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A list of episodes involving an alternate timeline. For a list of episodes involving a parallel universe, see parallel universe episodes. For a list of episodes that feature actual travel through time, see time travel episodes.

Star Trek: The Original Series Edit

Episode Time Periods Cause Effects
"The City on the Edge of Forever" 1930-2267 Edith Keeler's death averted by McCoy Nazi Germany lasts beyond 1945, United Federation of Planets does not exist

Star Trek: The Animated Series Edit

Episode Time Periods Cause Effects
"Yesteryear" 2269, 2237 Death of Spock as a child Amanda Grayson has died, Thelin became USS Enterprise's first officer

Star Trek: The Next Generation Edit

Episode Time Periods Cause Effects
"Yesterday's Enterprise" 2366 USS Enterprise-C went through a temporal rift in 2344 Federation embroiled in long war with Klingons

"Yesterday's Enterprise"'s changes in detail:

  • By 2366, 22 years of war have raged between Klingons and the Federation, with the death toll in the billions. At that point, the war was going badly for the Federation, and a surrender seemed 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.
  • The Enterprise had no children on board as a result of the war.
  • Wesley Crusher was 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.

Star Trek: Deep Space Nine Edit

Episode Time Periods Cause Effects
"Past Tense, Part I" 2024, 2048, 2371 Gabriel Bell dies Federation does not exist, Romulans encroach on Alpha Centauri
"Past Tense, Part II" 2024, 2048, 2371 Gabriel Bell dies Federation does not exist, Romulans encroach on Alpha Centauri
"Accession" 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

Star Trek: Voyager Edit

Episode Time Periods Cause Effects
"Non Sequitur" 2372 Timestream Harry Kim did not join USS Voyager, Daniel Byrd joined instead
"Year of Hell" 2374 Krenim weapon ship Numerous incursions
"Year of Hell, Part II" 2374 Krenim weapon ship Numerous incursions

Star Trek: Enterprise Edit

Episode Time Periods Cause Effects
"Twilight" 2153-2165 Interspatial parasites Archer removed as captain of Enterprise NX-01, Xindi destruction of Earth and Human colonies
"Storm Front" 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 World War II where, with the help of the Na'kuhl, Germany successfully invades the United States of America
"Storm Front, Part II" 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 World War II where, with the help of the Na'kuhl, Germany successfully invades the United States of America

Films Edit

Film Time Periods Cause Effects
Star Trek Generations 2371 Tolian Soran destroys the Veridian system Civilization on Veridian IV wiped out; USS Enterprise crew killed; Soran enters the Nexus
Star Trek: First Contact 2063 Borg assimilate Earth Humans never achieve warp drive; Federation never founded; Borg space in the Alpha Quadrant
Star Trek 2233 onwards Accidental temporal incursion by the Narada, whose captain proceeds to enact a revenge plot that irrevocably changes the timeline Among other changes:
USS Kelvin destroyed, causing James T. Kirk to be born early and left without a father; Kirk joins Starfleet at a later date; Vulcan destroyed in 2258, leaving the Vulcans critically endangered; Earth nearly destroyed; Kirk given command of the USS Enterprise several years early; Christopher Pike promoted to admiral
Star Trek Into Darkness 2233 onwards Accidental temporal incursion by the Narada, whose captain proceeds to enact a revenge plot that irrevocably changes the timeline In addition to the above:
Militarization conspiracy; Khan Noonien Singh and his followers awakened early; Christopher Pike killed in 2259; Enterprise embarks on her five-year mission several years early
Star Trek Beyond 2233 onwards Accidental temporal incursion by the Narada, whose captain proceeds to enact a revenge plot that irrevocably changes the timeline In addition to the above:
Enterprise destroyed in 2263 rather than 2285; USS Franklin mystery solved; Enterprise-A launched in 2263 rather than 2286