Emmett Brown

Dr. Emmett Brown is the deuteragonist of the Back To The Future franchise. He was portrayed by Christopher Lloyd.

Biography
Dr. Brown is a mad scientist, with rather eccentric and dramatic manners, but also a very kind person. He invented the flux capacitor, that makes time travel possible, and built a time machine out of a DeLorean car. Despite its ingenuity, his invention caused many problems and often changed the History of Hill Valley, the films'setting.

Dr. Brown is the best friend of Marty McFly (who calls him "Doc") whom he took to many adventures by accident, and despite their completly opposed personalities, they make a great time-travelling team.