Back to the Future is the first film (1985) in a trilogy of time travel movies that branched out into an animated TV series, theme rides and video games. This tag can also be used to refer to the Back to the Future franchise as a whole.

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Why was Eric Stoltz substituted by Michael J Fox?

I read in many places that Eric Stoltz was substituted by Michael J Fox in the film Back to the future. And the main reason is that Eric wasn't bringing the screwball energy the film needed. Is this ...
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How did the Terrorists find out when and where Doc would be?

In an early scene of Back to the Future, Doc is It's feasible that the terrorists would be able to find out that Doc lived in Hill Valley. However, it seems mighty unlikely that they could figure ...
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Why did Doc Brown take so long to write to Marty?

At the end of Back to the Future II, Marty receives a letter from the Doc from September 1885, just a few days before his death. He explains in that letter that he had been living in 1885 for the past ...
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Did the Delorean have keys?

I don't remember seeing any. It might have saved some trouble with Biff stealing it in Back to the Future II if it had. But it's also possible they were just left in the ignition all the time.
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What kind of paradox is this? [duplicate]

I was wondering something regarding the Back To The Future movie: Marty McFly is on stage and he's playing Johnny B. Goode. Marvin Berry phones his cousin Chuck Berry (the person who wrote the song). ...
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1answer
136 views

What is Doc Brown's position on altering time throughout the Back to the Future Films?

Doc Brown seems pretty concerned about keeping things consistent at least when it comes knowing about his own future or making sure Marty's parents meet and marry. However, he never seems to either ...
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Why is Old Biff evil?

At the end of Back to the Future, we see But then in Back to the Future 2, old Biff is his evil old self. Shouldn't his status at the end of BttF1 have prevented that from happening? Why is old ...
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1answer
278 views

Why is the 2015 Earth's population so high in BttF 2?

According to the front page, 2015's USA Today has three billion daily readers. Given that most readers of USA Today would live in America, that implies that there are billions of people in the U.S. ...
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1answer
163 views

Do Marty's memories eventually get updated?

At the end of Back to the Future, Marty wakes up He of course, doesn't remember them or their history together, since it's a result of his time traveling. Earlier in the film we see that changes ...
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1answer
129 views

Why didn't Marty's erasure continue?

At the end of Back to the Future, Marty goes back to the future. He then finds This is almost completely different from the timeline he left. Earlier in the film, he's trying to get his parents ...
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1answer
178 views

Why were the makers of BTTF going to use a fridge as a time machine?

So, as every good Back to the Future fan knows, the DeLorean wasn't in the original plan for Back to the Future. The time machine was going to be a fridge (Great Scott - I'm glad they changed their ...
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0answers
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Why is DeLorean cold upon arrival to a destination time? [duplicate]

What makes the time machine drop its surface temperature once it arrives to a destination time? Why is it so cold? Shouldn't it be all hot instead due to a 1.21 gigawatt energy influx?
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Why does DeLorean leave burning trails in the time of departure?

The question is pretty straightforward. Is there any explanation to why DeLorean leaves burning trails in the time it travels from? Moreover, in the end of the first movie when Marty travels from 1955 ...
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1answer
114 views

What is Dr. Emmet Brown's speciality/education?

It's hard to believe that a genius like Doc has no formal education. Is there any info on what his alma-mater is and what his speciality is (like, quantum physics, or something)?
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2answers
240 views

How did Marty hit the wire in the first movie?

In the end of the first movie we see that Marty could not start the engine of the DeLorean when the alarm clock rang. Doc had calculated the time required by the car to reach the lightning wire ...
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2answers
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Does Gray's Sports Almanac 1950-2000 actually exist?

So, the main plot device in Back to the Future II (aside from the DeLorean) is Gray's Sports Almanac 1950-2000. As we're now in 2015, the statistics must be available, so my question is does the book ...
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2answers
247 views

Why did the Doc decide to use a train?

