Regarding travel forwards or backwards in time, outside of normal temporal constraints, and the implications and repercussions thereof.

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Dr Who Blinovitch limitation effect [on hold]

The Blinovitch Limitation Effect (BLT) was introduced in "Day of the Daleks" as explaining that a time traveller cannot "redo" an act that he has previously committed. This left the impression that ...
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77 views

Daleks' time travel [on hold]

It is well known that the Daleks had perfected time travel (from rudimentary means of time corridors through to a TARDIS). Wouldn't the most obvious thing to do be to travel into their future and ...
18
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2answers
3k views

Are there non-legal consequences for wizards that meddle with time?

I'm not sure how much documentation there is on time in the HP universe, but time would obviously be an incredibly strong weapon to Voldemort, so I'm wondering why he didn't just rewind time and fix ...
9
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1answer
82 views

Time travel for literary research from Analog c. 1990s

This is a story from Analog Magazine about the 1990s. An English professor made his reputation critiquing the stories of a dead writer, especially one particular one. The story opened in class when ...
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1answer
102 views

Looking for a book i read a few years ago

This book was about two girls who are taken to the future because the future's iq population is dropping. An organisation takes smart people from the past to the future to boost the iq's. However, ...
38
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2answers
3k views

Need help to find a sci-fi collection I read at school (mid 80s)

I am now 46 and so it's been bugging me for over 30 years - time to try and do something about it. The collection was in my lower school library (UK). It was a thick black hardback book and I believe ...
5
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1answer
161 views

Short story - Man and beautiful girl are space tourists who visit disasters in galaxies

Read this in early 1980s - man meets up with a beautiful girl with equally beautiful friends. They are space tourists who visit disasters across galaxies and who are in town (San Francisco?) to await ...
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1answer
95 views

Story ID: Ex tries to prevent marriage via time travel

In the mid 80s I read an intriguing time travel story, collected in an anthology from the previous 10 years or so. It concerns a couple who realize that their history is being manipulated by the ...
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77 views

Animated film where protagonists travel to the future and save a robot-enslaved humanity

I watched many years ago when I was a kid this animated film, and I just can't find it. It may be an episode from an anime, but I don't think so, as I remember it being longer than that... Here is ...
4
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1answer
58 views

Where's the time travel in Mannequin 2: On the Move?

I've just watched an episode of American Dad and Stan was saying he hates all movies with a time travelling premise except for Mannequin 2. I couldn't see any time travel in the synopsis. Is there ...
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4answers
378 views

How do the crew determine the time after time-traveling?

When time traveling in Star Trek, the ship's clock always seems to show the correct time that they have traveled to. How do ship & crew determine what the exact date is, prior to the invention of ...
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1answer
88 views

In the movie Twelve Monkeys (1995), why couldn't James Cole change the past and still be the one who “gave the idea” of the disease to the antagonist?

While I was watching, the James Cole repeatedly says that he couldn't change the past "because he didn't" (so because it was determined or something like that). And yet, when he is in the past, he ...
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1answer
100 views

Which character has traveled in time the most on-screen?

The title says it all: Which main Star Trek character has traveled through time the most number of times on-screen? I'm referring to characters from the 22nd century to the 24th century - no ...
6
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1answer
159 views

Short story involving time travel through a train station

I cannot remember the story exactly, but I guess it goes like this - Protagonist was travelling somewhere. So he goes to a train station. But the ticket counter he went to appeared old fashioned ...
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2answers
122 views

Which starship has been sent back in time the most number of times?

The title says it all: Which starship has travelled back in time the most number of times? The only restriction is it must be from canon. It can be from any society, any time period.
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1answer
100 views

What Star Trek episodes are set in the 20th century?

Star Trek has a lot of time travel in it and, more often than not, it seems that when they travel back in time, they go to the 20th century. Which Trek episodes are set in 20th Earth century? I'll ...
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2answers
740 views

Superman/Flash Time Travel

Just finished Season 1 of The Flash. Loved it!!! The Flash time-travelled twice, once by himself and using the particle accelerator. Can Superman reach the same velocity to do the same? Is there ...
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0answers
75 views

Soldier from the near future in a war with Arab fighters, time travels to the past

I read a paperback novel at a library about 10 - 15 years ago and want to find it again. However, I can not remember the name or author of the novel, and can not find it in the library. It was ...
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1answer
87 views

Did any universe address the problem of double DNA [closed]

When you mess up time travelling and become your own ancestor, there is a big problem: At some point in time, a child will be born with exactly the same DNA as you. Did any franchise address ...
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1answer
157 views

Why did Harry and Hermione arrive in the Entrance hall after having used the Time-Turner in the hospital wing?

In the prisoner of Azkaban, after the events in the Shrieking Shak, Harry, Ron and Hermione are in the hospital wing. Dumbledore suggests they (Hermione & Harry) use the Time Turner to save more ...
3
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1answer
69 views

What will happen when David-A returns after 8 years?

At the end of Flight of the Navigator, David time travels, creating an alternate timeline where he didn't go to Phalon{sic} for 8 years. Lets call the David who disappeared for 8 years, David-A, and ...
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1answer
92 views

Building minutes [duplicate]

Does anyone know a SF TV short story in which there were blue men who helped "stage" our world- at least the parts we saw, on a minute by minute basis. So, at each minute, everyone would be in the ...
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1answer
107 views

Trying To Remember Time Travel Story

Back in elementary school (1994-1995) we had books called "readers" that contained short stories or excerpts from novels. One story was about a guy who had a time-travel device that was the size of an ...
7
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1answer
177 views

Time travel to the Middle Ages using math formulas; defeats knights with modern fencing skills

I am looking for a book I read (I think late 70's early 80's). It's about a young math wiz who travels back in time to the Middle Ages using math formulas. He is talented at fencing and uses his ...
3
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1answer
239 views

Time Traveler steps on a worm, changes everything

I heard of this in high school, but never learned its title or author- supposedly the aforementioned worm would have played a part in evolution that caused the extinction of the dinosaurs (instead of ...
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2answers
472 views

Is the Doctor's tomb in 'The Name of the Doctor' still yet to happen?

