Is a pity that after 30 years they haven't realized the great mistake as McFly and Doc worked so hard in the second film ... Biff stole McFly, s book on sports statistics and they come to 1985 where everything is completely anarcy and biff is the king of the town ..... They realize what has happened and have to go to 1955 to fix the alternete timeline that have been created .... But they do not realize that they are alredy in an alternate timeline from the end of the first movie when McFly, s dad stood up to biff and beet him up and now biff is the coward instead . Back to the future is a cool series but to bad that they didn't se that blunder but i guess that will never be fixed...
Review of Back in Time
