This time, Marty ( Michael J. Fox ) and the professor , Doc ( Christopher Lloyd ) go into the future in 2015 to align the future McFly family . But upon his return to the Hill Valley in 1985 they found that everything had changed . Apparently when they are in the future , the enemy Marty , Biff Tannen , find sports books purchased Marty and used to achieve large gains in sports gambling where it is then screwed Hill Valley . To fix everything , Marty and Doc have to go back to the past in 1955 .
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