Why Back To The Future Part II Made Christopher Lloyd's Doc Brown Younger

Back to the Future Part IIdecided to take a few years off of Doc Brown, and there's actually an interesting reason behind the choice. After the smash-hit success of 1985's Back to the Future, the sequel followed a few years later and finds Doc and Marty traveling to the distant year of 2015 to save his future son, only to cause ripples in the timeline that they have to travel back in time to fix. Unlike the straightforward plot of the original, BTTF Part II utilized the full possibilities of time travel for a sprawling story across generations.