Eric Stoltz spent roughly six weeks filming Back to the Future as Marty McFly before Robert Zemeckis and producer Steven Spielberg pulled him from the role and brought in Michael J. Fox, finalizing the switch on January 10, 1985. Zemeckis later called firing Stoltz “the worst experience of my career.” Full footage of his performance has never surfaced publicly, though a handful of silent clips made it onto the film’s 25th-anniversary Blu-ray release.
For six weeks, Marty McFly had a different face. Eric Stoltz spent that stretch on set playing the time traveling teenager, footage that still exists but has almost never been shown to the public. Robert Zemeckis and Bob Gale watched the dailies, felt the comedic timing simply wasn’t landing, and made a call that Zemeckis later described as the hardest of his career. What followed became one of Hollywood’s most brutal recastings, with Steven Spielberg pushing for the switch and Michael J. Fox stepping in to finish the film everyone now remembers.
A promising start for Eric Stoltz
In late 1984, Eric Stoltz was Marty McFly. Universal executive Sid Sheinberg had pushed for him after Robert Zemeckis and Bob Gale’s first choice, Michael J. Fox, proved unavailable because of his commitment to the sitcom Family Ties. Stoltz threw himself into the part with a method approach, reportedly insisting on being addressed only as Marty on set, a habit that created friction with cast and crew from the start.
Performance clashed with the tone
After roughly six weeks of footage, Zemeckis and Gale reviewed the dailies with their producers and reached an uncomfortable conclusion: Stoltz’s performance leaned too dramatic for a script built on comedic timing. Steven Spielberg, producing the film, went further and warned that the production risked cancellation if they stayed the course. Sheinberg had already assured Zemeckis that the movie could be reshot with someone else if Stoltz didn’t work out, and that safety net made the unthinkable possible.
The decision to recast with Michael J. Fox
Fox had become available again, and the deal to replace Stoltz became official on January 10, 1985. Zemeckis broke the news to a devastated Stoltz himself, later calling the firing “the worst experience of my career” in an interview with George Stroumboulopoulos on CBC. He described the meeting as the hardest he ever had, saying he felt he had broken the actor’s heart. When the rest of the company learned Fox was stepping in, the announcement was greeted internally as good news, and filming resumed with the Family Ties star pulling double duty between the sitcom and the movie.
The footage Hollywood keeps under wraps
Stoltz wasn’t the only casualty of the shake-up. Melora Hardin, cast as Marty’s girlfriend Jennifer opposite Stoltz, was let go around the same time and later said she burst into tears at the news. As for the six weeks Stoltz spent in the DeLorean, the full footage has never been publicly released. Several photographs and a couple of brief dialogue-free clips have surfaced over the decades, but that is all fans have to judge the road not taken. The most substantial glimpse remains the silent excerpts included on a special-edition home video package released in 2010.