Did you ever wonder about this? How Did Back To The Future's Marty And Doc Brown Meet?

It's not always necessary to question how some great on-screen teams first came together. With movies like The Goonies or Bill and Ted's Excellent Adventure,
a combination of shared interests and school and/or the proximity of
their homes is likely to explain the start of their friendship. The real
story is in the adventure. Knowing how they met seems far less
important as appreciating that their friendship led to something really
great happening. That certainly applies to Marty McFly and Doc Brown,
which is why I wouldn't exactly consider their origin story to be one of
the great movie mysteries of all time. But given their age difference,
and the fact that they don't seem to have any friends or family members
in common (not counting Einstein), it's fair to wonder how these two
people found each other. What's a high school slacker doing hanging out
with a weird scientist, anyway?



MentalFloss.com put that question out into the universe and the universe answered back. Or Back to the Future
co-writer/co-creator Bob Gale did, anyway. Here's what the writer had
to say about what he and Robert Zemeckis came up with to explain how
Marty and Doc got together…

Okay, from the horse’s mouth (yes, I’m the horse — er, co-writer,
co-creator): We never explained it in the movie. But the history of the
characters that Bob Zemeckis and I created is this…


For years, Marty was told that Doc Brown was dangerous, a crackpot, a
lunatic. So, being a red-blooded American teenage boy, age 13 or 14, he
decided to find out just why this guy was so dangerous. Marty snuck into
Doc’s lab, and was fascinated by all the cool stuff that was there.
when Doc found him there, he was delighted to find that Marty thought he
was cool and accepted him for what he was. Both of them were the black
sheep in their respective environments. Doc gave Marty a part-time job
to help with experiments, tend to the lab, tend to the dog, etc.


And that’s the origin of their relationship.

— Bob Gale

Going under the assumption that this is legit (and there doesn't seem to
be any reason to believe otherwise), it's a pretty great piece of BTTF
trivia, especially when you factor in the pre-established bond between
Doc and Marty at the beginning first movie. The film starts with Marty
showing up at Doc's lab to mess around with this speaker equipment. He
lets himself in like he's been there a million times, which in itself
suggests a close relationship with the Doc. But what I really like about
this explanation is that it's consistent with their characters. Marty
meeting Doc sounds like it was due to an act of rebellion, rather than
an interest in science. The connection was made. Lightning