Marty McFly and Doc Brown zip forward in the time-travelling plutonium-powered DeLorean to the year 2015 to help the McFly family, but when they return home to 1975 they find things have gone horribly pear-shaped, and Marty must once more return to 1955 to put things right.
Review:
A confusing sequel to the 1985 smash that perhaps has too much time-travelling for its own good, and suffers from a cliff-hanging sequel; still the special effects are fine and there's a chance to see Michael J Fox dragging up.