Michael J. Fox has revealed that his casting in Back to the Future cost his co-star their role. The Zootopia 2 actor famously replaced Eric Stoltz in the lead role of the sci-fi classic after weeks of filming, during which he split his time between the film and his TV show, Family Ties. However, it seems the recasting of Marty McFly in the time-travel comedy also led to the recasting of his girlfriend, Jennifer.

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