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74 votes

Does Doc Brown sabotage himself in Back to the Future 2?

Maybe I am missing a point to your question, but the wrench is a wrench, it either is good for the nut/bolt you use, or it is not. Ie. if the future Doc gave the past Doc the five-eighths wrench the ...
Dvorkam's user avatar
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29 votes
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Wouldn't the paradox machine be useful for the Doctor?

There are several reasons The Doctor would decide against building a Paradox Machine: He doesn't know how The original Paradox Machine was created by The Master. There's no reason to suspect The ...
DisturbedNeo's user avatar
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29 votes

Does Doc Brown sabotage himself in Back to the Future 2?

Of the options you presented, I'd go with... A) The whole interaction is indeed harmless and will have no effect. In regard to your second option... B) He gave himself the right wrench, but that was ...
LogicDictates's user avatar
28 votes
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Earliest instance of the grandfather paradox

1929: "Paradox", a novelette by Charles Cloukey, mentioned on p. 286 of Paul J. Nahin's book Time Machines: Time Travel in Physics, Metaphysics, and Science Fiction, Second Edition; ...
user14111's user avatar
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22 votes

If Marty had faded out, would that have destroyed the universe?

I think the case of Old Biff applies here. In BttF Part II Biff from 2015 goes back to 1955 and changes the timeline. He then goes back to the future (roll credits), where he walks off. Offscreen, ...
DaaaahWhoosh's user avatar
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15 votes

If Marty had faded out, would that have destroyed the universe?

It is impossible to give an in-universe answer All talks of time paradoxes are Doc's scientific speculations, which may or may not be true. Nobody had such experiences before, and time travel theory ...
TimSparrow's user avatar
13 votes

Why was Marty present in his jump to 2015 in Back to the Future 2?

This was answered in the official BTTF FAQ which was done by the script writers, Bob Gale and Robert Zemeckis: 1.13: When Doc takes Marty and Jennifer out of 1985 and brings them to the future, how ...
Hypnosifl's user avatar
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13 votes

At the end of the first Back to the Future movie, how come Marty can witness the original events happening then wake up to visit an alternate family?

From what we see of Marty's post-timeline change family (the one that exists because of Timeline 1's Marty changing how his parents meet), it looks none of the changes prevented Marty and Doc Brown ...
AncientSwordRage's user avatar
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11 votes

Did Edith Keeler really have to die?

SPOCK: I was recording images at the time McCoy left. A rather barbaric period in your American history. I believe I can approximate just when to jump. Perhaps within a month of the correct time. A ...
Wilbur's user avatar
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10 votes

Jennifer from BTTF left behind

There is a single changing timeline I tried to illustrate why I think there must be a single changing timeline. To sum it up, if alternate timelines persist in the BTTF universe, I can't think of ...
Ben Osborne's user avatar
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10 votes
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Jennifer from BTTF left behind

The single changing timeline seems to be the one the writers imagined, and they also imagined that when time traveler A is in one era and time traveler B in earlier era changes history, the world will ...
Hypnosifl's user avatar
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10 votes

At the end of the first Back to the Future movie, how come Marty can witness the original events happening then wake up to visit an alternate family?

AncientSwordRage gave a great out-of-universe answer. Here is an in-universe one. Because Marty had already told him the flux capacitor worked, and left a note telling him what to do (in a round-...
sevensevens's user avatar
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10 votes

Does Doc Brown sabotage himself in Back to the Future 2?

There was no "snap" If you rewatch the original movie, you'll see that in both cases (up on the clock tower and down at the street post) the cable uplugged. Nothing was broken, it just came ...
MivaScott's user avatar
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9 votes

SF short story about equation that can answer any question and agents sent back in time to destroy it

This is "Things Undone" by John Barnes. It can be read online here. equation (or series of questions? something like that) written in the 1700s or 1800s Six hundred years ago, in the One ...
Ayshe's user avatar
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9 votes

Wouldn't the paradox machine be useful for the Doctor?

he could save anyone and do anything he wanted to do The Doctor himself has had this exact thought once before: during the Tenth Doctor episode "The Waters of Mars". The deaths of the Bowie Base One ...
F1Krazy's user avatar
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8 votes

Earliest instance of the grandfather paradox

René Barjavel novel Le Voyageur imprudent (Future Times Three) written in 1944. Is not as old as beichst example but I think it captures the spirit of Granfather Paradox better. Pierre Saint-Menoux, ...
Ram's user avatar
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8 votes
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What type of paradox kills Weeping Angels?

