Back to the Future Part II
Back to the Future Part II wasn't really supposed to exist as its own film. The original Back to the Future's "TO BE CONTINUED" tag was actually a post-hoc addition for home video, not a plan, after studio head Sid Sheinberg demanded a sequel. The pitch that eventually became two movies went from Bob Gale and Robert Zemeckis, through Spielberg, to Sid Sheinberg, who greenlit the whole thing on the spot.
From the film's vision of the future 2015, to its pre-CGI ingenuity, and a purpose-built motion-control rig called the VistaGlide that let Michael J. Fox play multiple characters in the same…
The skinny
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