Emmett Lathrop "Doc" Brown, Ph.D., is a fictional character in the "Back to the Future" trilogy in which he is the inventor of the first time machine he built out of a DeLorean sports car. The character is portrayed by Christopher Lloyd in all three films, as well as in the live action sequences of the animated series.

Emmett refers to himself as "a student of all sciences" and is depicted as a passionate inventor. His homes in 1985, 1955, and 1885 are shown to contain various labor-saving gadgets.He appears to be heavily influenced by scientists of previous eras, naming successive pet dogs Copernicus and Einstein, and having portraits of Isaac Newton, Benjamin Franklin, Thomas Edison and Albert Einstein in his laboratory. His favorite author is Jules Verne and his family name was originally "von Braun" before World War I.

Doc recharges the DeLorean with more plutonium and gets Marty to record his send-off. He realizes he’s forgotten his luggage, says the same movie line, “who knows if they have cotton underwear in the future? I’m allergic to all synthetics.”

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