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- Neil Gaiman's Marvel 1602 is set in a timeline in which the heroes and villains of the Marvel Comics Universe begin to appear 400 years early. In the end, the disrupting factor is identified and dealt with, and the history of the Marvel Universe is restored to normal (although the 1602 timeline survives in a pocket universe).
- K.A. Applegate's Animorphs did this a couple times. In Elfangor's Secret, a rogue Yeerk discovers a way of changing history, and sets about undermining Earth's past to make it easier to conquer. The book opens in the timeline created by his interference, with the protagonists unaware that this is not how history has always been until a Sufficiently Advanced Alien steps in and grants them Ripple Effect-Proof Memory, after which they pursue the Yeerk to restore history to normal.
- Isaac Asimov's The End of Eternity is set in the future, but it gradually becomes apparent that it's the future of a different past than our own. It ends with our history being created by a change in the past, when the time-traveling protagonists derail the sequence of events that would have led to the founding of Eternity.
- In Dirk Gently's Holistic Detective Agency by Douglas Adams, the time travel shenanigans result in several changes to history which result in the timeline we're familiar with, where the coelacanth survived to the 20th century, Samuel Taylor Coleridge never finished writing down "Kubla Khan", and Johann Sebastian Bach is the world's most famous and prolific Baroque composer.
- The Thursday Next books are set in an alternate history which gradually becomes more like our own over the course of the series, through two main mechanisms:
- A technology exists by which people can enter the world of a work of fiction and, potentially, affect the course of the story. In The Eyre Affair, the novel Jane Eyre initially has a different ending from the one in 'our' world. However, due to the exploits of the heroine and the events of the final climax taking place within the novel's original manuscript, the ending gets changed to the ending it does have in our world - something which everyone greatly approves of, since in that history the novel's 'original' ending was widely accepted to be depressing and dramatically unsatisfying. For added Mind Screw, the fifth book, First Amongst Sequels, does the same thing with the Thursday Next books themselves.
- Thursday's father, a rogue Time Police officer, spends much of the first four books bouncing around history and setting events right, and events after his intervention more closely resemble Real Life history. However, eventually time travel itself is retroactively never invented, and that still leaves the Thursday Next world with a past, present, and future wildly different from our own.
- In James P. Hogan's The Proteus Operation, the original timeline is one in which World War II never happened and the Nazis faded to obscurity after the Beer Hall Putsch. Some 21st century aristocrats go back to the 1920s and give Hitler funding and technology with the intent of moving in and taking over after he conquers the world for them. He takes what they offer, gives them the finger, and proceeds to take over just about the entire planet. An American team from that world's 1970s are able to go back to 1939 and sabotage the Nazis' time gate, and the uptime information they bring back is used by the Allied leaders to launch Operation Overlord and create our timeline.
- Ward Moore's novel Bring the Jubilee begins in a timeline where the Confederacy won the American Civil War; the main character goes back in time to observe Gettysburg and accidentally changes history to our version.
- Lawrence Watt-Evans' short story "One-Shot" has a guy go back in time to save Kennedy from being killed by a love-sick Marilyn Monroe. He drugs her and makes it look like a suicide. The Secret Service agent he confesses and proves his story to says he'll tell JFK about it after he gets back from Dallas.
- Times Without Number by John Brunner is a collection of short stories set in an alternate history where the Spanish Armada conquered England and the resultant European superpower went on to invent time travel. In the final story, an extremist travels back in time to sabotage the Armada; despite the hero's efforts, he succeeds, creating the history we're familiar with.
Live Action TV
- Andromeda: "The Unconquerable Man" depicts an alternative timeline in which Dylan Hunt is killed during the events of the first episode, and Gaheris Rhade survives. At the end of the episode, faced with disaster, Rhade travels back in time and sacrifices himself to secure Hunt's survival, creating the main timeline of the series. Unlike most versions of this trope, the episode doesn't begin in the alternate timeline, but instead with a scene of main-timeline-Hunt discovering a surviving trace of the old timeline, before going into a whole episode flashback.
- Quantum Leap:
- In the episode "Lee Harvey Oswald", Sam leaps into the title character, and Sam and Al have to decide whether the purpose of the leap is to shoot Kennedy, not shoot Kennedy, or something else entirely, since Oswald might not have been the assassin at all. It turns out that Oswald was the only shooter, no grassy knoll; the mission is to save Kennedy. Jackie Kennedy, who "originally" died in the shooting.
- In the episode "Goodbye, Norma Jean", Sam leaps into Marilyn Monroe's chauffeur. The episode ends with Sam preventing her death from a drug overdose, keeping her alive long enough to make The Misfits.
- Oddball variation: In Irregular Webcomic!, the Indiana Jones parody strips feature Hitler as a Brain in a Jar - to circumvent the fact that the LEGO Group doesn't produce Hitler figures. This is later explained as the result of a change from yet another alternate history where Hitler died in the Reichstag fire. He was brought back in the jar by Adam Savage of the MythBusters as part of Chess with Death (specifically, a bet that Adam couldn't confirm the myth that Hitler's brain was saved in a jar... hey.)