In Back to the Future III, Marty gets back to 1985 by putting the DeLorean in front of a train, then using special fuel to increase the speed of the train. If this failed, the DeLorean - with Marty ...
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2answers
2k views

What was the longest time jump in the Back to the Future canon?

The shortest time jump was, presumably, the first; Einstein's trip a single minute forward during the experiment in the Twin Pines Mall parking lot. What was the longest jump backwards or forwards ...
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1answer
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Why didn't the two Biffs go into shock?

So, in Back to the Future II, we see that when 1985 Jennifer sees 2015 Jennifer, they go into shock as predicted by Doc Brown. Yet, when old Biff sees young Biff, they don't go into shock. Why this ...
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2answers
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Who invented Darth Vader? George Lucas or George McFly?

In Back to the Future, Marty famously frightens his father into action in 1955 by pretending to be Darth Vader from the planet Vulcan: Presumably, Star Trek and Star ...
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4answers
9k views

What happens if you exceed 88 miles per hour?

So, we all know that the special speed at which the DeLorean will travel through time is 88 miles per hour (if you didn't already, now you do). Yet, you will only travel through time if the time ...
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1answer
335 views

How did the DeLorean travel to 1885? [duplicate]

At the end of Back to the Future II, a lightning bolt hits the DeLorean which sends it back to 1885. At the time though, the DeLorean wasn't moving; it was relatively stationary hovering in the ...
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1answer
172 views

Does Hill-Valley, CA exist?

Okay, I know the city itself is fictitious. However, related to the accepted answer to Where is Hill Valley?, does this map, used in BTTF3, correspond to a real location? Note that the linked ...
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3answers
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Where is Hill Valley?

Many BTTF fans know that Marty, Doc and Jennifer arrive in Hill Valley on October 21st 2015, and were eagerly awaiting that date. As outlined in this question, they arrive at 4:29PM. However, the ...
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2answers
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DeLorean has recycle fuel and it's flying at 1985 and Doc is went to 1885 but why DeLorean hasn't recycle fuel and didn't fly at 1885? [closed]

DeLorean has recycle fuel and it's flying at 1985 and Doc is went to 1885 but why DeLorean hasn't recycle fuel and didn't fly at 1885?
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1answer
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Why does Doc ask Marty “Never?” when Marty tells him George had never stood up to Biff?

In the first movie of the Back to the Future trilogy, when Marty comes back from the "Enchantment under the Sea" to get sent back to the future by Doc, he tells Doc that his father stood up for ...
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2answers
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In the Back to the Future trilogy, does Doc ever piece together the letter about the terrorists?

In the Back to the Future trilogy, Marty writes a letter to Doc to warn him about his impending demise. We learn at the end of the first film that: Nevertheless, at the end of the second film and ...
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1answer
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When does Marty Travel to in the future?

I have seen all sorts of posts on the Internet about when he travels to, but most of them are doctored to make people repost them. I originally saw one picture that showed the deLorean dash showing a ...
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1answer
387 views

What is the Doc's middle name?

As you can see in the image of the time train below, there are three letters: "ELB". Now, it stands to reason that these are probably Doc Brown's initials i.e. Emmett Brown. This indicates, though, ...
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Why did Doc build the Time Train?

A thought just struck me that from Back to the Future II onwards, Doc was quite adamant of the need to destroy the DeLorean, not because it was a bad car or anything, but because the risk of time ...
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2answers
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Why did Dave's head get erased before his body?

We all remember the scene where Marty is playing the guitar and then starts to have difficulty as his hand fades. That got me to thinking: the photograph of the three kids showed that certain parts ...
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1answer
164 views

What happens when you don't enter a time in the time circuits?

The time circuits in the DeLorean have the capacity to enter times and dates. My question is then: if you were to enter a date and not a time, what time would you arrive at on the specified date?
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Why was Clayton Ravine renamed Eastwood Ravine?

This is something that has bothered me for a long time, and this question question reminded of it and motivated me to ask it here. At the end of Back to the Future III, we see that the ravine ...
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3answers
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Is there any discussion of a Back to the Future sequel or remake?

