A timeline is a paradox filled science fiction plot device consisting of a series of chronological events, each a link from the past that leads up to the present. Timelines are sometimes portrayed as being vulnerable to alteration and are often threatened by the actions of time travelers.

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Star Trek Alternate Timeline-Who Knows About It?

With the new movie coming up I've been wondering: Just how many people know that Nero was from the future and created the alternate timeline they are all now living in? Starfleet Command knows, and ...
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Did Marty wipe his children from existence?

At the end of Back to the Future, Part III, Marty declines to enter the drag race that was shown in the previous film to have disastrous consequences for his musical career. The 2015 fax of ...
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Stargate: Continuum, time travel, people vanish from timeline at different moments

In the movie Stargate: Continuum, is there an in-universe explanation about why and when Ba'al's failsafe plan was triggered, and why there was a delayed timeline ripple as individuals disappeared at ...
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Did Marty-2 go to the Lone Pine Mall, or was is still Twin Pines Mall for him?

In Back to the Future when Marty first goes to the mall to meet up with Doc he walks past the mall sign which reads Twin Pines Mall. At the end of the movie when he returns to the mall to save Doc and ...
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Star Trek in-universe timeline versus external events: when did they separate?

It's clear from the 1992 start date of the Eugenics Wars that Star Trek's timeline has already diverged from ours. Are there any earlier points of divergence? In DS9's "Little Green Men" episode, ...
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Are there actually fixed points in time?

All across Doctor Who series, we are told about "fixed points in time". That seems to be fully admitted by whole Who community. I was watching Water of Mars, and something struck me: the Doctor said ...
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How could Janeway have used Holodecks as a child when they were new to Picard?

How could Janeway use Holodecks as a child when Picard and the rest of the Enterprise-D crew make it clear in TNG: Encounter at Farpoint that holo-technology is very new? For many of them it's the ...
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What are the known instances of the Doctor's *personal* history being rewritten?

The Doctor says he can't go back on his own timeline (for example, Smith and Jones, "except for cheap tricks"). It's implied it's a very bad thing to mess with his timeline. What are the instances of ...
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What happened to the other characters in the 1985 “Biff-timeline”?

In Back to the Future 2, Jennifer is left on a swing at her house and reality changes around her. But what happens to all the other main characters, especially the McFly family? I know Lorraine is in ...
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2answers
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How can The Flash still exist, given the events of the last episode of season 1?

Since there would be no So the time line will be altered drastically: remember Eobard said to Wells that he only built the particle accelerator in 2020. So how is it even possible for the Flash ...
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What is the latest date for the setting in a sci-fi text or movie?

I was thinking of the Mayans this morning, and the controversy about the Mayan calendar in 2012 (through a long and circuitous thought process). But it got me thinking: Someone back 5000 years ago ...
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How many dead Dougs are obscured in Deja Vu?

The plot of Deja Vu movie plays a lot with backward time travel theme. Backward time travel in science fiction can work in one of two ways: immutable timeline or mutable timeline. The first one ...
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Why did Kyle choose that time in Terminator Genisys

Kyle "convinces" Sarah to Why doesn't he instead I get that it sets up dramatic tension (countdowns!), but is there any coherent in-universe explanation for this?
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What is the point of sending anything back in time in the Terminator movies?

As explored in another SCF question, the only way to answer the bootstrap paradox is to say "every time someone is sent back in time, time branches into a separate line." But if that is the case, ...
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How did Walter send back the Machine in the Amber Timeline?

One of the main plot points in Season 3 of Fringe was the Machine. In the Original Timeline, i.e. the timeline shown in the first three seasons of the show, in 2011 Peter uses the Machine to destroy ...
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1answer
153 views

How is the timeline of Marvel established amid the multiverse, reboots, etc?

A bit of a vague question, I know. Stay with me. I like superheroes and comics, but I'm not a huge buff. One thing that I never seem to be able to figure out is how the timelines of comics (I'll ...
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4answers
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Do the time travel mechanics in Terminator Genisys make sense?

