Marty and Doc have barely recovered from their first time-travelling adventure when they launch themselves once more into the space-time continuum. But their attempt to fine-tune the future in the year 2015 creates an outlandish, alternate 1985 Hill Valley where Biff Tannen is rich, powerful and Marty’s dad! Now, their only chance to fix the present is by going back to 1955 all over again.
