 29th Century Timeship Relativity contacts Seven of Nine to travel back in time and discover who planted the 'temporal disruptor.' However, she must do this without being discovered by the past Janeway.
Kes returns to Voyager older, angry, and more powerful than ever. Using her abilities in combination with Voyager's warp core, Kes travels back in time to Voyager's first year in the Delta Quadrant. Her agenda is to kidnap her younger self and return her to the Ocampa, even if it means turning her former friends over to the Vidiians. The only one to suspect anything is Tuvok, who is experiencing intermittent visions and memories of the future.
After an accident, Chakotay is able to pass through the distortions that are scattered about the ship after Voyager goes through a temporal rift. In various sections of the ship, its past and future exist side by side and Chakotay must convince its crew, past and present, to work together to save Voyager.
Ten years after Voyager's return from a 23 year journey across the galaxy, Admiral Janeway breaks all the temporal rules and journeys back in time to change a decision she made that prolonged their journey by 16 years. Bringing technology that will help fight the Borg, the Admiral wants her younger self to fight the Borg and use their transwarp hub to go home.
Star Trek: Enterprise
Enterprise has a group of aliens watching a stellar phenomenon on board. When a plasma storm hits Enterprise, the ship is miraculously saved from destruction by one of the aliens who disconnected a cable saving Enterprise. Later, the crewman Daniels tells Archer that he is a time traveler that has come from the future to chase the Sulliban soldier Silik, his opponent in a temporal cold war.
After an accident, the Enterprise's mission is ended and the crew are called back to Earth. When the ship has altered course, crewman Daniels, a time traveler, pays a visit to captain Archer. Daniels and Archer end up stranded in the 31st century, where they investigate the damage to the time line and try to find way a to get Archer back in his own century.
Enterprise discovers a strange pod. After towing it in, the doctor confirms the dead pilot is human. Captain Archer suspects this man may be Zefram Cochrane, who developed the warp drive on earth, and disappeared with an experimental ship. The pod discovered by Archer and Tucker shares a few similarities with a ship from another long running science-fiction franchise, namely 'Doctor Who'. The pod and the Doctor's TARDIS are both bigger on the inside than the outside, and able to travel across time.
Enterprise is hit with a rather intense anomaly. Refusing to leave an injured T'Pol behind, Archer is struck by the anomaly, leaving his brain infected with parasites, preventing him from making any new memories. It transpires that the parasites effecting Archer lives outside normal space-time and usual remedies don't work.
Archer and T'Pol travel back in time to Detroit in 2004 to stop three Xindi-Reptilians from constructing a bioweapon.
Archer decides he should pilot a kamikaze shuttle to destroy the Xindi weapon. Temporal agent Daniels urges him to reconsider.
Trying to pass through a subspace corridor, Enterprise is stopped by a version of itself from the future.
Archer takes Degra's ship to try to prevent Earth from being destroyed and gets some unexpected help. Enterprise tries to destroy Sphere 41, but the Sphere Builders know about the plan.
Following the destruction of the Xindi weapon, the Enterprise crew discovers that they have been sent back in time to 1944. However, history has been altered, leaving Nazi Germany in control of a large portion of the eastern United States. After Silik attacks Trip, Vosk wants to make a deal with Archer: supplies of the ship for the completion of his time machine in return for a trip to the 22nd Century.
Star Trek: Discovery
As the USS Discovery crew attempts to let loose at a party, an unwelcome visitor comes aboard bringing about a problematic and twisted sequence of events.
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