Jules taunts his brother Verne by saying that Verne must not be a biological member of the Brown family because he isn't as smart as Doc and Jules, doesn't resemble either parent, and does not have a baby picture. Verne uses his father's photo invention to find a picture of himself, and erroneously concludes that Benjamin Franklin is his biological father. Taking the DeLorean back in time to September 2, 1752, Verne interferes with Franklin's experiment and the discovery of the nature of electricity. When all of the electricity goes out in present day Hill Valley, Doc concludes that all electrical devices will be erased from existence if the timeline cannot be repaired. In Philadelphia, Doc saves Verne from falling off a clock tower. Verne realizes that Doc is his biological father. Doc ad