Angels can also be starved to death - they literally waste away, their forms decaying, looking like erosion. The time frame needed to do so in unknown. The way they feed is somewhat unclear - in ...
VBartilucci's user avatar
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8 votes

Trying to find a time travel short story

Sounds like "The Chronology Protection Case" by Paul Levinson. Summary from Amazon: When NYPD forensic detective Phil D'Amato takes a call from a lady physicist about her missing husband, ...
Emsley Wyatt's user avatar
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6 votes

Why couldn't the Doctor save Adric?

He tried, but the TARDIS was damaged From a plot summary: The Doctor tries to pilot the TARDIS back to the bridge to rescue Adric, but the controls have been damaged during the fight. Adric ...
DisturbedNeo's user avatar
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6 votes
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Earliest example of an AI being defeated by a paradox

I believe the earliest such story was "Liar!" by Isaac Asimov, circa 1941. In the story a mind-reading robot had been created and its unique ability produced unforeseen and unfortunate ...
Kyle Jones's user avatar
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5 votes

Looking for a short story about time travel; characters attempting to fix a boat

In the absence of other answers, I think your story, as described, has two features suggestive (albeit only approximately) of Frederik Pohl's "The Tunnel under the World" (copyright 1954, published in ...
old_buck_with_no_dough's user avatar
5 votes
Accepted

Story with the continuum hypothesis at the end

"Diabologic" by Eric Frank Russell. Previously identified as the answer to Funny short story on man and insect that land on new planet and irritate war-loving inhabitants The ending you are ...
John Rennie's user avatar
5 votes
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If Marty had faded out, would that have destroyed the universe?

I think it's important to note that having young Jennifer meet her older self isn't said to definitely create a universe ending paradox, but that it could create a universe ending paradox. As ...
Jason's user avatar
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5 votes

Isn't ending of Terminator 2:Judgement day a time paradox?

Time travel isn't real. The writers can make up whatever rules they want regarding it. If they don't want a paradox to be an issue, it won't be. It doesn't help that the franchise has had different ...
suchiuomizu's user avatar
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5 votes

Isn't ending of Terminator 2:Judgement day a time paradox?

In the Terminator franchise, creating a paradox isn't a problem; you have simply changed history, and the future you remember won't happen. The movies don't all take place in the same history. The ...
Robyn's user avatar
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5 votes

What 90's made-for-tv movie featured a time-traveling policeman who left his wife a note from the past?

Out of Time maybe. It was an NBC failed pilot. Bruce Abbott plays the time traveler, chasing Adam Ant (!) back to 1988 and teaming up with his grandfather or maybe great grandfather, played by Bill ...
cycad's user avatar
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5 votes

At the end of the first Back to the Future movie, how come Marty can witness the original events happening then wake up to visit an alternate family?

The events at the beginning of the film took place at Twin Pines mall. The end took place at Lone Pine mall. (Note: the DeLorean killed a pine tree at the 1955 farm) Now this is purely personal but ...
lucasbachmann's user avatar
4 votes

Earliest instance of the grandfather paradox

I don't know if this would match what you are seeking. But in Wikipedia under the section for backward time travel there is the following description which seems like it might. Namely that by ...
beichst's user avatar
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4 votes

Does Terminator 3 undermine the 'No Fate' concept?

I agree from a story-telling point of view, the struggle and lessons learned from T2 are ignored in T3. But from an in-universe point of view, why shouldn't they be? Humankind never got to hear of ...
komodosp's user avatar
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4 votes

Identifying a short story about time travel and paradoxes

David Gerrold's 'The Man Who Folded Himself' also has this occur, allowing some to call it 'The Man Who F***** Himself'.
Jayessell's user avatar
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