5. Back to the Future Part 2 - Why Biff Came Back (or forward?) To The Normal 2015
You gotta love this film, it's a great sequel to an already great movie. It raised the stakes and expanded the universe in which the movie is set. Speaking of which, you might remember that in the second film, future Biff Tannen, after acquiring the sports almanac, he traveled back in time to 1955 and gave himself the sports almanac, which allowed him to become rich and corrupt. However, if you remember Doc Brown's theory of parallel timelines, he shouldn't have been able to return to the normal 2015, in fact he should have come back to the new 2015, in which he had a lot of power. So why he came back to the original 2015? The Reasonable Explanation... This question can be answered with a deleted scene of the film, you can watch it below but, in case you can't see it or you can't understand it, I'll explain it to you. Basically Biff succeeded in his plan,. However, much like the first film, time changes aren't instantaneous. So what happens? He starts to disappear, just like Marty did on the first movie. And once the timeline finally changed, he was completely erased from existence. https://www.youtube.com/watch?v=u2NBw-ZSQ98