Question: who plays the doc in back to the future?
Answer: Christopher Allen Lloyd

Christopher Allen Lloyd ( born October 22 , 1938 ) is an American actor , voice actor , and comedian . He is best known for his roles as Emmett '' Doc '' Brown in the Back to the Future trilogy , Judge Doom in Who Framed Roger Rabbit ( 1988 ) , Merlock the Magician in DuckTales the Movie : Treasure of the Lost Lamp ( 1990 ) , Uncle Fester in The Addams Family ( 1991 ) and its sequel Addams Family Values ( 1993 ) , and Grigori Rasputin in Anastasia ( 1997 ) .