I mean will we see the Doctor fill that tomb someday or has it already happened and time has been rewritten from some time?
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2answers
129 views

In the third Harry Potter movie, why did they save Buckbeak if he is already alive?

Why did they go back in time to save Buckbeak if their future selves already saved Buckbeak?
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1answer
92 views

Did other writers adopt Asimov's concepts and terminology for changing time?

Summary: Did Asimov's time travel novel The End of Eternity influence other writers? In 1954, Isaac Asimov took a rejected short story and turned it into the clever time travel novel The End of ...
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80 views

Story - Roman Legionnaires travel through time and start our history

I originally read this story in German, but I'm pretty sure it is a translation from English. I have read it at around 2010, but the story was in a book already being older. I got it from a sale at a ...
5
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1answer
94 views

Why didn't Doc prevent Marty's accident in 1985

In the begining of Back to the Future Part II, when Doc arrives in 1985 to get Marty and Jennifer back to 2015, he apparently knows about the car accident that ruined Marty's life in the future. This ...
5
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0answers
108 views

What's this horror novel: Witchcraft, time warp, sex with the devil

At first this was structured a bit like a romance novel. (All character names are speculative at best, probably wrong.) Our heroine, Kate (maybe a redhead), has just met and married a rich young man ...
5
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0answers
71 views

Book in 90s/early 00s with time travel/world shifting with two tier society

I'm trying to remember a name of a book or the author that I read in the late 90s/early 00s. I read a lot by the same author, and she seemed to specialise in teen scifi/fantasy with romance. A lot of ...
4
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1answer
109 views

Novel with reincarnation. In the distant future a time-traveler becomes a wedding gift

I read this quite a while ago and the book was old even when I first encountered it. I probably read it in the 1970s, and it likely dated from the late 1930s, the 1940s, or perhaps the early 1950s. ...
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2answers
5k views

Can Marty McFly ever truly return home?

In the Back to the Future trilogy, the character Marty McFly travels back in time, and meets his own parents. In doing this, he directly changes the outcome of many things including the relationship ...
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2answers
209 views

Which X-Men timeline does Deadpool belong to (post X-Men movies)

This is my first post, so I'm not sure if this is a repeat question or not. I appreciate any answers you guys can give me. Given that X-Men: Days of Future Past retconned the entire X-Men series, ...
4
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1answer
120 views

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 ...
6
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3answers
239 views

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 ...
11
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1answer
2k views

Western film with a train crash which triggered time travel

I saw some of this film several years ago (2007?). It was being shown on a TV screen behind the counter in a shop, so I heard absolutely no audio and have no idea of e.g. any of the characters' names. ...
10
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2answers
266 views

Were the events of the Star Trek movie First Contact always a part of history?

In the movie Star Trek: First Contact, the crew of the Enterprise travel back in time and witness the Borg working to prevent Zefram Cochrane's first warp flight. They then decide to directly ...
5
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1answer
231 views

How did Admiral Janeway actually travel back in time?

How did she actually manage to travel back in time and actually end up in the delta quadrant from the alpha quadrant instantly using the chrono deflector?
3
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1answer
104 views

A book where a teen places a clock in a 'time portal' in his relatives' shed.

Many years ago as a teen I read a book that I've been thinking a lot about recently. It was a sci fi book about a teenage boy visiting relatives (uncle or grandparents maybe). In the shed he found ...
9
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2answers
198 views

Do time turners require magical ability?

As I said in this question, time turners are very simple: just turn the hourglass, and poof! You're back in time. But does it require magic? Could a Muggle do this?
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1answer
139 views

What if I wanted to travel back less than an hour?

Time turners are a very simple form of time travel. All you need to do is turn the turner some number of turns, which corresponds to the number of hours back you want to go. For example, Hermione ...
3
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1answer
140 views

Odd telescope allows sending messages into the past

I read this story fairly recently, but I read a lot of time travel SF last year so it may be an older story. (I've searched my ebooks and can't find it.) An odd telescope, or perhaps a normal ...
7
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1answer
212 views

Everyone of a certain age gets to send ONE message to younger self; some kids don't get messages

I read this fairly recently, in the last 5 years. A means of sending messages into the past was discovered, and the government decided it should be available to everyone in limited form. The societal ...
13
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1answer
200 views

Story about a temporal research station, lots of time travel

A few years back, I've read a very nice story about time travellers. I've been reading it online - no idea if it was ever published properly, or just an online-only piece - and was too busy that day ...
4
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1answer
130 views

How much could the Fifth Doctor remember from Time Crash?

In the Doctor Who Children in Need minisode Time Crash, the Fifth and Tenth Doctors briefly meet, and the Tenth saves them from a destructive paradox by cancelling out a supernova with a black hole. ...
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1answer
267 views

HP fanfic about two girls who went back in time

I'm trying to find a Harry Potter fanfic where two girls (I think one was Hermione, the other might have been Ginny or Luna, not sure) went back in time from sometime during Hogwarts to their younger ...
11
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1answer
892 views

What is Linda McFly eating for breakfast at the end of Back to the Future?

In the scene at the end of Back to the Future, Marty's siblings are eating breakfast together in the timeline where his family is rich and successful. What is his sister eating for breakfast? It looks ...
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1answer
94 views

Why don't they jump forward in time to find this character

In DC's "Legends of Tomorrow", we know that However, since Why doesn't the team just jump forward in time to