Note: This essay was
written for the Facebook page of Another Kind of Distance, my
time travel podcast with David Fiore. If you want to quibble with our
theories or interpretations or offer completely different ones of
your own, please comment there or contact us at
anotherkindofdistance@gmail.com. Our Back to the Future series
episode isn't up yet, but this essay may help
you get your bearings in our Timecrimes/Primer episode.
EDIT: the epic 3-hour podcast stroll through the BTTF trilogy is now available
EDIT: the epic 3-hour podcast stroll through the BTTF trilogy is now available
I bet when you were ten
or eleven or in your early teens, or however old you were when you
first saw the Back to the Future series, you followed the
movies without any problem and didn't find anything confusing or
problematic about the way they handled time travel. That's in stark
contrast to Primer,
where the time travel is probably internally consistent but the
narrative is hellishly confusing. But if you actually lay out the
time travel plot in the BTTF series, suddenly it starts
sounding just as complicated as the time travel in Primer. And
when you then try to figure out how
Ever since Episode 6,
The Elements of Time Travel, I've been developing a theory of
how narrative perspective relates to the time travel genres that Dave
is fond of referring to, and how it can either fix or fuck a time
travel narrative. So buckle your seat belts and prepare for a
front-seat roller-coaster ride as I describe the time travel plot of
the BTTF series; what's wrong with it and how it ought to work
(according to how your hosts currently understand time travel
narratives); and how thinking about narrative perspective can help
make everything clearer.
But only after things
get really confusing first. Obviously – spoilers, right?
The Time Travel Plot
of Back to the Future
Marty goes back in time
and alters the past, creating a Fixed (as in “corrected”) Future.
Marty, Doc, and
Jennifer go to the future from the Fixed Future. Future!Future!Biff
uses the machine to go back in time, altering the past and therefore
changing the future. Then he comes back – although weirdly, nothing
has changed yet. There's some kind of delay between changing the past
and the changes taking effect?
The original three time
travellers go back and find the changed world. Marty and Doc go back
in time again, leaving Jennifer in the Alternate Future. They end up
in the most recently created past, the one that causes the Fixed
Future. Except that F!F!Biff has already been to this past, because
it's the past of the timeline that he comes from. (The post-time
travel timeline, that is, at the end of the first movie, which goes:
Altered Past, Fixed Future, Future Future.) So it's not the Original
Altered Past, which we saw in the first movie, but rather the
Alternate Future Past, which is the same as the OAP, but with
F!F!Biff in it.
Marty intervenes and
gets the almanac from F!F!Biff, thereby preventing the Alternate
Future. However, when the Doc goes back to what is now again the
Fixed Future, he leaves Marty stranded in the altered Alternate
Future Past. We are given to understand that the Doc ends up in the
Wild West and leaves a letter to be delivered to Marty right after he
disappears.
Marty (actually Marty
2) enlists the help of 1955!Doc (who just sent Marty 1 back to the
future) to send him to where 1985!Doc is, in the Wild West. Stuff
happens in the Wild West with no relevance to time travel, and Marty
2 makes it back to Fixed Future, where he finds Jennifer on the porch
where he left her in Alternate Future. Does that seem wrong? Hold
that thought.
The timeline is now:
Altered Past with Doubly!Thwarted!Biff, Fixed Future – and Future
Future. Jennifer has a document from Future Future showing the bad
things that we know will happen to Marty as the result of a character
flaw. However, based on his experience in the Wild West, he's able to
overcome that flaw – and the document changes (in accordance with
the rules of this movie). So the final timeline is: Altered Past with
Doubly!Thwarted!Biff, Fixed Future, and Fixed Future Future.
Here Come the
Problems
How can
Future!Future!Biff travel to 1955 then back to the Future Future? In
perfectly consistent time travel, from the perspective of Marty and
Doc, Biff would disappear forever from their timeline when he went
back to 1955 – and they'd also be stranded in the Future Future,
because he would have the machine. If we followed Biff's perspective,
on the other hand, he would travel back to an Alternate Future Future
that follows from the alternate 1985 we saw. And once he's created
the Alternate Future,
Marty 1 doesn't time
travel in the first place (1985!Doc of this timeline is in an insane
asylum), so no Biff would have any reason to worry about Marty 2
coming after him: Marty 2 doesn't exist in this universe.
