Back to the Future reigns as one of the most famous film franchises in history. The year 1985 has become a staple in pop culture (even a song by SR-71 is titled after the year), and one of the most iconic figures from that era is Marty McFly: a high school student who travels to the future, then the past, in all three movies. Though the world knows Michael J. Fox brought the character to life, some don’t realize that the role was initially given to Eric Stoltz , whom Michael replaced weeks after production had already begun.

Now that Michael has released his book, Future Boy, which details his hectic schedule balancing Back to the Future and Family Ties , the Parkinson’s Disease advocate revealed what actually happened when he replaced Eric.

Here, Hollywood Life has the

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