Hard to believe that Back to the Future just turned 40 years old. Robert Zemeckis and Bob Gale’s iconic time-travel Amblin film starring Michael J. Fox and Christopher Lloyd introduced the world to a beloved duo, and it’s really hard to imagine anyone else in the roles of Marty McFly and Doc Brown . But as the lore goes, Fox was not originally Marty; he notoriously took over the role from Eric Stoltz, who was just not working out in the role opposite Zemeckis’s ensemble.

In an exclusive clip that Universal Home Entertainment has shared with io9, writer Bob Gale talked about the first night Michael J. Fox took over the role and how it immediately changed the vibe of the shoot for the better.

“The first movie, my absolute favorite moment, there’s no question about it, was the fir

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