As far as I am aware, the Terminator franchise operates on the idea that time travel works by creating alternate timelines when something is sent back in time, allowing the future of the new timeline ...
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Seeking title of short story that ran in Playboy (or Maxim?) about New York City's future rise and fall over the next century

Need the title of a short story that ran in Playboy (or Maxim) about four years ago (late 2010-early 2011). The subject of the story concerned a single brownstone building that lays witness to the ...
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1answer
102 views

Is it possible to determine when the events of Archer take place?

Archer seems to take place in an invented timeline: the internet is commonly used by civilians (which actually began in the mid-90's), the I.R.A. is still active (in the real world, they ceased ...
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2answers
328 views

How did Voyager encounter the Krenim so soon when Kes hadn't ascended?

In Voyager's Before and After, Kes warns Captain Janeway (at the point in her timeline when she is eventually stabilized) about their impending encounter with the Krenim "in about six months", for ...
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3answers
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How long was Rick in the hospital?

I have always assumed that Rick was in the hospital for about 3 weeks. Several factors led me to this conclusion: The length of his beard; the fact that the IV bag was empty, but he didn't die of ...
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2answers
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What is the timeline for the Mad Max series?

Dates are probably of little importance to the people who exist in the post-apocalyptic world depicted in the Mad Max tetralogy, but of interest to the viewer: Is it stated in what year(s) the Mad ...
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Blake's Seven timeline

I cannot find a good resource for a timeline, -- with dates in an in-Universe dating system -- for the back-story and plot of Blake's 7. From what I can tell from tangential references, the B7 ...
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2answers
580 views

Why didn't the Doctor know he would regenerate again? [duplicate]

In The Day of the Doctor, all 13 Doctors turn up to help save Gallifrey, and it's assumed that Ten, Eleven, and War have summoned the rest. Given Twelve's presence - a form that Eleven hasn't yet seen ...
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1answer
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Seeking a story about a time-traveler living backwards in a capsule

I'm hunting for the title of a short story where a senile old man appears in a capsule in a laboratory. They eventually realize time is passing backwards for him. After years he helps them build the ...
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1answer
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Do Judy and Peter remember anything from the events in Jumanji?

According to this answer, the game Jumanji teaches its players important life lessons. Jumanji appears to be an artifact designed to teach the players important values, as games often do, but ...
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1answer
883 views

When was David Tennant's Doctor in “Day of The Doctor”?

After re-watching the 50th anniversary special of Doctor Who I was wondering at what point in time David Tennant's doctor was along his own timeline. He mentions to the rabbit that he is 904 and he ...
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896 views

Story About Time Travel Using a Gate on the Sun

When I was in high school (6 or 7 years ago), one of the short stories that we read out of the text book had to do with an alien civilization that had discovered time travel. They had managed to ...
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3k views

Is there a complete list of published dates for all the New 52 titles? [closed]

I didn't think I needed to ask this question, but DC forced me into this. I am not used to of DC's way of telling a story by putting it in several different comics and even in several different ...
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0answers
118 views

Name of alternate timeline short story

In the story the man helps with someone's estate and receives a custom clock. He discovers the clock maker lives in the woods outside town and visits him. After leaving the place at night he gets lost ...
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1answer
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How did Magneto get out of prison in the original timeline?

In X-Men: Days of Future past, the timelines between the war future and the end-of-the-movie future begin to diverge when Wolverine wakes up in the past and begins meddling with things, such as ...
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2answers
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When is Fahrenheit 451 set?

Is there an allocated time period in Ray Bradbury's novel? I'm not too sure if there is a timeline that led up to the events in the book, so the time in which it is set is unclear to me.
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How is Data alive in “All Good Things” when he died in Nemesis?

In the Star Trek TNG series finale, "All Good Things", Data is clearly alive and well while Picard is an old man. But Data is clearly destroyed in Star Trek: Nemesis, while Picard is still relatively ...
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Why did Daleks left Adelaide Brooke alive ( Fixed point in time issue )

In The Waters of Mars, it is shown that a Dalek left Adelaide Brooke unharmed when she was young during the events of The Stolen Earth, because she was a "fixed point in time" according to words of ...
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In Eureka Season 2, does Henry Deacon remember the circumstances of Kim Anderson's death?

