John Chard
You gotta go forward to save the past and back to alter the future.
Yikes!
Back to the Future Part II sees Marty & Jennifer coerced by Doc into travelling forward in time to correct the future. But Biff is still around and spies an opportunity for untold riches; which he takes. Meaning our three time travelling wonders have to find a way back to the past to stop Biff from changing the course of history.
The gargantuan, and deserved, success of Back To The Future ensured {demanded} that a sequel would follow. So taking the bull by the horns, Robert Zemeckis and Bob Gray crafted not only a sequel, but a trilogy, of which part two is ultimately a sort of interim plot filler for the finale to come a year later. There's no doubt about i...