I could not imagen anyone eles playing there roles aswell i try to think of people who would be good as diffrent cast members if the cast members in there parts did not do it but i so carnt. Its great Micheal J Fox decided to do it and good on the makers for keep trying to get him. The movies are fantastic and it shows that the crew on the films worked very hard on the movies and it shows. All the bttf cast are FANTASTIC.