According to David Gale, the screenwriter for Back to the Future II, the bully character Biff Tannen, who is Marty McFly’s nemesis in time, is based on none other than Donald Trump. He recounts the development of the story line in an interview with Ben Collins and the Daily Beast.
Of course, it is no small irony that the film travels to today, October 21, 2015, where Trump is running for President.