Michael J. Fox had already earned his popularity before the release of Back to the Future. Very few people know that he actually had to turn down the offer for his role in this movie because he was already engaged in shooting another film. The filmmakers then offered another actor the part, but had to freeze the shooting and wait until Michael was free, because he fit the role the best.
After Back to the Future, Michael took part in many other movies like Doc Hollywood, For Love or Money, and Mars Attacks! However, at the age of 30, the actor was diagnosed with Parkinson’s disease. Fortunately, with the help of doctors, he’s managed to stay in good shape, mentally and physically. He even founded “The Michael J. Fox Foundation for Parkinson’s Research.”