Imagine, on the other
hand, that the Doc builds another time machine so they can go back to
1955 and stop Biff from giving himself the almanac. Now, that doesn't
make sense, does it? As soon as Biff has time travelled, he's given
himself the almanac: there's no time delay. They should now be in an
alternate reality. Except in an alternate reality, they'd be
different people or may not even exist. By the movies' logic, maybe
their bodies would start disappearing and text would start altering
around them.
By strict
multiple-timelines logic, on the other hand – F!F!Biff has started
his own AU and disappeared permanently from theirs. When they get in
the new time machine and go back to 1985, then, it will still be the
Fixed Future.
As long as we follow
the perspective of one time traveller (or more if they use the same
machine at the same time), everything works. When Marty 2 returns to
1985 from his original trip to 1955, he's actually in a new timeline
to which he's not native – Marty 1 is. So if he intervened and
somehow stopped Marty 1 from going into the past – there would now
be two of them in this new timeline. This is the problem faced by the
protagonist and the scientist in Timecrimes. Or they think it
is – although since that's a loop movie, everything is foreordained
anyway. Whereas the problem when Marty 2 watches AU!Marty 1 get into
the time machine and go back to 1955 is that BTTF briefly
thinks it's a loop movie. In fact, even if this universe's Marty 1
somehow did go back in time at the same moment, in the same way –
he would not have been motivated to fix things in 1955, because he
already grew up with the fixed family. Which is fine, because he
didn't fix his family – Marty 2 did.
Remember: one
perspective=one timeline. Marty grew up with the original family.
Marty travels into the past – where he meets earlier new-timeline
versions of that family that are identical to the original-timeline
versions – unless he changes things. Marty (the same Marty, the one
we're following!) then goes into the future, where he meets identical
new-timeline versions of the family he's altered. If they have a son,
and that son is “him,” that son grew up with them, not the
original timeline family.
The perspective problem
is illustrated again by the events at the end of BTTF 2. When
Doc is zapped back to 1885, from his perspective, he arrives
in the Wild West, prepares the letter for Marty, and dies. You could
film this as consistent time travel by showing him arriving in 1885,
then doing a “70 Years Later” ellipsis, where we see Marty
watching him disappear and then getting the letter a moment later. Of
course that would ruin the pretty awesome timey-wimey, mindy-bendy
surprise of how Marty gets the letter, which depends on being limited
to his perspective. But the fact is that perspective interruptus
occurs throughout the movie.
Perspective and the
Two Kinds of Time Travel
In
alternate-universe/multiple-timeline time travel, your time-travel is
paradox-free because every act of time travel creates a new timeline.
That timeline is identical to the one you just left – until you
change something. So, at 40 you could travel back to when you're 20
years old. If you never do anything to affect the life of Me 1, Me 1
will grow up to be you and “become” you by time travelling –
but “you” in a different timeline. If, on the other hand, you
give yourself some stock market tips and then travel back to the
future, there will be two versions of you: Me 1, who is rich, and
you.
The only thing that's
consistent in all of this is you. You keep creating different
timelines, and everyone around you is from these alternate timelines,
but you are the same self, from the original timeline. Movies start
running into trouble with this when there are multiple time
travellers and the filmmakers think they can adopt the
multiple-character/omniscient perspective of an ordinary movie.
Because
multiple-timeline time travel gets enormously confusing, and movies
seem to have a haphazard approach to it, I don't think we've seen any
clean, consistent example of it, although both Butterfly Effect
and the BTTF movies partake of it. Primer might be the
cleanest example we've seen, although that didn't make it any
clearer.
In
“loop”/single-timeline time travel (major examples we've seen:
Somewhere in Time, Time Traveller's Wife, Timecrimes),
your time travel is paradox-free because everything has already
happened the same way. For this, see Time Traveler's Wife and
Timecrimes. If at 40 you visit your 20-year-old self, you
already have a memory of that visit from the 20-year-old self's
perspective. You can't visit your past self bringing new information,
because the visit already occurred and you already have all of the
information from it.
Although in this type
of time travel you have memories of your visits from the earlier
self's perspective, what you don't have are
memories of people whom you will encounter in your future and
their past – when in the future you travel into the past and
meet them for the first time from their perspective. They
remember your future; and when you do travel back in time, you
experience their past.
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