I ask this because it was The highest grossing film of 1985, Back to the Future launched one of the most successful franchises in Universal's history, including two theatrical sequels, an animated ...
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3answers
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How could the level crossing at the end of Back to the Future 3 know that the locomotive would arrive?

In the end of Back to the Future 3, Marty and Jennifer check the wreckage site of the DeLorean when the railroad level crossing suddenly activates and lowers its barriers without any trains nearby. ...
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2answers
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Do we know if any other foods can be hydrated?

In Back to the Future II, we see Grandma Lorraine rehydrate a pizza - very well too I might add. The tool used for this is a hydrator. Looking at the linked article for a hydrator on Futurepedia, ...
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4answers
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Which 2015 technologies were correctly predicted by Back to the Future II?

This year is not only the 30th anniversary of the Back to the Future  franchise as a whole, but is also the year in which Back to the Future II  is set. Which technologies that exist in ...
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1answer
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What was George McFly's and Biff's jobs in the original timeline?

At the beginning of Back to the Future we see a scene, which we later see a parallel of in 1955) where Biff asks George whether he has completed his work yet so he can get it typed up. I'm just ...
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1answer
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Does the BttF time travel require fuel/power?

After seeing this question about the time-travelling range of the DeLorean, the consensus was that it was merely restricted by the controls (a 4 digit number, giving it a range of 0-9999). However, ...
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1answer
273 views

Is there anyone Strickland doesn't think is a slacker?

Throughout the Back to the Future series, we see that Strickland, sorry, Mr Strickland calls Marty a 'slacker' and George a slacker, even the guys shooting at his house are slackers. Do we know of ...
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Does the DeLorean have any restrictions regarding time travel range?

I'm just wondering whether the DeLorean time machine has any restrictions on how far into the future or how far into the past it can travel. Inspired when I was considering an earlier question of ...
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1answer
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Do any other dates in Back to the Future have any significance out of universe other than November 5?

In this related question we see that there could be an out of universe significance to the date November 5. But what about the other dates? I've listed them below. Is there any evidence indicating ...
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Why did the time circuits default to 1885?

In Back to the Future II, on November 12 1955 the DeLorean with Doc in it gets struck by a bolt of lightning, sending him back to 12 AM 1 January 1885. The potential for this is alluded to previously ...
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1answer
189 views

Why was there smoke/opaque gas in Doc's Van?

This question is inspired from this question earlier today. In Back to the Future, we see the DeLorean famously exiting the van (see below), but there's a lot of smoke, or at least a whitish gas of ...
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2answers
934 views

How did Doc get into the DeLorean?

(First of all - kudos to WadCheber for inspiring this question) When the DeLorean is first revealed, we see it exiting from Doc's Truck: In the image I've given ...
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2answers
431 views

Was George peeping on Loraine?

I've included the video for the respective (well, it's not very respectful :P) scene below: We see George is a peeping tom as Marty so astutely points out, but my ...
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Where did Marty hit his head?

I watched Back to the Future last night, for the first time in years, and I noticed something that I had never taken note of before. The nature of Marty's injury from being hit by a car is ...
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438 views

Was Doc Brown about to break his own rules?

Richard's comment on this question made me realize that Doc Brown seems to be a bit hypocritical. Allow me to explain. The whole reason Marty ends up in 1955 (as opposed to any other point in ...
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1answer
434 views

Why did the Doc refuse to let Marty tell him about the night Marty went back to 1955?

On more than one occasion in Back to the Future, Marty tries to warn 1955-Doc that he will be shot on the night he tests the DeLorean. The first time, he tells Marty to shut up and says something ...
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1answer
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Why does Doc Brown have an enormous amplifier in his house?

Back to the Future begins with Marty going to Doc Brown's house, turning on an absurdly large amplifier, turning it up (to eleven?) plugging in his guitar, playing a single chord, and blowing himself ...