Back to the Future director Robert Zemeckis and cowriter Bob Gale have gone on the record saying there won't be any kind of reboot or sequel as long as they're alive. 

But what about a prequel?

We don't know much about the years between Doc Brown's (Christopher Lloyd) discovery of the flux capacitor in 1955 and the 1985 events that led to Marty traveling back in time to 1955. What was Brown up to for all those years? This fan-made trailer [via Slashfilm] for a Back to the Future prequel reveals that much of it was spent gathering up enough plutonium to reach 1.21 gigawatts.

And it wasn't easy. This trailer makes it seem like Doc Brown is the star of his own Bourne movie. How will he "Great Scott!" his way out of this one? 

Check it out.

The trailer was created by Tyler Hopkins, and it uses footage from a ton of other movies (many starring a younger Christopher Lloyd) to piece together what appears to be a gritty thriller about a crazy scientist who gets in way over his head in his attempts to make time travel a reality. 

If you ever wanted to know the origins behind the lines, "They found me. I don't know how but they found me!" then here you go. 

Here's a question: If you could choose between a sequel, a reboot or a prequel for Back to the Future, which would you rather see and why?