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Alternate timeline episodes

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A list of episodes where we see an alternate timeline. For a list of episodes where we see 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 4 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

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

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