In the Season 1 finale "One in a Lifetime" Jack Carter Upon resolving the timeline, Henry confronts Carter, knowing that he made the right decision but unable to accept it. They agree to erase ...
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What happens between the end of the last series and the 50th anniversary special? [duplicate]

Lots of spoilers, obviously. At the end of the last series, in The Name of the Doctor: Then in the 50th anniversary special The Day of the Doctor: How? What happened between these two episodes? ...
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In Primer, why aren’t there six Aarons?

At the end of Primer, we know that “Primer” gets locked in the attic, thus “Hooded” (and later “Earpiece”) wouldn’t be able to exist if — like in most on-screen time-travel — he needs to enter the ...
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Why aren't the Xindi referred to anywhere other than Enterprise?

The Xindi (multiple species in the sector) were shown only in Enterprise. What happens to them in the later timelines? Why isn't there any mention of these species in other Star Trek series, since ...
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What was the point in the Silence trying to kill the Doctor when Clara saves him anyway?

The Silence set out to kill the doctor to prevent him from ever answering his name on the Trenzalore, as something bad would obviously quite happen there, hence the phrase 'Silence will Fall'. ...
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When does the Doctor actually tell River his name? [duplicate]

In The Name of the Doctor, we are technically seeing a saved version of River Song from the Library, meaning she's definitely dead. If this is so, where in the timeline does the Doctor tell her his ...
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Was Kyle Reese always John Connor's father? [duplicate]

If Kyle Reese was always John Connor's father: Kyle pops out of nowhere, impregnates Sarah, dies, and then Kyle Reese is born, becomes a member of resistance and he is sent back in time. John Connor ...
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Why doesn't Cortexiphan kill William Bell in the Fringe Season four finale

In season 3 we learn that Cortexiphan is fatal for adults. Being as William had not had it as a kid, and the development of Cortexiphan was before the split in the timeline, how can William Bell take ...
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Annorax and the Krenim Weapon Ship

At the end of VOY:Year of Hell Part 2, you see Annorax with his wife and he is working on Temporal Incursion Calculations. Does this imply that a significant portion of the Delta Quadrant would be ...
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681 views

What year was the Time Lock established?

Is there any evidence to indicate when - what year by our Earthly reckoning - the Time Lock was put in place around the Time War between the Daleks and Time Lords?
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Is Star Trek set in our future, or is it an alternate universe? [closed]

If I recall correctly, the Eugenics Wars were supposed to have occurred in the 1990s and World War 3 is supposed to happen relatively early in the 21st century. Obviously, the Eugenics Wars did not ...
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1answer
335 views

Why can the wormhole aliens communicate with and learn from humans at all?

We know that the aliens living inside the wormhole adjacent to DS9 and Bajor (also known as "Prophets" by the Bajoran clergy) have no concept of linear time as we know it. That is, their conciousness ...
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Where does Artemis stand in the Star Trek timeline?

The multiplayer co-op game and Star Trek Bridge Simualator, Artemis, presents the players with the ability to roleplay their own scenarios with their own personal crew and ship. As such, the game ...
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Has Star Trek ever addressed why our timeline is different than theirs?

The Star Trek universe and ours are identical (as far as we know) until sometime between the 1960s and 1993. We know from Vic Fontaine and various references to Apollo that the 1960s happened very ...
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Was Harold Saxon the next Prime Minister after Harriet Jones?

So did the Doctor start the events leading to his capture by the Master, and the events of The Sound of Drums/Last of the Time Lords, when he caused Harriet Jones's resignation?
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How did time-travel work in The Philadelphia Experiment 2?

Time travel in The Philadelphia Experiment (1984) is kept simple, there is no "new" timeline created. Jim Parker goes forward and then back in time and David Herdeg is remembered by other crewmates as ...